Ascent Solar Technologies Inc美股招股说明书(2026-06-26版)

(To Prospectus Dated December 30, 2025) Ascent Solar Technologies, Inc. Up to $15,000,000Common Stock We have entered into an at the market offering agreement (the “Offering Agreement”), dated May 16, 2024, with H.C.Wainwright& Co., LLC, as sales agent (the “Sales Agent” or “Wainwright”), relating to the sale of our common stock, par value$0.0001 per share, offered by this prospectus supplement and the accompanying base prospectus. In accordance with the terms of theOffering Agreement and this prospectus supplement and the accompanying base prospectus, we may offer and sell shares of ourcommon stock having an aggregate offering price of up to $15,000,000 from time to time through Wainwright acting as our salesagent. Sales of our common stock, if any, under this prospectus supplement and the accompanying base prospectus may be made byany method permitted by law deemed to be “at-the-market” offerings as defined in Rule 415 promulgated under the Securities Act of1933, as amended (the “Securities Act”), including, without limitation, sales made directly on or through the Nasdaq Capital Market(“Nasdaq”), the existing trading market for our common stock, or any other existing trading market in the United States for ourcommon stock, sales made to or through a market maker other than on an exchange or otherwise, directly to the Sales Agent asprincipal in negotiated transactions at market prices prevailing at the time of sale or at prices related to such prevailing market prices,and/or in any other method permitted by law. If we and Wainwright agree on any method of distribution other than sales of shares ofour common stock on Nasdaq or another existing trading market in the United States at market prices, we will file a further prospectussupplement providing all information about such offering as required by Rule 424(b) under the Securities Act. Wainwright is notrequired to sell any specific number or dollar amount of shares, but will act as a sales agent and use commercially reasonable efforts tosell on our behalf all of the shares of common stock requested to be sold by us, consistent with its normal trading and sales practices,on mutually agreed terms between Wainwright and us. There is no arrangement for funds to be received in any escrow, trust or similararrangement. We provide more information about how the shares of common stock will be sold in the section entitled “Plan ofDistribution.” Wainwright will be entitled to compensation at a fixed cash commission rate of 3.0% of the gross sales price of the shares soldby it under the Offering Agreement. In connection with the sale of common stock on our behalf, Wainwright will be deemed to be an“underwriter” within the meaning of the Securities Act and the compensation of Wainwright will be deemed to be underwritingcommissions or discounts. We provide more information about our compensation arrangements with the Sales Agent in the sectionentitled “Plan of Distribution.” We have also agreed to provide indemnification and contribution to Wainwright with respect to certainliabilities, including liabilities under the Securities Act. This offering pursuant to this prospectus supplement will terminate upon thetermination by us or Wainwright of the Offering Agreement pursuant to its terms. Our common stock is listed on Nasdaq under the symbol “ASTI.” On June 25, 2026, the last reported sale price of our commonstock on Nasdaq was $4.97 per share. Investing in our common stock involves a high degree of risk. See “Risk Factors” beginning on pageS-6of thisprospectus supplement, page 2 of the accompanying prospectus and under similar headings in the documents incorporated byreference into this prospectus supplement and the accompanying prospectus for a discussion of information that you shouldconsider before investing in our common stock. Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved ofthese securities or determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Anyrepresentation to the contrary is a criminal offense. H.C. Wainwright& Co. The date of this prospectus supplement is June 26, 2026. TABLE OF CONTENTS Prospectus Supplement PageABOUT THIS PROSPECTUS SUPPLEMENTS-iiCAUTIONARY NOTE CONCERNING FORWARD-LOOKING STATEMENTSS-ivPROSPECTUS SUPPLEMENT SUMMARYS-1OFFERING SUMMARYS-5RISK FACTORSS-6USE OF PROCEEDSS-9DILUTIONS-9PLAN OF DISTRIBUTIONS-11LEGAL MATTERSS-13EXPERTSS-13WHERE YOU CAN FIND MORE INFORMATIONS-13INCORPORATION OF CERTAIN INFORMATION BY REFERENCES-14 Prospectus PageABOUT THIS PROSPECTUSiiCAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTSiiPROSPECTUS SUMMARY1RISK FACTORS2USE OF PROCEEDS2DIVIDEND POLICY2PLAN OF DISTRIBUTION2DESCRIPTION OF SECURITIES WE MAY OFFER4LEGAL MATTERS13EXPERTS13WHERE YOU CAN FIND ADDITIONAL INFORMATION13INCORPORATION OF CERTAIN INFORMATION BY REFERENCE14 ABOUT THIS PROSPECTUS SUPPLEMENT This prospectus supplement