Mannatech, Incorporated dismissed BDO USA, P.C. as its independent registered public accounting firm and engaged CBIZ CPAs P.C. as its replacement, a move that follows a prior audit opinion citing substantial doubt about the company's ability to continue as a going concern.

The Audit Committee of the Board of Directors approved the dismissal of BDO effective October 15, 2026, and the company notified the firm of the decision on the same day. The original Form 8-K report was filed with the Securities and Exchange Commission on October 20, 2026. This amendment, dated October 23, 2026, updates the disclosure to include the required letter from BDO, dated October 21, 2026, which is filed as Exhibit 16.1.

BDO served as Mannatech's auditor for the fiscal years ended December 31, 2025, and December 31, 2024. While the firm's reports for those periods did not contain adverse opinions or disclaimers, the report for the fiscal year ended December 31, 2025, included an explanatory paragraph regarding substantial doubt about the company's ability to continue as a going concern. Mannatech states that there were no disagreements with BDO on matters of accounting principles, financial statement disclosure, or auditing scope during the fiscal years ended December 31, 2025, and 2024, and through the interim period ending October 15, 2026. The company also reported no "reportable events" as defined in Item 304(a)(1)(v) of Regulation S-K during these periods.

On October 15, 2026, the Audit Committee simultaneously approved the engagement of CBIZ CPAs P.C. as Mannatech's new independent registered public accounting firm for the fiscal year ending December 31, 2026. The engagement begins with the review of the company's condensed consolidated financial statements for the quarter ended September 30, 2026. Mannatech disclosed that neither the company nor anyone on its behalf had consulted CBIZ regarding the application of accounting principles to any specified transaction or the type of audit opinion that might be rendered on its financial statements during the fiscal years ended December 31, 2025, and 2024, and through October 15, 2026.

The amendment was signed by Yasir Haider, Chief Financial Officer of Mannatech, Incorporated. The company is headquartered in Flower Mound, Texas, and its common stock trades on The Nasdaq Stock Market LLC under the symbol MTEX.