7 insiders reported 69 Form 4 transactions for Seres Therapeutics, Inc. (MCRB) over the past 18 months (most recent 2026-05-19). Recent activity: DesRosier Thomas (See Remarks) Buy 244 shares, Shaff Eric D. (Director) Buy 722 shares, Henn Matthew R (See Remarks) Buy 238 shares, Brady Kelly (See Remarks) Buy 180 shares, DesRosier Thomas (See Remarks) Sell 79 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-05-19 | DesRosier Thomas | See Remarks | Buy | 244 | $0 |
| 2026-05-19 | Shaff Eric D. | Director | Buy | 722 | $0 |
| 2026-05-19 | Henn Matthew R | See Remarks | Buy | 238 | $0 |
| 2026-05-19 | Brady Kelly | See Remarks | Buy | 180 | $0 |
| 2026-05-19 | DesRosier Thomas | See Remarks | Sell | 79 | $595 |
| 2026-05-19 | Shaff Eric D. | Director | Sell | 259 | $1,950 |
| 2026-05-19 | Henn Matthew R | See Remarks | Sell | 77 | $580 |
| 2026-05-19 | Brady Kelly | See Remarks | Sell | 59 | $444 |
| 2026-02-18 | DesRosier Thomas | See Remarks | Buy | 244 | $0 |
| 2026-02-18 | Shaff Eric D. | Director | Sell | 259 | $2,194 |
| 2026-02-18 | Young Teresa L. | See Remarks | Buy | 231 | $0 |
| 2026-02-18 | Young Teresa L. | See Remarks | Sell | 75 | $635 |
| 2026-02-18 | Shaff Eric D. | Director | Buy | 723 | $0 |
| 2026-02-18 | DesRosier Thomas | See Remarks | Sell | 78 | $661 |
| 2026-02-18 | Henn Matthew R | See Remarks | Buy | 239 | $0 |
| 2026-02-18 | Henn Matthew R | See Remarks | Sell | 89 | $754 |
| 2025-11-18 | Shaff Eric D. | Director | Buy | 390 | $0 |
| 2025-11-18 | Shaff Eric D. | Director | Buy | 331 | $0 |
| 2025-11-18 | Shaff Eric D. | Director | Sell | 217 | $3,754 |
| 2025-11-18 | Henn Matthew R | See Remarks | Buy | 3,998 | $0 |
| 2025-11-18 | Henn Matthew R | See Remarks | Buy | 140 | $0 |
| 2025-11-18 | Henn Matthew R | See Remarks | Buy | 98 | $0 |
| 2025-11-18 | Henn Matthew R | See Remarks | Sell | 1,257 | $21,746 |
| 2025-11-18 | DesRosier Thomas | See Remarks | Buy | 132 | $0 |
| 2025-11-18 | DesRosier Thomas | See Remarks | Buy | 112 | $0 |
Source: SEC Form 4 filings · as of 2026-05-19