RMG RMG Acquisition Corp

Filed by Romeo Power, Inc.

pursuant to Rule 425 under the Securities Act of 1933, as amended

and deemed filed pursuant to Rule 14d-9

under the Securities Exchange Act of 1934, as amended

Subject Company: Romeo Power, Inc.

Filer’s SEC File No.: 001-38795

Date: September 22, 2022

The following communication is being filed in connection with the acquisition of Romeo Power, Inc. (“Romeo” or the “Company”) by Nikola Corporation (“Nikola”).

Email to Romeo’s Employees

The following email was sent to Romeo’s employees on September 22, 2022.

Dear Romeo Employees,

Some of you have asked how to tender your shares through E*Trade. Below are instructions you can use to tender your shares if you elect to do so:

In the alternative, if you have the control number that E*Trade mailed to you, you can go to ReorgAction.com and tender your shares online.

Please remember that you need to tender your shares by Monday, September 26, 2022. Thank you.

Important Information About the Exchange Offer

This communication is for informational purposes only and is neither an offer to purchase nor a solicitation of an offer to sell shares. On August 29, 2022, Nikola Corporation (“Nikola”) filed a Registration Statement on Form S-4 (including a Prospectus/Offer to Exchange, a related Letter of Transmittal and other exchange offer documents (collectively, the “Registration Statement”)) with the U.S. Securities and Exchange Commission (the “SEC”) and has and may file additional amendments thereto, and Nikola and a wholly-owned subsidiary of Nikola filed a Tender Offer Statement on Schedule TO with the SEC and has and may file additional amendments thereto. In addition, on August 29, 2022, Romeo Power, Inc. (“Romeo”) filed a Solicitation/Recommendation Statement on Schedule 14D-9 with the SEC and has and may file amendments thereto. Nikola and Romeo may also file other documents with the SEC related to the transaction. This document is not a substitute for the Registration Statement, the Tender Offer Statement, the Solicitation/Recommendation Statement or any other document that Nikola or Romeo may file with the SEC related to the transaction (collectively, the “Exchange Offer Materials”).

Additional Information and Where to Find It

THE EXCHANGE OFFER MATERIALS (INCLUDING A PROSPECTUS/OFFER TO EXCHANGE, A RELATED LETTER OF TRANSMITTAL AND CERTAIN OTHER EXCHANGE OFFER DOCUMENTS) AND THE SOLICITATION/RECOMMENDATION STATEMENT ON SCHEDULE 14D-9 CONTAIN IMPORTANT INFORMATION. THE COMPANY’S STOCKHOLDERS ARE URGED TO READ THESE DOCUMENTS CAREFULLY (AS EACH MAY BE AMENDED OR SUPPLEMENTED FROM TIME TO TIME) BECAUSE THEY CONTAIN IMPORTANT INFORMATION THAT HOLDERS OF THE COMPANY’S SECURITIES SHOULD CONSIDER BEFORE MAKING ANY DECISION REGARDING TENDERING THEIR SECURITIES. The Prospectus/Offer to Exchange, the related Letter of Transmittal and certain other exchange offer documents, as well as the Solicitation/Recommendation Statement, are available to all holders of the Company’s stock at no expense to them. The exchange offer materials and the Solicitation/Recommendation Statement are available for free at the SEC’s website at www.sec.gov. Additional copies may be obtained for free by contacting Investor Relations, Corporate Secretary at Romeo Power, Inc., 5560 Katella Avenue, Cypress, California 90630 (for documents filed by the Company) or Investor Relations, Corporate Secretary at Nikola Corporation, 4141 E Broadway Road, Phoenix, Arizona 85040 (for documents filed by Nikola).

Forward-Looking Statements

This communication contains forward-looking statements, within the meaning of the Private Securities Litigation Reform Act of 1995, related to the Company and the acquisition of Romeo by Nikola that involves substantial risks, uncertainties and assumptions that could cause actual results to differ materially from those expressed or implied by such statements. Any statements that refer to projections, forecasts or other characterizations of future events or circumstances, including any underlying assumptions, are forward-looking statements. In some cases, you can identify forward-looking statements by terminology such as “may,” “should,” “could,” “would,” “expect,” “plan,” “anticipate,” “contemplate,” “intend,” “believe,” “estimate,” “continue,” “goal,” “project” or the negative of such terms or other similar terms. Forward-looking statements in this communication include, among other things, statements about the potential benefits of the proposed transaction, the Company’s plans, objectives, expectations and intentions, the financial condition, results of operations and business of the Company, and the anticipated timing of closing of the proposed transaction. These forward-looking statements are subject to known and unknown risks, uncertainties and assumptions that could cause actual results to differ materially from those projected or otherwise implied by the forward-looking statements, including the following: risks related to the ability of the Company to consummate the proposed transaction on a timely basis or at all; the satisfaction of the conditions precedent to consummation of the proposed transaction, including having a sufficient number of the Company’s shares being validly tendered into the exchange offer to meet the minimum condition; the Company’s ability to secure regulatory approvals on the terms expected in a timely manner or at all; the ability to realize the anticipated benefits of the proposed transaction, including the possibility that the expected benefits from the proposed transaction will not be realized or will not be realized within the expected time period; disruption from the transaction making it more difficult to maintain business and operational relationships; the negative side effects of the announcement or the consummation of the proposed transaction on the market

price of the Company’s common stock or on the Company’s operating results; significant transaction costs; unknown liabilities; the risk of litigation and/or regulatory actions related to the proposed transaction, risks that the Company is unsuccessful in integrating potential acquired businesses and product lines; risks of decreased revenues due to pricing pressures or lower product volume ordered from customers; risks that our products, and services fail to interoperate with third-party systems; potential price increases or lack of availability of third-party technology, battery cells, components or other raw materials that we use in our products; potential disruption of our products, offerings, and networks; our ability to deliver products and services following a disaster or business continuity event; risks resulting from our international operations, including overseas supply chain partners; risks related to strategic alliances; risks related to our ability to raise additional capital in the future if required; potential unauthorized use of our products and technology by third parties; potential impairment charges related to our long-lived assets, including our fixed assets and equity method investments; changes in applicable laws or regulations, including tariffs and similar charges; potential failure to comply with privacy and information security regulations governing the client datasets we process and store; the possibility that the novel coronavirus (“COVID-19”) pandemic may adversely affect our future results of operations, financial position and cash flows; the possibility that Russia’s invasion of Ukraine may result in continued price increases or lack of availability of certain raw materials; and the possibility that we may be adversely affected by other economic, business or competitive factors. The foregoing factors should not be construed as exhaustive and should be read together with the other cautionary statements included in this and other communications we file with or furnish to the Securities and Exchange Commission (“SEC”), including the information in “Item 1A. Risk Factors” included in Part I of our Annual Report on Form 10-K for the year ended December 31, 2021 and subsequent quarterly reports on Form 10-Q. If one or more events related to these or other risks or uncertainties materialize, or if our underlying assumptions prove to be incorrect, actual results may differ materially from what we anticipate.