FiEE Inc美股招股说明书(2026-06-23版)

Up to $6,272,809Common Stock This prospectus supplement relates to the issuance and sale of our common stock, par value $0.01 per share, or commonstock, having an aggregate offering price of up to $6,272,809, from time to time through or to our sales agent, A.G.P./Alliance GlobalPartners, or A.G.P. We have entered into a Sales Agreement, or the Sales Agreement, with A.G.P. dated June 23, 2026, relating to shares of ourcommon stock offered pursuant to this prospectus supplement. Sales of our common stock, if any, under this prospectus supplement may be made by any method permitted that is deemedan “at the market offering” as defined in Rule415 under the Securities Act of 1933, as amended, or the Securities Act, including salesmade directly on or through Nasdaq (as defined below) or any other existing trading market in the United States for our commonstock, sales made to or through a market maker other than on an exchange or otherwise, directly to A.G.P. as principal, in negotiatedtransactions at market prices prevailing at the time of sale or at prices related to such prevailing market prices and/or by any othermethod permitted by law. A.G.P. is not required to sell any specific amount but will act as our sales agent and use commerciallyreasonable efforts to sell on our behalf the shares of common stock requested to be sold by us, consistent with its normal trading andsales practices, on mutually agreed terms between A.G.P. and us. There is no arrangement for funds to be received in escrow, trust orsimilar arrangement. A.G.P. will be entitled to compensation at a commission rate of 3.25% of the aggregate gross proceeds from each sale ofshares of our common stock sold pursuant to the Sales Agreement, or the Placement Shares. In connection with the sale of shares ofour common stock on our behalf, A.G.P. will be deemed to be an “underwriter” within the meaning of the Securities Act and thecompensation of A.G.P. will be deemed to be underwriting commissions or discounts. We have agreed to provide indemnification andcontribution to A.G.P. against certain civil liabilities, including liabilities under the Securities Act. See “Plan of Distribution”beginning on page S-11 regarding the compensation to be paid to A.G.P. Our common stock is listed on the Nasdaq Capital Market LLC, or Nasdaq, under the trading symbol “FIEE.” The lastreported closing sale price of our common stock on Nasdaq on June 22, 2026 was $4.10 per share. The aggregate market value of our outstanding common stock held by non-affiliates, or public float, pursuant to GeneralInstruction I.B.6 of Form S-3 was approximately $18.8 million, which was calculated based on 8,528,598 shares of outstandingcommon stock, of which 2,620,951 shares are held by non-affiliates, and the last reported closing sale price of our common stock of$7.18 per share on April 29, 2026. Pursuant to General Instruction I.B.6 of Form S-3, in no event will we sell securities in a publicprimary offering with a value exceeding more than one-third of our public float in any 12-month period so long as our public floatremains below $75,000,000. As of the date of this prospectus supplement, we have sold no securities pursuant to General InstructionI.B.6 of Form S-3 during the 12-calendar month period that ends on and includes the date hereof. Investing in our securities involves a high degree of risk. See“Risk Factors”beginning on page S-5 of this prospectussupplement and the documents incorporated by reference into this prospectus supplement for a discussion of the risks that youshould consider in connection with an investment in our securities. Neither the U.S. Securities and Exchange Commission, or the SEC, nor any state securities commission has approvedor disapproved of these securities or determined if this prospectus supplement or the accompanying prospectus is truthful orcomplete. Any representation to the contrary is a criminal offense. Sole Sales Agent A.G.P. The date of this prospectus supplement is June23, 2026. TABLE OF CONTENTS PROSPECTUS SUPPLEMENT ABOUT THIS PROSPECTUS SUPPLEMENTS-1PROSPECTUS SUPPLEMENT SUMMARYS-2THE OFFERINGS-4RISK FACTORSS-5CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTSS-7USE OF PROCEEDSS-9DILUTIONS-10PLAN OF DISTRIBUTIONS-11LEGAL MATTERSS-13EXPERTSS-13WHERE YOU CAN FIND MORE INFORMATIONS-13INCORPORATION OF CERTAIN INFORMATION BY REFERENCES-14 PROSPECTUS ABOUT THIS PROSPECTUS1FORWARD-LOOKING STATEMENTS2THE COMPANY4RISK FACTORS6USE OF PROCEEDS7DESCRIPTION OF SECURITIES WE MAY OFFER8DESCRIPTION OF COMMON STOCK WE MAY OFFER9DESCRIPTION OF PREFERRED STOCK WE MAY OFFER10DESCRIPTION OF WARRANTS WE MAY OFFER11DESCRIPTION OF UNITS WE MAY OFFER13CERTAIN PROVISIONS OF DELAWARE LAW AND OF THE COMPANY’S CERTIFICATE OF INCORPORATIONAND BYLAWS14PLAN OF DISTRIBUTION16LEGAL MATTERS18EXPERTS19WHERE YOU CAN FIND MORE INFORMATION20INCORPORATION BY REFERENCE21 ABOUT THIS PROSPECTUS SUPPLEMENT This prospectus supplement and the accompanying base pros