PSXP Phillips 66 Partners LP

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 14C

(RULE 14c-101)

SCHEDULE 14C INFORMATION

Information Statement Pursuant to Section 14(c) of the

Securities Exchange Act of 1934

Phillips 66 Partners LP

(Name of Registrant as Specified in its Charter)

On October 26, 2021, Phillips 66, a Delaware corporation (“Phillips 66”), Phillips 66 Company, a Delaware corporation and a wholly owned subsidiary of Phillips 66 (“P66 Company”), Phillips 66 Project Development Inc., a Delaware corporation and a wholly owned subsidiary of P66 Company (“P66 PDI”), Phoenix Sub LLC, a Delaware limited liability company and jointly owned subsidiary of P66 Company and P66 PDI (“Merger Sub”), Phillips 66 Partners LP, a Delaware limited partnership (“PSXP”), and Phillips 66 Partners GP LLC, a Delaware limited liability company and the general partner of PSXP (the “General Partner”), entered into an Agreement and Plan of Merger (the “Merger Agreement”), pursuant to which Merger Sub will merge with and into PSXP, with PSXP surviving as an indirect, wholly owned subsidiary of Phillips 66 (the “Merger”).

Pursuant to the Merger Agreement, (i) each common unit representing limited partner interests in PSXP (“PSXP Common Units”) outstanding immediately prior to the effective time of the Merger (the “Effective Time”), other than PSXP Common Units held directly or indirectly by Phillips 66 and its subsidiaries (all such PSXP Common Units held by persons other than Phillips 66 and its subsidiaries, the “PSXP Public Common Units,” and the holders of such units, the “PSXP Public Unitholders”), will be converted into the right to receive 0.500 shares (the “Exchange Ratio”) of common stock, par value $0.01 per share, of Phillips 66 (“Phillips 66 Common Stock,” and the shares of Phillips 66 Common Stock to be issued in the Merger, the “Merger Consideration”), (ii) each of the outstanding equity awards relating to a PSXP Common Unit issued under the Partnership Long-Term Incentive Plans (as defined in the Merger Agreement), other than Director LTIP Awards (as defined below) (each, a “Partnership LTIP Award”), whether vested or not vested, will cease to relate to or represent any right to receive a PSXP Common Unit and shall be converted into an award of restricted stock units relating to a number of shares of Phillips 66 Common Stock equal to the number of PSXP Common Units subject to such Partnership LTIP Award multiplied by the Exchange Ratio (rounded up to the nearest whole share) on the same terms and conditions as were applicable to the corresponding Partnership LTIP Award (a “Parent RSU”), including any applicable payment timing provisions and dividend equivalent rights, and (iii) each of the outstanding equity awards held by a non-employee director whose service to PSXP or its affiliates will terminate upon consummation of the Merger (each, a “Director LTIP Award”), will become fully vested and automatically converted into the right to receive, with respect to each PSXP Common Unit subject thereto, the Merger Consideration (or, to the extent set forth under the terms of the applicable Director LTIP Award, cash in an amount equal to the value of the Merger Consideration based on the closing price of a share of Phillips 66 Common Stock as of the closing date of the Merger) plus any accrued but unpaid amounts in relation to distribution equivalent rights. The interests in PSXP owned by Phillips 66 and its subsidiaries will remain outstanding as limited partner interests in the surviving entity. The non-economic general partner interest in PSXP held by the General Partner will continue as a non-economic general partner interest in the surviving entity, and the General Partner will continue as the sole general partner of the surviving entity. No fractional shares of Phillips 66 Common Stock will be issued in the Merger; instead, all fractional shares of Phillips 66 Common Stock to which a PSXP Public Unitholder otherwise would have been entitled will be aggregated and the resulting fraction of a share of Phillips 66 Common Stock will be rounded up to three decimal places. Any PSXP Public Unitholder otherwise entitled to receive a fractional share of Phillips 66 Common Stock shall be entitled to receive a cash payment, without interest, rounded to the nearest cent, equal to the product of (i) the aggregated amount of such fractional interest and (ii) an amount equal to the average of the volume-weighted average price per share of Phillips 66 Common Stock on the New York Stock Exchange (“NYSE”) on each of the ten (10) consecutive trading days ending with the complete trading day immediately prior to the completion of the Merger. Existing stockholders of Phillips 66 (the “Phillips 66 Stockholders”) will continue to own their existing Phillips 66 Common Stock following completion of the Merger.

On October 26, 2021, the conflicts committee (the “Conflicts Committee”) of the board of directors of the General Partner (the “GP Board”), by unanimous vote (a) determined that the Merger, including the Merger Agreement and the transactions contemplated thereby, are in the best interests of PSXP and its subsidiaries and the PSXP Public Unitholders, (b) approved the Merger, including the Merger Agreement and the transactions contemplated thereby (the foregoing constituting “Special Approval” as defined in the Third Amended and Restated Agreement of Limited Partnership of PSXP, dated August 1, 2019 (as amended, the “Third A&R Partnership Agreement”)), (c) recommended to the GP Board the approval of the Merger Agreement and the execution, delivery and performance of the Merger Agreement and the transactions contemplated thereby, including the Merger, and (d) resolved, and recommended to the GP Board that the GP Board resolve, to direct that the Merger Agreement be submitted to a vote of the limited partners of PSXP (“PSXP Limited Partners”).

On October 26, 2021, the GP Board (acting, in part, based upon the receipt of such approval and recommendation of the Conflicts Committee), by unanimous vote (a) determined that the Merger Agreement and the transactions contemplated thereby, including the Merger, are in the best interests of PSXP and the PSXP Limited Partners, (b) authorized and approved the execution, delivery and performance of the Merger Agreement and the transactions contemplated thereby, including the Merger, (c) directed that the Merger Agreement be submitted to a vote of the PSXP Limited Partners and (d) authorized the PSXP Limited Partners to act by written consent pursuant to the terms of the Third A&R Partnership Agreement.

Pursuant to the Third A&R Partnership Agreement, the approval of the Merger Agreement and the Merger by PSXP requires the affirmative vote or written consent of a majority of the outstanding PSXP Common Units and Series A Preferred Units (on an as-converted basis at the then applicable conversion rate), voting together as a single class (a “Unit Majority”). On October 26, 2021, Phillips 66 caused P66 PDI, which, as of such date, beneficially owned 169,760,137 PSXP Common Units, representing approximately 70.21% of the outstanding PSXP Common Units and Series A Preferred Units (as defined in the accompanying information statement/prospectus) on an as-converted basis and constituting a Unit Majority, to deliver a written consent (the “Written Consent”) approving the Merger Agreement and the transactions contemplated thereby, including the Merger. Accordingly, the delivery of the Written Consent is sufficient to approve the Merger Agreement and the transactions contemplated thereby, including the Merger, on behalf of the PSXP Limited Partners.

This information statement/prospectus provides you with detailed information about the proposed Merger and related matters. Phillips 66 and PSXP both encourage you to read the entire document carefully. In particular, see the section titled “Risk Factors” beginning on page 12 for a discussion of risks related to the Merger, the tax consequences of the Merger and ownership of the Phillips 66 Common Stock received in the Merger, an investment in Phillips 66 Common Stock, and Phillips 66’s business following the consummation of the Merger.

Phillips 66 Common Stock is listed on the NYSE under the symbol “PSX,” and PSXP Common Units are listed on the NYSE under the symbol “PSXP.”

Chairman of the Board of Directors and Chief Executive Officer of

Phillips 66 and Phillips 66 Partners GP LLC

NEITHER THE SECURITIES AND EXCHANGE COMMISSION (“SEC”) NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED OF THE SECURITIES TO BE ISSUED IN CONNECTION WITH THE MERGER OR DETERMINED THAT THIS INFORMATION STATEMENT/PROSPECTUS IS ACCURATE OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

This information statement/prospectus is dated February 2, 2022 and is first being mailed to PSXP Limited Partners on or about February 2, 2022.

2331 CityWest Boulevard

Houston, Texas 77042

information statement/prospectus) on an as-converted basis and constituting a Unit Majority, to deliver a written consent (the “Written Consent”) approving the Merger Agreement and the transactions contemplated thereby, including the Merger. Accordingly, the delivery of the Written Consent was sufficient to approve the Merger Agreement and the transactions contemplated thereby, including the Merger, on behalf of the PSXP Limited Partners. For this reason, this information statement/prospectus is being provided to you for informational purposes only. PSXP has not solicited and is not soliciting your adoption and approval of the Merger Agreement.

The accompanying information statement/prospectus describes the Merger Agreement, the Merger, and the actions to be taken in connection with the Merger, as well as provides additional information about the parties involved. Please give this information your careful attention. A copy of the Merger Agreement is attached as Annex A to the accompanying information statement/prospectus.

By order of the Board of Directors of Phillips 66 Partners GP LLC

Greg C. Garland

Chairman of the Board of Directors and Chief Executive Officer of Phillips 66 Partners GP LLC

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IMPORTANT NOTE ABOUT THIS INFORMATION STATEMENT/PROSPECTUS

This information statement/prospectus incorporates by reference important business and financial information about Phillips 66 and PSXP and their respective subsidiaries from documents filed with the Securities and Exchange Commission (“SEC”) that have not been included in or delivered with this information statement/prospectus. This information is available without charge at the SEC’s website at www.sec.gov. You may also obtain certain of these documents at Phillips 66’s website, www.phillips66.com, and PSXP’s website, www.phillips66partners.com. Information contained on the websites of Phillips 66 and PSXP does not constitute part of this information statement/prospectus. See “Where You Can Find More Information.”

You may also request copies of publicly filed documents from Phillips 66 without charge by requesting them in writing or by telephone at the following address and telephone number:

Phillips 66

2331 CityWest Boulevard

Houston, Texas 77042

Telephone: (281) 293-6600

You may also request copies of publicly filed documents from PSXP without charge by requesting them in writing or by telephone at the following address and telephone number:

Phillips 66 Partners LP

2331 CityWest Boulevard

Houston, Texas 77042

Telephone: (855) 283-9237

If you request any such documents, Phillips 66 or PSXP will mail them to you by first class mail, or another equally prompt means, after receipt of your request. To receive timely delivery of the documents, your request must be received no later than February 21, 2022.

The sections entitled “Questions and Answers” and “Summary” below highlight selected information from this information statement/prospectus, but they do not include all of the information that may be important to you. To better understand the Merger Agreement and the Merger, and for a more complete description of legal terms thereof, you should carefully read this entire information statement/prospectus, including the section entitled “Risk Factors” and the Merger Agreement, a copy of which is attached as Annex A hereto, as well as the documents that are incorporated by reference into this information statement/prospectus. See “Where You Can Find More Information.”

No one has been authorized to provide you with information that is different from that contained in, or incorporated by reference into, this information statement/prospectus. You should not assume that the information contained in, or incorporated by reference into, this information statement/prospectus is accurate as of any date other than, in the case of this information statement/prospectus, the date on the front cover of this information statement/prospectus and, in the case of information incorporated by reference, the respective dates of such referenced documents. Neither the mailing of this information statement/prospectus to PSXP Limited Partners nor the issuance by Phillips 66 of shares of Phillips 66 Common Stock as Merger Consideration in connection with the Merger will create any implication to the contrary.

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QUESTIONS AND ANSWERS

The following questions and answers are intended to briefly address some questions that you may have regarding the Merger and the Merger Agreement. We urge you to carefully read the remainder of this information statement/prospectus because these questions and answers may not address all questions or provide all information that might be important to you with respect to the Merger and the Merger Agreement. Additional important information is also contained in the annexes and the documents incorporated by reference into this information statement/prospectus. You may obtain the information incorporated by reference into this information statement/prospectus without charge by following the instructions under “Where You Can Find More Information.”

This Exchange Ratio is fixed and will not be adjusted to reflect changes in the stock price or unit price of either company before the merger is complete. The Exchange Ratio will, however, be adjusted appropriately to fully reflect the effect of any reclassification, recapitalization, stock split or combination, exchange or readjustment of shares or units, or any stock or unit dividend thereon, with respect to outstanding shares of capital stock or units of either Phillips 66 or PSXP, respectively, with a record date between the date of the Merger Agreement and the date on which the closing of the Merger (the “Closing”) occurred (the “Closing Date”). No fractional shares of Phillips 66 Common Stock will be issued in the Merger. Instead of receiving any fractions of a share of Phillips 66 Common Stock, all fractions of shares of Phillips 66 Common Stock to which a PSXP Public Unitholder would otherwise have been entitled will be aggregated and rounded to three decimal places. Any PSXP Public Unitholder otherwise entitled to receive a fractional share of Phillips 66 Common Stock shall be entitled to receive a cash payment, without interest, rounded to the nearest cent, equal to the product of (i) the aggregated amount of such fractional interest and (ii) an amount equal to the average of the volume-weighted average price per share of Phillips 66 Common Stock on the NYSE on each of the ten (10) consecutive trading days ending with the complete trading day immediately prior to the completion of the Merger. See “The Merger Agreement—The Merger; Effective Time; Closing.”

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Phillips 66 Partners LP

Phillips 66 Partners GP LLC

2331 CityWest Blvd.

Houston, Texas 77042

Telephone: (855) 283-9237

Attention: Corporate Secretary

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COMPARATIVE MARKET PRICES AND CASH DIVIDEND/DISTRIBUTION INFORMATION

Shares of Phillips 66 Common Stock are listed on the NYSE under the symbol “PSX” and PSXP Common Units are listed on the NYSE under the symbol “PSXP.” The following table presents the closing prices of Phillips 66 Common Stock and PSXP Common Units on (i) October 26, 2021, the last trading day before the public announcement of the Merger, and (ii) January 18, 2022, the most recent practicable trading day before the date of this information statement/prospectus. The table also shows the equivalent per unit value of the Phillips 66 Common Stock included in the Merger Consideration for each PSXP Common Unit, which per unit value is calculated as the product of (i) the applicable Phillips 66 per share value, and (ii) 0.500, the Exchange Ratio, rounded to the nearest cent.

The above table shows only a historical comparison. This comparison may not provide meaningful information to PSXP Limited Partners in connection with making any decisions with respect to the Merger. PSXP Limited Partners are urged to obtain current market quotations for shares of Phillips 66 Common Stock and PSXP Common Units and to review carefully the other information contained in this information statement/prospectus or incorporated herein by reference in making any decisions with respect to the Merger. See “Where You Can Find More Information” for instructions on how to obtain the information that has been incorporated by reference. Historical performance is not necessarily indicative of any performance to be expected in the future. See “Risk Factors” and “Cautionary Statement Regarding Forward-Looking Statements.”

Dividend and Share Data—Phillips 66

The declaration and payment of dividends by Phillips 66 is subject to the discretion of the Phillips 66 Board, and no assurance can be given that Phillips 66 will pay dividends in the future. Phillips 66 currently pays a quarterly dividend on shares of Phillips 66 Common Stock and last paid a dividend on December 1, 2021, of $0.92 per share. The determination to pay dividends in the future will depend upon, among other things, general business conditions, Phillips 66’s financial results, contractual and legal restrictions regarding the payment of dividends by Phillips 66, planned investments by Phillips 66, and such other factors as the Phillips 66 Board deems relevant.

As of January 18, 2022, there were approximately 438,413,964 shares of Phillips 66 Common Stock outstanding, and there were approximately 31,763 holders of record of Phillips 66 Common Stock.

Distribution and Unit Data—PSXP

The Third A&R Partnership Agreement provides that within 45 days after the end of each quarter, PSXP will distribute its cash available for distributions, if any, to PSXP Unitholders of record on the applicable record date. As a result of the conversion and cancellation of PSXP Common Units in connection with the Merger, PSXP will no longer make quarterly distributions following the Closing (other than distributions, if any, with a record date between the date of the Merger Agreement and the Closing Date); provided, that PSXP Unitholders will only receive for the quarter in which the Closing occurs either (i) distributions in respect of PSXP Common Units or (ii) dividends in respect of Phillips 66 Common Stock received as Merger Consideration).

As of January 18, 2022 there were approximately 228,340,146 PSXP Common Units outstanding and there were approximately 15 holders of record of PSXP Common Units.

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The Merger Agreement restricts the ability of PSXP to declare, authorize, set aside or pay any distribution payable in cash, equity or property in respect of the PSXP Common Units prior to the consummation of the Merger. Notwithstanding the foregoing, the Merger Agreement provides that PSXP shall declare its regular quarterly cash distributions on the PSXP Common Units in an amount consistent with past practice and not less than $0.875 per PSXP Common Unit for the quarterly period ending December 31, 2021 and for each quarterly period thereafter to the extent Closing does not occur prior to the applicable record date for such quarterly distribution. See “The Merger Agreement—Conduct of Business Prior to Closing.”

Because the Exchange Ratio is fixed and because the market price of shares of Phillips 66 Common Stock will fluctuate prior to the completion of the Merger, PSXP Unitholders cannot be sure of the market value of the shares of Phillips 66 Common Stock they will receive as Merger Consideration relative to the value of PSXP Common Units that they exchange in connection with the Merger. See “Risk Factors.”

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RISK FACTORS

In addition to the other information included or incorporated by reference into this information statement/prospectus, including the matters addressed in “Cautionary Statement Regarding Forward-Looking Statements,” you should carefully consider the following risks relating to the Merger and Phillips 66 Stock Issuance. In addition, you should read and consider the risks associated with each of the businesses of Phillips 66 and PSXP, because these risks may also affect the combined company. A description of the material risks can be found in Part I, Item 1A of Phillips 66’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020 and Part II, Item 1A of Phillips 66’s Quarterly Reports on Form 10-Q for the quarterly periods ended March 31, 2021, June 30, 2021, and September 30, 2021, and in Part I, Item 1A of PSXP’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020 and Part II, Item 1A of PSXP’s Quarterly Reports on Form 10-Q for the quarterly periods ended March 31, 2021, June 30, 2021, and September 30, 2021, each of which are filed with the SEC and incorporated by reference into this information statement/prospectus. See “Where You Can Find More Information.”

Risks Related to the Merger

Because the Exchange Ratio is fixed and because the market price of shares of Phillips 66 Common Stock will fluctuate prior to the completion of the Merger, PSXP Public Unitholders cannot be sure of the market value of shares of Phillips 66 Common Stock that they will receive as Merger Consideration relative to the value of the PSXP Common Units that they will exchange in connection with the Merger.

The market value of the consideration that PSXP Public Unitholders will receive in the Merger will depend on the trading price of shares of Phillips 66 Common Stock at the Closing. Subject to any applicable withholding tax, the Exchange Ratio that determines the number of shares of Phillips 66 Common Stock that PSXP Public Unitholders (including any holders of PSXP Public Common Units that are issued or issuable to any holder of Series A Preferred Units as of the Effective Time pursuant to the Third A&R Partnership Agreement) will receive in the Merger is fixed at 0.500 shares of Phillips 66 Common Stock for each PSXP Public Common Unit they own. This means that there is no mechanism contained in the Merger Agreement that would adjust the number of shares of Phillips 66 Common Stock that PSXP Public Unitholders will receive based on any decreases or increases in the trading price of Phillips 66 Common Stock. Changes in per share or per unit price may result from a variety of factors (many of which are beyond Phillips 66’s and PSXP’s control), including:

If the price of Phillips 66 Common Stock at the Closing is less than the price of Phillips 66 Common Stock on the date that the Merger Agreement was signed, then the market value of the Merger Consideration will be less than contemplated at the time the Merger Agreement was signed.

The Merger is subject to conditions, including some conditions that may not be satisfied on a timely basis, if at all. Failure to complete the Merger, or significant delays in completing the Merger, could negatively affect each party’s future business and financial results and the trading prices of shares of Phillips 66 Common Stock and PSXP Common Units.

The completion of the Merger is subject to certain conditions. The completion of the Merger is not assured and is subject to risks. The Merger Agreement contains conditions, some of which are beyond the parties’ control, that, if not satisfied or waived, may prevent, delay or otherwise result in the Merger not occurring.

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If the Merger is not completed, or if there are significant delays in completing the Merger, Phillips 66’s or PSXP’s future business and financial results and the trading prices of shares of Phillips 66 Common Stock and PSXP Common Units could be negatively affected, and each of the parties will be subject to several risks, including the following:

The date PSXP Public Unitholders will receive the Merger Consideration depends on the Closing Date, which is uncertain.

Completing the Merger is subject to several conditions, not all of which are controllable by Phillips 66 or PSXP. Accordingly, the date on which PSXP Public Unitholders (including holders of any PSXP Public Common Units that are issued or issuable to any holder of Series A Preferred Units as of the Effective Time pursuant to the Third A&R Partnership Agreement) will receive Merger Consideration depends on the Closing Date, which is uncertain and subject to several other closing conditions.

PSXP is currently and, in the future, Phillips 66 and PSXP may be targets of individual or class action securities or derivative lawsuits, which could result in substantial costs and may delay or prevent the Closing.

Securities class action lawsuits and derivative lawsuits are often brought against companies that have entered into merger agreements in an effort to enjoin the relevant merger or seek monetary relief. PSXP is currently a defendant in lawsuits relating to the Merger Agreement and the Merger and, even if the pending or any future lawsuits involving Phillips 66 or PSXP are without merit, defending against these claims can result in substantial costs and divert management time and resources. Phillips 66 and PSXP cannot predict the outcome of these lawsuits, or others, nor can either company predict the amount of time and expense that will be required to resolve such litigation. An unfavorable resolution of any such litigation surrounding the Merger could delay or prevent its consummation. In addition, the costs of defending the litigation, even if resolved in Phillips 66’s or PSXP’s favor, could be substantial, and such litigation could distract Phillips 66 and PSXP from pursuing the consummation of the Merger and other potentially beneficial business opportunities. See “The Merger --Litigation Relating to the Merger.”

Each party is subject to business uncertainties and contractual restrictions while the Merger is pending, which could adversely affect each party’s business and operations.

In connection with the pendency of the Merger, it is possible that some customers, suppliers and other persons with whom Phillips 66 or PSXP has a business relationship may delay or defer certain business decisions

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or might decide to seek to terminate, change or renegotiate their relationships with Phillips 66 or PSXP, as the case may be, as a result of the Merger. Under the terms of the Merger Agreement, each of Phillips 66 and PSXP is subject to certain restrictions on the conduct of its respective business prior to completing the Merger, which may reduce the value of the Phillips 66 Common Stock or the PSXP Public Common Units or adversely affect each party’s ability to acquire assets or to execute certain of its business strategies. Such limitations could adversely affect each party’s businesses and operations prior to the completion of the Merger. See “The Merger Agreement—Covenants and Agreements—Conduct of Business.”

Each of the risks described above may be exacerbated by delays or other adverse developments with respect to the completion of the Merger.

The opinion of the Conflicts Committee’s financial advisor will not reflect changes in circumstances between the signing of the Merger Agreement and the Closing Date.

The Conflicts Committee has received an opinion from its financial advisor in connection with the signing of the Merger Agreement, but has not obtained any updated opinion from its financial advisor as of the date of this information statement/prospectus. Changes in the operations and prospects of Phillips 66 or PSXP, general market and economic conditions and other factors that may be beyond the control of Phillips 66 or PSXP, and on which the Conflicts Committee’s financial advisor’s opinion was based, may significantly alter the value of Phillips 66 or PSXP or the prices of the shares of Phillips 66 Common Stock or PSXP Common Units by the time the Merger is completed. The opinion does not speak as of the time the Merger will be completed or as of any date other than the date of such opinion. Because the Conflicts Committee does not currently anticipate asking its financial advisor to update its opinion, the opinion will not address the fairness of the Merger Consideration from a financial point of view at the time the Merger is completed. For a description of the opinion that the Conflicts Committee received from its financial advisor, see the section entitled “The Merger—Opinion of Evercore—Financial Advisor to the Conflicts Committee.” A copy of the opinion of Evercore Group L.L.C., the Conflicts Committee’s financial advisor, is attached as Annex B to this information statement/prospectus.

The Third A&R Partnership Agreement limits the duties of the General Partner to PSXP Unitholders and restricts the remedies available to PSXP Unitholders for actions taken by the General Partner that might otherwise constitute breaches of its duties.

