OS Therapies Inc

true 0001795091 0001795091 2026-06-30 2026-06-30 iso4217:USD xbrli:shares iso4217:USD xbrli:shares UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 30, 2026 OS THERAPIES INCORPORATED (Exact name of registrant as specified in its charter) Delaware 001-42195 82-5118368 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.) 115 Pullman Crossing Road , Suite 103 Grasonville , Maryland 21638 (Address of Principal Executive Offices) (Zip Code) Registrant’s telephone number, including area code: ( 410 ) 297-7793 N/A (Former name or former address, if changed since last report.) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions ( see General Instruction A.2. below): ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act: Title of Each Class Trading Symbol(s) Name of Each Exchange on Which Registered Common Stock, par value $0.001 per share OSTX NYSE American Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☒ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ AMENDMENT NO. 1 TO CURRENT REPORT ON FORM 8-K/A OS Therapies Incorporated June 30, 2026 EXPLANATORY NOTE This Amendment No. 1 on Form 8-K/A (this “Amendment”) amends the Current Report on Form 8-K filed by OS Therapies Incorporated (the “Company”) with the Securities and Exchange Commission (the “SEC”) on July 2, 2026 (the “Original Form 8-K”). This Amendment is being filed solely to include as Exhibit 10.3 the side letter, dated June 30, 2026, between the Company and Leonite Fund I, LP, which was entered into in connection with the private placement transaction described in the Original Form 8-K and was inadvertently omitted from the exhibits filed with the Original Form 8-K. Except as described above, this Amendment does not amend, update or otherwise modify the disclosures contained in the Original Form 8-K, and this Amendment should be read in conjunction with the Original Form 8-K. Item 9.01 Financial Statements and Exhibits. (d) Exhibits. Exhibit Number Description 4.1* Form of Senior Secured Convertible Promissory Note (incorporated by reference to Exhibit 4.1 to the Company’s Current Report on Form 8-K filed with the SEC on July 2, 2026). 4.2 Form of Common Stock Purchase Warrant (incorporated by reference to Exhibit 4.2 to the Company’s Current Report on Form 8-K filed with the SEC on July 2, 2026). 10.1* Securities Purchase Agreement, dated as of June 30, 2026, among OS Therapies Incorporated, OS Animal Health Inc., OS Therapies UK LTD and Leonite Fund I, LP (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed with the SEC on July 2, 2026). 10.2 Pledge and Security Agreement, dated as of June 30, 2026, among OS Therapies Incorporated, OS Animal Health Inc., OS Therapies UK LTD and Leonite Fund I, LP (incorporated by reference to Exhibit 10.2 to the Company’s Current Report on Form 8-K filed with the SEC on July 2, 2026). 10.3 Side Letter, dated June 30, 2026, between OS Therapies Incorporated and Leonite Fund I, LP. 99.1 Press Release issued by OS Therapies Incorporated on July 2, 2026 (incorporated by reference to Exhibit 99.1 to the Company’s Current Report on Form 8-K filed with the SEC on July 2, 2026). 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). * Pursuant to Item 601(a)(5) of Regulation S-K, certain schedules and exhibits have been omitted. The registrant agrees to furnish supplementally a copy of any omitted schedule or exhibit to the SEC upon its request. 1 SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. OS THERAPIES INCORPORATED Dated: July 7, 2026 By: /s/ Paul A. Romness, MPH Name: Paul A. Romness, MPH Title: President and Chief Executive Officer 2