Eric D. Shaff serves as Executive at Seres Therapeutics, Inc., where they oversee executive responsibilities. Since joining the company, Eric D. Shaff has executed 33 insider transactions totaling $889.7K, demonstrating a bearish approach to their equity position. Their most recent transaction on Nov 15, 2025 involved exercising options for 390 shares valued at $0.
Eric D. Shaff currently holds 10,999 shares of Seres Therapeutics, Inc. (MCRB), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Eric D. Shaff has been a net seller of MCRB stock. They have purchased $0 and sold $889.7K worth of shares.
Eric D. Shaff's most recent insider trade was on Nov 15, 2025, when they sold 390 shares at $0.00 per share.
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| $N/A |
| Discretionary |
| Nov 15, 2025 | MCRB | $3.8K | Sale | 217 | $17.30 | Discretionary |
| Aug 18, 2025 | MCRB | $3.6K | Sale | 217 | $16.65 | Discretionary |
| Aug 15, 2025 | MCRB | $0 | Option Exercise | 391 | $N/A | Discretionary |
| Aug 15, 2025 | MCRB | $0 | Option Exercise | 333 | $N/A | Discretionary |
| Aug 16, 2024 | MCRB | $2.1K | Sale | 2,518 | $0.84 | Planned |
| Aug 15, 2024 | MCRB | $0 | Option Exercise | 7,813 | $N/A | Planned |
| May 15, 2024 | MCRB | $2.3K | Sale | 2,435 | $0.94 | Planned |
| May 15, 2024 | MCRB | $0 | Option Exercise | 7,812 | $N/A | Planned |
| Feb 16, 2024 | MCRB | $12.5K | Sale | 11,549 | $1.08 | Planned |
| Feb 15, 2024 | MCRB | $0 | Option Exercise | 31,250 | $N/A | Planned |
| Oct 30, 2023 | MCRB | $11.5K | Sale | 8,552 | $1.35 | Planned |
| Oct 27, 2023 | MCRB | $0 | Option Exercise | 27,838 | $N/A | Planned |
| Jul 5, 2022 | MCRB | $200.0K | Award | 63,492 | $3.15 | Discretionary |
| Jan 26, 2020 | MCRB | $0 | Option Exercise | 20,000 | $N/A | Discretionary |
| Jan 28, 2019 | MCRB | $25.2K | Sale | 4,378 | $5.75 | Discretionary |
| Jan 26, 2019 | MCRB | $0 | Option Exercise | 12,000 | $N/A | Discretionary |
| Jan 26, 2018 | MCRB | $30.6K | Sale | 2,780 | $11.02 | Discretionary |
| Jan 26, 2018 | MCRB | $0 | Option Exercise | 8,000 | $N/A | Discretionary |
| Jun 30, 2016 | MCRB | $35.3K | Option Exercise | 4,533 | $7.79 | Discretionary |
| Jun 30, 2016 | MCRB | $133.9K | Sale | 4,533 | $29.54 | Discretionary |
| Jun 28, 2016 | MCRB | $48.1K | Sale | 1,667 | $28.85 | Discretionary |
| Jun 28, 2016 | MCRB | $13.0K | Option Exercise | 1,667 | $7.79 | Discretionary |
| Jun 27, 2016 | MCRB | $26.0K | Option Exercise | 3,334 | $7.79 | Discretionary |
| Jun 27, 2016 | MCRB | $93.4K | Sale | 3,334 | $28.00 | Discretionary |
| Apr 4, 2016 | MCRB | $189.5K | Sale | 6,568 | $28.85 | Discretionary |
| Apr 4, 2016 | MCRB | $51.2K | Option Exercise | 6,568 | $7.79 | Discretionary |
| Mar 31, 2016 | MCRB | $27.5K | Sale | 1,095 | $25.13 | Discretionary |
| Mar 31, 2016 | MCRB | $59.7K | Option Exercise | 7,663 | $7.79 | Discretionary |