ALT5 Sigma (Nasdaq: ALTS) finalizes separation agreement with former CEO

Rhea-AI Filing Summary

ALT5 Sigma Corporation entered into a Separation Agreement and Mutual Release of Claims with former Chief Executive Officer Peter Tassiopoulos, under which his employment with the company and its affiliates, and his August 26, 2024 employment agreement, will conclude on December 15, 2025.

The company will pay him all salary and wages due and owing through that separation date, described as "Past Due Compensation," and after this payment it will have no further economic, compensatory or benefit related obligations to him. Both sides mutually release claims with no reference to or admission of wrongdoing. Mr. Tassiopoulos will also resign from the board of directors effective December 15, 2025, while agreeing to remain available for transition assistance, and the report is signed by Acting Chief Executive Officer Tony Isaac.

Positive

• None.

Negative

• Leadership transition: Former Chief Executive Officer Peter Tassiopoulos is ending his employment and resigning from the board of directors effective December 15, 2025, marking a significant change in governance.

Insights

Corporate governance analyst

ALT5 Sigma finalizes former CEO Tassiopoulos’ exit from management and the board.

ALT5 Sigma Corporation has formalized the departure of former Chief Executive Officer Peter Tassiopoulos through a separation agreement that ends his employment on December 15, 2025. The agreement states that he will receive all salary and wages due through that date, labeled as Past Due Compensation, with no additional economic, compensatory or benefit related obligations after payment.

The separation includes a mutual release of claims and explicitly notes there is no reference to or admission of wrongdoing by any party, which helps clarify that the arrangement is framed as a negotiated resolution. Governance-wise, Mr. Tassiopoulos is also resigning from the board of directors effective December 15, 2025, concentrating formal leadership authority with Acting Chief Executive Officer Tony Isaac as reflected in the signature block.

This represents a notable leadership change, as the former CEO will no longer hold either an executive or board role, even though he has agreed to remain available for transition assistance. The limited financial obligations described in the agreement focus the company’s commitments on clearing accrued salary and wages only, rather than establishing ongoing benefits or additional compensation streams.

8-K Event Classification

Item 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers

1 item

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers Governance

Key personnel changes including departures, elections, or appointments of directors and executive officers.

Understanding 8-K Material Events →

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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) December 12, 2025

ALT5 SIGMA CORPORATION

(Exact name of registrant as specified in its charter)

Nevada		000-19621		41-1454591
(State or other jurisdiction of incorporation)		(Commission File Number)		(IRS Employer Identification No.)

8548 Rozita Lee Avenue, Suite 305 Las Vegas, NV		89113
(Address of principal executive offices)		(Zip Code)

Registrant’s telephone number, including area code (702) 997-5968

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 communications 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 communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐	Pre-commencement communications 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 (par value $0.001 per share)		ALTS		The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

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 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On December 12, 2025 (the “Effective Date”), ALT5 Sigma Corporation (the “Company”) and Peter Tassiopoulos, the former Chief Executive Officer of the Company, mutually agreed to enter into a Separation Agreement and Mutual Release of Claims (the “Separation Agreement”) pursuant to which Mr. Tassiopoulos’ employment with the Company and its affiliates, and his Employment Agreement dated August 26, 2024, will conclude on December 15, 2025 (the “Separation Date”), the Company will pay Mr. Tassiopoulos all salary and wages due and owing through the Separation Date (“Past Due Compensation”), and Mr. Tassiopoulos and the Company mutually release claims as well as other terms.

Upon payment of the Past Due Compensation, following the Separation Date, the Company has no further economic, compensatory or benefit related obligations to Mr. Tassiopoulos. There is no reference to nor admission of wrongdoing by any party.

Mr. Tassiopoulos has also tendered his resignation from the board of directors effective on December 15, 2025. Mr. Tassiopoulos has agreed to remain available for any transition assistance required by the Company.

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.

	ALT5 SIGMA CORPORATION
Date: December 12, 2025	By:	/s/ Tony Isaac
		Tony Isaac
		Acting Chief Executive Officer

FAQ

What did ALT5 Sigma (ALTS) announce regarding former CEO Peter Tassiopoulos?

ALT5 Sigma disclosed that it entered into a Separation Agreement and Mutual Release of Claims with former Chief Executive Officer Peter Tassiopoulos, ending his employment with the company and its affiliates and concluding his prior employment agreement.

When do Peter Tassiopoulos’ employment and board roles with ALT5 Sigma (ALTS) end?

The separation agreement provides that Mr. Tassiopoulos’ employment, and his employment agreement dated August 26, 2024, will conclude on December 15, 2025, and his resignation from the board of directors is also effective on that date.

What compensation will Peter Tassiopoulos receive from ALT5 Sigma (ALTS) under the separation agreement?

Under the agreement, ALT5 Sigma will pay Mr. Tassiopoulos all salary and wages due and owing through the Separation Date, which the agreement describes as Past Due Compensation.

Does ALT5 Sigma (ALTS) have any ongoing obligations to Peter Tassiopoulos after the separation date?

The agreement states that, upon payment of the Past Due Compensation following the separation date, the company will have no further economic, compensatory or benefit related obligations to Mr. Tassiopoulos.

Does the separation agreement between ALT5 Sigma (ALTS) and Peter Tassiopoulos involve any admission of wrongdoing?

No. The disclosure specifies that there is no reference to nor admission of wrongdoing by any party in connection with the separation agreement.

Who is currently serving as a key executive at ALT5 Sigma (ALTS) after this separation?

The report is signed on behalf of ALT5 Sigma by Tony Isaac, identified as the company’s Acting Chief Executive Officer.