In light of potential conflicts of interest between Phillips 66 and the General Partner, on the one hand, and PSXP and the PSXP Public Unitholders, on the other hand, the GP Board submitted the Merger and related matters to the Conflicts Committee for, among other things, review, evaluation, negotiation and possible approval of a majority of its members, which is referred to as “Special Approval” in the Third A&R Partnership Agreement and this information statement/prospectus. The duties of the General Partner, the GP Board and the Conflicts Committee to PSXP Limited Partners in connection with the Merger are substantially limited by the Third A&R Partnership Agreement. Under the Third A&R Partnership Agreement:

The Conflicts Committee reviewed, negotiated and evaluated the Merger Agreement and the transactions contemplated thereby, including the Merger, on behalf of PSXP and the PSXP Public Unitholders. Among other things, the Conflicts Committee, by unanimous vote (a) determined that the Merger, including the Merger

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Agreement and the transactions contemplated thereby, are in the best interests of PSXP and its subsidiaries and the PSXP Public Unitholders, (b) approved the Merger, including the Merger Agreement and the transactions contemplated thereby (the foregoing constituting “Special Approval” as defined in the Third A&R Partnership Agreement) and (c) recommended to the GP Board the approval of the Merger Agreement and the execution, delivery and performance of the Merger Agreement and the transactions contemplated thereby, including the Merger, and (d) resolved, and recommended to the GP Board that the GP Board resolve, to direct that the Merger Agreement be submitted to a vote of the PSXP Limited Partners.

Financial forecasts relating to PSXP may not prove to be accurate.

In connection with the Merger, Phillips 66 prepared and considered, among other things, internal financial forecasts for PSXP. These forecasts speak only as of the date made and will not be updated. These financial forecasts were not provided with a view to public disclosure, are subject to significant economic, competitive, industry and other uncertainties, and may not be achieved in full, at all or within projected time frames. In addition, the failure of businesses to achieve projected results could have a material adverse effect on our share price and financial position following the Merger.

Tax Risks Related to the Merger and the Ownership of Phillips 66 Common Stock Received in the Merger

In addition to reading the following risk factors, you are urged to read “Material U.S. Federal Income Tax Consequences” for a more complete discussion of the expected U.S. federal income tax consequences of the Merger and owning and disposing of shares of Phillips 66 Common Stock received in the Merger.

The Merger will be a taxable transaction to PSXP Public Unitholders and, in such case, the resulting tax liability of a PSXP Public Unitholder, if any, will depend on the unitholder’s particular situation. The tax liability of a PSXP Public Unitholder as a result of the Merger could be more than expected.

PSXP Public Unitholders will receive Phillips 66 Common Stock as the Merger Consideration. Although PSXP Public Unitholders will receive no cash consideration (other than cash received in lieu of a fractional share of Phillips 66 Common Stock, if any), the Merger will be treated as a taxable sale by U.S. Holders (as defined in “Material U.S. Federal Income Tax Consequences”) of PSXP Common Units for U.S. federal income tax purposes. In such case, as a result of the Merger, a PSXP Public Unitholder will recognize gain or loss for U.S. federal income tax purposes equal to the difference between such unitholder’s amount realized and the unitholder’s adjusted tax basis in the PSXP Common Units, which will be increased by the U.S. Holder’s share of certain items related to business interest not yet deductible by such U.S. Holder due to applicable limitations on the deductibility of such business interest. The amount of gain or loss recognized by each PSXP Public Unitholder in the Merger will vary depending on each unitholder’s particular situation, including the value of the shares of Phillips 66 Common Stock received by each unitholder in the Merger, the adjusted tax basis in the PSXP Common Units exchanged by each unitholder in the Merger, and the amount of any suspended passive losses that may be available to a particular unitholder to offset all or a portion of the gain recognized by the unitholder.

Because the value of any Phillips 66 Common Stock received in the Merger will not be known until the Effective Time, a PSXP Public Unitholder will not be able to determine its amount realized, and therefore its taxable gain or loss, until such time. In addition, because prior distributions in excess of a PSXP Public Unitholder’s allocable share of PSXP’s net taxable income decrease the unitholder’s tax basis in its common units, the amount, if any, of the prior excess distributions with respect to such PSXP Common Units will, in effect, become taxable income to a unitholder if the aggregate value of the consideration received in the Merger is greater than the unitholder’s adjusted tax basis in its common units, even if the aggregate value of the consideration received in the Merger is less than the unitholder’s original cost basis in its PSXP Public Common Units.

Furthermore, a portion of any gain or loss, which could be substantial, will be separately computed and taxed as ordinary income to the extent attributable to “unrealized receivables,” including depreciation recapture,

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or to “inventory items” owned by PSXP and its subsidiaries. Consequently, a PSXP Public Unitholder may recognize both ordinary income and capital loss upon the exchange of PSXP Common Units in the Merger even if there is a net taxable loss realized on the exchange of such U.S. Holder’s PSXP Common Units pursuant to the Merger. The deductibility of capital losses is subject to limitations.

For a more complete discussion of the U.S. federal income tax consequences of the Merger, see “Material U.S. Federal Income Tax Consequences.”

The U.S. federal income tax treatment of owning and disposing of shares of Phillips 66 Common Stock received in the Merger will be different from the U.S. federal income tax treatment of owning and disposing of PSXP Common Units.

PSXP is classified as a partnership for U.S. federal income tax purposes and, generally, is not subject to entity-level U.S. federal income tax. Instead, each PSXP Unitholder is required to take into account its respective share of PSXP’s items of income, gain, loss and deduction in computing its federal income tax liability, even if no cash distributions are made by PSXP to the unitholder. A pro rata distribution of cash by PSXP to a PSXP Public Unitholder who is a U.S. Holder is generally not taxable for U.S. federal income tax purposes unless the amount of cash distributed is in excess of the PSXP Public Unitholder’s adjusted tax basis in its PSXP Common Units.

In contrast, Phillips 66 is classified as a corporation for U.S. federal income tax purposes and is subject to U.S. federal income tax on its taxable income. A distribution of cash by Phillips 66 to a stockholder who is a U.S. Holder will generally be included in such U.S. Holder’s income as ordinary dividend income to the extent of Phillips 66’s current or accumulated “earnings and profits,” as determined under U.S. federal income tax principles. A portion of the cash distributed to Phillips 66 Stockholders by Phillips 66 after the Merger may exceed Phillips 66’s current and accumulated earnings and profits. Cash distributions to a Phillips 66 Stockholder who is a U.S. Holder in excess of Phillips 66’s current and accumulated earnings and profits will be treated as a non-taxable return of capital, reducing the U.S. Holder’s adjusted tax basis in the holder’s Phillips 66 Common Stock and, to the extent the cash distribution exceeds the holder’s adjusted tax basis, as capital gain from the sale or exchange of such Phillips 66 Common Stock. See “Material U.S. Federal Income Tax Consequences.”

Risks Inherent in an Investment in Phillips 66

PSXP Unitholders will be entitled to different rights as holders of shares of Phillips 66 Common Stock than those to which they are entitled as holders of PSXP Common Units.

Following completion of the Merger, PSXP Public Unitholders will no longer hold PSXP Common Units, but will instead hold shares of Phillips 66 Common Stock. Phillips 66 is a Delaware corporation, and PSXP is a Delaware limited partnership. There are important differences between the rights of PSXP Unitholders and the rights of Phillips 66 Stockholders. See “Comparison of Rights of Phillips 66 Stockholders and PSXP Unitholders.”

The market value of Phillips 66 Common Stock could decline if large amounts of such common stock are sold following the Merger and the market value of Phillips 66 Common Stock could also decline as a result of issuances and sales of shares of Phillips 66 Common Stock other than in connection with the Merger.

Following completion of the Merger, PSXP Public Unitholders will no longer hold PSXP Common Units, and will own interests in a combined company operating an expanded business with more assets and a different mix of liabilities. Current Phillips 66 Stockholders and former PSXP Public Unitholders may not wish to continue to invest in the combined company, or may wish to reduce their investment in the combined company, in order to comply with institutional investing guidelines, to increase diversification or to track any rebalancing of stock indices in which Phillips 66 Common Stock or PSXP Common Units are or were included. If, following the completion of the Merger, large amounts of Phillips 66 Common Stock are sold, the price of Phillips 66 Common Stock could decline.

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Furthermore, Phillips 66 cannot predict the effect that issuances and sales of Phillips 66 Common Stock, whether taking place before completion of Merger (subject to the limitations of the Merger Agreement) or after completion of the Merger, including issuances and sales in connection with capital markets transactions, acquisition transactions or other transactions, may have on the market value of Phillips 66 Common Stock. The issuance and sale of substantial amounts of Phillips 66 Common Stock could adversely affect the market value of such common stock.

Phillips 66 may not achieve the intended benefits of the Merger, and the Merger may disrupt its current plans or operations.

There can be no assurance that Phillips 66 will be able to realize the expected benefits of the potential transaction (including related synergies). The integration of the two companies may result in material challenges, including the diversion of management’s attention from ongoing business concerns; retaining or attracting business and operational relationships; the possibility of faulty assumptions underlying expectations regarding the integration process and associated expenses; consolidating corporate and administrative infrastructures and eliminating duplicative operations; as well as potential unknown liabilities, unforeseen expenses relating to integration, or delays associated with the acquisition.

Risks Relating to Phillips 66’s Business

Continuing political and social concerns about the issues of climate change may result in changes to our business and significant expenditures, including litigation-related expenses.

Increasing attention to global climate change has resulted in increased investor attention and an increased risk of public and private litigation, which could increase our costs or otherwise adversely affect our business. For example, shareholder activism has recently been increasing in our industry, and shareholders may attempt to effect changes to our business or governance, whether by shareholder proposals, public campaigns, proxy solicitations or otherwise. Additionally, cities, counties, and other governmental entities in several states in the U.S. began filing lawsuits against energy companies in 2017, including Phillips 66. The lawsuits seek damages allegedly associated with climate change, and the plaintiffs are seeking unspecified damages and abatement under various tort theories. Similar lawsuits may be filed in other jurisdictions. We believe these lawsuits are an inappropriate vehicle to address the challenges associated with climate change and will vigorously defend against them for lacking factual and legal merit. The ultimate outcome and impact to us of any such litigation cannot be predicted with certainty, and we could incur substantial legal costs associated with defending these and similar lawsuits in the future. Additionally, any of these risks could result in unexpected costs, negative sentiments about our company, disruptions in our operations, increases to our operating expenses and reduced demand for our products, which in turn could have an adverse effect on our business, financial condition and results of operations.

You should also read and consider risk factors specific to Phillips 66’s businesses that will also affect the combined company after the completion of the Merger. These risks are described in Part I, Item 1A of Phillips 66’s Annual Report on Form 10-K for the year ended December 31, 2020 and Part II, Item 1A of Phillips 66’s Quarterly Reports on Form 10-Q for the quarterly periods ended March 31, 2021, June 30, 2021, and September 30, 2021, and in other documents that are incorporated by reference herein. For more information, see “Where You Can Find More Information.”

Risks Relating to PSXP’s Business

You should read and consider risk factors specific to PSXP’s businesses that will also affect the combined company after the completion of the Merger. These risks are described in Part I, Item 1A of PSXP’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020 and Part II, Item 1A of PSXP’s Quarterly Reports on Form 10-Q for the quarterly periods ended March 31, 2021, June 30, 2021, and September 30, 2021, and in other documents that are incorporated by reference herein. For more information, see “Where You Can Find More Information.”

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CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

This information statement/prospectus and the information incorporated by reference in this information statement/prospectus includes forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act. These forward-looking statements are subject to risks and uncertainties, and actual results might differ materially from those discussed in, or implied by, the forward-looking statements. Forward-looking statements are based on the current beliefs and assumptions of the management of Phillips 66 and PSXP and can often be identified by terms and phrases that include “anticipate,” “believe,” “intend,” “estimate,” “expect,” “continue,” “should,” “would,” “could,” “may,” “plan,” “project,” “predict,” “will,” “potential,” “forecast,” “target,” “guidance,” “outlook,” or other similar terminology. Various factors may cause actual results to be materially different than the suggested outcomes within forward-looking statements. Accordingly, there is no assurance that such results will be realized.

In light of these risks, uncertainties and assumptions, the events described in the forward-looking statements included or incorporated by reference in this information statement/prospectus might not occur or might occur to a different extent or at a different time than described. Actual results may differ materially from the current expectations of Phillips 66 and PSXP depending on a number of factors affecting their businesses and risks associated with the successful execution of the Merger. In evaluating these forward-looking statements, you should carefully consider the risks described herein and in the reports that Phillips 66 and PSXP file with the SEC. See “Risk Factors” and “Where You Can Find More Information.” Factors that could have a material adverse effect on operations and future prospects or that could cause events or circumstances to differ from the forward-looking statements include, but are not limited to:

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Except as otherwise required by law, neither Phillips 66 nor PSXP is under any obligation, and each expressly disclaims any obligation, to update, alter, or otherwise revise any forward-looking statements, whether written or oral, that may be made from time to time, whether as a result of new information, future events or otherwise. Persons reading this information statement/prospectus are cautioned not to place undue reliance on any forward-looking statements, which speak only as of the date such statement is made.

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INFORMATION ABOUT THE COMPANIES

Phillips 66

Phillips 66, headquartered in Houston, Texas, was incorporated in Delaware in 2011 in connection with, and in anticipation of, a restructuring of ConocoPhillips that separated its downstream businesses into an independent, publicly traded company named Phillips 66. The two companies were separated by ConocoPhillips distributing to its stockholders all the then-outstanding shares of Phillips 66 Common Stock after the market closed on April 30, 2012.

Phillips 66’s business is organized into four operating segments:

1) Midstream—Provides crude oil and refined petroleum product transportation, terminaling and processing services, as well as natural gas and NGL transportation, storage, fractionation, processing and marketing services, mainly in the United States. This segment includes PSXP, Phillips 66’s 50% equity investment in DCP Midstream, LLC, and Phillips 66’s investment in NOVONIX Limited.

2) Chemicals—Consists of Phillips 66’s 50% equity investment in Chevron Phillips Chemical Company LLC, which manufactures and markets petrochemicals and plastics on a worldwide basis.

3) Refining—Refines crude oil and other feedstocks into petroleum products, such as gasoline, distillates and aviation fuels, at 12 refineries in the United States and Europe.

4) Marketing and Specialties (M&S)—Purchases for resale and markets refined petroleum products, mainly in the United States and Europe. In addition, this segment includes the manufacturing and marketing of specialty products, such as base oils and lubricants.

Phillips 66 is incorporated in Delaware. Its principal executive offices are located at 2331 CityWest Boulevard, Houston, Texas 77042, and its telephone number is (281) 293-6600. Phillips 66’s website address is www.phillips66.com. Information contained on Phillips 66’s website does not constitute part of this information statement/prospectus. Phillips 66 Common Stock is publicly traded on the NYSE under the ticker symbol “PSX.”

Additional information about Phillips 66 is included in documents incorporated by reference in this information statement/prospectus. See “Where You Can Find More Information.”

Phillips 66 Partners LP and Phillips 66 Partners GP LLC

PSXP, headquartered in Houston, Texas, is a Delaware limited partnership formed in 2013 by P66 Company and the General Partner, both wholly owned subsidiaries of Phillips 66. On July 26, 2013, PSXP completed its initial public offering, and the PSXP Common Units trade on the NYSE under the ticker symbol “PSXP.”

PSXP is a master limited partnership formed to own, operate, develop and acquire primarily fee-based midstream assets. PSXP is managed and operated by the executive officers of its General Partner, with oversight provided by its Board of Directors. Neither PSXP nor its subsidiaries have any employees. The General Partner has the sole responsibility for providing the employees and other personnel necessary to conduct PSXP’s operations.

PSXP primarily generates revenue by providing fee-based transportation, terminaling, processing, storage and fractionation services to Phillips 66 and other customers. PSXP’s equity affiliates primarily generate revenue from transporting and terminaling crude oil, refined petroleum products and NGL. Since PSXP does not own any of the crude oil, refined petroleum products and NGL it handles and does not engage in the trading of those commodities, PSXP has limited direct exposure to risks associated with fluctuating commodity prices, although these risks indirectly influence PSXP’s activities and results of operations over the long term.

PSXP’s operations are all conducted in the United States and comprise one reportable segment.

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PSXP’s and the General Partner’s principal executive offices are located at 2331 CityWest Boulevard, Houston, Texas 77042, and their telephone number is (855) 283-9237.

Additional information about PSXP is included in documents incorporated by reference into this information statement/prospectus. See “Where You Can Find More Information.”

Phoenix Sub LLC

Merger Sub is a Delaware limited liability company and a jointly owned subsidiary of P66 Company and P66 PDI. Merger Sub was formed on October 22, 2021, solely for the purpose of effecting the Merger. Upon completion of the Merger, Merger Sub will merge with and into PSXP, with PSXP surviving as an indirect, wholly owned subsidiary of Phillips 66. Merger Sub has not conducted any activities to date except for activities incidental to its formation and activities undertaken in connection with the Merger.

Merger Sub’s principal executive offices are located at 2331 CityWest Boulevard, Houston, Texas 77042, and its telephone number is (281) 293-6600.

Relationship Between the Parties

As of October 26, 2021, Phillips 66 and its subsidiaries owned 169,760,137 PSXP Common Units, representing approximately 70.21% of the outstanding PSXP Common Units and Series A Preferred Units on an as-converted basis. Phillips 66 and its subsidiaries also own 100% of the limited liability company interests of the General Partner, which owns the non-economic general partner interest in PSXP. Phillips 66 controls PSXP through its indirect ownership of the General Partner, and certain of the executive officers and directors of the General Partner are also officers and/or directors of Phillips 66 (or one of its subsidiaries).

The limited partner interests in PSXP owned by Phillips 66 and its subsidiaries immediately prior to the Effective Time will remain outstanding as limited partner interests in the surviving entity. The non-economic general partner interest in PSXP held by the General Partner will remain outstanding as a non-economic general partner interest in the surviving entity, and the General Partner will continue as the sole general partner of the surviving entity.

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WRITTEN CONSENTS OF PSXP LIMITED PARTNERS

PSXP Limited Partner Interests Consent Required

The approval of the Merger and the adoption of the Merger Agreement requires the affirmative consent of a Unit Majority.

The GP Board set the close of business on October 26, 2021 as the Record Date for determining the PSXP Limited Partners entitled to consent in writing to adopt the Merger Agreement and approve the Merger. As of the Record Date, P66 PDI, an indirect, wholly owned subsidiary of Phillips 66, beneficially owned 169,760,137 PSXP Common Units, representing approximately 70.21% of the outstanding PSXP Common Units and Series A Preferred Units on an as-converted basis and constituting a Unit Majority. On October 26, 2021, Phillips 66 caused P66 PDI to deliver a written consent approving the Merger Agreement and the transactions contemplated thereby, including the Merger. Accordingly, the delivery of the Written Consent was sufficient to approve the Merger Agreement and the transactions contemplated thereby, including the Merger, on behalf of the PSXP Limited Partners. For this reason, this information statement/prospectus is being provided to you for informational purposes only. You are not being asked for a proxy or written consent, and you are requested not to send a proxy or written consent.

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THE MERGER

General

On October 26, 2021, PSXP entered into the Merger Agreement with the General Partner, Phillips 66, P66 Company, P66 PDI, and Merger Sub, pursuant to which Merger Sub will merge with and into PSXP, with PSXP surviving as an indirect, wholly owned subsidiary of Phillips 66.

On October 26, 2021, the Conflicts Committee of the GP Board, by unanimous vote (a) determined that the Merger, including the Merger Agreement and the transactions contemplated thereby, are in the best interests of PSXP and its subsidiaries and the PSXP Public Unitholders, (b) approved the Merger, including the Merger Agreement and the transactions contemplated thereby (the foregoing constituting “Special Approval” as defined in the Third A&R Partnership Agreement), (c) recommended to the GP Board the approval of the Merger Agreement and the execution, delivery and performance of the Merger Agreement and the transactions contemplated thereby, including the Merger and (d) resolved, and recommended to the GP Board that the GP Board resolve, to direct that the Merger Agreement be submitted to a vote of the PSXP Limited Partners.

On October 26, 2021, the GP Board (acting, in part, based upon the receipt of such approval and recommendation of the Conflicts Committee), by unanimous vote (a) determined that the Merger Agreement and the transactions contemplated thereby, including the Merger, are in the best interests of PSXP and the PSXP Limited Partners, (b) authorized and approved the execution, delivery and performance of the Merger Agreement and the transactions contemplated thereby, including the Merger, (c) directed that the Merger Agreement be submitted to a vote of the PSXP Limited Partners and (d) authorized the PSXP Limited Partners to act by written consent pursuant to the terms of the Third A&R Partnership Agreement.

Upon completion of the Merger, subject to any applicable withholding tax, (i) each outstanding PSXP Common Unit other than the PSXP Common Units owned by Phillips 66 and its subsidiaries (each, a “PSXP Public Common Unit”) will be converted into the right to receive, subject to adjustment as described in the Merger Agreement, the Merger Consideration; (ii) each Partnership LTIP Award, other than a Director LTIP Award, whether vested or not vested, will cease to relate to or represent any right to receive a PSXP Common Unit and shall be converted into an award of restricted stock units relating to a number of shares of Phillips 66 Common Stock equal to the number of PSXP Common Units subject to such Partnership LTIP Award multiplied by the Exchange Ratio (rounded up to the nearest whole share) on the same terms and conditions as were applicable to the corresponding Partnership LTIP Award (a “Parent RSU”), including any applicable payment timing provisions and dividend equivalent rights; and (iii) each Director LTIP Award will become fully vested and automatically converted into the right to receive, with respect to each PSXP Common Unit subject thereto, the Merger Consideration (or, to the extent set forth under the terms of the applicable Director LTIP Award, cash in an amount equal to the value of the Merger Consideration determined based on the closing price of a share of Phillips 66 Common Stock as of the Closing Date) (plus any accrued but unpaid amounts in relation to distribution equivalent rights).

The limited partner interests in PSXP owned by Phillips 66 and its subsidiaries immediately prior to the Effective Time will remain outstanding as limited partner interests in the surviving entity. The non-economic general partner interest in PSXP held by the General Partner will remain outstanding as a non-economic general partner interest in the surviving entity, and the General Partner will continue as the sole general partner of the surviving entity.

Pursuant to the Third A&R Partnership Agreement, the approval of the Merger and the adoption of the Merger Agreement by PSXP also requires the affirmative vote or written consent of a Unit Majority. The GP Board set the close of business on October 26, 2021, as the Record Date for determining the PSXP Limited Partners entitled to consent in writing to adopt the Merger Agreement and approve the Merger. On October 26, 2021, Phillips 66 caused P66 PDI, which, as of such date, beneficially owned 169,760,137 PSXP Common Units,

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representing approximately 70.21% of the outstanding PSXP Common Units and Series A Preferred Units on an as-converted basis and constituting a Unit Majority, to deliver the Written Consent approving the Merger Agreement and the transactions contemplated thereby, including the Merger. Accordingly, the delivery of the Written Consent was sufficient to approve the Merger Agreement and the transactions contemplated thereby, including the Merger, on behalf of the PSXP Limited Partners. For this reason, this information statement/prospectus is being provided to you for informational purposes only. PSXP has not solicited and is not soliciting your adoption and approval of the Merger Agreement.

Background of the Merger

The senior management of Phillips 66 and PSXP, and the Phillips 66 Board and GP Board, regularly review operational and strategic opportunities to increase value for Phillips 66’s and PSXP’s respective investors. In connection with these reviews, these management teams and boards of directors have, from time to time, evaluated potential transactions that would further their respective strategic objectives and create value for Phillips 66 stockholders and PSXP Common Unitholders, as applicable. During the first quarter of 2021, while reviewing Phillips 66’s investment in PSXP and PSXP’s prospects for future growth, Phillips 66 senior management considered that investor preferences for traditional master limited partnership (“MLP”) structures have decreased during the past several years, including as a result of the Tax Cuts and Jobs Act of 2017, which took effect on January 1, 2018 and reduced the benefit of the MLP pass-through structure by reducing the U.S. federal corporate income tax rate from 35% to 21%. Phillips 66 further noted the general inaccessibility of the equity capital markets for traditional MLPs and an increased desire of investors to invest in companies legally structured as traditional corporations. These market trends have contributed to numerous restructuring transactions involving MLPs, including buy-ins of MLPs by their corporate sponsors, acquisitions of MLPs by third parties, elections by MLPs to convert into corporations for income tax purposes, state law purposes or both, and simplifications of MLPs in which incentive distribution rights are modified or eliminated to improve the MLP’s cost of capital. These transactions have resulted in a significant decrease in the number of outstanding MLPs.

