Eric D. Shaff

Companies

• Seres Therapeutics, Inc.Board member Feb 8, 2021 to now¹
• Seres Therapeutics, Inc.Chief executive officer Jan 28, 2020 to now²
• Seres Therapeutics, Inc.President Jan 28, 2020 to now²
• Sigilon Therapeutics, Inc.Board member Dec 3, 2020 to Aug 11, 2023³
• Seres Therapeutics, Inc.Chief financial officer Jun 25, 2015 to Jan 31, 2020⁴
• Seres Therapeutics, Inc.Officer Jan 30, 2018 to Jan 29, 2019⁵

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• STSeres Therapeutics, Inc. MCRB12,499 shares⁶$30.7K at $2.46Aug 17, 2026

As of each latest filing. The line shows shares held over time.

Recent filings

• Aug 17, 2026Sold 263 shares at $4.55 of Seres Therapeutics, Inc.⁶
• Aug 15, 2026Exercised options 722 shares of Seres Therapeutics, Inc.⁶
• May 18, 2026Sold 259 shares at $7.53 of Seres Therapeutics, Inc.⁷
• May 15, 2026Exercised options 722 shares of Seres Therapeutics, Inc.⁷
• Feb 15, 2026Sold 259 shares at $8.47 of Seres Therapeutics, Inc.⁸
• Feb 15, 2026Exercised options 723 shares of Seres Therapeutics, Inc.⁸
• Nov 15, 2025Sold 217 shares at $17.30 of Seres Therapeutics, Inc.⁹
• Nov 15, 2025Exercised options 331 shares of Seres Therapeutics, Inc.⁹
• Nov 15, 2025Exercised options 390 shares of Seres Therapeutics, Inc.⁹
• Aug 18, 2025Sold 217 shares at $16.65 of Seres Therapeutics, Inc.¹⁰
• Aug 15, 2025Exercised options 333 shares of Seres Therapeutics, Inc.¹⁰
• Aug 15, 2025Exercised options 391 shares of Seres Therapeutics, Inc.¹⁰
• May 16, 2025Sold 220 shares at $7.28 of Seres Therapeutics, Inc.¹¹
• May 15, 2025Exercised options 331 shares of Seres Therapeutics, Inc.¹¹
• May 15, 2025Exercised options 390 shares of Seres Therapeutics, Inc.¹¹
• Feb 18, 2025Sold 12,726 shares at $0.81 of Seres Therapeutics, Inc.¹²
• Feb 15, 2025Exercised options 26,563 shares of Seres Therapeutics, Inc.¹²
• Feb 15, 2025Exercised options 7,813 shares of Seres Therapeutics, Inc.¹²
• Nov 18, 2024Sold 2,505 shares at $0.54 of Seres Therapeutics, Inc.¹³
• Nov 15, 2024Exercised options 7,812 shares of Seres Therapeutics, Inc.¹³
• Oct 28, 2024Sold 8,748 shares at $0.69 of Seres Therapeutics, Inc.¹⁴
• Oct 27, 2024Exercised options 27,837 shares of Seres Therapeutics, Inc.¹⁴
• Aug 16, 2024Sold 2,518 shares at $0.84 of Seres Therapeutics, Inc.¹⁵
• Aug 15, 2024Exercised options 7,813 shares of Seres Therapeutics, Inc.¹⁵
• May 15, 2024Sold 2,435 shares at $0.94 of Seres Therapeutics, Inc.¹⁶