Tempest CFO Justin Trojanowski resigns Sept 1; Nicholas Rossettos appointed

Tempest Therapeutics, Inc.

Justin Trojanowski resigns as Principal Financial/Accounting Officer effective Sept 1, 2026.
Nicholas Rossettos named CFO, Principal Financial & Accounting Officer, Treasurer, Secretary effective Sept 1.
Rossettos, 60, is a CPA with 30+ years; prior fractional CFO at Charles River CFO and CFO of Egenix.
He was Interim CFO at Sernova Corp (TSX: SVA) Mar-Oct 2024 and advisor to TransCode (RNAZ) since Apr 2025.
No family relationships or 404(a) transactions disclosed; standard indemnification agreement entered.

item 5.02

Executive movements

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Departed

Justin Trojanowski

Principal Financial Officer and Principal Accounting Officer

TPST · Tempest Therapeutics, Inc.

Effective: 2026-09-01
Successor: Nicholas Rossettos
Filed: August 24, 2026, 4:43 PM ET

On August 18, 2026, Mr. Justin Trojanowski notified Tempest Therapeutics, Inc. (the “Company”) of his decision to resign from his positions as Principal Financial Officer and Principal Accounting Officer of the Company, and from any and all other positions he holds with the Company, effective as of September 1, 2026.

Appointed

Nicholas Rossettos

Chief Financial Officer, Principal Financial and Accounting Officer, Treasurer, and Corporate Secretary

TPST · Tempest Therapeutics, Inc.

Effective: 2026-09-01
Filed: August 24, 2026, 4:43 PM ET

Effective September 1, 2026, the Board of Directors of the Company (the “Board”) appointed Mr. Nicholas Rossettos as Chief Financial Officer Principal Financial and Accounting Officer, Treasurer, and Corporate Secretary of the Company.

Key facts

Extracted from this filing and checked against the source text.

Executive change SEC 8-K Item 5.02 confidence 0.97

Justin Trojanowski departed as Principal Financial Officer and Principal Accounting Officer at Tempest Therapeutics, Inc..

Action: resign
Role: Principal Financial Officer and Principal Accounting Officer

Exact text from the filing

On August 18, 2026, Mr. Justin Trojanowski notified Tempest Therapeutics, Inc. (the “Company”) of his decision to resign from his positions as Principal Financial Officer and Principal Accounting Officer of the Company, and from any and all other positions he holds with the Company, effective as of September 1, 2026.

View on SEC.gov

Executive change SEC 8-K Item 5.02 confidence 0.97

Nicholas Rossettos was appointed as Chief Financial Officer, Principal Financial and Accounting Officer, Treasurer, and Corporate Secretary at Tempest Therapeutics, Inc..

Action: appointed
Role: Chief Financial Officer, Principal Financial and Accounting Officer, Treasurer, and Corporate Secretary

Exact text from the filing

Effective September 1, 2026, the Board of Directors of the Company (the “Board”) appointed Mr. Nicholas Rossettos as Chief Financial Officer Principal Financial and Accounting Officer, Treasurer, and Corporate Secretary of the Company.

View on SEC.gov

Tempest Therapeutics, Inc. filing history →

Source: SEC EDGAR

accession 0001193125-26-363695

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