During the first quarter of 2021, Phillips 66 engaged Latham & Watkins LLP (“Latham”) as its legal advisor and Citigroup Global Markets Inc. (“Citi”) and BofA Securities, Inc. (“BofA Securities”) as its financial advisors to assist Phillips 66 in evaluating various alternative structures with respect to its investment in PSXP, including, among others, a potential take-private transaction as well as continuing with the status quo.

During March 2021, Phillips 66 senior management continued reviewing alternative structures with respect to Phillips 66’s investment in PSXP, including a potential take-private transaction.

On March 30, 2021, Kevin Mitchell, Executive Vice President, Finance, and Chief Financial Officer of Phillips 66, provided the Phillips 66 Board with an overview of the U.S. oil and gas business environment. Mr. Mitchell noted that the upstream sector was reducing investment and going through a period of consolidation. As a result, Phillips 66 anticipated fewer organic midstream growth opportunities going forward, and expected the midstream sector to consolidate. Mr. Mitchell also discussed the long-term challenges surrounding the MLP structure and growth prospects for PSXP, including the relatively high cost of capital at PSXP and market uncertainty around the continued operation of the Dakota Access pipeline (“DAPL”). Mr. Mitchell described for the Phillips 66 Board a proposed structure for a take-private of PSXP in which Phillips 66 would issue new shares of Phillips 66 Common Stock in exchange for PSXP Common Units, as well as a proposed timeline for negotiating and completing the transaction. The Phillips 66 Board indicated its support for a potential take-private of PSXP in an all-equity transaction.

On April 1, 2021, Tim Roberts, Executive Vice President, Midstream, contacted Mark A. Haney, an independent member of the GP Board and the Chairman of the Conflicts Committee, and informed him that Phillips 66 would be sending a preliminary proposal to the GP Board offering to acquire all of the PSXP Public Common Units in a stock-for-unit exchange that would result in PSXP becoming an indirect wholly owned

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subsidiary of Phillips 66 (the “Proposed Transaction”). Mr. Roberts informed Mr. Haney that Phillips 66 would invite the Conflicts Committee and its advisors to meet with Phillips 66 and its advisors during the following week to review the preliminary proposal in more detail and encouraged Mr. Haney to engage advisors in connection with the Proposed Transaction. After Mr. Haney heard from Mr. Roberts, Mr. Haney contacted representatives of Evercore Group L.L.C. (“Evercore”) and Vinson & Elkins L.L.P. (“Vinson & Elkins”) to discuss engaging Evercore and Vinson & Elkins as independent financial and legal advisors, respectively, to the Conflicts Committee if Phillips 66 made a proposal to the Conflicts Committee. Mr. Haney contacted Evercore and Vinson & Elkins based on their prior experience with representing the Conflicts Committee and Evercore’s and Vinson & Elkins’ experience, qualifications and expertise with prior dropdown and simplification transactions between Phillips 66 and PSXP, along with their substantial overall experience with respect to midstream oil and gas companies and MLP transactions, and his high regard for their capabilities and experience. Mr. Haney sent a draft of Evercore’s engagement letter with respect to the Proposed Transaction to Vinson & Elkins for review. The Conflicts Committee executed engagement letters with Evercore on April 4, 2021 and Vinson & Elkins on April 13, 2021.

Also on April 1, 2021, representatives of the General Partner circulated written questionnaires to Mr. Haney, as well as Messrs. P. David Bairrington and C. Doug Johnson, independent members of the GP Board and the other members of the Conflicts Committee, in order to evaluate their continued eligibility under the Third A&R Partnership Agreement to serve as members of the Conflicts Committee.

On April 6, 2021, Phillips 66 sent a non-binding, preliminary proposal (the “Initial Offer”) setting forth certain terms of the Proposed Transaction pursuant to which Phillips 66 would acquire all of the outstanding PSXP Public Common Units in a stock-for-unit merger transaction that would result in PSXP becoming an indirect wholly owned subsidiary of Phillips 66 at a to-be-determined exchange ratio with a value of $32.57 per PSXP Public Common Unit, the closing price of the PSXP Common Units on April 5, 2021, implying an exchange ratio of 0.3969 shares of Phillips 66 Common Stock for each PSXP Public Common Unit based upon the closing price of Phillips 66 Common Stock on April 5, 2021.

Also on April 6, 2021, the GP Board, following review of the written responses of Messrs. Haney, Bairrington and Johnson to their respective questionnaires, adopted resolutions confirming the appointment of each of them to the Conflicts Committee and delegating to the Conflicts Committee the authority to (i) review any potential conflicts arising in connection with the Merger and the agreements related to the Merger, (ii) provide for negotiation of any terms of the Merger and the agreements related to the Merger as the Conflicts Committee may deem necessary or appropriate, in its sole discretion, and (iii) determine whether to approve, and whether to recommend the GP Board approve, the Merger and the agreements related to the Merger (any such approval to constitute Special Approval under the Third A&R Partnership Agreement) (clauses (i) through (iii), collectively, the “Delegation”). The Conflicts Committee was also authorized to retain legal and financial advisors in its sole discretion. Such authorization also ratified any actions previously taken by the Conflicts Committee in connection with the process.

On April 9, 2021, the Conflicts Committee met with representatives of Evercore and Vinson & Elkins to discuss preliminary considerations with respect to the Proposed Transaction, including the engagement of legal and financial advisors to assist the Conflicts Committee in its evaluation of the Proposed Transaction. Vinson & Elkins then provided a brief overview of the Conflicts Committee’s duties under the Third A&R Partnership Agreement and applicable law with respect to the Proposed Transaction. The Conflicts Committee and its legal and financial advisors then generally discussed the Initial Offer and the Proposed Transaction, during which the members of the Conflicts Committee asked questions, and received answers, regarding the Initial Offer and the Proposed Transaction.

Immediately after that meeting, representatives of Phillips 66, Latham, Citi and BofA Securities met with the members of the Conflicts Committee, Vinson & Elkins and Evercore. During the meeting, representatives of Phillips 66 provided a presentation to the Conflicts Committee and its legal and financial advisors in which

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representatives of Phillips 66 provided a summary of the Initial Offer and discussed with the Conflicts Committee and its advisors the strategic rationale for the Proposed Transaction, including the reasons why Phillips 66 believed the Initial Offer provided fair value for the PSXP Public Common Units and was in the PSXP Public Unitholders’ best interests. During the presentation, Phillips 66 highlighted its view that the Initial Offer fairly values both the near and long term economic prospects of PSXP, which Phillips 66 considered to be limited, and noted that (i) the MLP market was likely to remain challenged as evidenced by the fact that other midstream companies have been moving away from the MLP structure, (ii) MLP growth will continue to be hindered by limited access to the equity capital markets, and (iii) Phillips 66 had no plans for further dropdown transactions with PSXP due to a lack of equity capital markets support for such transactions and compressed valuations between MLPs and their corporate sponsors. Phillips 66 further highlighted that providing PSXP Public Unitholders with Phillips 66 Common Stock would provide them with an ownership interest in a more diverse energy vehicle, spanning midstream, refining, marketing and specialties, and chemicals, with a stronger credit profile and an established history of returning capital to shareholders. Phillips 66 further noted that PSXP Public Unitholders would benefit from enhanced governance rights through participation in a traditional corporate governance structure. In connection with its presentation, Phillips 66 also provided the Conflicts Committee and its advisors with the Forecasts (as defined below), including PSXP’s projected financial results for 2021 through 2026 assuming no further dropdown transactions under both a scenario in which DAPL was not shut down for any portion of the forecast period (“DAPL Online”) and a scenario in which DAPL was shut down during the second quarter of 2021 and remained offline for the remainder of the forecast period (“DAPL Offline”). Please read “—Unaudited Financial Forecasts Relating to PSXP.” Phillips 66 also noted that, starting with PSXP’s 2021 second quarter distribution, it expected PSXP senior management to recommend to the GP Board a 50% reduction in PSXP’s quarterly distributions, in line with peer MLPs that had announced distribution cuts, for a number of reasons, including uncertainty around DAPL and a desire to reduce leverage and strengthen PSXP’s balance sheet. During the course of the meeting, members of the Conflicts Committee and its advisors asked questions, and received answers, regarding the Initial Offer and the Proposed Transaction.

Also on April 9, 2021, Judge James Boasberg, the federal judge presiding over litigation against the U.S. Army Corps of Engineers (“Army Corps”) related to DAPL, held a status conference to discuss the plaintiff Native American tribes’ request that the court order a shutdown of DAPL’s operations while the Army Corps prepares a court-ordered environmental impact statement (“EIS”) addressing DAPL’s crossing of federal lands at Lake Oahe. The court gave Dakota Access LLC (“Dakota Access”), the operator of DAPL, ten days to file supplemental evidence of the adverse economic effects of a shutdown.

On April 15, 2021, PSXP entered into a non-disclosure agreement (the “Stonepeak NDA”) with Stonepeak Partners LP (“Stonepeak”), to facilitate discussions with Stonepeak regarding the implications of the Proposed Transaction on the Series A Preferred Units held by an affiliate of Stonepeak.

Also on April 15, 2021, Messrs. Haney and Bairrington had a conference call with representatives of Vinson & Elkins to discuss the status of the DAPL litigation, the issues involved and possible outcomes. Periodically thereafter, Messrs. Haney and Bairrington discussed subsequent developments with respect to the DAPL litigation and the EIS with representatives of Vinson & Elkins.

On April 16, 2021, Phillips 66 granted access to an electronic data room to representatives of Vinson & Elkins and Evercore to assist in their respective due diligence review of Phillips 66 in connection with the Proposed Transaction.

On April 19, 2021, the Conflicts Committee met telephonically with representatives of Evercore and Vinson & Elkins to discuss the Initial Offer and Evercore’s initial preliminary financial analysis relating to the Proposed Transaction. Vinson & Elkins provided a brief overview of the Initial Offer and the Proposed Transaction. Evercore then presented materials regarding its preliminary financial analysis. During the presentation, Evercore provided, among other things, (i) an overview of Phillips 66 and PSXP, (ii) a summary of the Initial Offer and the Proposed Transaction, (iii) a discussion of the Forecasts, including both DAPL Online

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and DAPL Offline, and (iv) a detailed valuation analysis of PSXP, including (1) a discounted cash flow analysis, (2) a discounted distribution analysis, (3) a peer group trading analysis and, for reference purposes, (4) a precedent mergers and acquisitions analysis. Vinson & Elkins then reviewed with the Conflicts Committee its duties under the Third A&R Partnership Agreement and applicable law with respect to the Proposed Transaction and engaged in a discussion of such duties with the Conflicts Committee. During the course of the meeting, the members of the Conflicts Committee and its advisors asked questions, and received answers, regarding the Initial Offer and the Proposed Transaction. The Conflicts Committee and its advisors then discussed next steps both for the Conflicts Committee and the Proposed Transaction.

Also on April 19, 2021, Dakota Access filed supplemental evidence with the U.S. federal court showing the likely adverse economic effects of a shutdown of the pipeline. The State of North Dakota also sought to intervene in the litigation and filed its own evidence of adverse effects of a shutdown.

On April 20, 2021, Evercore provided Phillips 66 with Evercore’s initial due diligence information requests with respect to Phillips 66, PSXP and the Proposed Transaction. Also on that same day, representatives of Phillips 66 spoke to representatives of Stonepeak and indicated that Phillips 66 was exploring a potential take-private transaction with PSXP. Phillips 66 and Stonepeak discussed amending the Third A&R Partnership Agreement to provide that the Series A Preferred Units would automatically convert into PSXP Common Units in any such take-private transaction.

Also on April 20, 2021, PSXP declared its first-quarter distribution, payable on May 14, 2021, of $0.875 per PSXP Common Unit.

Between April 20, 2021 and extending through the signing date of the Merger Agreement, Evercore conducted due diligence, primarily by email information requests and follow up questions to representatives of Phillips 66 and PSXP, to review PSXP’s operations and Forecasts. Evercore reviewed the key differences between the Forecasts for DAPL Online and DAPL Offline.

On April 21, 2021, Vinson & Elkins provided Phillips 66 with its initial due diligence information requests with respect to Phillips 66, PSXP and the Proposed Transaction.

On April 22, 2021, representatives of Latham, on behalf of Phillips 66, distributed an initial draft of the Merger Agreement to Vinson & Elkins. The draft Merger Agreement, among other things, (i) provided that the obligations of Phillips 66 and PSXP to consummate the Merger would be conditioned on, among other things, the delivery of the Written Consent approving the Merger and the continued effectiveness of such Written Consent, (ii) contained customary representations and warranties of the parties, (iii) included affirmative and negative covenants relating to each party’s respective business during the period between execution of the Merger Agreement and closing of the Merger and (iv) provided for expense reimbursement under specified circumstances.

On April 23, 2021, the Conflicts Committee met telephonically with representatives of Evercore and Vinson & Elkins so that the Conflicts Committee could receive Evercore’s updated preliminary financial analysis and an update on Vinson & Elkins’ due diligence process. Evercore discussed its updated preliminary financial analysis, including (i) at the direction of the Conflicts Committee, a new sensitivity case based on the Forecasts and assuming DAPL remained offline for a period of two years before resuming service and (ii) a pro forma impact analysis. Following the discussion of Evercore’s preliminary financial analysis, the Conflicts Committee determined to propose a to-be-determined exchange ratio with a value of $45.00 per PSXP Public Common Unit in connection with the Merger and authorized Evercore to convey such proposal to Citi. Vinson & Elkins then briefly discussed with the Conflicts Committee its review of legal matters, including the draft Merger Agreement and responses to its due diligence information requests.

On April 26, 2021, representatives of Evercore orally delivered to representatives of Citi the Conflicts Committee’s response to the Initial Offer. On behalf of the Conflicts Committee, Evercore proposed a

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stock-for-unit merger transaction at a to-be-determined exchange ratio with a value of $45.00 per PSXP Public Common Unit.

On that same day, the Conflicts Committee met telephonically with representatives of Evercore and Vinson & Elkins to discuss Evercore’s preliminary financial analysis regarding the hypothetical tax liability of the PSXP Public Unitholders as a result of the Proposed Transaction.

Also on April 26, 2021, Judge Boasberg ordered the Army Corps to file a status report by May 3, 2021 giving (i) the Army Corps’ latest estimate for the completion of the EIS and (ii) the Army Corps’ position, if it had one, on whether the court should issue an injunction.

On April 29, 2021, representatives of Vinson & Elkins provided a supplemental due diligence information request to Phillips 66.

On that same day, the Conflicts Committee met telephonically with representatives of Evercore and Vinson & Elkins, at which time Vinson & Elkins presented an overview of the draft Merger Agreement, highlighting: (i) the mechanics of the Merger and (ii) certain key issues, to be included in a non-price related business issues list that could be communicated to Phillips 66 and Latham, including (1) whether to exclude adverse changes, events or conditions arising from issues around DAPL in the definition of Material Adverse Effect, (2) whether to include certain customary interim covenants seen in precedent merger agreements relating to the target’s conflicts committee during the period between signing and closing, (3) the effects of the Proposed Transaction on Director LTIP Awards, (4) the scope of Phillips 66’s and PSXP’s representations and warranties, (5) the scope of Phillips 66’s and PSXP’s interim operating covenants, (6) whether to (A) include majority of the minority approval (as defined below), and (B) modify the closing conditions regarding accuracy of the representations and warranties and (7) a proposed expense reimbursement cap of $4.5 million in the case of certain termination conditions. The members of the Conflicts Committee asked questions, and received answers, regarding the draft Merger Agreement and the non-price related business issues list.

During the week of May 2, 2021, representatives of Phillips 66 populated the electronic data room with responses to, and with respect to certain requests, responsive documents regarding, Vinson & Elkins’ due diligence information requests.

On May 2, 2021, Mr. Johnson, a member of the Conflicts Committee, notified representatives of the General Partner that he had recently become aware of an insignificant equity interest in Phillips 66 held in one of his retirement accounts. Mr. Johnson promptly disclosed such information to the GP Board and tendered to the GP Board his resignation from the Conflicts Committee.

On May 3, 2021, the Conflicts Committee met telephonically with representatives of Evercore and Vinson & Elkins to further discuss the draft Merger Agreement and the non-price related business issues in the draft discussed at the prior Conflicts Committee meeting on April 29, 2021.    

On that same day, representatives of Vinson & Elkins provided additional supplemental due diligence information requests to Phillips 66 and PSXP.

Also on May 3, 2021, the Army Corps filed a status report with Judge Boasberg affirming the Army Corps’ opposition to the plaintiff Native American tribes’ request for an order shutting down DAPL operations while the Army Corps prepares the EIS, and giving March 2022 as the estimated completion date for the EIS.

On May 6, 2021, the GP Board, following due consideration of the circumstances regarding Mr. Johnson’s proposed resignation from the Conflicts Committee, accepted Mr. Johnson’s resignation from the Conflicts Committee and further evaluated each of Messrs. Bairrington and Haney as to whether they continued to satisfy the independence and other requirements set forth in the Third A&R Partnership Agreement to serve as members

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of the Conflicts Committee. Following such evaluation, the GP Board adopted resolutions (i) affirmatively determining that (1) neither of Mr. Bairrington nor Mr. Haney had any relationship with or ownership interest in the General Partner or its affiliates that would interfere with the exercise of his independent judgment in carrying out the responsibilities of a member of the Conflicts Committee in evaluating the Proposed Transaction or any relationship that would otherwise result in either of them not satisfying the requirements of a member of the Conflicts Committee as provided for in the Third A&R Partnership Agreement and (2) each of Messrs. Bairrington and Haney continues to satisfy the independence and other requirements set forth in the Third A&R Partnership Agreement to serve as a member of the Conflicts Committee, (ii) confirming, adopting and ratifying the Delegation in all respects, and (iii) ratifying in all respects all actions previously performed by the Conflicts Committee, Mr. Bairrington or Mr. Haney, or any of the Conflicts Committee’s advisors that were within the scope of the Delegation.

On that same day, representatives of Citi, on behalf of Phillips 66, delivered a due diligence information request response log to representatives of Evercore containing responses to Vinson & Elkins’ due diligence information requests.

On May 7, 2021, representatives of Citi, on behalf of Phillips 66, delivered a letter (the “May 7 Letter”) to representatives of Evercore containing Phillips 66’s response to the Conflicts Committee’s April 26 proposal. In the May 7 Letter, Phillips 66 proposed a stock-for-unit merger transaction at a to-be-determined exchange ratio with a value of $34.77 per PSXP Public Common Unit, the closing price of the PSXP Common Units on May 6, 2021 (the “May 7 Proposal”), implying an exchange ratio of 0.4061 shares of Phillips 66 Common Stock for each PSXP Public Common Unit based upon the closing price of the Phillips 66 Common Stock on May 6, 2021.

On May 10, 2021, the Conflicts Committee met telephonically with representatives of Evercore and Vinson & Elkins to discuss Mr. Johnson’s resignation from the Conflicts Committee. Following such discussion, the Conflicts Committee adopted resolutions (i) confirming, adopting and ratifying, in all respects, (1) the Conflicts Committee’s engagement of Evercore and Vinson & Elkins and (2) all actions previously performed by the Conflicts Committee, Mr. Bairrington or Mr. Haney, or any of the Conflicts Committee’s advisors that were within the scope of the Delegation; (ii) determining that all actions previously performed by the Conflicts Committee, Mr. Bairrington or Mr. Haney, or any of the Conflicts Committee’s advisors were not influenced by Mr. Johnson in any manner favorable to Phillips 66 or unfavorable to PSXP or the PSXP Public Unitholders, and (iii) authorizing the Conflicts Committee and each of its members to take all actions necessary or appropriate to carry out the duties of the Conflicts Committee related to the Proposed Transaction. Following the adoption of the resolutions, Evercore reviewed its updated preliminary financial analysis based on the May 7 Proposal. The Conflicts Committee then deliberated and determined to propose a fixed exchange ratio of 0.51 shares of Phillips 66 Common Stock for each PSXP Public Common Unit and authorized Evercore to convey such proposal to Citi.

On that same day, representatives of Evercore, on behalf of the Conflicts Committee, delivered a response to Phillips 66’s proposal in the May 7 Letter in a telephone conversation with representatives of Citi. Evercore relayed to Citi that the Conflicts Committee proposed a stock-for-unit merger transaction with a fixed exchange ratio in which each PSXP Public Unitholder would receive 0.51 shares of Phillips 66 Common Stock for each PSXP Public Common Unit (the “May 10 Proposal”).

On May 11, 2021, representatives of Phillips 66, acting on behalf of the General Partner, met with representatives of Stonepeak to further discuss amending the Third A&R Partnership Agreement to provide that the Series A Preferred Units would automatically convert into PSXP Common Units in any such take-private transaction.

On May 12, 2021, at a regular meeting of the Phillips 66 Board, Mr. Mitchell provided an update to the Phillips 66 Board of the Proposed Transaction, including the negotiation of the proposed financial terms of the Merger and the Conflicts Committee’s May 10 Proposal, as well as negotiations with Stonepeak. Mr. Mitchell reviewed with the Phillips 66 Board a potential timeline for consummating the Proposed Transaction and

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responded to questions regarding the impact a disruption in the operation of DAPL would have on the Proposed Transaction. The Phillips 66 Board indicated its continued support for the Proposed Transaction.

On May 17, 2021, representatives of Citi, on behalf of Phillips 66, delivered a letter (the “May 17 Letter”) to representatives of Evercore containing Phillips 66’s response to the Conflicts Committee’s May 10 Proposal. In the May 17 Letter, Phillips 66 proposed a stock-for-unit merger transaction at a fixed exchange ratio of 0.45 shares of Phillips 66 Common Stock for each PSXP Public Common Unit (the “May 17 Proposal”).

On May 21, 2021, the Conflicts Committee met telephonically with representatives of Evercore and Vinson & Elkins to discuss the May 17 Proposal and a potential counterproposal. The Conflicts Committee decided to give further consideration to the May 17 Proposal and the Proposed Transaction before offering a counterproposal.

Also on May 21, 2021, Judge Boasberg denied the plaintiff Native American tribes’ request for an order shutting down DAPL. The court explained that the pipeline remained an unlawful encroachment across federal land, but that given the tribes’ failure to meet the legal standard for a permanent injunction, it was up to the Army Corps to determine whether to exercise its enforcement powers to order a shutdown.

On May 24, 2021, the Conflicts Committee met telephonically with representatives of Evercore and Vinson & Elkins to further discuss the May 17 Proposal and a potential counterproposal. Following consideration of the Proposed Transaction, including the analysis of its advisors, the Conflicts Committee determined to propose a fixed exchange ratio of 0.50 shares of Phillips 66 Common Stock for each PSXP Public Common Unit and authorized Evercore to convey such proposal to Citi.

On that same day, representatives of Evercore, on behalf of the Conflicts Committee, delivered a response to Phillips 66’s May 17 Proposal in a telephone conversation with representatives of Citi. Evercore relayed to Citi that the Conflicts Committee proposed a stock-for-unit merger transaction at a fixed exchange ratio of 0.50 shares of Phillips 66 Common Stock for each PSXP Public Common Unit (the “May 24 Proposal”).

