ALT 5 Sigma宣布高管变动，乔纳森·休（Jonathan Hugh）首席财务官和代理首席执行官无故离职;首席运营官罗恩·皮特斯（Ron Pitters）宣布离职;托尼·艾萨克（Tony Isaac）被任命为代理首席执行官，史蒂文·普拉姆（Steven Plumb）被任命为首席财务官

Departure of Chief Financial Officer and Acting Chief Executive Officer

Effective November 21, 2025, the Board of Directors (the "Board") of the ALT5 Sigma Corporation (the "Company") determined to conclude Jonathan Hugh's employment as Chief Financial Officer and Acting Chief Executive Officer, without cause.

The Company is in the process of working with Mr. Hugh to finalize the terms of his departure. The material terms of the departure will be disclosed in a subsequent filing, if such terms require reporting.

Departure of Chief Operating Officer

On November 25, 2025, the Company provided Ron Pitters notice of the Company's decision to conclude his Consulting Agreement, which will conclude in accordance with its terms. At such time, Mr. Pitters will no longer serve as Chief Operating Officer of the Company. The material terms of the departure will be disclosed in a subsequent filing, if such terms require reporting. Mr. Pitters remains on the Board.

Appointment of Acting Chief Executive Officer

On November 21, 2025, the Board appointed Tony Isaac, President of the Company and member of the Board, as the Acting Chief Executive Officer of the Company and designated him as the Company's "principal executive officer" (the "Acting CEO Appointment"). Mr. Isaac will also continue serving in his roles as President of the Company and a member of the Board.

The Acting CEO Appointment was made in connection with the departure of Mr. Hugh as Chief Financial Officer and Acting Chief Executive Officer of the Company.

The Company did not enter into any consulting or employment agreement with Mr. Isaac in connection with the Acting CEO Appointment. There is no arrangement or understanding between Mr. Isaac and any other person pursuant to which Mr. Isaac was appointed as Acting Chief Executive Officer, and there is no family relationship between Mr. Isaac and any of the Company's directors or other executive officers.

Mr. Isaac's biography and his transactions with the Company are disclosed in the Company's annual report on Form 10-K for the year-ended December 28, 2024, filed with the Securities and Exchange Commission on March 28, 2025.

Appointment of Chief Financial Officer

On November 21, 2025, the Company appointed Steven Plumb as its Chief Financial Officer. He will serve as the Company's principal financial officer and principal accounting officer. Mr. Plumb is an experienced Certified Public Accountant. Mr. Plumb has served as fractional Chief Executive Officer of Prophase Labs, Inc. (NASDAQ:PRPH) since August 2025 and has served as Chief Financial Officer of Driveitaway Holdings, Inc. (OTC:DWAY) since April 2024. From September 2023 to November 2024, Mr. Plumb served as the Chief Financial Officer of A Game Beverages, Inc. From August 2022 to June 2024, Mr. Plumb served as the Chief Financial Officer of Endexx Corp. (OTC:EDXC). From October 2020 to July 2023, Mr. Plumb served as the Chief Financial Officer of Gaming Technologies, Inc. (OTC:GMGT). From January 2020 to March 2023, Mr. Plumb served as the chief financial officer of Directview Holdings, Inc. (OTC:DIRV). Since 2001, he has served as the owner and president of Clear Financial Solutions, a consulting firm that provides interim Chief Financial Officer services to small public companies. In this capacity he has prepared SEC filings, managed investor relations, raised capital, conducted mergers and acquisition activities, developed successful offering memorandum, registration statements and investor presentations. Mr. Plumb is a former auditor with PriceWaterhouseCoopers and KPMG. Mr. Plumb has a Bachelor of Business Administration degree from the University of Texas at Austin, Austin, Texas.

The Company intends to enter into an employment agreement with Mr. Plumb in connection with his appointment as Chief Financial Officer. The material terms of the agreement will be disclosed in a subsequent filing once the agreement is finalized. Pursuant to his offer from the Company, Mr. Plumb will receive a base annual salary of $339,400.

There are no arrangements or understandings between Mr. Plumb and any other persons pursuant to which he was appointed as Chief Financial Officer. There are no family relationships between Mr. Plumb and any director or executive officer of the Company and he has no direct or indirect material interest in any transaction required to be disclosed pursuant to Item 404(a) of Regulation S-K promulgated by the Securities and Exchange Commission.