Astrotech Corporation

Item 8.01. Other Events. As previously disclosed, on June 2, 2026, Astrotech Corporation (the “Company”), entered into an at-the-market offering agreement (the “Offering Agreement”) with H.C. Wainwright & Co., LLC, as agent (“Wainwright”), pursuant to which the Company may offer and sell shares of the Company’s common stock, par value $0.001 per share (the “Common Stock”), from time to time, through an “at the market offering” program under which Wainwright acts as sales agent. The offer and sale of the Shares were made pursuant to a shelf registration statement on Form S-3 (File No. 333-293023) and the related base prospectus filed by the Company with the Securities and Exchange Commission (the “SEC”) on January 28, 2026 and declared effective by the SEC on January 30, 2026, as supplemented by a prospectus supplement dated June 3, 2026 (the “Prior Prospectus Supplement”) and filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933, as amended (the “Securities Act”) in connection with the offer and sale of up to approximately $24.5 million of shares of Common Stock pursuant to the Offering Agreement. As of August 19, 2026, the Company had sold 258,856 shares of Common Stock for gross proceeds of approximately $7.9 million, before deducting commissions to Wainwright and other expenses, under the Prior Prospectus Supplement. On June 30, 2026, the Company filed a shelf registration statement on Form S-3 (File No. 333-297144) (the “Registration Statement”) and the related base prospectus with the SEC, which was declared effective on July 7, 2026. On August 19, 2026, the Company filed a prospectus supplement to the Registration Statement (the “Prospectus Supplement”) with the SEC in connection with the offer and sale of up to $50 million of shares (the “Shares”) of Common Stock pursuant to the Offering Agreement, which replaces and supersedes the Prior Prospectus Supplement. No further sales of shares of Common Stock will be made under the Prior Prospectus Supplement. The legal opinion of Haynes and Boone, LLP, relating to the Shares being offered in connection with the Prospectus Supplement is filed as Exhibit 5.1 to this Current Report on Form 8-K. This Current Report on Form 8-K shall not constitute an offer to sell or the solicitation of an offer to buy the Common Stock discussed herein, nor shall there be any offer, solicitation, or sale of common stock in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state.