Also on May 24, 2021, representatives of Vinson & Elkins provided Latham with an issues list (the “May 24 Issues List”) identifying non-price related business issues in the draft Merger Agreement provided to Vinson & Elkins on April 22, 2021, including: (i) the definition of “Material Adverse Effect” as it related to litigation or legal or regulatory issues involving DAPL; (ii) Phillips 66’s ability to eliminate the Conflicts Committee, diminish the Conflicts Committee’s authority prior to the closing of any Proposed Transaction, or amend or waive the Merger Agreement without the Conflicts Committee’s prior written approval; and (iii) the scope of each party’s respective representations, warranties and interim operating covenants. Vinson & Elkins also proposed that the Merger Agreement include a closing condition requiring the approval of the Merger Agreement by a majority of the PSXP Public Unitholders (“majority of the minority approval”).

On May 27, 2021, representatives of Latham discussed the May 24 Issues List with representatives of Vinson & Elkins, including Vinson & Elkins’ proposal to add a majority of the minority approval closing condition to the Merger Agreement. Latham indicated that Phillips 66 would not agree to the inclusion of a majority of the minority approval closing condition in the Merger Agreement. Latham and Vinson & Elkins also discussed the status of Vinson & Elkins’ due diligence review in relation to the Proposed Transaction.

On June 1, 2021, the Conflicts Committee and its financial and legal advisors held a conference call with representatives of Phillips 66 and its legal advisors to discuss various due diligence matters, including Phillips 66’s expectations with respect to the treatment of the Series A Preferred Units in connection with the Proposed Transaction and discussions with Stonepeak regarding a proposed amendment to the Third A&R Partnership Agreement.

After the conference call, the Conflicts Committee and representatives of Evercore and Vinson & Elkins held a telephonic meeting to further discuss the treatment of the Series A Preferred Units in connection with the Proposed Transaction.

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Later that same day, Vinson & Elkins provided a revised draft of the Merger Agreement to Latham. Among other things, the revised draft of the Merger Agreement: (i) provided that any action or determination of a governmental authority, or legal proceeding, related to DAPL would not constitute a “Material Adverse Effect”; (ii) proposed certain changes to the representations and warranties of the parties; (iii) proposed certain additional representations and warranties of Phillips 66; (iv) proposed additional limitations in Phillips 66’s interim operating covenant with respect to the pre-closing operation of Phillips 66’s business; (v) proposed language restricting the ability of Phillips 66 and its subsidiaries, including the General Partner, from taking any action, without the prior written consent of a majority of the members of the Conflicts Committee, to (1) eliminate the Conflicts Committee, (2) revoke or diminish the authority of the Conflicts Committee or remove or cause the removal of any member of the Conflicts Committee (other than filling any vacancy caused by resignation, death or incapacity of any such member), (3) amend or terminate the Merger Agreement, or (4) cause the General Partner to make any determination (including to exercise or refrain from exercising its rights) under the Merger Agreement; and (vi) proposing a cap of $4.5 million on each party’s respective expense reimbursement.

On June 4, 2021, representatives of Vinson & Elkins provided a supplemental due diligence information request to Latham.

On June 15, 2021, representatives of Phillips 66, on behalf of the General Partner, provided a draft of the LPA Amendment to representatives of Stonepeak.

On June 24, 2021, representatives of Citi, on behalf of Phillips 66, delivered a letter (the “June 24 Letter”) to representatives of Evercore containing Phillips 66’s response to the Conflicts Committee’s May 24 Proposal. In the June 24 Letter, Phillips 66 proposed a stock-for-unit merger transaction at a fixed exchange ratio of 0.465 shares of Phillips 66 Common Stock for each PSXP Public Common Unit (the “June 24 Proposal”).

Later that same day, Latham provided a revised draft of the Merger Agreement to Vinson & Elkins. Among other things, the revised draft of the Merger Agreement: (i) provided that any action or determination of a governmental authority, or legal proceeding, related to DAPL would not constitute a “Material Adverse Effect” to the extent existing as of the date of the Merger Agreement; (ii) proposed certain changes to the representations and warranties and interim operating covenants of the parties; and (iii) proposed language permitting the General Partner to (1) remove a member of the Conflicts Committee in connection with such director’s removal from the GP Board for cause, or (2) amend or terminate the Merger Agreement or make any determination under the Merger Agreement without the prior written approval of the Conflicts Committee, provided that (A) the General Partner has provided the Conflicts Committee advance notice of such action and permitted the Conflicts Committee to make a recommendation with respect to such matter to the GP Board within two business days and (B) in the event that the General Partner takes or authorizes any action that is counter to the recommendation of the Conflicts Committee, then the Conflicts Committee may rescind its Special Approval of the Proposed Transaction for all purposes of the Third A&R Partnership Agreement.

Also on June 24, 2021, representatives of Stonepeak provided a revised draft of the LPA Amendment to representatives of Phillips 66.

On June 28, 2021, representatives of Phillips 66 and Latham discussed Stonepeak’s proposed changes to the LPA Amendment with representatives of Stonepeak and Sidley Austin LLP, legal counsel to Stonepeak.

On that same day, representatives of Phillips 66 posted additional information in the electronic data room responding to, and with respect to certain requests, responsive documents regarding, Vinson & Elkins’ due diligence information requests.

Also on June 28, 2021, the Conflicts Committee met telephonically with representatives of Evercore and Vinson & Elkins to discuss the June 24 Proposal. Evercore reviewed its updated preliminary financial analysis based on the June 24 Proposal. The members of the Conflicts Committee asked questions, and received answers,

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regarding the June 24 Proposal and Evercore’s preliminary financial analysis. The Conflicts Committee then determined to propose a fixed exchange ratio of 0.495 shares of Phillips 66 Common Stock for each PSXP Public Common Unit and authorized Evercore to convey such proposal to Citi.

On June 29, 2021, representatives of Evercore, on behalf of the Conflicts Committee, delivered a response to Phillips 66’s June 24 Proposal in a telephone conversation with representatives of Citi. Evercore relayed to Citi that the Conflicts Committee proposed a stock-for-unit merger transaction at a fixed exchange ratio of 0.495 shares of Phillips 66 Common Stock for each PSXP Public Common Unit (the “June 29 Proposal”).

On July 14, 2021, at a regular meeting of the Phillips 66 Board, Mr. Mitchell provided an update to the Phillips 66 Board of the Proposed Transaction, including the negotiation of the proposed financial terms of the Proposed Transaction and the Conflicts Committee’s June 29 Proposal. Mr. Mitchell informed the Phillips 66 Board that, given the difference between the June 24 Proposal and the June 29 Proposal and the then-relative trading prices of Phillips 66 Common Stock and PSXP Common Units, reaching an agreement on terms acceptable to both parties could be challenging. After discussion, the Phillips 66 Board indicated its continued support for the Proposed Transaction, assuming the parties were able to reach an agreement on the financial terms of the Proposed Transaction.

After the July 14, 2021 Phillips 66 Board meeting, Phillips 66 senior management continued to evaluate the Proposed Transaction, including the difference between the June 24 Proposal and the June 29 Proposal and the then-relative trading prices of Phillips 66 Common Stock and PSXP Common Units, as well as then-current market conditions. Given the totality of the circumstances at the time, Phillips 66 senior management decided to not immediately respond to the June 29 Proposal and instead focus on Phillips 66’s business objectives and monitor developments in the oil and gas industry before determining next steps.

On July 20, 2021, PSXP declared its second-quarter distribution, payable on August 13, 2021, of $0.875 per PSXP Common Unit, which did not reflect any reduction in the quarterly distribution from the first quarter distribution. On several occasions prior to such second quarter distribution declaration, the members of the Conflicts Committee had discussed the possibility of a distribution cut with its financial and legal advisors and did not believe a distribution cut was likely after taking into account positive developments in the DAPL litigation since the April 9 presentation by Phillips 66 and that there did not appear to be significant issues with leverage or coverage ratios going forward.

In late August 2021, the Army Corps announced a six-month extension in the estimated target completion date for the EIS. The original estimated completion date of March 2022 was revised to September 2022.

On September 17, 2021 and again on September 20, 2021, representatives of Phillips 66 communicated with representatives of Stonepeak regarding amending the terms of the Stonepeak NDA to provide for an extended term.

On September 20, 2021, Dakota Access filed a petition for writ of certiorari before the U.S. Supreme Court asking for reversal of the D.C. Circuit Court’s January 26, 2021 decision requiring the Army Corps to produce the EIS.

On October 8, 2021, at a regular meeting of the Phillips 66 Board, Mr. Mitchell provided an update to the Phillips 66 Board of the Proposed Transaction, including the fact that no negotiations had taken place since the last board meeting, recent market trading activity with respect to Phillips 66 Common Stock and PSXP Common Units and the relative valuations associated with the exchange ratios previously proposed by the parties in the June 24 Proposal and the June 29 Proposal, as well as recent developments in the oil and gas industry. The Phillips 66 Board indicated its support for the recommencement of active negotiations with the Conflicts Committee with respect to the Proposed Transaction.

Also on October 8, 2021, representatives of Phillips 66 sent Stonepeak a draft amended Stonepeak NDA providing for an extended term.

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On October 11, 2021, representatives of Phillips 66 communicated with representatives of Stonepeak regarding the draft LPA Amendment.

On October 14, 2021, representatives of Phillips 66 communicated with representatives of Stonepeak regarding the LPA Amendment as well as the draft amended Stonepeak NDA.

On October 15, 2021, representatives of Citi, on behalf of Phillips 66, contacted representatives of Evercore to inform Evercore to expect a revised offer from Phillips 66 during the week of October 18. Also on that same day, representatives of Phillips 66 provided a revised draft of the Stonepeak NDA to Stonepeak, and representatives of Stonepeak provided a revised draft of the LPA Amendment to Phillips 66.

On October 18, 2021, representatives of Citi, on behalf of Phillips 66, delivered a response to the Conflicts Committee’s June 29 Proposal in a telephone conversation with representatives of Evercore. Citi relayed to Evercore that Phillips 66 proposed a stock-for-unit merger transaction at a fixed exchange ratio of 0.49 shares of Phillips 66 Common Stock for each PSXP Public Common Unit (the “October 18 Proposal”).

Also on October 18, 2021, the General Partner and Stonepeak executed the amended Stonepeak NDA providing that the term of the Stonepeak NDA would terminate on the earlier of October 15, 2022 and the closing of the Proposed Transaction.

On October 19, 2021, representatives of Latham discussed with representatives of Vinson & Elkins the resumption of negotiations with respect to the Proposed Transaction and indicated Phillips 66’s desire to finalize the Merger Agreement. Also on that same day, representatives of Phillips 66 provided Stonepeak with a revised draft of the LPA Amendment.

Later that same day, representatives of Vinson & Elkins provided revised supplemental due diligence information requests to Latham with respect to Phillips 66, PSXP and the Proposed Transaction.

Also on October 19, 2021, PSXP declared its third-quarter distribution, payable on November 12, 2021, of $0.875 per PSXP Common Unit, which did not reflect any reduction in the quarterly distribution for the second quarter distribution.

From October 19, 2021 through the signing of the Merger Agreement, representatives of Phillips 66 posted additional information to the electronic data room responding to, and with respect to certain requests, responsive documents regarding, Vinson & Elkins’ outstanding due diligence information requests.

On October 20, 2021, representatives of Citi communicated with representatives of Evercore, on behalf of the Conflicts Committee, regarding Phillips 66’s October 18 Proposal.

On that same day, the Conflicts Committee met telephonically with representatives of Evercore and Vinson & Elkins to discuss the recommencement of active negotiations with Phillips 66 and the October 18 Proposal. Evercore provided an overview of the history of the negotiations related to the Proposed Transaction and reviewed its updated preliminary financial analysis based on the October 18 Proposal. Evercore explained that Citi had noted that there were no updates to the Forecasts previously provided by Phillips 66 in April and that Citi had instructed Evercore that they could continue to rely on those prior Forecasts. The Conflicts Committee also discussed the status of the draft Merger Agreement and the outstanding legal issues. During the course of the meeting, members of the Conflicts Committee asked questions, and received answers, regarding the October 18 Proposal and the Proposed Transaction. The Conflicts Committee discussed next steps and decided to give further consideration to the October 18 Proposal and the Proposed Transaction, and to wait for negotiations on the draft Merger Agreement to progress before offering a counterproposal.

Later on October 20, 2021, Vinson & Elkins provided a revised draft of the Merger Agreement to Latham. Among other things, the revised draft of the Merger Agreement: (i) provided that any action or determination by

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or before a governmental authority, or legal proceeding, related to DAPL would not constitute a “Material Adverse Effect” to the extent they arise out of, or relate to, facts or circumstances relating to DAPL’s assets; (ii) proposed certain changes to the representations and warranties and interim operating covenants of the parties; and (iii) eliminated the General Partner’s ability to amend or terminate the Merger Agreement or make any determination under the Merger Agreement without the prior written approval of the Conflicts Committee. The revised draft also provided that the General Partner would cause PSXP to declare and pay a regular quarterly cash distribution on the PSXP Common Units in an amount not less than $0.875 per PSXP Common Unit for the quarterly period ending December 31, 2021 and each quarterly period thereafter during the term of the Merger Agreement. That same day, Latham provided Vinson & Elkins with the current draft of the LPA Amendment.

On October 21, 2021, representatives of Citi, on behalf of Phillips 66, notified Evercore of Phillips 66’s request for a counterproposal from the Conflicts Committee. After discussions with the Conflicts Committee, representatives of Evercore, on behalf of the Conflicts Committee, delivered a response to Phillips 66’s October 18 Proposal in a telephone conversation with representatives of Citi. Evercore relayed to Citi that the Conflicts Committee proposed a stock-for-unit merger transaction at a fixed exchange ratio of 0.505 shares of Phillips 66 Common Stock for each PSXP Public Common Unit (the “October 21 Proposal”). Later that same day, representatives of Citi, on behalf of Phillips 66, delivered a response to the Conflicts Committee’s October 21 Proposal proposing a best and final fixed exchange ratio of 0.50 shares of Phillips 66 Common Stock for each PSXP Public Common Unit (the “Final Offer”). Following the Conflicts Committee’s consideration of the Final Offer after discussions with its financial advisors and in light of the extensive prior information received by the Conflicts Committee, representatives of Evercore, on behalf of the Conflicts Committee, contacted representatives of Citi and accepted the Final Offer, subject to the final approval by the Conflicts Committee, finalization of the Merger Agreement and satisfaction of the Conflicts Committee’s remaining due diligence requests.

Later that same day, Latham provided a revised draft of the Merger Agreement to Vinson & Elkins. Among other things, the revised draft of the Merger Agreement: (i) provided that any action or determination by or before a governmental authority, or legal proceeding, related to DAPL would not constitute a “Material Adverse Effect” to the extent they arise out of facts or circumstances relating to DAPL’s assets and existing as of the date of the Merger Agreement; (ii) proposed certain changes to the representations and warranties and interim operating covenants of the parties; and (iii) proposed language to clarify the General Partner’s obligation to cause, and the timing of the payment of quarterly distributions on the PSXP Common Units prior to the anticipated closing of the Merger.

On October 21, 2021 and October 22, 2021, representatives of Phillips 66 communicated with representatives of Stonepeak regarding the LPA Amendment.

On October 22, 2021, representatives of Phillips 66 provided Stonepeak with a revised draft of the LPA Amendment.

Also on October 22, 2021, the Conflicts Committee met telephonically with representatives of Evercore and Vinson & Elkins to receive updates from Evercore and Vinson & Elkins on the status of negotiations related to the Proposed Transaction and the Merger Agreement. The Conflicts Committee also discussed with its advisors the reasons for, negative factors weighing against, and procedural considerations relating to the Proposed Transaction. Vinson & Elkins then provided the Conflicts Committee an update on Vinson & Elkins’ due diligence process.

On October 23, 2021, representatives of Phillips 66 delivered a proposed draft of a written consent of Stonepeak Screwdriver SPV LLC, an affiliate of Stonepeak and the holder of a Series A Required Voting Percentage (as defined in the Third A&R Partnership Agreement) (“Stonepeak SPV”), and P66 PDI, as the holder of a Unit Majority, consenting to and approving the execution of the LPA Amendment (the “LPA Consent”).

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Later that same day, representatives of Latham and Vinson & Elkins discussed Latham’s October 21 draft of the Merger Agreement, and Vinson & Elkins relayed the Conflicts Committee’s request for additional materiality qualifiers with respect to certain of PSXP’s representations and warranties. Latham, on behalf of Phillips 66, provided Vinson & Elkins with certain responses to Vinson & Elkins’ October 19 supplemental due diligence information request and an initial draft of PSXP’s disclosure schedules to the Merger Agreement that had been prepared by representatives of the General Partner on behalf of PSXP.

Also on October 23, 2021, Latham, on behalf of Phillips 66, provided Vinson & Elkins an initial draft of Phillips 66’s disclosure schedules to the Merger Agreement and a draft of the Written Consent, to be executed by P66 PDI as the holder of a Unit Majority, approving the Merger Agreement. Latham and Vinson & Elkins continued to negotiate minor revisions to the Merger Agreement, disclosure schedules and related documents through October 25, 2021.

On October 25, 2021, Latham provided Vinson & Elkins with a proposed execution version of the Merger Agreement that, among other things: (i) included the Final Offer as the Exchange Ratio and (ii) added certain materiality qualifiers to certain representations and warranties of PSXP.

On October 26, 2021, the Conflicts Committee and its financial and legal advisors held a conference call with representatives of Phillips 66 and its legal advisors to discuss certain final due diligence questions prepared on behalf of the Conflicts Committee. During the conference call, senior management representatives of Phillips 66 and PSXP answered each of the final due diligence questions and (i) generally confirmed that, to their knowledge, there were no material issues or developments relevant to the Conflicts Committee’s consideration of the Proposed Transaction that had not been previously disclosed to the Conflicts Committee and its financial and legal advisors and (ii) recommended that PSXP enter into the Proposed Transaction on the terms negotiated.

Following the due diligence call, the Conflicts Committee met with representatives of Evercore and Vinson & Elkins. Prior to the meeting, copies of the Merger Agreement, proposed Special Approval resolutions and the respective presentation materials of Evercore and Vinson & Elkins were delivered to the Conflicts Committee. Evercore reviewed its financial analysis of the Proposed Transaction at the Final Offer and provided the Conflicts Committee with its final valuation analysis with respect to the Proposed Transaction. Upon the request of the Conflicts Committee, Evercore then rendered its oral opinion, which was concurrently confirmed by delivery of a written opinion later that day, that, as of such date and on the basis and subject to the various assumptions, qualifications and limitations set forth in Evercore’s opinion, the Exchange Ratio set forth in the Merger Agreement was fair, from a financial point of view, to PSXP and the PSXP Public Unitholders. Following receipt of Evercore’s fairness opinion, Vinson & Elkins reviewed with the Conflicts Committee its duties under the Third A&R Partnership Agreement and applicable law with respect to the Proposed Transaction and summarized the provisions of the final draft of the Merger Agreement. After further discussion with Evercore and Vinson & Elkins, the Conflicts Committee (i) determined that the Merger, including the Merger Agreement and the transactions contemplated thereby, were in the best interests of PSXP and its subsidiaries and the PSXP Public Unitholders, (ii) approved the Merger, including the Merger Agreement and the transactions contemplated thereby (the foregoing constituting “Special Approval” as defined in the Third A&R Partnership Agreement), (iii) recommended to the GP Board the approval of the Merger Agreement and the execution, delivery and performance of the Merger Agreement and the transactions contemplated thereby, including the Merger, and (iv) resolved, and recommended to the GP Board that the GP Board resolve, to direct that the Merger Agreement be submitted to a vote of the PSXP Limited Partners.

Further on October 26, 2021, in a special meeting of the GP Board, the Conflicts Committee provided the GP Board with a report on the process of evaluating the Proposed Transaction, including (i) the hiring of Evercore and Vinson & Elkins as financial and legal advisors, respectively, (ii) the results of the price negotiations between Phillips 66 and the Conflicts Committee, (iii) the completion of the review conducted by Evercore, (iv) the receipt of the oral opinion of Evercore as described above, (v) the Conflicts Committee’s Special Approval of the Proposed Transaction and the Merger Agreement and (vi) the Conflicts Committee’s

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resolution, and recommendation to the GP Board that the GP Board resolve, to direct that the Merger Agreement be submitted to a vote of the PSXP Limited Partners. Prior to the meeting, copies of the Merger Agreement and proposed resolutions relating to the Merger were delivered to the GP Board. Following discussion between the GP Board and the Conflicts Committee with respect to its report and the terms of the Proposed Transaction and the Merger Agreement, the GP Board (acting, in part, based upon the receipt of such approval and recommendation of the Conflicts Committee), by unanimous vote (1) determined that the form, terms and provisions of the Merger Agreement are in the best interests of PSXP and the PSXP Limited Partners, (2) declared it advisable for PSXP to enter into the Merger Agreement and authorized and approved the execution, delivery and performance of the Merger Agreement and the consummation of the Proposed Transaction on the terms and subject to the conditions set forth in the Merger Agreement, (3) directed that the adoption of the Merger Agreement and the approval of the Merger be submitted to a vote of the PSXP Limited Partners and authorized the PSXP Limited Partners to act by written consent pursuant to the terms of the Third A&R Partnership Agreement and (4) approved the LPA Amendment and authorized the General Partner to propose the LPA Amendment and seek the approval of the LPA Amendment by written consent of the holders of the Series A Required Voting Percentage and a Unit Majority.

Later on October 26, 2021, the Phillips 66 Board convened a special meeting. At this meeting, Phillips 66 senior management provided an overview of the Proposed Transaction and the Phillips 66 Board’s fiduciary duties with respect to the Proposed Transaction. Prior to the meeting, copies of the Merger Agreement and proposed resolutions relating to the Merger were delivered to the Phillips 66 Board. Phillips 66 senior management then reviewed with the Phillips 66 Board the material terms of the Merger Agreement and other ancillary agreements. After discussion, the Phillips 66 Board, by unanimous vote, (i) determined that the execution, delivery and performance of the Merger Agreement and the transactions contemplated thereby, including the Merger and the issuance of the Phillips 66 Common Stock as merger consideration, were in the best interests of Phillips 66 and its stockholders, (ii) approved the Merger Agreement, the execution, delivery and performance of the Merger Agreement and the transactions contemplated thereby, including the Merger and the issuance of the Phillips 66 Common Stock as merger consideration, and (iii) authorized the execution and delivery of the Written Consent by P66 PDI.

Following the meetings of the Phillips 66 Board, the Conflicts Committee and the GP Board, Phillips 66, P66 PDI, Merger Sub and PSXP executed the Merger Agreement and Phillips 66 caused P66 PDI to deliver the Written Consent.

Later that evening, Richards Layton & Finger, P.A., Delaware counsel to the General Partner, delivered an opinion to the General Partner to the effect that the LPA Amendment will not affect the limited liability of any PSXP Limited Partner under applicable partnership law of the State of Delaware. Following receipt of such opinion, P66 PDI and Stonepeak SPV each executed and delivered the LPA Consent and the General Partner executed and delivered the LPA Amendment in accordance with the Third A&R Partnership Agreement.

On the morning of October 27, 2021, Phillips 66 and PSXP issued a joint press release announcing the execution of the Merger Agreement and the LPA Amendment.

Resolution of Conflicts of Interest; Standards of Conduct and Modification of Duties

The unanimous approval of the Merger, including the Merger Agreement and the transactions contemplated thereby, by the members of the Conflicts Committee constitutes “Special Approval” under the Third A&R Partnership Agreement. Under Section 7.9 of the Third A&R Partnership Agreement, whenever a potential conflict of interest exists or arises between the General Partner or any of its affiliates, on the one hand, and PSXP, any subsidiary or any partner of PSXP, on the other hand, any resolution or course of action by the General Partner or its affiliates in respect of such conflict of interest will be permitted and deemed approved by all of the partners of PSXP and will not constitute a breach of the Third A&R Partnership Agreement, any Group Member Agreement (as defined in the Third A&R Partnership Agreement), or any agreement contemplated

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therein or of any duty stated or implied by law or equity, if the resolution or course of action in respect of such conflict of interest is approved by Special Approval.

Under Section 7.10(b) of the Third A&R Partnership Agreement, any action taken or omitted to be taken by the General Partner in reliance upon the advice or opinion of an investment banker, among others, as to matters reasonably believed to be in such person’s professional or expert competence shall be conclusively presumed to have been taken or omitted to be taken in good faith and in accordance with such advice or opinion.

