Redwire Corp美国招股说明书（2026年6月9日版）

We have entered into an equity distribution agreement (the “Sales Agreement”), dated June 9, 2026, with Truist Securities, Inc., J.P. Morgan SecuritiesLLC, BofA Securities, Inc., TCBI Securities, Inc., doing business as Texas Capital Securities, A.G.P./Alliance Global Partners, B. Riley Securities, Inc.,Canaccord Genuity LLC, H.C. Wainwright & Co., LLC, KeyBanc Capital Markets Inc. and Roth Capital Partners, LLC (each, an “Agent” and collectively, the“Agents”), as sales agent relating to the shares of our common stock, $0.0001 par value per share, offered by this prospectus supplement and theaccompanying prospectus. In accordance with the terms of the Sales Agreement, we may offer and sell shares of our common stock having an aggregateoffering price of up to $500,000,000 from time to time through the Agents. Prior to the filing of this prospectus supplement, $349,999,993.77 in aggregate Sales of common stock, if any, under this prospectus supplement and the accompanying prospectus may be made in transactions that are deemed to be“at-the-market offerings” as defined in Rule 415 under the Securities Act of 1933, as amended (the “Securities Act”), including sales made directly on orthrough the New York Stock Exchange (the “NYSE”), on any other existing trading market for the common stock or to or through a market maker other thanon an exchange. In addition, with our prior written approval, the Agents may also sell shares of our common stock by any other method permitted by law, We will pay the Agents a fixed commission, or allow a discount, for their services in acting as Agents in the sale of common stock not to exceed, but maybe lower than, 3.0% of the gross sales price per share of all shares sold through them as Agents under the Sales Agreement. In connection with the sale ofcommon stock on our behalf, each of the Agents may be deemed to be an “underwriter” within the meaning of the Securities Act and the compensation to the The net proceeds we receive from any sales under this prospectus supplement will be the gross proceeds from such sales less the commissions and anyother costs we may incur in offering the common stock. See “Use of Proceeds” and “Plan of Distribution (Conflicts of Interest)” for additional information. Our common stock is listed on the NYSE under the symbol “RDW”. The last reported sale price of our common stock on the NYSE on June 8, 2026 was$18.57 per share. Investing in our common stock involves risks. See the section entitled “Risk Factors” on pageS-9of this prospectus supplement, page5of theaccompanying prospectus and the risk factors contained in the documents incorporated by reference in this prospectus supplement and theaccompanying prospectus for a discussion of certain factors which should be considered before investing in our common stock. Neither the Securities Texas Capital SecuritiesCanaccord GenuityRoth Capital Partners Truist SecuritiesA.G.PH.C. Wainwright & Co. The date of this prospectus supplement is June 9, 2026. TABLE OF CONTENTS ABOUT THIS PROSPECTUS SUPPLEMENTCAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTSPROSPECTUS SUPPLEMENT SUMMARYTHE OFFERINGRISK FACTORSUSE OF PROCEEDSCERTAIN MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCESPLAN OF DISTRIBUTION (CONFLICTS OF INTEREST)LEGAL MATTERSEXPERTSWHERE YOU CAN FIND MORE INFORMATIONINFORMATION INCORPORATED BY REFERENCE ABOUT THIS PROSPECTUS SUPPLEMENT This prospectus supplement and the accompanying prospectus are part of an automatic “shelf” registration statement on Form S-3that we filed with the Securities and Exchange Commission (the “SEC”) as a “well-known seasoned issuer” as defined in Rule 405under the Securities Act. Under this “shelf” registration process, we may, from time to time, offer and sell any combination of thesecurities described in the accompanying prospectus in one or more offerings. Under this prospectus supplement, we may from time totime offer and sell shares of our common stock having an aggregate offering price of up to $500,000,000 at prices and on terms to be This document is in two parts. The first part is this prospectus supplement, which describes the specific terms of our commonstock we are currently offering and certain other matters relating to us and our business and financial condition. The second part is theaccompanying prospectus dated August 7, 2025, which gives more general information about the securities we may offer from time totime, some of which does not apply to our common stock we are currently offering. You should read this prospectus supplement and If the description of this offering or any terms of our common stock varies between this prospectus supplement and theaccompanying prospectus, you should rely on the information in this prospectus supplement. You should rely only on the information contained in or incorporated by reference in this prospectus supplement, theaccompanying prospectus and any related free writing prospectus filed by us with the SEC. We