Seres Therapeutics CEO Eric Shaff resigns; CFO and CLO appointed as Co-CEOs effective Aug 1, 2025

Seres Therapeutics, Inc.

Eric Shaff resigns as President and CEO effective July 31, 2025; remains on Board as Class I director.
Marella Thorell (EVP/CFO) and Thomas DesRosier (EVP/CLO) appointed Co-CEOs and Co-Presidents effective Aug 1, 2025.
Shaff to receive prorated 2025 bonus; Board may accelerate payment if a strategic transaction closes before year-end.
Thorell and DesRosier each receive $500,000 appointment bonus: one-third on Aug 1, 2025, balance on Jan 1, 2026 subject to retention.

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