Phillips 66’s Rationale for the Transaction

At a meeting held on October 26, 2021, the Phillips 66 Board (i) determined that the Merger and the transactions contemplated thereby, including the Phillips 66 Stock Issuance, are in the best interests of Phillips 66 and the Phillips 66 Stockholders and (ii) authorized the negotiation, execution and delivery of the LPA Amendment and the consummation of the respective transactions contemplated thereby, including the Merger and the Phillips 66 Stock Issuance, on the terms and subject to the conditions set forth therein.

Phillips 66 considered the following factors as generally favorable with respect to the Merger and the transactions related thereto, including the Phillips 66 Stock Issuance:

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Phillips 66 viewed the following factors as generally negative or unfavorable in making a determination with respect to the Merger and the transactions related thereto, including the Phillips 66 Stock Issuance:

After taking into account all of the factors set forth above, as well as others, Phillips 66 concluded that the potential benefits of the Merger outweighed any negative or unfavorable considerations.

The foregoing discussion is not intended to be exhaustive, but it is intended to address the material information and principal factors considered by Phillips 66 in considering the Merger. In view of the number and variety of factors and the amount of information considered, Phillips 66 did not find it practicable to, and did not make specific assessments of, quantify or assign relative weights to, the specific factors considered in reaching its determination. In addition, Phillips 66 did not undertake to make any specific determination as to whether any particular factor, or any aspect of any particular factor, was favorable or unfavorable to its ultimate determination. Phillips 66 made its recommendation based on the totality of the information presented to, and the investigation conducted by, the Phillips 66 Board and Phillips 66 management. It should be noted that certain statements and other information presented in this section are forward-looking in nature and, therefore, should be read in light of the factors discussed under the heading “Cautionary Statement Regarding Forward-Looking Statements.”

Approval of the Conflicts Committee and the GP Board and their Reasons for the Merger

Conflicts Committee

The Conflicts Committee consists of two independent directors of the GP Board: Mark A. Haney and P. David Bairrington. The GP Board authorized the Conflicts Committee to (i) review and evaluate the terms and conditions of, and determine the advisability of, the Merger, including the Merger Agreement and the transactions contemplated thereby, for and on behalf of PSXP and the PSXP Public Unitholders; (ii) negotiate the terms and conditions of the Merger, including the Merger Agreement and the transactions contemplated thereby, for and on behalf of PSXP and the PSXP Public Unitholders; (iii) determine whether to approve the Merger, including the Merger Agreement and the transactions contemplated thereby (any such approval of the Merger, including the Merger Agreement and the transactions contemplated thereby to constitute “Special Approval” as defined in the Third A&R Partnership Agreement); and (iv) determine whether to recommend that the GP Board approve the Merger, including the Merger Agreement and the transactions contemplated thereby.

At a meeting held on October 26, 2021, the Conflicts Committee, by unanimous vote, in good faith, (a) determined that the Merger, including the Merger Agreement and the transactions contemplated thereby, are in the best interests of PSXP and its subsidiaries and the PSXP Public Unitholders, (b) approved the Merger, including the Merger Agreement and the transactions contemplated thereby (the foregoing constituting “Special

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Approval” as defined in the Third A&R Partnership Agreement), (c) recommended to the GP Board the approval of the Merger Agreement and the execution, delivery and performance of the Merger Agreement and the transactions contemplated thereby, including the Merger and (d) resolved, and recommended to the GP Board that the GP Board resolve, to direct that the Merger Agreement be submitted to a vote of the PSXP Limited Partners.

The Conflicts Committee retained Vinson & Elkins as its legal counsel and Evercore as its independent financial advisor. The Conflicts Committee oversaw the performance of financial and legal due diligence by its advisors. The Conflicts Committee also conducted a review and evaluation of the Merger, including the Merger Agreement and the transactions contemplated thereby, and conducted negotiations with Phillips 66 and its representatives with respect to the Merger, including the Merger Agreement and the transactions contemplated thereby.

The Conflicts Committee consulted with its financial and legal advisors and considered both positive and potentially negative factors in making its determination and approvals and the related recommendation to the GP Board.

The Conflicts Committee considered the following factors, the order of which does not necessarily reflect their relative significance, to be generally positive or favorable in making its determination and approvals and the related recommendation to the GP Board.

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The Conflicts Committee considered the following factors, the order of which does not necessarily reflect their relative significance, to be potentially negative or unfavorable in arriving at its determinations and approvals, and the related recommendation to the GP Board:

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In addition to the factors described above, the Conflicts Committee considered the following procedural factors, the order of which does not necessarily reflect their relative significance, in making its determination that

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the Merger Agreement and the transactions contemplated thereby are in the best interests of PSXP and the PSXP Public Unitholders:

After taking into account all of the factors set forth above, as well as others, the Conflicts Committee concluded that the potential benefits of the Merger outweighed any negative or unfavorable considerations and determined that the Merger Agreement and the transactions contemplated thereby are in the best interests of PSXP and the PSXP Public Unitholders.

The foregoing discussion is not intended to be exhaustive but is intended to address the material information and principal factors considered by the Conflicts Committee in considering the Merger Agreement and the transactions contemplated thereby. In view of the number and variety of factors and the amount of information considered, the Conflicts Committee did not find it practicable to, and did not make specific assessments of, quantify or otherwise assign relative weights to, the specific factors considered in reaching its determination. In addition, the Conflicts Committee did not undertake to make any specific determination as to whether any particular factor, or any aspect of any particular factor, was favorable or unfavorable to its ultimate determination, and the members of the Conflicts Committee may have given different weights to different factors. The Conflicts Committee made its recommendation based on the totality of the information reviewed by the Conflicts Committee. It should be noted that certain statements and other information presented in this section are forward-looking in nature and, therefore, should be read in light of the factors discussed under the heading “Cautionary Statement Regarding Forward-Looking Statements.”

GP Board

On October 26, 2021, the GP Board (acting, in part, based upon the receipt of such approval and recommendation of the Conflicts Committee), by unanimous vote (a) determined that the Merger Agreement and

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the transactions contemplated thereby, including the Merger, are in the best interests of PSXP and the PSXP Limited Partners, (b) authorized and approved the execution, delivery and performance of the Merger Agreement and the transactions contemplated thereby, including the Merger, (c) directed that the Merger Agreement be submitted to a vote of the PSXP Limited Partners and (d) authorized the PSXP Limited Partners to act by written consent pursuant to the terms of the Third A&R Partnership Agreement.

Unaudited Financial Forecasts Relating to PSXP

In connection with the proposed Merger, Phillips 66 management prepared forecasts relating to PSXP (without giving effect to the Merger) that included non-public historical and projected financial data relating to PSXP (the “Forecasts”). The Forecasts were provided to Evercore for its use and consideration in its financial analysis in preparation of its opinion to the Conflicts Committee. The Forecasts assumed a reduction in quarterly distributions by fifty percent (50%), and contained an upper and lower-case based on whether DAPL is online or offline.

The summary of these Forecasts is being included in this information statement/prospectus to give PSXP Public Unitholders access to non-public information that was provided to the GP Board, the Conflicts Committee and the Conflict Committee’s financial advisor in the course of evaluating the Merger. The inclusion of this information should not be regarded as an indication that any of Phillips 66, PSXP, the General Partner or its advisors or other representatives or any other recipient of this information considered, or now considers, it to be necessarily predictive of actual future performance or events, or that it should be construed as financial guidance, and such Forecasts set forth below should not be relied on as such.

The Forecasts were not prepared with a view toward public disclosure, nor were they prepared with a view toward compliance with generally accepted accounting principles in the United States (“GAAP”), published guidelines of the SEC or the guidelines established by the American Institute of Certified Public Accountants for preparation and presentation of prospective financial information. Neither Ernst & Young LLP, Phillips 66’s and PSXP’s respective independent registered public accounting firm, nor any other independent accountants, have compiled, examined or performed any procedures with respect to the unaudited prospective financial and operating information contained herein, nor have they expressed any opinion or any other form of assurance on such information or its achievability.

The prospective financial information included in this document has been prepared by, and is the responsibility of Phillips 66’s management. Neither Ernst & Young LLP, nor any other independent accountants, have audited, reviewed, examined, compiled nor applied agreed-upon procedures with respect to the accompanying prospective financial information and, accordingly, Ernst & Young LLP, nor any other independent accountants, have expressed an opinion or any other form of assurance with respect thereto. The reports of Ernst & Young LLP, Deloitte & Touche LLP, and Grant Thornton LLP incorporated by reference in this document relate to either Phillips 66’s or PSXP’s previously issued financial statements. These reports do not extend to the forecasted financial information and should not be read to do so.

Furthermore, the Forecasts do not take into account any circumstances or events occurring after the date they were prepared. None of Phillips 66, PSXP nor the General Partner can give assurance that, had the Forecasts been prepared as of the date of this information statement/prospectus, similar estimates and assumptions would be used. Except as required by applicable securities laws, Phillips 66, PSXP and the General Partner do not intend to, and disclaim any obligation to, make publicly available any update or other revision to the Forecasts to reflect circumstances existing since their preparation or to reflect the occurrence of unanticipated events, even in the event that any or all of the underlying assumptions are shown to be in error or to reflect changes in general economic or industry conditions. The Forecasts do not take into account all the possible financial and other effects on PSXP of the Merger, the effect on PSXP of any business or strategic decision or action that has been or will be taken as a result of the Merger Agreement having been executed, or the effect of any business or strategic decisions or actions that would likely have been taken if the Merger Agreement had not been executed, but which

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were instead altered, accelerated, postponed or not taken in anticipation of the Merger. Further, the Forecasts do not take into account the effect on PSXP of any possible failure of the Merger to occur. None of Phillips 66, PSXP, the General Partner or their affiliates, officers, directors, advisors or other representatives has made, makes or is authorized in the future to make any representation to any PSXP Public Unitholder or other person regarding PSXP’s ultimate performance compared to the information contained in the Forecasts or to the effect that the future financial and operating performance set forth in the Forecasts will be achieved. The inclusion of the Forecasts herein should not be deemed an admission or representation by Phillips 66, PSXP, the General Partner or their advisors or any other person that it is viewed as material information of PSXP, particularly in light of the inherent risks and uncertainties associated with such Forecasts.

Opinion of Evercore – Financial Advisor to the Conflicts Committee

The Conflicts Committee retained Evercore to act as its financial advisor in connection with evaluating the proposed Merger. On October 26, 2021, at a meeting of the Conflicts Committee, Evercore rendered its oral opinion (subsequently confirmed by delivery of a written opinion on the same date) that, as of October 26, 2021 and based upon and subject to the factors, assumptions made, procedures followed, matters considered, qualifications and limitations on the scope of review undertaken by Evercore in connection with the preparation of its opinion as set forth therein, the Exchange Ratio pursuant to the Merger Agreement was fair, from a financial point of view, to PSXP and the PSXP Public Unitholders.

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The opinion speaks only as of the date it was delivered and not as of the time the Merger will be completed or any other date. The opinion does not reflect changes that may occur or may have occurred after October 26, 2021, which could alter the facts and circumstances on which Evercore’s opinion was based. It is understood that subsequent events may affect Evercore’s opinion, but Evercore does not have any obligation to update, revise or reaffirm its opinion.

The full text of the written opinion of Evercore, dated as of October 26, 2021, which sets forth, among other things, the procedures followed, assumptions made, matters considered and qualifications and limitations on the scope of review undertaken in rendering its opinion, is attached hereto as Annex B and is incorporated for reference in its entirety in this information statement/prospectus. You are urged to read Evercore’s opinion carefully and in its entirety. Evercore’s opinion was addressed to, and provided information for the benefit of, the Conflicts Committee in connection with its evaluation of the fairness of the Exchange Ratio to PSXP and the PSXP Public Unitholders, and did not address any other aspects or implications of the Merger. Evercore’s opinion should not be construed as creating any fiduciary duty on Evercore’s part to any party and such opinion is not intended to be, and does not constitute, a recommendation to the Conflicts Committee or to any other persons in respect to the Merger, including as to how any PSXP Public Unitholders should act or vote in respect to the Merger. The summary of the Evercore opinion set forth herein is qualified in its entirety by reference to the full text of the opinion included as Annex B. Evercore’s opinion speaks as of the date rendered, and Evercore has no obligation to update, revise or reaffirm its opinion.

In connection with rendering its opinion and performing its related financial analysis, Evercore, among other things:

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For purposes of Evercore’s analysis and opinion, Evercore assumed and relied upon, without undertaking any independent verification of, the accuracy and completeness of all of the information publicly available and all of the information supplied or otherwise made available to, discussed with or reviewed by Evercore and upon the assurances of the managements of PSXP and Phillips 66 that they were not aware of any relevant information that was omitted or that remained undisclosed to Evercore or facts and circumstances that would make such information inaccurate or misleading, and Evercore assumes no liability therefor. With respect to the Forecasts, Evercore assumed that such data had been reasonably prepared on bases reflecting the best currently available estimates and good faith judgments of the management of Phillips 66 as to the future financial performance of PSXP under the assumptions therein. At the direction of the Conflicts Committee, Evercore reviewed a sensitivity case based on the Forecasts and assuming DAPL remains offline for a period of two years before resuming service. The forecasted Adjusted EBITDA in this sensitivity case was identical to that of the DAPL Offline case for 2021E and 2022E, and identical to that of the DAPL Online case for 2024E, 2025E, and 2026E, with 2023E Adjusted EBITDA of $1,344 million falling in between the 2023E Adjusted EBITDA for the DAPL Offline and DAPL Online cases. The resulting Distributable Cash Flow for the sensitivity case for 2021E, 2022E, 2023E, 2024E, 2025E and 2026E was $820 million, $815 million, $980 million, $1,162 million, $1,223 million, and $1,285 million, respectively.

For purposes of rendering its opinion, Evercore assumed, in all respects material to its analysis, that the representations and warranties of each party contained in the Merger Agreement, when executed, would be true and correct at the time of execution, that each party would perform all of the covenants and agreements required to be performed by it under the Merger Agreement and that all conditions to the consummation of the Merger would be satisfied without material waiver or modification thereof. Evercore further assumed that all governmental, regulatory or other consents, approvals or releases necessary for the consummation of the Merger would be obtained without any material delay, limitation, restriction or condition that would have an adverse effect on PSXP, Phillips 66 or the consummation of the Merger, or materially reduce the benefits of the Merger to the PSXP Public Unitholders. Evercore assumed that the parties would execute the final versions of all documents reviewed by it in draft form and that such documents would conform in all material respects to the drafts reviewed by Evercore.

Evercore did not conduct a physical inspection of the properties or facilities of PSXP or Phillips 66, and Evercore did not make, nor assume any responsibility for any independent valuation or appraisal of the assets or liabilities of PSXP or Phillips 66, nor was Evercore furnished with any such appraisals, nor did Evercore evaluate the solvency or fair value of PSXP or Phillips 66 under any state or federal laws relating to bankruptcy, insolvency or similar matters. Evercore’s opinion was necessarily based upon information made available to Evercore as of the date of the opinion and financial, economic, market and other conditions and circumstances as they existed and as could be evaluated on the date of the opinion. It is understood that subsequent developments may affect Evercore’s opinion and that Evercore does not have any obligation to update, revise or reaffirm its opinion.

Evercore expressed no opinion with respect to any matter other than whether the Exchange Ratio was fair, from a financial point of view, to PSXP and the PSXP Public Unitholders. Evercore’s opinion did not express any opinion as to the structure, terms (other than the financial terms) or effect of any other aspect of the Merger, including, without limitation, the tax consequences of the Merger or the corporate governance changes occurring in connection therewith except to the extent that such changes constituted financial terms of the Merger. Evercore’s opinion did not express any view on, and its opinion does not address, the fairness of any individual element of the Merger Agreement, other than the Exchange Ratio. Further, Evercore’s opinion does not address the fairness to the holders of securities (other than the PSXP Public Unitholders), creditors or other constituencies of PSXP or Phillips 66.

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Evercore’s opinion did not address the relative merits of the Merger as compared to other business or financial strategies that might have been available to PSXP or Phillips 66, nor did it address the underlying business decision of PSXP to engage in the Merger. In arriving at its opinion, Evercore was not authorized to solicit, and did not solicit, interest from any third party with respect to any business combination or other extraordinary transaction involving PSXP or Phillips 66, or any of their respective affiliates. Evercore’s opinion did not constitute a recommendation to the Conflicts Committee or to any other persons in respect to the Merger, including as to how any PSXP Public Unitholders should vote in respect to the Merger. Evercore expressed no opinion as to what the value of the Merger Consideration actually will be when issued or the prices at which the PSXP Common Units or Phillips 66 Common Stock would trade at any time, including following announcement or consummation of the Merger. Evercore’s opinion did not address the potential effects of volatility in the credit, financial and stock markets on PSXP or Phillips 66 or the Merger or as to the impact of the Merger on the solvency or viability of PSXP or Phillips 66 or the ability of PSXP or Phillips 66 to pay its obligations when they come due. Evercore is not a legal, regulatory, accounting or tax expert and assumed the accuracy and completeness of assessments by management of PSXP and its advisors with respect to legal, regulatory, accounting and tax matters.

Set forth below is a summary of the material financial analyses performed by Evercore and reviewed with the Conflicts Committee on October 26, 2021 in connection with rendering Evercore’s opinion to the Conflicts Committee. Each analysis was provided to the Conflicts Committee. However, the following summary does not purport to be a complete description of the analyses performed by Evercore. In connection with arriving at its opinion, Evercore considered all of its analyses as a whole, and the order of the analyses described and the results of these analyses do not represent any relative importance or particular weight given to these analyses by Evercore. Except as otherwise noted, the following quantitative information, to the extent that it is based on market data, is based on market data that existed on October 25, 2021, and is not necessarily indicative of current market conditions.

Overview of Analyses

Discounted Cash Flow Analysis

Evercore performed a discounted cash flow analysis of PSXP by valuing the cash flows received by PSXP based on the Forecasts during a five-year period under three different case scenarios: (i) DAPL Online, (ii) DAPL Offline and (iii) DAPL Sensitivity (the “Respective Cases”). All figures stated herein related to the Respective Cases will appear in the order set forth in the immediately preceding sentence. Evercore calculated the per PSXP Common Unit value range for the PSXP Common Units and an implied Exchange Ratio range utilizing the calculated PSXP Common Unit range and (i) the closing price for Phillips 66 Common Stock as of October 25, 2021 and (ii) the minimum and maximum of Phillips 66 Common Stock’s trailing 10-day daily VWAP as of October 25, 2021. Evercore derived values for the PSXP Common Units utilizing a range of discount rates based on PSXP’s weighted average cost of capital, as estimated by Evercore based on the Capital Asset Pricing Model (“CAPM”) and terminal values based on a range of estimated Adjusted EBITDA exit multiples as well as perpetuity growth rates. Evercore assumed a range of discount rates of 6.0% to 7.0%, a range of Adjusted EBITDA exit multiples of 8.0x to 10.0x and a range of perpetuity growth rates of 0.00% to 1.00%. The discounted cash flow analysis utilizing the Adjusted EBITDA exit multiple methodology to calculate terminal value resulted in an implied equity value per PSXP Common Unit range of $36.56 to $49.53, $25.07 to $35.59, and $34.57 to $47.53 for the Respective Cases. The discounted cash flow analysis utilizing the perpetuity growth rate methodology to calculate terminal value resulted in an implied equity value per PSXP Common Unit range of $39.26 to $59.54, $26.54 to $42.66, and $37.28 to $57.54 for the Respective Cases.

Evercore compared the PSXP Common Unit value ranges to the Phillips 66 Common Stock closing price as of October 25, 2021 and noted that the analysis utilizing the Adjusted EBITDA exit multiple methodology indicated a range of implied Exchange Ratios of 0.44x to 0.59x, 0.30x to 0.43x, and 0.41x to 0.57x for the Respective Cases. Evercore compared the PSXP Common Unit value ranges to the minimum and maximum of

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Phillips 66 Common Stock’s trailing 10-day daily VWAP as of October 25, 2021 and noted that the analysis utilizing the Adjusted EBITDA exit multiple methodology indicated a range of implied Exchange Ratios of 0.44x to 0.61x, 0.30x to 0.44x, and 0.42x to 0.59x for the Respective Cases. Evercore compared the PSXP Common Unit value ranges to Phillips 66 Common Stock’s closing price as of October 25, 2021 and noted that the analysis utilizing the perpetuity growth rate methodology indicated a range of implied Exchange Ratios of 0.47x to 0.71x, 0.32x to 0.51x, and 0.45x to 0.69x for the Respective Cases. Evercore compared the PSXP Common Unit value ranges to the minimum and maximum of Phillips 66 Common Stock’s trailing 10-day daily VWAP as of October 25, 2021 and noted that the analysis utilizing the perpetuity growth rate methodology indicated a range of implied Exchange Ratios of 0.47x to 0.73x, 0.32x to 0.53x, and 0.45x to 0.71x for the Respective Cases.

Discounted Distributions Analysis

Evercore performed a discounted distributions analysis to value the PSXP Common Units based on the present value of future cash distributions to holders of PSXP Common Units. Evercore utilized a terminal yield range of 8.0% to 10.0%, a cost of equity of 7.0% to 9.0% based on CAPM and a cost of equity of 9.0% to 11.0% based on total expected market return for MLPs owning assets and businesses similar to those owned by PSXP. Utilizing the cost of equity based on CAPM, Evercore determined an implied value per PSXP Common Unit range of $19.81 to $24.78 for each of the Respective Cases. Utilizing the cost of equity based on total expected market return, Evercore determined an implied value per PSXP Common Unit range of $18.37 to $22.86 for each of the Respective Cases.

Evercore compared the PSXP Common Unit value ranges to the Phillips 66 Common Stock closing price as of October 25, 2021 and noted that the analysis utilizing the cost of equity based on CAPM indicated a range of implied Exchange Ratios of 0.24x to 0.30x for each of the Respective Cases. Evercore compared the PSXP Common Unit value ranges to the minimum and maximum of Phillips 66 Common Stock’s trailing 10-day daily VWAP as of October 25, 2021 and noted that the analysis utilizing the cost of equity based on CAPM indicated a range of implied Exchange Ratios of 0.24x to 0.31x for each of the Respective Cases. Evercore compared the PSXP Common Unit value ranges to the Phillips 66 Common Stock closing price as of October 25, 2021 and noted that the analysis utilizing the cost of equity based on total expected market return indicated a range of implied Exchange Ratios of 0.22x to 0.27x for each of the Respective Cases. Evercore compared the PSXP Common Unit value ranges to the minimum and maximum of Phillips 66 Common Stock’s trailing 10-day daily VWAP as of October 25, 2021 and noted that the analysis utilizing the cost of equity based on total expected market return indicated a range of implied Exchange Ratios of 0.22x to 0.28x for each of the Respective Cases.

Peer Group Trading Analysis

Evercore performed a peer group trading analysis of PSXP by reviewing and comparing the market values and trading multiples of the following publicly traded MLPs that Evercore deemed to have certain characteristics that are similar to those of PSXP:

Crude Oil and Refined Products MLPs:

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Although the peer group trading partnerships were compared to PSXP for purposes of this analysis, no partnership used in the peer group trading analysis is identical or directly comparable to PSXP. In order to calculate peer group trading multiples, Evercore relied on publicly available filings with the SEC and equity research analyst estimates.

For each of the peer group trading partnerships, Evercore calculated the following trading multiples:

Enterprise Value/2022E EBITDA, which is defined as market value of equity, plus debt, non-controlling interest and preferred equity, less cash (“Enterprise Value” or “EV”), divided by estimated EBITDA for the calendar year 2022; and

Enterprise Value/2023E EBITDA, which is defined as Enterprise Value divided by estimated EBITDA for the calendar year 2023.

The mean and median trading multiples are set forth below. The table also includes relevant multiple ranges selected by Evercore based on the resulting range of multiples and certain other considerations related to the specific characteristics of PSXP noted by Evercore.

