Shaff Eric D.
SEC insider (Form 3/4/5 filer). CIK 0001643734. Director at Seres Therapeutics, Inc. (MCRB). 24 reported Form 4/5 transactions since Sep 2024; latest on Aug 17, 2026. Located in CAMBRIDGE, MA.
Companies Shaff Eric D. has filed insider reports for
- Seres Therapeutics, Inc. (MCRB): Director
Shaff Eric D.
CIK: 0001643734
Transaction Breakdown
High conviction signal
Position reduction
Derivative conversions
Compensation grants
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Companies & Roles (1)
Seres Therapeutics, Inc.
Discretionary Trading P&L
Holdings
Transaction History (24 total)
- Aug 17, 2026MCRB
Seres Therapeutics, Inc.
SaleDirect263 shares at avg. $4.55$1K - Aug 15, 2026MCRB
Seres Therapeutics, Inc.
ExerciseDirect722 shares- - Jul 8, 2026MCRB
Seres Therapeutics, Inc.
AwardDirectStock Option (right to buy)
6.5K shares- - May 18, 2026MCRB
Seres Therapeutics, Inc.
SaleDirect259 shares at avg. $7.53$2K - May 15, 2026MCRB
Seres Therapeutics, Inc.
ExerciseDirect722 shares- - Feb 15, 2026MCRB
Seres Therapeutics, Inc.
ExerciseDirect723 shares- - Feb 15, 2026MCRB
Seres Therapeutics, Inc.
SaleDirect259 shares at avg. $8.47$2K - Nov 15, 2025MCRB
Seres Therapeutics, Inc.
SaleDirect217 shares at avg. $17.30$4K - Nov 15, 2025MCRB
Seres Therapeutics, Inc.
ExerciseDirect390 shares- - Nov 15, 2025MCRB
Seres Therapeutics, Inc.
ExerciseDirect331 shares-
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Aug 17, 2026 | MCRB Seres Therapeutics, Inc. | Sale | 263 | $4.55 | $1,197 | Direct |
| Aug 15, 2026 | MCRB Seres Therapeutics, Inc. | Exercise | 722 | - | $0 | Direct |
| Jul 8, 2026 | MCRB Seres Therapeutics, Inc. | Award Stock Option (right to buy) | 6,500 | - | - | Direct |
| May 18, 2026 | MCRB Seres Therapeutics, Inc. | Sale | 259 | $7.53 | $1,950 | Direct |
| May 15, 2026 | MCRB Seres Therapeutics, Inc. | Exercise | 722 | - | $0 | Direct |
| Feb 15, 2026 | MCRB Seres Therapeutics, Inc. | Exercise | 723 | - | $0 | Direct |
| Feb 15, 2026 | MCRB Seres Therapeutics, Inc. | Sale | 259 | $8.47 | $2,194 | Direct |
| Nov 15, 2025 | MCRB Seres Therapeutics, Inc. | Sale | 217 | $17.30 | $3,754 | Direct |
| Nov 15, 2025 | MCRB Seres Therapeutics, Inc. | Exercise | 390 | - | - | Direct |
| Nov 15, 2025 | MCRB Seres Therapeutics, Inc. | Exercise | 331 | - | - | Direct |
1-10 of 24 transactions