Eric D. Shaff
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.
Sale(S)Direct263 shares at avg. $4.55$1K - Aug 15, 2026MCRB
Seres Therapeutics, Inc.
Exercise(M)Direct722 shares- - Jul 8, 2026MCRB
Seres Therapeutics, Inc.
Award(A)DirectStock Option (right to buy)
6.5K shares- - May 18, 2026MCRB
Seres Therapeutics, Inc.
Sale(S)Direct259 shares at avg. $7.53$2K - May 15, 2026MCRB
Seres Therapeutics, Inc.
Exercise(M)Direct722 shares- - Feb 15, 2026MCRB
Seres Therapeutics, Inc.
Exercise(M)Direct723 shares- - Feb 15, 2026MCRB
Seres Therapeutics, Inc.
Sale(S)Direct259 shares at avg. $8.47$2K - Nov 15, 2025MCRB
Seres Therapeutics, Inc.
Exercise(M)Direct331 shares- - Nov 15, 2025MCRB
Seres Therapeutics, Inc.
Exercise(M)Direct390 shares- - Nov 15, 2025MCRB
Seres Therapeutics, Inc.
Sale(S)Direct217 shares at avg. $17.30$4K - Aug 18, 2025MCRB
Seres Therapeutics, Inc.
Sale(S)Direct217 shares at avg. $16.65$4K - Aug 15, 2025MCRB
Seres Therapeutics, Inc.
Exercise(M)Direct333 shares- - Aug 15, 2025MCRB
Seres Therapeutics, Inc.
Exercise(M)Direct391 shares- - May 16, 2025MCRB
Seres Therapeutics, Inc.
Sale(S)Direct220 shares at avg. $7.28$2K - May 15, 2025MCRB
Seres Therapeutics, Inc.
Exercise(M)Direct390 shares- - May 15, 2025MCRB
Seres Therapeutics, Inc.
Exercise(M)Direct331 shares- - Feb 18, 2025MCRB
Seres Therapeutics, Inc.
Sale(S)Direct12.7K shares at avg. $0.81$10K - Feb 15, 2025MCRB
Seres Therapeutics, Inc.
Exercise(M)Direct7.8K shares- - Feb 15, 2025MCRB
Seres Therapeutics, Inc.
Exercise(M)Direct26.6K shares- - Feb 7, 2025MCRB
Seres Therapeutics, Inc.
Award(A)DirectStock Option (Right to Buy)
2M shares- - Nov 18, 2024MCRB
Seres Therapeutics, Inc.
Sale(S)Direct2.5K shares at avg. $0.54$1K - Nov 15, 2024MCRB
Seres Therapeutics, Inc.
Exercise(M)Direct7.8K shares- - Oct 28, 2024MCRB
Seres Therapeutics, Inc.
Sale(S)Direct8.7K shares at avg. $0.69$6K - Oct 27, 2024MCRB
Seres Therapeutics, Inc.
Exercise(M)Direct27.8K shares-
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Aug 17, 2026 | MCRB Seres Therapeutics, Inc. | Sale(S) | 263 | $4.55 | $1,197 | Direct |
| Aug 15, 2026 | MCRB Seres Therapeutics, Inc. | Exercise(M) | 722 | - | $0 | Direct |
| Jul 8, 2026 | MCRB Seres Therapeutics, Inc. | Award(A) Stock Option (right to buy) | 6,500 | - | - | Direct |
| May 18, 2026 | MCRB Seres Therapeutics, Inc. | Sale(S) | 259 | $7.53 | $1,950 | Direct |
| May 15, 2026 | MCRB Seres Therapeutics, Inc. | Exercise(M) | 722 | - | $0 | Direct |
| Feb 15, 2026 | MCRB Seres Therapeutics, Inc. | Exercise(M) | 723 | - | $0 | Direct |
| Feb 15, 2026 | MCRB Seres Therapeutics, Inc. | Sale(S) | 259 | $8.47 | $2,194 | Direct |
| Nov 15, 2025 | MCRB Seres Therapeutics, Inc. | Exercise(M) | 331 | - | - | Direct |
| Nov 15, 2025 | MCRB Seres Therapeutics, Inc. | Exercise(M) | 390 | - | - | Direct |
| Nov 15, 2025 | MCRB Seres Therapeutics, Inc. | Sale(S) | 217 | $17.30 | $3,754 | Direct |
| Aug 18, 2025 | MCRB Seres Therapeutics, Inc. | Sale(S) | 217 | $16.65 | $3,613 | Direct |
| Aug 15, 2025 | MCRB Seres Therapeutics, Inc. | Exercise(M) | 333 | - | - | Direct |
| Aug 15, 2025 | MCRB Seres Therapeutics, Inc. | Exercise(M) | 391 | - | - | Direct |
| May 16, 2025 | MCRB Seres Therapeutics, Inc. | Sale(S) | 220 | $7.28 | $1,602 | Direct |
| May 15, 2025 | MCRB Seres Therapeutics, Inc. | Exercise(M) | 390 | - | - | Direct |
| May 15, 2025 | MCRB Seres Therapeutics, Inc. | Exercise(M) | 331 | - | - | Direct |
| Feb 18, 2025 | MCRB Seres Therapeutics, Inc. | Sale(S) | 12,726 | $0.81 | $10,314 | Direct |
| Feb 15, 2025 | MCRB Seres Therapeutics, Inc. | Exercise(M) | 7,813 | - | - | Direct |
| Feb 15, 2025 | MCRB Seres Therapeutics, Inc. | Exercise(M) | 26,563 | - | - | Direct |
| Feb 7, 2025 | MCRB Seres Therapeutics, Inc. | Award(A) Stock Option (Right to Buy) | 1,950,000 | - | - | Direct |
| Nov 18, 2024 | MCRB Seres Therapeutics, Inc. | Sale(S) | 2,505 | $0.54 | $1,355 | Direct |
| Nov 15, 2024 | MCRB Seres Therapeutics, Inc. | Exercise(M) | 7,812 | - | $0 | Direct |
| Oct 28, 2024 | MCRB Seres Therapeutics, Inc. | Sale(S) | 8,748 | $0.69 | $6,037 | Direct |
| Oct 27, 2024 | MCRB Seres Therapeutics, Inc. | Exercise(M) | 27,837 | - | $0 | Direct |
1-24 of 24 transactions
About Shaff Eric D.
Shaff Eric D. (SEC CIK 0001643734) files insider reports with the SEC as Director of Seres Therapeutics, Inc. (MCRB).
Signal8 holds 11 ownership filings by Shaff Eric D., all Form 4s, filed between Oct 29, 2024 and Aug 18, 2026. Those filings report 24 transactions, from Oct 27, 2024 to Aug 17, 2026. Signal8's Form 4 history starts in Sep 2024.
The business address on Shaff Eric D.'s filings is in CAMBRIDGE, MA.
Recent filings by Shaff Eric D.
- Aug 17, 2026: Open-market sale of MCRB shares (Form 4, code S).
- Aug 15, 2026: Option exercise of MCRB shares (Form 4, code M).
- Jul 8, 2026: Grant or award of MCRB derivative securities (Form 4, code A).
- May 18, 2026: Open-market sale of MCRB shares (Form 4, code S).
- May 15, 2026: Option exercise of MCRB shares (Form 4, code M).