Based on its review of the peer group trading partnerships and Evercore’s professional judgment, Evercore selected Enterprise Value multiple ranges of 8.0x to 10.0x to 2022E EBITDA and 7.5x to 9.5x to 2023E EBITDA.

Evercore applied the relevant multiple ranges to 2022E and 2023E Adjusted EBITDA of the Respective Cases to derive a relevant Enterprise Value ranges. After adjusting for net debt, preferred equity, noncontrolling interest and units outstanding as of September 30, 2021, Evercore determined implied value per PSXP Common Unit ranges of $29.66 to $42.40, $19.71 to $29.96, and $19.71 to $29.96 for the Respective Cases using 2022E Adjusted EBITDA and $27.61 to $40.64, $18.10 to $28.60, and $22.85 to $34.62 for the Respective Cases using 2023E Adjusted EBITDA.

Evercore compared the PSXP Common Unit value ranges to the Phillips 66 Common Stock closing price as of October 25, 2021 and noted that the implied Exchange Ratios using the selected EV/2022E EBITDA multiple range were 0.35x to 0.51x, 0.24x to 0.36x, and 0.24x to 0.36x for the Respective Cases. Evercore compared the PSXP Common Unit value ranges to the minimum and maximum of Phillips 66 Common Stock’s trailing 10-day daily VWAP as of October 25, 2021 and noted that the implied Exchange Ratios using the selected EV/2022E

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EBITDA multiple range were 0.35x to 0.52x, 0.24x to 0.37x, and 0.24x to 0.37x for the Respective Cases. Evercore compared the PSXP Common Unit value ranges to the Phillips 66 Common Stock closing price as of October 25, 2021 and noted that the implied Exchange Ratios using the selected EV/2023E EBITDA multiple range were 0.33x to 0.49x, 0.22x to 0.34x, and 0.27x to 0.41x for the Respective Cases. Evercore compared the PSXP Common Unit value ranges to the minimum and maximum of Phillips 66 Common Stock’s trailing 10-day daily VWAP as of October 25, 2021 and noted that the implied Exchange Ratios using the selected EV/2023E EBITDA multiple range were 0.33x to 0.50x, 0.22x to 0.35x, and 0.28x to 0.43x for the Respective Cases.

The median and mean Enterprise Value to EBITDA multiple of the selected 20 transactions was 9.8x and 9.9x, respectively.

Evercore reviewed the Enterprise Value to EBITDA multiples in the selected transactions and selected a range of relevant implied multiples of EBITDA of 8.5x to 11.0x. Evercore then applied this range of selected multiples to the 2021E EBITDA for the Respective Cases. After adjusting for net debt, preferred equity and noncontrolling interest as of September 30, 2021, Evercore determined implied value per PSXP Common Unit ranges of $28.31 to $42.89, $23.02 to $36.05, and $23.02 to $36.05 for the Respective Cases.

Evercore compared the PSXP Common Unit value ranges to the Phillips 66 Common Stock closing price as of October 25, 2021 and noted that the analysis indicated a range of implied Exchange Ratios of 0.34x to 0.51x,

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0.27x to 0.43x, and 0.27x to 0.43x for the Respective Cases. Evercore compared the PSXP Common Unit value ranges to the minimum and maximum of Phillips 66 Common Stock’s trailing 10-day daily VWAP as of October 25, 2021 and noted that the analysis indicated a range of implied Exchange Ratios of 0.34x to 0.53x, 0.28x to 0.44x, and 0.28x to 0.44x for the Respective Cases.

General

The foregoing summary of certain material financial analyses does not purport to be a complete description of the analyses or data presented by Evercore. In connection with the review of the transaction, Evercore performed a variety of financial and comparative analyses for purposes of rendering its opinion to the Conflicts Committee. The preparation of a fairness opinion is a complex process and is not necessarily susceptible to partial analysis or summary description. Selecting portions of the analyses or of the summary described above, without considering the analysis as a whole, could create an incomplete view of the processes underlying Evercore’s opinion. In arriving at its fairness determination, Evercore considered the results of all the analyses and did not draw, in isolation, conclusions from or with regard to any one analysis or factor considered by it for purposes of its opinion. Rather, Evercore made its determination as to fairness on the basis of its experience and professional judgment after considering the results of all the analyses. In addition, Evercore may have given various analyses and factors more or less weight than other analyses and factors, and may have deemed various assumptions more or less probable than other assumptions. As a result, the ranges of valuations resulting from any particular analysis or combination of analyses described above should not be taken to be the view of Evercore with respect to the Exchange Ratio. No partnership used in the above analyses as a comparison is directly comparable to PSXP and no precedent M&A transaction analyzed in the above analysis is directly comparable to the Merger. Furthermore, Evercore’s analyses involve complex considerations and judgments concerning financial and operating characteristics and other factors that could affect the acquisition, public trading or other values of the partnerships or transactions used, including judgments and assumptions with regard to industry performance, general business, economic, market and financial conditions and other matters, many of which are beyond the control of Phillips 66, PSXP and their respective advisors.

Evercore prepared these analyses solely for the information and benefit of the Conflicts Committee and for the purpose of providing an opinion to the Conflicts Committee as to whether the Exchange Ratio was fair, from a financial point of view, to PSXP and the PSXP Public Unitholders. These analyses do not purport to be appraisals or to necessarily reflect the prices at which the business or securities actually may be sold. Any estimates contained in these analyses are not necessarily indicative of actual future results, which may be significantly more or less favorable than those suggested by such estimates. Accordingly, estimates used in, and the results derived from, Evercore’s analyses are inherently subject to substantial uncertainty and Evercore assumes no responsibility if future results are materially different from those forecasted in such estimates. The issuance of the opinion was approved by an internal fairness committee of Evercore.

Except as described above, the Conflicts Committee imposed no other instruction or limitation on Evercore with respect to the investigations made or the procedures followed by Evercore in rendering its opinion. The terms and conditions of the Merger Agreement and the related terms and conditions of the transaction were determined through arm’s-length negotiations between the Conflicts Committee and the management of Phillips 66. Evercore did not recommend any specific consideration to the Conflicts Committee or recommend that any specific consideration constitutes the only appropriate consideration in the Merger. Evercore’s opinion was only one of many factors considered by the Conflicts Committee in its evaluation of the Merger and should not be viewed as determinative of the views of the Conflicts Committee with respect to the Merger or the Exchange Ratio.

Under the terms of Evercore’s engagement letter with the Conflicts Committee, PSXP agreed to pay Evercore a fee of $3.0 million payable upon delivery of Evercore’s opinion. Evercore also received a fee of $250,000 upon execution of its engagement letter with the Conflicts Committee, which is fully creditable against the fee payable upon delivery of Evercore’s opinion. In addition, PSXP agreed to reimburse Evercore for its

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reasonable out-of-pocket expenses (including legal fees, expenses and disbursements) incurred in connection with its engagement and to indemnify Evercore and any of its members, officers, directors, advisors, representatives, employees, agents, affiliates or controlling persons, if any, against certain liabilities and expenses arising out of or in connection with its engagement.

During the two-year period prior to the date hereof and except as described herein, no material relationship existed between Evercore and PSXP, the General Partner, Phillips 66 or any other party to the Merger Agreement pursuant to which compensation was received by Evercore or its affiliates as a result of such a relationship, other than the Conflicts Committee’s February 2020 engagement of Evercore as its financial advisor in respect to the acquisition of Liberty Pipeline from Phillips 66 and/or its affiliates, for which services Evercore received total fees of $0.4 million and reimbursement of certain expenses.

Evercore and its affiliates engage in a wide range of activities for their own accounts and the accounts of their customers. In connection with these businesses or otherwise, Evercore and its affiliates and/or their respective employees, as well as investment funds in which any of them may have a financial interest, may at any time, directly or indirectly, hold long or short positions and may trade or otherwise effect transactions for their own accounts or the accounts of their customers, in debt or equity securities, senior loans and/or derivative products relating to Phillips 66 or PSXP and their respective affiliates.

Interests of Certain Persons in the Merger

PSXP Limited Partners should be aware that PSXP is controlled by Phillips 66 through its indirect ownership of the General Partner. The General Partner owns all of the outstanding general partner interests in PSXP. As a result, Phillips 66 controls who is appointed to the GP Board and thereby could be seen as controlling all of PSXP’s decisions, other than those involving certain conflicts of interest with Phillips 66 or that require an affirmative vote of the PSXP Limited Partners pursuant to the Third A&R Partnership Agreement. In addition, as of January 18, 2022, Phillips 66 beneficially owned 169,760,137 PSXP Common Units, which represents approximately 74.3% of the outstanding PSXP Common Units.

Existing Relationships of Phillips 66 Officers with PSXP

Certain persons associated with Phillips 66 (or one of its subsidiaries) have a relationship with PSXP. Phillips 66 controls the General Partner as its sole member. Through its ownership of all of the limited liability company interests in the General Partner, Phillips 66 elects all members of the GP Board. Accordingly, Phillips 66 has appointed to the GP Board, and has the ability to remove from the GP Board, each of the directors of the General Partner, including, subject to the terms of the Merger Agreement restricting the removal of the Conflicts Committee members during the pendency of the Merger Agreement, each of the members of the Conflicts Committee.

In addition, certain of the directors and executive officers of the General Partner also serve as directors and/or officers of Phillips 66 (or one of its subsidiaries).

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The following table sets forth, as of January 21, 2022, the beneficial ownership of Phillips 66 Common Stock and PSXP Public Common Units held by: (1) any person known by Phillips 66 and PSXP to be the beneficial owner of more than 5% of the outstanding shares of Phillips 66 Common Stock or PSXP Public Common Units; (2) the directors and named executive officers of Phillips 66, individually, and the directors and executive officers as a group; and (3) the directors and named executive officers of the General Partner, individually, and the directors and executive officers as a group. The percentages of ownership in the table are based on 438,413,964 shares of Phillips 66 Common Stock outstanding and 228,340,146 PSXP Common Units outstanding as of January 18, 2022.

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Golden Parachute Compensation

No executive officer or director of the General Partner is entitled to or will receive any severance payments or “golden parachute compensation” in connection with Merger.

No Dissenters’ or Appraisal Rights

PSXP Public Unitholders will not have dissenters’ or appraisal rights in connection with the Merger under applicable law or contractual appraisal rights under the Third A&R Partnership Agreement or the Merger Agreement.

Regulatory Matters

In connection with the Merger, Phillips 66 and PSXP each intends to make all required filings under the Securities Act and the Exchange Act, as well as any required filings or applications with the NYSE. Phillips 66 and PSXP are unaware of any other requirement for the filing of information with, or the obtaining of the approval of, governmental authorities in any jurisdiction that is required for the consummation of the Merger.

The Merger is not reportable under the HSR Act, and therefore, no filings with respect to the Merger were required with the FTC or the DOJ.

Listing of the Phillips 66 Common Stock to be Issued in the Merger; Delisting and Deregistration of the PSXP Common Units

Phillips 66 expects to obtain approval to list the shares of Phillips 66 Common Stock to be issued pursuant to the Merger Agreement on the NYSE, which approval is a condition to the Closing, subject to official notice of issuance. Upon completion of the Merger, the PSXP Common Units will cease to be listed on the NYSE and will be subsequently deregistered under the Exchange Act.

Post-Closing Status of PSXP

After the consummation of the Merger, it is expected that PSXP will remain an indirect, wholly owned subsidiary of Phillips 66 indefinitely. There are no definite plans to reorganize or transfer PSXP or any of its assets immediately following the Closing as of the date of this information statement/ prospectus.

Accounting Treatment

The Merger will be accounted for in accordance with Financial Accounting Standards Board Accounting Standards Codification 810, Consolidation—Overall—Changes in a Parent’s Ownership Interest in a Subsidiary. As Phillips 66 controls PSXP and will continue to control PSXP after the Merger, the change in Phillips 66’s ownership interest in PSXP will be accounted for as an equity transaction, and no gain or loss will be recognized in Phillips 66’s consolidated statement of operations resulting from the Merger.

In addition, after the Closing, Phillips 66 will no longer reflect the ownership interest previously held by the unitholders of PSXP Public Common Units and PSXP’s Series A Preferred Units as noncontrolling interests on Phillips 66’s consolidated balance sheet nor will Phillips 66 attribute a portion of PSXP’s net income to these former unitholders on its consolidated statement of operations.

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Litigation Relating to the Merger

On December 16, 2021, counsel of a purported PSXP Public Unitholder delivered a demand letter to counsel of the Conflicts Committee alleging that the information statement/prospectus filed by Phillips 66 on December 10, 2021 in connection with the proposed Merger omits material information with respect to the Merger. The letter requested that Phillips 66 provide supplemental disclosure in an amendment to the information statement/prospectus.

On December 21, 2021, a purported PSXP Public Unitholder filed a lawsuit, entitled Shiva Stein v. Phillips 66 Partners LP, et al., in the United States District Court for the Southern District of New York. On December 23, 2021, a purported PSXP Public Unitholder filed a lawsuit, entitled Shane Phillips v. Phillips 66 Partners LP, et al., in the United States District Court for the Southern District of New York. On December 28, 2021, a purported PSXP Public Unitholder filed a lawsuit, entitled Leo Diaz v. Phillips 66 Partners LP, et al., in the United States District Court for the Southern District of New York. On January 6, 2022, a purported PSXP Public Unitholder filed a lawsuit, entitled Stephen Bushansky v. Phillips 66 Partners LP, et al., in the United States District Court for the Southern District of New York. On January 19, 2022, a purported PSXP Public Unitholder filed a lawsuit, entitled Gerald Joseph Lovoi v. Phillips 66 Partners LP, et al., in the United States District Court for the Southern District of New York. The plaintiffs in each lawsuit allege that the information statement/prospectus filed by Phillips 66 with the SEC on December 10, 2021, in connection with the proposed Merger contains materially incomplete and misleading information and omits material information with respect to the Merger, rendering the information statement/prospectus materially incomplete and misleading in violation of Sections 14(a), 14(c), and 20(a) of the Exchange Act, Rules 14a-9 and 14c-6 of the SEC rules, and/or 17 C.F.R. § 244.100. Each plaintiff seeks, among other things, injunctive relief until the defendants to the applicable lawsuit disclose the alleged omitted material information.

Phillips 66 and PSXP believe that the claims asserted in the demand letter and in these lawsuits are without merit and intend to defend against all claims asserted. Additional lawsuits arising out of or relating to the Merger Agreement and the transactions contemplated thereby may be filed in the future.

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THE MERGER AGREEMENT

This section of this information statement/prospectus describes the material provisions of the Merger Agreement, but does not describe all of the terms of the Merger Agreement and may not contain all of the information about the Merger Agreement that is important to you. The following summary is qualified by reference to the complete text of the Merger Agreement, which is attached as Annex A to this information statement/prospectus and incorporated by reference herein. You are urged to read the full text of the Merger Agreement because it is the legal document that governs the Merger.

The Merger Agreement and this summary of its terms have been included to provide you with information regarding the terms of the Merger Agreement, and this summary is qualified in its entirety by the terms and conditions of the Merger Agreement. It is not intended to provide any other factual information about Phillips 66, PSXP, the General Partner or their respective subsidiaries and affiliates. The Merger Agreement contains representations and warranties by each of the parties to the Merger Agreement that were made only for purposes of the Merger Agreement and as of specified dates. The representations, warranties and covenants in the Merger Agreement were made solely for the benefit of the parties to the Merger Agreement, may be subject to limitations agreed upon by the contracting parties, including being qualified by confidential disclosures made for the purposes of allocating contractual risk between the parties to the Merger Agreement instead of establishing these matters as facts, and may be subject to standards of materiality applicable to the contracting parties that differ from those applicable to investors. You should not rely on the representations, warranties and covenants or any descriptions thereof as characterizations of the actual state of facts or condition of Phillips 66, PSXP, the General Partner or any of their respective subsidiaries or affiliates. Moreover, information concerning the subject matter of the representations, warranties and covenants may have changed after the date of the Merger Agreement, which subsequent information may or may not be fully reflected in Phillips 66’s or PSXP’s public disclosures incorporated by reference in this information statement/prospectus. Capitalized terms used but not defined in this section shall have the respective meanings given to them in the Merger Agreement.

The Merger; Effective Time; Closing

Subject to the terms and conditions of the Merger Agreement and in accordance with Delaware law, at the Effective Time, Merger Sub will merge with and into PSXP, with PSXP continuing as the surviving entity and an indirect, wholly owned subsidiary of Phillips 66.

At the Effective Time, subject to any applicable withholding tax, (i) the PSXP Public Common Units outstanding immediately prior to the Effective Time (including any PSXP Common Units that are issued or issuable to any holder of Series A Preferred Units as of the Effective Time pursuant to the Third A&R Partnership Agreement) will be converted into the right to receive the Merger Consideration; (ii) each Partnership LTIP Award, other than the Director LTIP Awards, whether or not vested, will cease to relate to or represent any right to receive a PSXP Common Unit and shall be converted, at the Effective Time, into an award of restricted stock units relating to a number of shares of Phillips 66 Common Stock equal to the product of (A) the number of PSXP Common Units subject to the corresponding Partnership LTIP Award as of immediately prior to the Effective Time, multiplied by (B) the Exchange Ratio, rounded up to the nearest whole share, on the same terms and conditions as were applicable to the corresponding Partnership LTIP Award, including any applicable payment timing provisions and dividend equivalent rights, as applicable, except as adjusted pursuant to the Merger Agreement; and (iii) each Director LTIP Award will become fully vested and automatically converted into the right to receive, with respect to each PSXP Common Unit subject thereto, the Merger Consideration (or, to the extent set forth under the terms of the applicable Director LTIP Award, cash in an amount equal to the value of the Merger Consideration determined based on the closing price of a share of Phillips 66 Common Stock on the NYSE as reported by Bloomberg L.P., or, if not reported therein, in another authoritative source mutually selected by Phillips 66 and the General Partner as of the Closing Date), plus any accrued but unpaid amounts in relation to distribution equivalent rights, in accordance with the applicable payment timing provisions set forth in the award agreement evidencing such Director LTIP Award (and, if such

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right is payable in the form of the Merger Consideration, then such right shall include dividend equivalent rights relating to dividends declared with respect to Phillips 66 Common Stock during the period beginning at the Effective Time and ending on the date of settlement of such Director LTIP Award). The conversion of a Director LTIP Award as provided in clause (iii) of the immediately preceding sentence shall be deemed a release of any and all rights the holder thereof had or may have had in respect of such Director LTIP Award, other than from and after the Effective Time, the right to receive the Merger Consideration (or cash as described in such clause, as applicable) plus any accrued but unpaid amounts in relation to distribution equivalent rights (and dividend equivalent rights as described in such clause if the Director LTIP Award is payable in the form of the Merger Consideration) in respect of each PSXP Common Unit subject to such converted Director LTIP Award. From and after the Effective Time, the former holder of any Partnership LTIP Award (other than the Director LTIP Awards) shall only be entitled to receive Parent RSUs in respect of such Partnership LTIP Awards, which Parent RSUs will include a right to receive payment of any amounts with respect to accrued distribution equivalent right payments as of the Closing in accordance with and subject to the same vesting, forfeiture, payment timing and other provisions as applied under the corresponding Partnership LTIP Award.

As of the Effective Time, unless otherwise determined by the Phillips 66 Board, Phillips 66 shall assume the outstanding unused unit reserve (the “Partnership LTIP Reserve”) under the Partnership Long-Term Incentive Plans for the purpose of making future grants relating to shares of Phillips 66 Common Stock to applicable employees and other service providers of Phillips 66 and its subsidiaries, which Partnership LTIP Reserve shall (i) be adjusted as reasonably determined by the Phillips 66 Board or a committee thereof to give effect to the transactions contemplated by the Merger Agreement, and (ii) be added to the Parent Equity Plans (as defined in the Merger Agreement) in such manner as determined by the Phillips 66 Board or a committee thereof; provided, however, that the number of shares of Phillips 66 Common Stock comprising the Partnership LTIP Reserve, as adjusted pursuant to the Merger Agreement, shall not, when combined with the other shares of Phillips 66 Common Stock issued or to become issued in connection with the Merger or any related transactions, exceed 19.99% of the number of shares of Phillips 66 Common Stock outstanding immediately prior to the Effective Time. The interests in PSXP owned by Phillips 66 and its subsidiaries will remain outstanding as limited partner interests in the surviving entity. The non-economic general partner interest in PSXP held by the General Partner will continue as a non-economic general partner interest in the surviving entity, and the General Partner will continue as the sole general partner of the surviving entity.

Phillips 66 will not issue any fractional shares of Phillips 66 Common Stock in the Merger. Instead of receiving any fractions of a share of Phillips 66 Common Stock, all fractions of shares of Phillips 66 Common Stock to which a PSXP Public Unitholder would otherwise have been entitled will be aggregated, rounded to three decimal places and entitle the holder to receive a cash payment, without interest, rounded to the nearest cent, equal to the product of (i) the aggregated amount of the fractional interest in shares of Phillips 66 Common Stock to which such holder would otherwise be entitled and (ii) an amount equal to the average of the volume weighted average price per share of Phillips 66 Common Stock on the NYSE (as reported by Bloomberg L.P., or, if not reported therein, in another authoritative source mutually selected by Phillips 66 and the General Partner) on each of the ten (10) consecutive trading days ending with the complete trading day immediately prior to the Closing Date.

The Effective Time will occur at such time as Phillips 66 and PSXP cause a certificate of merger to be duly filed with the Secretary of State of the State of Delaware or at such later date or time as may be agreed by Phillips 66 and PSXP in writing and specified in the certificate of merger.

The Closing will take place on the third business day after the satisfaction or waiver of the conditions set forth in the Merger Agreement (other than conditions that by their nature are to be satisfied at the Closing but subject to the satisfaction or waiver of those conditions), or at such other place, date and time as Phillips 66 and PSXP may agree.

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Conditions to Completion of the Merger

The obligations of Phillips 66 and PSXP to effect the Merger are subject to the satisfaction or waiver of the following conditions:

The obligations of Phillips 66, P66 Company, P66 PDI and Merger Sub (each a “P66 Party” and, collectively, the “P66 Parties”) to effect the Merger are subject to the satisfaction or waiver of the following additional conditions:

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The obligation of PSXP to effect the Merger is subject to the satisfaction or waiver of the following additional conditions:

For purposes of the Merger Agreement, the term “material adverse effect” means, when used with respect to a person, any change, condition, circumstance, effect, event, development, state of facts or occurrence that, individually or in the aggregate, has had or would reasonably be expected to have a material adverse effect on the business, operations, assets, condition (financial or otherwise) or results of operations of such person and its subsidiaries, taken as a whole, or prevents or materially impedes, interferes with or hinders a party’s ability to consummate the transactions contemplated by the Merger Agreement, including the Merger and the Phillips 66 Stock Issuance, on or before April 26, 2022; provided, however, that any adverse changes, conditions, circumstances, effects, events, developments, state of facts or occurrences arising out of or resulting from or attributable to any of the following will be disregarded in determining whether a material adverse effect has occurred or would reasonably be expected to occur: (i) changes, conditions, circumstances, effects, events, developments, state of facts or occurrences generally affecting the economy, the financial or capital markets or political, legislative or regulatory conditions or changes in the industries in which such person operates; (ii) the announcement or pendency of the Merger Agreement or the transactions contemplated by the Merger Agreement or, except specifically for purposes of determining whether there is a breach of the representations and warranties made by the applicable parties in the Merger Agreement relating to noncontravention by the parties and the satisfaction of the closing conditions set forth in the Merger Agreement with respect to such representations and warranties, the taking of any action expressly permitted or expressly contemplated by the Merger Agreement; (iii) any change in the market price or trading volume of the limited partner interests, shares of common stock or other equity securities of such person (it being understood and agreed that the foregoing does not preclude any other party to the Merger Agreement from asserting that any facts or occurrences giving rise to or contributing to such change that are not otherwise excluded from the definition of material adverse effect should be deemed to constitute, or be taken into account in determining whether there has been, or would reasonably be expected to

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be, a material adverse effect); (iv) acts of war, terrorism (including domestic terrorism and cyberterrorism) or other hostilities (or the escalation of the foregoing), whether or not pursuant to the declaration of a national emergency or war, pandemics (including the COVID-19 pandemic, any mutation or variation of the virus underlying the COVID-19 pandemic or any health conditions related thereto), epidemics or natural disasters or other force majeure events; (v) changes in any applicable laws or regulations applicable to such person or applicable accounting regulations or principles or the interpretation thereof; (vi) any proceedings commenced by or involving any current or former member, partner or stockholder of such person or any of its subsidiaries arising out of or related to the Merger Agreement or the transactions contemplated by the Merger Agreement; (vii) changes, effects, events or occurrences generally affecting the prices of oil, natural gas or other carbon-based sources of energy or power; (viii) any failure of a person to meet any internal or external projections, budgets, forecasts or estimates of revenues, earnings or other financial or operating metrics for any period (it being understood and agreed that the foregoing does not preclude any other party to the Merger Agreement from asserting that any facts or occurrences giving rise to or contributing to such failure that are not otherwise excluded from the definition of material adverse effect should be deemed to constitute, or be taken into account in determining whether there has been, or would reasonably be expected to be, a material adverse effect); (ix) any (A) action or determination by any governmental authority or (B) any proceeding, in each of clause (A) or (B), only to the extent such matters arise out of, or relate to, facts or circumstances in respect of the DAPL Assets existing as of the date of the Merger Agreement; and (x) with respect to Phillips 66 only, any effect to the extent resulting from a change, condition, circumstance, effect, event, development, state of facts or occurrence that has a material adverse effect on PSXP and its subsidiaries; provided, however, that changes, conditions, circumstances, effects, events, developments, state of facts or occurrences referred to in clauses (i), (iv), (v) and (vii) above will be considered for purposes of determining whether there has been or would reasonably be expected to be a material adverse effect if and to the extent such changes, conditions, circumstances, effects, events, developments, states of facts or occurrences have had or would reasonably be expected to have a disproportionate adverse effect on such person and its subsidiaries, taken as a whole, as compared to other companies of similar size operating in the industries in which such person and its subsidiaries operate.

