United States Antimony opens $400,000,000 ATM under S-3

Rhea-AI Filing Summary

United States Antimony Corporation filed a prospectus supplement for an at‑the‑market program to offer and sell up to $400,000,000 of common stock under its automatic shelf registration on Form S‑3. Sales may be made through A.G.P./Alliance Global Partners and B. Riley Securities pursuant to an amended and restated sales agreement.

Offerings will be made only by means of the prospectus supplement and the base prospectus. A legal opinion from Duane Morris LLP regarding the validity of the shares was filed as Exhibit 5.1.

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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.

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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).

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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

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FAQ

What did UAMY announce in this 8-K?

The company filed a prospectus supplement for an at‑the‑market offering of up to $400,000,000 in common stock under its automatic shelf registration.

How much common stock can UAMY sell under the ATM?

Up to $400,000,000 of common stock, as stated in the prospectus supplement.

Who are the sales agents for UAMY's ATM program (UAMY)?

Sales may be conducted through A.G.P./Alliance Global Partners and B. Riley Securities.

Under what registration is the ATM being conducted for UAMY?

Under an automatic shelf registration statement on Form S‑3 that was deemed effective.

Does this filing itself constitute an offer to sell UAMY securities?

No. It expressly states it does not constitute an offer to sell or the solicitation of an offer to buy in any jurisdiction where unlawful.

Was a legal opinion included with the filing?

Yes. An opinion from Duane Morris LLP regarding the validity of the shares was filed as Exhibit 5.1.