Seer CFO/President David Horn resigns; CEO Farokhzad adds President, Endweiss named PFO/Treasurer

Seer, Inc.

David Horn resigns as President, CFO and Treasurer effective Oct 1, 2026, to pursue other interests; no disagreement with company.
CEO Omid Farokhzad, M.D. appointed President in addition to CEO/Chair effective Oct 1, 2026.
Charles Endweiss, VP FP&A, appointed Treasurer and principal financial/accounting officer effective Oct 1, 2026.
Horn's vested option exercise period extended to one year after resignation, contingent on signed release agreement.
Endweiss has been VP FP&A since Jan 2021, prior at Carbon; no family ties or disclosable transactions.

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