For purposes of the Merger Agreement, except where expressly provided otherwise, PSXP and its subsidiaries are not considered subsidiaries of Phillips 66, P66 Company, P66 PDI or affiliates of Phillips 66, P66 Company, P66 PDI or any of their subsidiaries (including the General Partner and Merger Sub).

Representations and Warranties

The Merger Agreement contains representations and warranties by the P66 Parties, on the one hand, and PSXP and the General Partner, on the other hand.

These representations and warranties have been made solely for the benefit of the parties to the Merger Agreement and:

Accordingly, these representations and warranties should not be read alone, but instead should be read only in conjunction with the information provided elsewhere in this information statement/prospectus and in the documents incorporated by reference into this information statement/prospectus, which may include information that updates, modifies or qualifies the information set forth in the representations and warranties.

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The representations and warranties made by the P66 Parties relate to, among other things:

Additionally, the P66 Parties made representations and warranties to PSXP and the General Partner related to their ownership of PSXP Common Units.

The representations and warranties made by PSXP and the General Partner relate to, among other things:

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Conduct of Business Prior to Closing

Under the Merger Agreement, Phillips 66, on the one hand, and each of PSXP and the General Partner, on the other hand, has undertaken certain covenants that place restrictions on it and its respective subsidiaries from the date of the Merger Agreement until the earlier of the termination of the Merger Agreement in accordance with its terms and the Effective Time, unless the other party gives its prior written consent (which consent cannot be unreasonably withheld, conditioned or delayed).

Subject to certain exceptions, unless Phillips 66 consents in writing (which consent cannot be unreasonably withheld, conditioned or delayed), each of PSXP and the General Partner have agreed, and will cause each of their respective subsidiaries, to (i) conduct its business in the ordinary course of business consistent with past practice; provided, that it will not prohibit PSXP and its subsidiaries from taking commercially reasonable actions outside of the ordinary course of business or not consistent with past practice in response to (x) changes or developments resulting or arising from the COVID-19 pandemic or (y) other changes or developments that would reasonably be expected to cause a reasonably prudent company similar to PSXP to take commercially reasonable actions outside of the ordinary course of business consistent with past practice, (ii) use commercially reasonable efforts to maintain and preserve intact its business organization and the goodwill of those having business relationships with it and retain the services of its present officers and key employees, if any, (iii) use commercially reasonable efforts to keep in full force and effect all material permits and all material insurance policies maintained by PSXP and its subsidiaries, other than changes to such policies made in the ordinary course of business, and (iv) use commercially reasonable efforts to comply in all material respects with all applicable laws and the requirements of PSXP material contracts.

Subject to certain exceptions, unless Phillips 66 consents in writing (which consent cannot be unreasonably withheld, conditioned or delayed), PSXP and the General Partner, will not, and will not permit their respective subsidiaries to:

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Subject to certain exceptions, unless PSXP consents in writing (which consent cannot be unreasonably withheld, conditioned or delayed), Phillips 66 has agreed, and will cause each other P66 Party, to (i) conduct its business in the ordinary course of business consistent with past practice; provided, that it will not prohibit Phillips 66 and its subsidiaries from taking commercially reasonable actions outside of the ordinary course of business or not consistent with past practice in response to (x) changes or developments resulting or arising from the COVID-19 pandemic or (y) other changes or developments that would reasonably be expected to cause a reasonably prudent company similar to the Phillips 66 to take commercially reasonable actions outside of the ordinary course of business consistent with past practice, (ii) use commercially reasonable efforts to maintain and preserve intact its business organization and the goodwill of those having business relationships with it and retain the services of its present officers and key employees, (iii) use commercially reasonable efforts to keep in full force and effect all material permits and all material insurance policies maintained by such P66 Party, other than changes to such policies made in the ordinary course of business, and (iv) use commercially reasonable efforts to comply in all material respects with all applicable laws and the requirements of all Phillips 66 material contracts.

Subject to certain exceptions, unless PSXP consents in writing (which consent cannot be unreasonably withheld, conditioned or delayed), Phillips 66 will not, and will not permit any of the other P66 Parties to:

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Agreement to Take Further Action and to Use Reasonable Best Efforts

Each of the P66 Parties, on the one hand, and PSXP and the General Partner, on the other hand, will cooperate with the other and use and cause their respective subsidiaries to use their reasonable best efforts to (i) take, or cause to be taken, all appropriate actions, and do, or cause to be done, all things, necessary, proper or advisable to cause the conditions to the Closing to be satisfied as promptly as practicable (and in any event no later than April 26, 2022), including, for the avoidance of doubt, in the case of Phillips 66 and the General Partner, until the Effective Time or the termination of the Merger Agreement, retaining ownership and voting control, directly or indirectly, over all PSXP Common Units and the general partner interest in PSXP beneficially owned by Phillips 66, any of its subsidiaries or the General Partner, as applicable, as of the date of the Merger Agreement or acquired thereafter, and to complete and make effective, in the most expeditious manner practicable, the transactions contemplated by the Merger Agreement, including preparing and filing as promptly as practicable all documentation to effect all necessary filings, notifications, notices, petitions, statements, registrations, submissions of information, applications and other documents; (ii) obtain promptly (and in any event no later than April 26, 2022) all approvals, consents, waivers, clearances, expirations or terminations of waiting periods, registrations, permits, authorizations and other confirmations from any governmental authority or third party necessary, proper or advisable to complete the transactions contemplated by the Merger Agreement; and (iii) defend any proceedings challenging the Merger Agreement or the completion of the transactions contemplated by the Merger Agreement or seek to have lifted or rescinded any injunction or restraining order or other order adversely affecting the ability of the parties to complete the transactions contemplated by the Merger Agreement.

Dividends and Distributions

After the date of the Merger Agreement and prior to the Effective Time, each of Phillips 66 and PSXP will coordinate with the other regarding the timing of any declaration of any dividends or distributions in respect of Phillips 66 Common Stock and PSXP Common Units and the record dates and payment dates relating thereto. It is the intention of Phillips 66 and PSXP that PSXP Public Unitholders not receive, for any quarter, distributions both in respect of PSXP Common Units and also dividends in respect of Phillips 66 Common Stock they receive in exchange for such PSXP Common Units in the Merger. Without limiting the foregoing, the General Partner shall cause PSXP to declare, authorize and pay regular quarterly cash distributions on the PSXP Common Units in accordance with past practice and in an amount not less than $0.875 per PSXP Common Unit for the quarterly period ending December 31, 2021 and for each full quarterly period thereafter during the term of the Merger Agreement to the extent the Closing does not occur prior to the applicable record date established by the GP Board with respect to each such quarterly distribution; provided, however, that neither the General Partner nor PSXP shall be required to take any action that would violate applicable law, the organizational documents of PSXP or any contract to which PSXP or the General Partner is a party as of the date of the Merger Agreement.

Conflicts Committee

Prior to the earlier of the Effective Time and the termination of the Merger Agreement, Phillips 66 shall not, and it shall not permit any of its subsidiaries to, take any action intended to cause the General Partner (or the sole member of the General Partner) to, without the consent of a majority of the then existing members of the

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Conflicts Committee, eliminate the Conflicts Committee, revoke or diminish the authority of the Conflicts Committee or remove or cause the removal of any director of the General Partner who is a member of the Conflicts Committee either as a director or as a member of the Conflicts Committee. This covenant does not apply to the removal of any director for Cause (as defined in the Merger Agreement) or the filling of any vacancies in the Conflicts Committee pursuant to the terms of the General Partner Company Agreement (as defined in the Merger Agreement).

Access to Information

Until completion of the Merger, each of the P66 Parties, PSXP and the General Partner has agreed to, and to cause each of its subsidiaries to, afford the other parties and their respective representatives, reasonable access during normal business hours and on certain conditions, to all of its and its subsidiaries’ respective properties, commitments, books, contracts, records and correspondence (in each case, whether in physical or electronic form), officers, employees, accountants, counsel, financial advisors and other representatives, in each case for integration and operational planning related to the transactions contemplated by the Merger Agreement.

Indemnification and Insurance

The Merger Agreement provides that from and after the Effective Time, to the fullest extent permitted under applicable laws, Phillips 66 will, and will cause PSXP (as the surviving entity of the Merger) to, (i) indemnify and hold harmless against any reasonable cost or expenses (including reasonable attorneys’ fees and all other reasonable costs, expenses and obligations), judgments, fines, losses, claims, damages or liabilities, penalties and amounts paid in settlement in connection with any actual or threatened legal proceeding, and provide advancement of expenses with respect to each of the foregoing to any person who is now, or has been or becomes at any time prior to the Effective Time, an officer, director or employee of Phillips 66, PSXP, the General Partner, P66 PDI or any of their respective subsidiaries; and (ii) honor the provisions regarding elimination of liability of officers and directors, indemnification of officers, directors and employees and advancement of expenses contained in the organizational documents of PSXP and the General Partner immediately prior to the Effective Time and ensure that the organizational documents of PSXP and the General Partner or any of their respective successors or assigns, if applicable, will for a period of six years following the Effective Time, contain provisions no less favorable with respect to indemnification, advancement of expenses and exculpation of present and former directors, officers and employees of PSXP and the General Partner than are presently set forth in such organizational documents. In addition, PSXP (as the surviving entity of the Merger), or Phillips 66, on behalf of PSXP, will maintain in effect for six years following the Effective Time PSXP’s current directors’ and officers’ liability insurance policies covering acts or omissions occurring at or prior to the Effective Time with respect to any person who is now, or has been or becomes at any time prior to the Effective Time, an officer, director or employee of Phillips 66, PSXP, the General Partner, P66 PDI or any of their respective subsidiaries, provided that in no event will PSXP or Phillips 66, as applicable, be required to expend more than an amount per year equal to 300% of current annual premiums paid by PSXP for such insurance.

Certain Tax Matters

For U.S. federal income tax purposes (and for purposes of any applicable state, local or foreign tax that follows the U.S. federal income tax treatment), the parties have agreed to treat the Merger as a taxable sale of 99% of the PSXP Public Common Units to P66 PDI and 1% of the PSXP Public Common Units to P66 Company in exchange for the Merger Consideration. The parties will prepare and file all tax returns consistent with the foregoing and will not take any inconsistent position on any tax return, or during the course of any proceeding with respect to taxes, except as otherwise required by applicable law following a final determination by a court of competent jurisdiction or other administrative settlement with or final administrative decision by the relevant governmental authority.

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Withholding Taxes

Each of the P66 Parties, PSXP (as the surviving entity of the Merger) and the exchange agent, as applicable, are entitled to deduct and withhold from any amounts, including the Merger Consideration, payable pursuant to the Merger Agreement to any person such amounts as the P66 Parties, PSXP (as the surviving entity of the Merger) or the exchange agent, as applicable, reasonably deems it is required to deduct and withhold under the Code or any provision of state, local or foreign tax law with respect to the making of such payment. Such deduction and withholding may be taken in securities, in which case the P66 Parties, PSXP (as the surviving entity of the Merger) or the exchange agent, as applicable, will be treated as having sold such securities for an amount of cash equal to the fair market value of such securities at the time of such deemed sale. To the extent that deducted and withheld amounts (including deemed proceeds from the deemed sale of securities) are paid over to the appropriate governmental authority, such amounts (including securities) will be treated for all purposes of the Merger Agreement as having been paid or issued to the person in respect of whom such deduction and withholding was made.

Adjustments to Prevent Dilution

The Merger Consideration, the Exchange Ratio and any other similar dependent item, as applicable, will be adjusted to reflect fully the effect of any subdivisions, reclassifications, splits, share distributions, combinations or exchanges of PSXP Common Units or shares of Phillips 66 Common Stock (excluding, for the avoidance of doubt, any issuance of PSXP Common Units upon conversion of Series A Preferred Units into PSXP Common Units), as applicable, that change the number of outstanding PSXP Common Units or shares of Phillips 66 Common Stock between the date of the Merger Agreement and the Effective Time to provide the PSXP Public Unitholders the same economic effect as contemplated by the Merger Agreement prior to such event.

NYSE Listing, Delisting and Deregistration

Phillips 66 has agreed to use its reasonable best efforts to cause the shares of Phillips 66 Common Stock to be issued in connection with the Merger to be listed on the NYSE, subject to official notice of issuance, prior to the Effective Time.

PSXP has agreed to cooperate and use its reasonable best efforts to cause the delisting of the PSXP Common Units from the NYSE and the deregistration of such securities under the Exchange Act as promptly as practicable following the Closing in compliance with applicable law.

Section 16 Matters

Prior to the completion of the Merger, PSXP has agreed to take all steps as may be required (to the extent permitted under applicable law) to cause any dispositions of PSXP Common Units or acquisitions of Phillips 66 Common Stock (including derivative securities with respect to Phillips 66 Common Stock) resulting from the Merger by each individual who is subject to the reporting requirements of Section 16(a) of the Exchange Act with respect to PSXP, or will become subject to such reporting requirements with respect to Phillips 66, to be exempt under Rule 16b-3 promulgated under the Exchange Act.

Other Covenants and Agreements

The Merger Agreement also contains covenants relating to cooperation in the preparation of this information statement/prospectus and additional agreements relating to, among other things applicability of takeover statutes, fees and expenses, securityholder litigation and public announcements.

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Termination of the Merger Agreement

The Merger Agreement may be terminated prior to the Closing:

Effect of Termination; Termination Expenses

If the Merger Agreement is validly terminated, then, except as described below, each of the parties will be relieved of its duties and obligations and such termination will be without liability to any party. However, termination will not relieve any party of any liability for failure to consummate the Merger and other transactions contemplated by the Merger Agreement when required under the agreement or for intentional fraud or any “willful breach” (as defined in the Merger Agreement).

The Merger Agreement contains various amounts payable under the circumstances described below.

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Amendment or Supplement

At any time prior to the Effective Time, the Merger Agreement may be amended or supplemented in any and all respects by written agreement of the parties, by action taken or authorized by the Phillips 66 Board and the GP Board; provided, however, that the GP Board may not take or authorize any such action unless it has been approved by the Conflicts Committee; provided, further, that there will be no amendment or change to the provisions of the Merger Agreement that by applicable laws, the Third A&R Partnership Agreement or stock exchange rule would require further approval by the PSXP Limited Partners.

GP Board Consent

Unless otherwise expressly set forth in the Merger Agreement, whenever a determination, decision, approval, consent, waiver or agreement of PSXP or the General Partner is required pursuant to the Merger Agreement (including any determination to exercise or refrain from exercising any termination rights or to enforce the terms of the Merger Agreement (including specific performance)), such approval, consent, waiver, decision or determination must be authorized by the GP Board; provided, however, that the GP Board may not take or authorize any such action unless it has been approved in writing by the Conflicts Committee.

Assignment

The Merger Agreement and any interests, rights or obligations under the Merger Agreement are not assignable, in whole or in part, by operation of law or otherwise, by any of the parties without the prior written consent of the other parties, but no such assignment shall relieve Merger Sub of any of its obligations thereunder.

Specific Performance

The parties to the Merger Agreement have agreed that each party will be entitled to an injunction or injunctions to prevent breaches of the Merger Agreement and to enforce specifically the terms and provisions of the Merger Agreement. Each of the parties has agreed that it will not oppose the granting of an injunction, specific performance and other equitable relief on the basis that (i) either party has an adequate remedy at law, or (ii) an award of specific performance is not an appropriate remedy for any reason at law or equity. Each party has further agreed that no party is required to obtain, furnish or post any bond or similar instrument in connection with or as a condition to obtaining any remedy, and each party has irrevocably waived any right it may have to require the obtaining, furnishing or posting of any such bond or similar instrument.

Governing Law

The Merger Agreement is governed by, and construed in accordance with, the laws of the State of Delaware.

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Related Agreements

LPA Amendment

On October 26, 2021, in connection with the entry into the Merger Agreement, the General Partner executed and delivered Amendment No. 1 to the Third A&R Partnership Agreement and the amendment related thereto, the “LPA Amendment,” which was adopted and became effective on such date.

The LPA Amendment provides amendments to the treatment of the Series A Preferred Units in the event of a Series A Change of Control (as defined in the Third A&R Partnership Agreement). Specifically, the LPA Amendment carves out Partnership Rollup Events (as defined in the Third A&R Partnership Agreement) from the provision allowing holders of Series A Preferred Units to make elections regarding the treatment of their Series A Preferred Units in the event of a Series A Change of Control. Prior to the LPA Amendment taking effect, upon the occurrence of a Partnership Rollup Event holders of Series A Preferred Units were entitled to elect from the following:

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Pursuant to the LPA Amendment, in the event of a Partnership Rollup Event, the Series A Preferred Units will be automatically converted, without any action of the holders thereof, the General Partner or any other party, into PSXP Common Units at the Partnership Rollup Series A Conversion Rate, which the LPA Amendment defines as: the number of PSXP Common Units issuable to a holder of Series A Preferred Units upon the conversion of the Series A Preferred Units held by such holder immediately prior to the Partnership Rollup Event, at a conversion ratio equal to the quotient of (I) (a) the product of (i) 147.5% multiplied by (ii) the Series A Issue Price less (b) such holders pro rata portion of the aggregate cash distributions paid on all Series A Preferred Units on or prior to the date of such Partnership Rollup Event with respect to any Quarter following the Quarter ending June 30, 2021, divided by (II) the closing price of the PSXP Common Units on the last trading day immediately preceding the closing of such Partnership Rollup Event.

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COMPARISON OF RIGHTS OF PHILLIPS 66 STOCKHOLDERS AND PSXP UNITHOLDERS

Phillips 66 is a Delaware corporation, and PSXP is a Delaware limited partnership. Ownership interests in a limited partnership are fundamentally different from ownership interests in a corporation. The rights of Phillips 66 Stockholders are governed by Phillips 66’s Amended and Restated Certificate of Incorporation, effective as of April 30, 2012 (the “Phillips 66 Charter”), the Amended and Restated By-Laws of Phillips 66, effective as of February 8, 2017 (as amended, the “Phillips 66 Bylaws” and, together with the Phillips 66 Charter, the “Phillips 66 Organizational Documents”), and the Delaware General Corporation Law (“DGCL”). The rights of PSXP Unitholders and PSXP Preferred Unitholders are governed by the Third A&R Partnership Agreement and the Delaware Revised Uniform Limited Partnership Act (the “DRULPA”). If the Merger is completed, the rights of PSXP Unitholders as Phillips 66 Stockholders following the conversion of the PSXP Public Common Units to Phillips 66 Common Stock will be governed by the Phillips 66 Organizational Documents and the DGCL. There are many differences between the rights of PSXP Unitholders and Phillips 66 Stockholders. Some of these, such as distribution/dividend rights and voting rights, are significant. The following description summarizes the material differences between the rights of Phillips 66 Stockholders and PSXP Unitholders but does not purport to be a complete statement of all those differences or a complete description of the specific provisions referred to in this summary. The identification of specific differences is not intended to indicate that other equally significant or more significant differences do not exist. PSXP Unitholders should carefully read the relevant provisions of the Phillips 66 Organizational Documents, and the Third A&R Partnership Agreement. Copies of the documents referred to in this summary may be obtained as described under “Where You Can Find More Information.” This summary is qualified in its entirety by reference to the DGCL, the DRULPA, the Phillips 66 Organizational Documents and the Third A&R Partnership Agreement. Capitalized terms used herein and not otherwise defined herein are used as defined in the Phillips 66 Organizational Documents and the Third A&R Partnership Agreement, as applicable.

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DESCRIPTION OF PHILLIPS 66 CAPITAL STOCK

The following summary describes the common stock, $0.01 par value, of Phillips 66, which are the only securities of Phillips 66 registered pursuant to Section 12 of the Securities Exchange Act of 1934, as amended.

The following summary does not purport to be complete and is subject to, and is qualified in its entirety by reference to, the applicable provisions of Delaware law and the Phillips 66 Charter and the Phillips 66 Bylaws, copies of which are incorporated by reference as an exhibit to Phillips 66’s Annual Report on Form 10-K. The terms of these securities also may be affected by the DGCL.

Authorized Capital Stock

Phillips 66 is authorized to issue 2.5 billion shares of common stock, par value $0.01 per share, and 500 million shares of preferred stock, par value $0.01 per share.

Voting Rights

Each share of Phillips 66 Common Stock is entitled to one vote on all matters submitted to a vote of stockholders. Members of the Phillips 66 Board are elected by a majority of the votes cast in person or by proxy and entitled to vote, including votes to withhold authority and excluding abstentions. Holders of shares of Phillips 66 Common Stock do not have cumulative voting rights. In other words, a holder of a single share of Phillips 66 Common Stock cannot cast more than one vote for each position to be filled on the Phillips 66 Board. A consequence of not having cumulative voting rights is that the holders of a majority of the shares of Phillips 66 Common Stock entitled to vote in the election of directors can elect all directors standing for election, which means that the holders of the remaining shares will not be able to elect any directors.

Other Rights

In the event of any liquidation, dissolution or winding up of Phillips 66, after the satisfaction in full of the liquidation preferences of holders of any preferred shares, holders of shares of Phillips 66 Common Stock are entitled to ratable distribution of the remaining assets available for distribution to stockholders. The shares of Phillips 66 Common Stock are not subject to redemption by operation of a sinking fund or otherwise. Holders of shares of Phillips 66 Common Stock are not entitled to preemptive rights.

Fully Paid

The issued and outstanding shares of Phillips 66 Common Stock are fully paid and non-assessable. This means the full purchase price for the outstanding shares of Phillips 66 Common Stock has been paid and the holders of such shares will not be assessed any additional amounts for such shares. Any additional shares of Phillips 66 Common Stock that Phillips 66 may issue in the future will also be fully paid and non-assessable.

Listing

Phillips 66 Common Stock is traded on the New York Stock Exchange under the trading symbol “PSX.”

Transfer Agent and Registrar

The transfer agent and registrar for the Phillips 66 Common Stock is Computershare Shareowner Services LLC.

