REalloys Inc美股招股说明书(2026-09-03版)

616,854 Shares of Common Stock This prospectus supplement (this “Prospectus Supplement”) supplements the prospectus dated June 29, 2026 (the “Prospectus”), whichforms a part of our registration statement on Form S-3ASR (Registration No. 333-297127) (the “Registration Statement”). ThisProspectus Supplement relates to the offer and sale from time to time of up to 616,854 shares (the “Shares”) of common stock, parvalue $0.001 per share (the “Common Stock”), of REalloys Inc. (the “Company,” “we,” “us” or “our”) by the selling stockholdersidentified in this Prospectus Supplement (the “Selling Stockholders”). The Shares were issued to the Selling Stockholders ascompensation pursuant to several consulting agreements entered into between the Company and the Selling Stockholders (the“Consulting Agreements”), which were approved by the Company’s Board of Directors. The Shares were issued in reliance upon theexemption from registration under Section 4(a)(2) of the Securities Act of 1933, as amended (the “Securities Act”). We will not receive any of the proceeds from the sale of the Shares by the Selling Stockholders. The registration of the Shares covered by this Prospectus Supplement does not mean that any of the Selling Stockholders will offer orsell any of the Shares. Our Common Stock is listed on The Nasdaq Capital Market (“Nasdaq”) under the symbol “ALOY.” On September 2, 2026, the lastreported sale price of our Common Stock on Nasdaq was $10.21 per share. We recommend that you obtain current market quotationsfor our Common Stock prior to making an investment decision. You should carefully read this Prospectus Supplement and the accompanying Prospectus, as well as the documents incorporated byreference herein and therein, before you make your investment decision. Investing in our securities involves a high degree of risk. See “Risk Factors” beginning on page S-2 of this ProspectusSupplement and beginning on page 4 of the accompanying Prospectus and in the documents incorporated by reference hereinand therein. Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of thesesecurities or determined if this Prospectus Supplement or the accompanying Prospectus is truthful or complete. Anyrepresentation to the contrary is a criminal offense. The date of this Prospectus Supplement is September 3, 2026. TABLE OF CONTENTS Prospectus Supplement About This Prospectus SupplementCautionary Statement Regarding Forward-Looking StatementsProspectus Supplement SummaryRisk FactorsUse of ProceedsSelling StockholdersPlan of DistributionLegal MattersExpertsWhere You Can Find More InformationIncorporation of Documents by Reference Prospectus About This ProspectusCautionary Statement Regarding Forward-Looking StatementsProspectus SummaryRisk FactorsUse of ProceedsDescription of Capital StockDescription of Debt SecuritiesDescription of WarrantsDescription of Subscription RightsDescription of UnitsSelling StockholdersPlan of DistributionLegal MattersExpertsWhere You Can Find More InformationIncorporation of Documents by Reference ABOUT THIS PROSPECTUS SUPPLEMENT This Prospectus Supplement supplements and should be read in conjunction with the Prospectus dated June 29, 2026, which forms apart of the Registration Statement. This Prospectus Supplement is not complete without, and may not be delivered or utilized except inconnection with, the Prospectus, including any amendments or supplements thereto. This Prospectus Supplement and the accompanying Prospectus are part of the Registration Statement that we filed with the Securitiesand Exchange Commission (the “SEC”) as a “well-known seasoned issuer” as defined in Rule 405 under the Securities Act, using anautomatic “shelf” registration process. Under the shelf registration process, the Selling Stockholders may, from time to time, offer andsell or otherwise dispose of the Shares covered by this Prospectus Supplement. To the extent there is a conflict between the information contained in this Prospectus Supplement, on the one hand, and theinformation contained in the accompanying Prospectus or any document incorporated by reference therein, on the other hand, youshould rely on the information in this Prospectus Supplement. You should not assume that the information contained in this Prospectus Supplement or the accompanying Prospectus is accurate onany date subsequent to the date set forth on the front cover of the applicable document, or that any information we have incorporatedby reference is correct on any date subsequent to the date of the document incorporated by reference, even though this ProspectusSupplement or the accompanying Prospectus is delivered or Shares are sold or otherwise disposed of on a later date. You should rely only on the information contained or incorporated by reference in this Prospectus Supplement and the accompanyingProspectus. We have not, and the Selling Stockholders have not, authorized