# Seres Therapeutics, Inc. (MCRB) insider trading, Q3 2026

Canonical: https://sec-api.dev/insider-trading/mcrb

> 8 non-derivative transactions: 0 purchases, 4 sales ($2K). CIK 1609809.

| Date | Insider | Relationship | Code | Shares | Price | Owned after | Filing |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 2026-08-17 | DesRosier Thomas | Officer | S | 82.0 | 4.55 | 8117.0 | https://www.sec.gov/Archives/edgar/data/1609809/000119312526355712/0001193125-26-355712-index.htm |
| 2026-08-17 | Henn Matthew R | Officer | S | 81.0 | 4.55 | 7995.0 | https://www.sec.gov/Archives/edgar/data/1609809/000119312526355718/0001193125-26-355718-index.htm |
| 2026-08-17 | Shaff Eric D. | Director | S | 263.0 | 4.55 | 12499.0 | https://www.sec.gov/Archives/edgar/data/1609809/000119312526355722/0001193125-26-355722-index.htm |
| 2026-08-17 | Brady Kelly | Officer | S | 64.0 | 4.55 | 8679.0 | https://www.sec.gov/Archives/edgar/data/1609809/000119312526355734/0001193125-26-355734-index.htm |
| 2026-08-15 | DesRosier Thomas | Officer | M | 245.0 |  | 8199.0 | https://www.sec.gov/Archives/edgar/data/1609809/000119312526355712/0001193125-26-355712-index.htm |
| 2026-08-15 | Henn Matthew R | Officer | M | 238.0 |  | 8076.0 | https://www.sec.gov/Archives/edgar/data/1609809/000119312526355718/0001193125-26-355718-index.htm |
| 2026-08-15 | Shaff Eric D. | Director | M | 722.0 |  | 12762.0 | https://www.sec.gov/Archives/edgar/data/1609809/000119312526355722/0001193125-26-355722-index.htm |
| 2026-08-15 | Brady Kelly | Officer | M | 181.0 |  | 8743.0 | https://www.sec.gov/Archives/edgar/data/1609809/000119312526355734/0001193125-26-355734-index.htm |

Source: https://www.sec.gov/data-research/sec-markets-data/insider-transactions-data-sets

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