Preferred Stock

The Phillips 66 Board, without further action by the holders of Phillips 66 Common Stock, may issue shares of preferred stock. The Phillips 66 Board is vested with the authority to fix by resolution the designations,

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preferences and relative, participating, optional or other special rights, and such qualifications, limitations or restrictions thereof, including, without limitation, redemption rights, dividend rights, liquidation preferences and conversion or exchange rights of any class or series of preferred stock, and to fix the number of classes or series of preferred stock, the number of shares constituting any such class or series and the voting powers for each class or series.

The authority of the Phillips 66 Board to issue preferred stock could potentially be used to discourage attempts by third parties to obtain control of Phillips 66 through a merger, tender offer, proxy contest or otherwise by making such attempts more difficult or more costly. The Phillips 66 Board may issue preferred stock with voting rights or conversion rights that, if exercised, could adversely affect the voting power of the holders of Phillips 66 Common Stock. No current agreements or understandings exist with respect to the issuance of preferred stock, and the Phillips 66 Board has no present intention to issue any shares of preferred stock.

Authorized but Unissued Stock

Phillips 66 has 2.5 billion authorized shares of common stock and 500 million authorized shares of preferred stock. One of the consequences of Phillips 66’s authorized but unissued common stock and undesignated preferred stock may be to enable the Phillips 66 Board to make more difficult or to discourage an attempt to obtain control of Phillips 66. If, in the exercise of its fiduciary obligations, the Phillips 66 Board determined that a takeover proposal was not in Phillips 66’s best interest, the Phillips 66 Board could authorize the issuance of those shares without stockholder approval, subject to limits imposed by the NYSE. The shares could be issued in one or more transactions that might prevent or make the completion of a proposed change of control transaction more difficult or costly by:

Anti-Takeover Provisions of the Phillips 66 Charter and Phillips 66 Bylaws

The Phillips 66 Charter and Phillips 66 Bylaws contain provisions that could delay or make more difficult the acquisition of control of Phillips 66 through a hostile tender offer, open market purchases, proxy contest, merger or other takeover attempt that a stockholder might consider in his or her best interest, including those attempts that might result in a premium over the market price of Phillips 66 Common Stock.

Size of Board and Vacancies; Removal

The Phillips 66 Charter provides for a classified board of directors. Class I directors have a current term expiring in 2022, Class II directors have a current term expiring in 2023 and Class III directors have a current term expiring in 2021. At each annual meeting of stockholders, directors will be elected to succeed the class of directors whose terms have expired. This classification of the Phillips 66 Board could have the effect of increasing the length of time necessary to change the composition of a majority of the Phillips 66 Board; in general, at least two annual meetings of stockholders will be necessary for stockholders to effect a change in a majority of the members of the Phillips 66 Board.

The Phillips 66 Organizational Documents provide, subject to the rights of holders of a series of shares of preferred stock to elect one or more directors pursuant to any provisions of any certificate of designation relating to any such series, that the number of directors will be fixed exclusively by a majority of the entire Phillips 66 Board from time to time. The Phillips 66 Bylaws provide that directors may be removed, only for cause, by the affirmative vote of the holders of at least a majority of the voting power of Phillips 66 entitled to vote generally

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for the election of directors, voting together as a single class. The Phillips 66 Bylaws also provide that, unless the Phillips 66 Board determines otherwise, vacancies, however created, may be filled only by a majority of the remaining directors, even if less than a quorum.

Stockholder Action by Written Consent

The Phillips 66 Organizational Documents provide that Phillips 66 Stockholders may act only at an annual or special meeting of stockholders and may not act by written consent.

Stockholder Meetings

The Phillips 66 Organizational Documents provide that only a majority of the entire Phillips 66 Board or the chairman of the Phillips 66 Board may call a special meeting of Phillips 66 Stockholders.

Requirements of Advance Notice for Stockholder Nominations and Proposals

The Phillips 66 Bylaws contain advance-notice and other procedural requirements that apply to stockholder nominations of persons for election to the Phillips 66 Board at any annual meeting of stockholders and to stockholder proposals that stockholders take any other action at any annual meeting. In the case of any annual meeting, a stockholder proposing to nominate a person for election to the Phillips 66 Board or proposing that any other action be taken must give Phillips 66’s corporate secretary written notice of the proposal not less than 90 days and not more than 120 days before the first anniversary of the date of the immediately preceding year’s annual meeting of stockholders. These stockholder proposal deadlines are subject to exceptions if the annual meeting date is more than 30 days before or after such anniversary date, in which case notice by such stockholder, to be timely, must be so delivered not earlier than the close of business on the 120th day prior to the date of such annual meeting and not later than the close of business on the later of the 90th day prior to the date of such annual meeting or, if the first public announcement of the date of such annual meeting is less than 100 days prior to the date of such meeting, the tenth day following the day on which Phillips 66 first makes a public announcement of the date of the annual meeting. If the chairman of the Phillips 66 Board or a majority of the Phillips 66 Board calls a special meeting of stockholders for the election of directors, a stockholder proposing to nominate a person for that election must give Phillips 66’s corporate secretary written notice of the proposal not earlier than the close of business on the 120th day prior to the date of such special meeting and not later than close of business on the later of the 90th day prior to the date of such special meeting or, if the first public announcement of the date of the special meeting is less than 100 days prior to the date of such meeting, the tenth day following the day on which public announcement is first made of the date of the special meeting and of the nominees proposed by the Phillips 66 Board. The Phillips 66 Bylaws prescribe specific information that any such stockholder notice must contain.

These advance-notice provisions may have the effect of precluding a contest for the election of the Phillips 66 directors or the consideration of stockholder proposals if the proper procedures are not followed, and of discouraging or deterring a third party from conducting a solicitation of proxies to elect its own slate of directors or to approve its own proposal, without regard to whether consideration of those nominees or proposals might be harmful or beneficial to Phillips 66 and Phillips 66 Stockholders.

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Delaware Statutory Business Combination Provision

As a Delaware corporation, Phillips 66 is subject to Section 203 of the DGCL. In general, Section 203 prevents an “interested stockholder,” which is defined generally as a person owning 15 percent or more of a Delaware corporation’s outstanding voting stock or any affiliate or associate of that person, from engaging in a broad range of “business combinations” with the corporation for three years following the date on which that person became an interested stockholder unless:

Under Section 203, the restrictions described above also do not apply to specific business combinations proposed by an interested stockholder following the announcement or notification of designated extraordinary transactions involving the corporation and a person who had not been an interested stockholder during the previous three years or who became an interested stockholder with the approval of a majority of the corporation’s directors, if a majority of the directors who were directors prior to any person’s becoming an interested stockholder during the previous three years, or were recommended for election or elected to succeed those directors by a majority of those directors, approve or do not oppose that extraordinary transaction.

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MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCES

The following is a discussion of U.S. federal income tax consequences to U.S. Holders (as defined below) of the Merger and of owning and disposing of shares of Phillips 66 Common Stock received in the Merger. This discussion is limited to U.S. Holders of PSXP Public Common Units that hold their PSXP Public Common Units, and will hold their shares of Phillips 66 Common Stock received in the Merger, as capital assets for U.S. federal income tax purposes (generally, property held for investment). This discussion does not address tax consequences that may be relevant to particular holders in light of their individual circumstances, including, without limitation:

If a partnership, or any entity or arrangement treated as a partnership for U.S. federal income tax purposes, holds PSXP Common Units, the tax treatment of a partner in such entity or arrangement will generally depend on the status of the partner and the activities of the entity or arrangement. A partner in such an entity or arrangement holding PSXP Common Units should consult its own tax advisor regarding the tax consequences of the Merger and of owning and disposing of any shares of Phillips 66 Common Stock received in the Merger.

Moreover, this discussion does not address any tax consequences arising under the net investment income tax or the alternative minimum tax, nor does it address any tax consequences arising under the laws of any state, local or foreign jurisdiction, or under any U.S. federal laws other than those pertaining to income taxes.

This discussion is based on provisions of the Code, administrative pronouncements, judicial decisions and final, temporary and proposed Treasury regulations, all as of the date hereof, and any of which are subject to change, possibly with a retroactive effect so as to result in U.S. federal income tax consequences different from

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those discussed below. No ruling has been or is expected to be sought from the IRS with respect to any of the tax consequences discussed below. As a result there can be no assurances that the IRS will not assert, or that a court would not sustain, a position contrary to any of the conclusions set forth below.

For purposes of this discussion, a “U.S. Holder” is a beneficial owner of PSXP Public Common Units or shares of Phillips 66 Common Stock received in the Merger that is for U.S. federal income tax purposes:

THIS DISCUSSION IS PROVIDED FOR GENERAL INFORMATION ONLY AND IS NOT A COMPLETE ANALYSIS OR DESCRIPTION OF ALL POTENTIAL U.S. FEDERAL INCOME TAX CONSEQUENCES OF THE MERGER OR THE RECEIPT, OWNERSHIP AND DISPOSITION OF SHARES OF PHILLIPS 66 COMMON STOCK RECEIVED IN THE MERGER. EACH HOLDER OF PSXP COMMON UNITS IS STRONGLY URGED TO CONSULT WITH AND RELY UPON ITS OWN TAX ADVISOR AS TO THE SPECIFIC FEDERAL, STATE, LOCAL AND NON-U.S. TAX CONSEQUENCES TO SUCH HOLDER OF THE MERGER AND THE RECEIPT, OWNERSHIP AND DISPOSITION OF SHARES OF PHILLIPS 66 COMMON STOCK RECEIVED IN THE MERGER, TAKING INTO ACCOUNT ITS OWN PARTICULAR CIRCUMSTANCES.

Tax Consequences of the Merger to U.S. Holders of PSXP Common Units

Tax Characterization of the Merger

The receipt of shares of Phillips 66 Common Stock in exchange for PSXP Common Units pursuant to the Merger will be a taxable transaction to U.S. Holders for U.S. federal income tax purposes. In general, the Merger will be treated as a taxable sale of a U.S. Holder’s PSXP Common Units in exchange for shares of Phillips 66 Common Stock received in the Merger. The remainder of this discussion assumes that the Merger will be treated as a taxable transaction.

Amount and Character of Gain or Loss Recognized

A U.S. Holder who receives shares of Phillips 66 Common Stock in exchange for PSXP Common Units pursuant to the Merger will recognize gain or loss in an amount equal to the difference between (i) the sum of (A) the fair market value of the shares of Phillips 66 Common Stock received (plus any cash received in lieu of a fractional share of Phillips 66 Common Stock) and (B) such U.S. Holder’s share of PSXP’s nonrecourse liabilities immediately prior to the Merger and (ii) such U.S. Holder’s adjusted tax basis in the PSXP Common Units exchanged therefor (which includes such U.S. Holder’s share of PSXP’s nonrecourse liabilities immediately prior to the Merger).

A U.S. Holder’s initial tax basis in PSXP Common Units purchased with cash equaled, at the time of such purchase, the amount such holder paid for the PSXP Common Units plus the U.S. Holder’s share of PSXP’s nonrecourse liabilities. Over time that basis has (i) increased by the U.S. Holder’s share of PSXP’s income and by any increases in the U.S. Holder’s share of PSXP’s nonrecourse liabilities, and (ii) decreased, but not below

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zero, by distributions from PSXP, by the U.S. Holder’s share of PSXP’s losses, by any decreases in the U.S. Holder’s share of PSXP’s nonrecourse liabilities and by the U.S. Holder’s share of PSXP’s expenditures that are not deductible in computing taxable income and are not required to be capitalized. Upon the disposition of a PSXP Common Unit, including in connection with the Merger, a U.S. Holder’s basis in its PSXP Common Unit will be increased by the U.S. Holder’s share of certain items related to business interest not yet deductible by such U.S. Holder due to applicable limitations on the deductibility of such business interest.

Except as noted below, gain or loss recognized by a U.S. Holder on the exchange of PSXP Common Units in the Merger will generally be taxable as capital gain or loss. However, a portion of this gain or loss, which could be substantial, will be separately computed and taxed as ordinary income or loss under Section 751 of the Code to the extent attributable to “unrealized receivables,” including depreciation recapture, or to “inventory items” owned by PSXP and its subsidiaries. Ordinary income attributable to unrealized receivables and inventory items may exceed net taxable gain realized upon the exchange of a PSXP Common Unit pursuant to the Merger Agreement and may be recognized even if there is a net taxable loss realized on the exchange of such U.S. Holder’s PSXP Common Units pursuant to the Merger. Consequently, a U.S. Holder may recognize both ordinary income and capital loss upon the exchange of PSXP Common Units in the Merger.

Capital gain or loss recognized by a U.S. Holder will generally be long-term capital gain or loss if the U.S. Holder has held its PSXP Common Units for more than twelve months as of the Effective Time. If the U.S. Holder is an individual, such long-term capital gain will generally be eligible for reduced rates of taxation. Capital losses recognized by a U.S. Holder may offset capital gains and, in the case of individuals, no more than $3,000 of ordinary income. Capital losses recognized by U.S. Holders that are corporations may only be used to offset capital gains.

The amount of gain or loss recognized by each U.S. Holder in the Merger will vary depending on each U.S. Holder’s particular situation, including the value of the shares of Phillips 66 Common Stock received by each U.S. Holder in the Merger, the adjusted tax basis of the PSXP Common Units exchanged by each U.S. Holder in the Merger, and the amount of any suspended passive losses that may be available to a particular unitholder to offset all or a portion of the gain recognized by each U.S. Holder. Passive losses that were not deductible by a U.S. Holder in prior taxable periods because they exceeded a U.S. Holder’s share of PSXP’s income may be deducted in full upon the U.S. Holder’s taxable disposition of its entire investment in PSXP pursuant to the Merger. Each U.S. Holder is strongly urged to consult its own tax advisor with respect to the unitholder’s specific tax consequences of the Merger, taking into account its own particular circumstances.

PSXP Items of Income, Gain, Loss, and Deduction for the Taxable Period of PSXP that Includes the Date of the Merger

A U.S. Holder of PSXP Common Units will be allocated its share of PSXP’s items of income, gain, loss, and deduction for the taxable period of PSXP that includes the date of the Merger in accordance with the terms of the Third A&R Partnership Agreement. A U.S. Holder will be subject to U.S. federal income tax on any such allocated income and gain even if such U.S. Holder does not receive a cash distribution from PSXP. Any such income and gain allocated to a U.S. Holder will increase the U.S. Holder’s tax basis in the PSXP Common Units held and, therefore, will reduce the gain, or increase the loss, recognized by such U.S. Holder resulting from the Merger. Any losses or deductions allocated to a U.S. Holder will decrease the U.S. Holder’s tax basis in the PSXP Common Units held and, therefore, will increase the gain, or reduce the loss, recognized by such U.S. Holder resulting from the Merger.

Tax Basis and Holding Period in Shares of Phillips 66 Common Stock Received in the Merger

A U.S. Holder’s tax basis in the shares of Phillips 66 Common Stock received in the Merger will equal the fair market value of such shares. A U.S. Holder’s holding period in the shares of Phillips 66 Common Stock received in the Merger will begin on the day after the date of the Merger.

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Tax Consequences to U.S. Holders of Owning and Disposing of Shares of Phillips 66 Common Stock Received in the Merger

Distributions on Shares of Phillips 66 Common Stock

For U.S. federal income tax purposes, distributions of cash by Phillips 66 to a U.S. Holder with respect to shares of Phillips 66 Common Stock received in the Merger will generally be included in a U.S. Holder’s income as ordinary dividend income to the extent of Phillips 66’s current or accumulated “earnings and profits” as determined under U.S. federal income tax principles. A portion of the cash distributed to Phillips 66 Stockholders by Phillips 66 after the Merger may exceed Phillips 66’s current and accumulated earnings and profits. Distributions of cash in excess of Phillips 66’s current and accumulated earnings and profits will be treated as a non-taxable return of capital reducing a U.S. Holder’s adjusted tax basis in such U.S. Holder’s shares of Phillips 66 Common Stock and, to the extent the distribution exceeds such U.S. Holder’s adjusted tax basis, as capital gain from the sale or exchange of such shares of Phillips 66 Common Stock. Dividends received by a corporate U.S. Holder may be eligible for a dividends received deduction, subject to applicable limitations. Dividends received by an individual U.S. Holder may be taxed at the lower applicable long-term capital gains rate if such dividends are treated as “qualified dividend income” for U.S. federal income tax purposes.

Sale, Exchange, Certain Redemptions or Other Taxable Dispositions of Phillips 66 Common Stock

Upon the sale, exchange, certain redemptions or other taxable dispositions of shares of Phillips 66 Common Stock received in the Merger, a U.S. Holder will generally recognize capital gain or loss equal to the difference between (i) the amount of cash and the fair market value of any other property received upon such taxable disposition of shares of Phillips 66 Common Stock and (ii) the U.S. Holder’s adjusted tax basis in such shares of Phillips 66 Common Stock. Such capital gain or loss will be long-term capital gain or loss if the U.S. Holder’s holding period in the shares of Phillips 66 Common Stock disposed of is more than twelve months at the time of such taxable disposition. Long-term capital gains of non-corporate taxpayers are generally taxed at reduced rates. Capital losses recognized by a U.S. Holder may offset capital gains and, in the case of individuals, no more than $3,000 of ordinary income. Capital losses recognized by U.S. Holders that are corporations may only be used to offset capital gains.

Information Reporting and Backup Withholding

Information returns may be required to be filed with the IRS in connection with the Merger and in connection with distributions made with respect to, or dispositions of, shares of Phillips 66 Common Stock received in the Merger. A U.S. Holder may be subject to U.S. backup withholding on payments made pursuant to the Merger or on distributions made with respect to, or on payments made pursuant to dispositions of, shares of Phillips 66 Common Stock received in the Merger unless such holder provides proof of an applicable exemption or a correct taxpayer identification number and otherwise complies with the applicable requirements of the backup withholding rules. Any amount withheld under the U.S. backup withholding rules is not an additional tax and will generally be allowed as a refund or credit against the U.S. Holder’s U.S. federal income tax liability provided that the required information is timely furnished to the IRS.

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HOUSEHOLDING OF INFORMATION STATEMENT/PROSPECTUS

Some banks, brokers and other nominees may be participating in the practice of “householding” information statements, proxy statements and annual reports. This means that only one copy of this notice of action by written consent and information statement/prospectus may have been sent to multiple unitholders in your household, unless PSXP has received contrary instructions in the past from applicable PSXP Unitholders. If you would prefer to receive separate copies of the information statement/prospectus either now or in the future, please contact your bank, broker or other nominee. In addition, upon written or oral request to PSXP, PSXP will provide a separate copy of the information statement/prospectus. In addition, PSXP Unitholders sharing an address can request delivery of a single copy of the information statement/prospectus if you are receiving multiple copies upon written or oral request to PSXP at the address and telephone number stated below. All requests or notices related to the foregoing may be directed to PSXP at the following address: 2331 CityWest Blvd., Houston, Texas 77042, (855) 283-9237; Attn: Corporate Secretary.

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LEGAL MATTERS

The validity of the Phillips 66 Common Stock to be issued in the Merger will be passed upon for Phillips 66 by Latham & Watkins LLP, Houston, Texas.

EXPERTS

The consolidated financial statements of Phillips 66 appearing in Phillips 66’s Annual Report on Form 10-K for the year ended December 31, 2020, and the effectiveness of Phillips 66’s internal control over financial reporting as of December 31, 2020, have been audited by Ernst & Young LLP, independent registered public accounting firm, as set forth in their reports thereon, included therein, and incorporated herein by reference. Such consolidated financial statements are incorporated herein by reference in reliance upon such reports given on the authority of such firm as experts in accounting and auditing.

The consolidated financial statements of Phillips 66 Partners LP appearing in Phillips 66 Partners LP’s Annual Report on Form 10-K for the year ended December 31, 2020, and the effectiveness of Phillips 66 Partners LP’s internal control over financial reporting as of December 31, 2020, have been audited by Ernst & Young LLP, independent registered public accounting firm, as set forth in their reports thereon, included therein, and incorporated herein by reference, which as to the consolidated financial statements as of December 31, 2020 and 2019, and for each of the three years in the period ended December 31, 2020, are based in part on the reports of Deloitte & Touche LLP, and Grant Thornton LLP, independent registered public accounting firms. The financial statements of DCP Sand Hills Pipeline, LLC and its consolidated subsidiaries (which Phillips 66 Partners LP accounts for using the equity method of accounting) as of December 31, 2020 and 2019, and for each of the three years in the period ended December 31, 2020, and the financial statements of DCP Southern Hills Pipeline, LLC and its consolidated subsidiaries (which Phillips 66 Partners LP accounts for using the equity method of accounting) as of December 31, 2020 and 2019, and for each of the three years in the period ended December 31, 2020, have been audited by Deloitte & Touche LLP, as stated in their reports, which are incorporated herein by reference. The consolidated financial statements of Dakota Access, LLC (which Phillips 66 Partners LP accounts for using the equity method of accounting) as of December 31, 2020 and 2019, and for each of the three years in the period ended December 31, 2020, have been audited by Grant Thornton LLP, as stated in their report, which is incorporated herein by reference. The consolidated financial statements of Phillips 66 Partners LP, referred to above, are incorporated herein by reference in reliance upon such reports given on the authority of such firms as experts in accounting and auditing.

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WHERE YOU CAN FIND MORE INFORMATION

Phillips 66 and PSXP file annual, quarterly and current reports, proxy statements (in the case of Phillips 66) and other information with the SEC. Phillips 66’s file number with the SEC is 001-35349 and PSXP’s file number with the SEC is 001-36011. Filings made with the SEC by Phillips 66 and PSXP are available to the public over the Internet at the SEC’s web site at www.sec.gov. The information contained on the SEC’s website is expressly not incorporated by reference into this information statement/prospectus.

Phillips 66 has filed with the SEC a registration statement on Form S-4 of which this information statement/prospectus forms a part. The registration statement registers the shares of Phillips 66 Common Stock to be issued to PSXP Public Unitholders in connection with the Merger. The registration statement, including the attached exhibits and schedules, contains additional relevant information about Phillips 66 Common Stock. The rules and regulations of the SEC allow Phillips 66 and PSXP to omit certain information included in the registration statement from this information statement/prospectus.

The SEC allows Phillips 66 and PSXP to “incorporate by reference” the information they file with it, which means that Phillips 66 and PSXP can disclose important information to you by referring you to those documents. The information incorporated by reference is considered to be part of this information statement/prospectus, and information that Phillips 66 and PSXP file later with the SEC will update or supersede this information automatically.

Phillips 66 incorporates by reference the documents listed below (other than any portions of the documents not deemed to be filed) and any future filings made by Phillips 66 with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act on or after the date of this information statement/prospectus and prior to the consummation of the Merger:

PSXP incorporates by reference the documents listed below (other than any portions of the documents not deemed to be filed) and any future filings made by PSXP with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act on or after that date of this information statement/prospectus and prior to the consummation of the Merger:

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You may request a copy of any of the documents incorporated by reference by Phillips 66 and PSXP at no cost by requesting them in writing or by telephone from the appropriate company at the following address and telephone number:

Phillips 66

2331 CityWest Boulevard

Houston, Texas 77042

Telephone: (281) 293-6600

Phillips 66 Partners LP

2331 CityWest Boulevard

Houston, Texas 77042

Telephone: (855) 283-9237

If you request any such documents, Phillips 66 or PSXP will mail them to you by first class mail, or another equally prompt means, after receipt of your request. To obtain timely delivery of these documents, you must request the information no later than February 21, 2022.

You may also obtain more information regarding Phillips 66 by consulting its website, at www.phillips66.com. The information on Phillips 66’s website (other than the documents expressly incorporated by reference as set forth above) is not incorporated by reference in this information statement/prospectus, and you should not consider it part of this information statement/prospectus.

You may also obtain more information regarding PSXP by consulting its website, at www.phillips66partners.com. The information on PSXP’s website (other than the documents expressly incorporated by reference as set forth above) is not incorporated by reference in this information statement/prospectus, and you should not consider it part of this information statement/prospectus.

Neither Phillips 66 nor PSXP has authorized anyone to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it. The information that appears in this information statement/prospectus and that is incorporated by reference in this information statement/prospectus may only be accurate as of the date of this information statement/prospectus or the date of the document in which incorporated information appears. The business, financial condition, results of operations and prospects may have changed for each of Phillips 66 and PSXP since such date.

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