United States Antimony Corporation has appointed Shawn P. Winkler as its permanent Senior Vice President and Chief Financial Officer, a move that raises questions about the stability of the company's financial leadership after a four-month interim period. Effective September 30, 2026, the board confirmed Winkler in the role, simultaneously terminating the employment of outgoing CFO Richard R. Isaak.
The transition concludes a period in which Winkler served as Interim Chief Financial Officer, a position he assumed on May 4, 2026. According to the Form 8-K filed with the Securities and Exchange Commission on October 2, 2026, the board appointed Winkler on a permanent basis as of the effective date. In connection with this appointment, Isaak ceased to be Senior Vice President and Chief Financial Officer. The company stated that Isaak's termination was without cause and effective immediately upon the appointment of his successor.
The filing explicitly clarifies that Isaak's departure was not related to the company's financial or operating results, nor was it driven by disagreements or concerns regarding financial or reporting practices. Gary C. Evans, Chief Executive Officer, signed the report on behalf of the registrant, which is headquartered in Dallas, Texas.
Winkler brings a background in energy sector finance and investment banking to the antimony producer. Prior to joining U.S. Antimony, he served as Chief Financial Officer of Burrow Global, a Texas-based engineering, procurement, and construction firm serving the energy industry. Before his tenure at Burrow Global, Winkler spent 15 years as an investment banker at BMO Capital Markets and Deutsche Bank Securities. During that time, he advised public and private clients in the natural resources sector on more than $10 billion of M&A transactions. His experience includes leading capital raises across the full capital structure, encompassing IPOs, follow-on equity, high-yield and convertible notes, bank and institutional loans, and acquisition financing.
The company noted that there are no arrangements or understandings between Winkler and any other persons pursuant to which he was appointed as Chief Financial Officer. Additionally, the filing states there are no family relationships between Winkler and any director or executive officer of the company. There are also no transactions between Winkler and the company that would be reportable under Item 404(a) of Regulation S-K.
Winkler holds an MBA from Rice University's Jones Graduate School of Management, where he was named a Jones Scholar. He also holds a Bachelor of Arts in Economics, Managerial Studies, and Policy Studies from Rice University. The company thanked Isaak for his service and contributions in the filing.
United States Antimony Corporation is a Texas corporation listed on the NYSE under the ticker symbol UAMY. The company's principal executive offices are located at 4438 W. Lovers Lane, Unit 100, Dallas, TX 75209.