SSW Seaspan Corporation

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Date of Report: February 5, 2020

Commission File Number 1-32591

SEASPAN CORPORATION

(Exact name of Registrant as specified in its Charter)

Unit 2, 16/F., W668 Building

Nos. 668 Castle Peak Road,

Cheung Sha Wan, Kowloon

Hong Kong

China

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F  ☒            Form 40-F  ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1).

Yes  ☐            No  ☒

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7).

Yes  ☐            No  ☒

THIS REPORT OF FOREIGN PRIVATE ISSUER ON FORM 6-K IS HEREBY INCORPORATED BY REFERENCE INTO THE FOLLOWING REGISTRATION STATEMENTS OF THE REGISTRANT:

THIS REPORT OF FOREIGN PRIVATE ISSUER ON FORM 6-K IS HEREBY INCORPORATED BY REFERENCE INTO THE FOLLOWING REGISTRATION STATEMENT OF ATLAS CORP.:

REGISTRATION STATEMENT ON FORM F-4 (FILE NO. 333-234820) FILED WITH THE SEC ON NOVEMBER 22, 2019, AS AMENDED ON DECEMBER 31, 2019 AND JANUARY 16, 2020.

Item 1 — Information Contained in this Form 6-K Report

Assignment and Assumption Agreement Relating to the Proposed Reorganization

As previously announced, on November 20, 2019, Seaspan Corporation (the “Company”) entered into an agreement and plan of merger with Atlas Corp., a wholly owned subsidiary of the Company (“Atlas”), and Seaspan Holdco V Ltd., a wholly owned subsidiary of Atlas, in order to implement a reorganization of the Company’s corporate structure into a holding company structure, pursuant to which Seaspan will become a direct, wholly owned subsidiary of Atlas (the “Proposed Reorganization”). The consummation of the Proposed Reorganization is subject to approval by the holders of the Company’s common shares.

In connection with the Proposed Reorganization, on February 5, 2020, the Company, Atlas, the guarantors named therein and the investors named therein (the “Investors”) entered into an assignment and assumption agreement (the “Agreement”), whereby upon consummation of the Proposed Reorganization, the Company will assign its rights and obligations (the “Assignment”) under the Specified Agreements (as defined therein) to Atlas, Atlas will accept the Assignment and assume all the rights and obligations (the “Assumption”) of the Company under the Specified Agreements, and the Investors will consent to the Assignment and Assumption and release the Company from all of its duties and obligations with respect to the Specified Agreements, subject to certain specified exceptions. The Specified Agreements consist of certain subscription agreements, registration rights agreements and a warrant agreement entered into between the Company and certain of the Investors and, in certain cases, the guarantors. The Specified Agreements relate to common shares and warrants to purchase common shares of the Company and, to the extent noted below, to the Company’s 5.50% Senior Notes due 2025 and 5.50% Senior Notes due 2026.

The Agreement also amends the NYSE listing covenant in a registration rights agreement, dated as of January 15, 2019, between the Company and the investors specified therein (as amended) and a registration rights agreement, dated as of February 14, 2018, between the Company and the investors specified therein (as amended) to provide that the Registrable Debt Securities (as defined therein) will be listed on the Global Exchange Market (or another national exchange as may be mutually agreed by the parties thereof from time to time) and such listing will be maintained until such Registrable Debt Securities are no longer outstanding.

The Agreement is filed as Exhibit 4.1 to this Report on Form 6-K and is incorporated herein by reference. The description of the Agreement in this Report on Form 6-K is a summary and is qualified in its entirety by the terms of the Agreement.

Where to Find Additional Information

This report does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval. Atlas has filed a registration statement that includes a proxy statement/prospectus and other relevant documents in connection with the Proposed Reorganization. SEASPAN’S SHAREHOLDERS ARE URGED TO CAREFULLY READ THE PROXY STATEMENT/PROSPECTUS FILED WITH THE SEC BECAUSE IT CONTAINS IMPORTANT INFORMATION ABOUT THE PROPOSED REORGANIZATION. The proxy statement/prospectus has been mailed to the holders of Seaspan shares. In addition, investors may obtain a free copy of the proxy statement/prospectus and other filings containing information about Seaspan, Atlas and the Proposed Reorganization, from the SEC at the SEC’s website at http://www.sec.gov after such documents have been filed with the SEC. In addition, after such documents have been filed with the SEC, copies of the proxy statement/prospectus and other filings containing information about

Seaspan, Atlas and the Proposed Reorganization can be obtained without charge by accessing them on Seaspan’s website at http://www.seaspancorp.com or by contacting Seaspan Investor Relations at the address below:

Investor Inquiries:

Mr. Bill Stormont

Investor Relations

Seaspan Corporation

Tel. +1-604-638-7240

Email: IR@seaspanltd.ca

Cautionary Note Regarding Forward-Looking Statements

This report contains certain forward-looking statements (as such term is defined in Section 21E of the Securities Exchange Act of 1934, as amended) concerning future events, including, without limitation, forward-looking statements regarding the Proposed Reorganization. Statements that are predictive in nature, that depend upon or refer to future events or conditions, or that include words such as “expects”, “anticipates”, “intends”, “plans”, “believes”, “estimates”, “projects”, “forecasts”, “will”, “may”, “potential”, “should”, and similar expressions are forward looking statements. These forward-looking statements reflect management’s current expectations only as of the date of this report. As a result, you are cautioned not to rely on any forward-looking statements. Although these statements are based upon assumptions we believe to be reasonable based upon available information, they are subject to risks and uncertainties. These risks and uncertainties include, but are not limited to: the potential that the Proposed Reorganization is not completed when anticipated or at all and other factors detailed from time to time in our periodic reports and filings with the SEC, including Seaspan’s Annual Report on Form 20-F for the year ended December 31, 2018 and the Reports of Foreign Private Issuer on Form 6-K of Seaspan filed from time to time thereafter. We expressly disclaim any obligation to update or revise any of these forward looking statements, whether because of future events, new information, a change in our views or expectations, or otherwise. We make no prediction or statement about the performance of any of our securities.