Company Update

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549   FORM 8-K   CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934   Date of Report (Date of earliest event reported): October 17, 2025   UNITED STATES ANTIMONY CORPORATION (Exact name of registrant as specified in its charter)   Texas 001-08675 81-0305822 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.)   4438 W. Lovers Lane , Unit 100 , Dallas , TX 75209 (Address of principal executive offices and zip code)   Registrant’s telephone number, including area code: ( 406 )  606-4117   Former name or former address, if changed since last report: Not Applicable   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:   ☐ Written communication 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 communication pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))   ☐ Pre-commencement communication 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, $0.01 par value UAMY NYSE American Common Stock, $0.01 par value UAMY NYSE Texas   Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).   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. ☐         Item 8.01 . Other Events.   On October 17, 2025, United States Antimony Corporation (the “Company”) filed a prospectus supplement (the “Prospectus Supplement”) under the Company’s automatic shelf registration statement on Form S-3 (File No. 333-290901) that was originally filed with the Securities and Exchange Commission (the “SEC”) on October 16, 2025 and was immediately deemed effective by the SEC (the “Registration Statement”), relating to the offer and sale of a total of up to $400,000,000 of shares of the Company’s common stock, par value $0.01 per share (the “Shares”), pursuant to the Amended and Restated Sales Agreement with A.G.P./Alliance Global Partners and B. Riley Securities, Inc. dated September 17, 2025.   The opinion of Duane Morris LLP relating to the validity of the Shares offered by the Prospectus Supplement is filed herewith as Exhibit 5.1 to this Current Report on Form 8-K and is incorporated herein by reference.   The Shares are registered pursuant to the Registration Statement and the base prospectus contained therein, and offerings for the Shares will be made only by means of the Prospectus Supplement. This Current Report on Form 8-K shall not constitute an offer to sell or the solicitation of an offer to buy these securities, nor shall there be any sale of these securities in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of such state or jurisdiction.     2     Item 9.01 Financial Statements and Exhibits.   (d) Exhibits.   Exhibit No. Description 5.1 Opinion of Duane Morris LLP. 23.1   Consent of Duane Morris LLP (included in Exhibit 5.1). 104   Cover Page Interactive Data File (embedded within the Inline XBRL Document).     3     SIGNATURES   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.     UNITED STATES ANTIMONY CORPORATION         Dated: October 17, 2025 By: /s/ Richard R. Isaak     Richard R. Isaak       SVP, Chief Financial Officer       4