Seres Therapeutics's top three insider shareholders as of August 04, 2026 are Health Ltp Fund General Partner Llc Nutritional (TenPercentOwner, 11.70Mn shares), David Arkowitz (Chief Financial Officer, 182.44K shares), David Arkowitz (Chief Financial Officer, 166.61K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| David Arkowitz | Chief Financial Officer | 182,442 | 0 | 16 Feb, 2024 |
| Willard H Dere | - | 31,746 | 0 | 06 Jul, 2022 |
| Richard N Kender | - | 63,492 | 0 | 06 Jul, 2022 |
| Thomas Desrosier | Chief Legal Officer And Evp | 104,546 | 0 | 06 Jul, 2022 |
| Eric D. Shaff | Ceo And President | 96,334 | 0 | 06 Jul, 2022 |
| Meryl Zausner | - | 31,746 | 0 | 06 Jul, 2022 |
| Paul Biondi | - | 47,619 | 0 | 06 Jul, 2022 |
| Paula Cloghessy | - | 45,684 | 0 | 31 Oct, 2023 |
| Matthew R. Henn | - | 47,619 | 0 | 06 Jul, 2022 |
| Health Ltp Fund General Partner Llc Nutritional | - | 0 | 11,701,206 | 07 Jul, 2022 |
| Moltke Lisa Von | - | 39,875 | 0 | 19 Feb, 2025 |
| Teresa L. Young | - | 8,557 | 0 | 18 Feb, 2026 |
| David S. Ege | - | 77,575 | 0 | 19 Aug, 2024 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 04 Mar, 2026 | Kelly Brady | Stock Option (right to buy) | A | 56,250 | $0.00 | 56,250 | D | A |
| 04 Mar, 2026 | Matthew R Henn | Stock Option (right to buy) | A | 75,000 | $0.00 | 75,000 | D | A |
| 04 Mar, 2026 | Thomas Desrosier | Stock Option (right to buy) | A | 22,500 | $0.00 | 22,500 | D | A |
| 04 Mar, 2026 | Richard N Kender | Stock Option (right to buy) | A | 150,000 | $0.00 | 150,000 | D | A |
| 15 Feb, 2026 | Thomas Desrosier | Common Stock | A | 244 | - | 7,867 | D | M |
| 15 Feb, 2026 | Teresa L. Young | Common Stock | A | 231 | - | 8,632 | D | M |
| 15 Feb, 2026 | Teresa L. Young | Common Stock | A | 231 | - | 8,632 | D | M |
| 15 Feb, 2026 | Teresa L. Young | Common Stock | A | 231 | - | 8,632 | D | M |
| 15 Feb, 2026 | Eric D. Shaff | Common Stock | A | 723 | - | 11,836 | D | M |
| 15 Feb, 2026 | Matthew R Henn | Common Stock | A | 239 | - | 7,766 | D | M |
| 15 Feb, 2026 | Teresa L. Young | Common Stock | D | 75 | $8.47 | 8,557 | D | S |
| 15 Feb, 2026 | Teresa L. Young | Common Stock | D | 75 | $8.47 | 8,557 | D | S |
| 15 Feb, 2026 | Thomas Desrosier | Common Stock | D | 78 | $8.47 | 7,789 | D | S |
| 15 Feb, 2026 | Eric D. Shaff | Common Stock | D | 259 | $8.47 | 11,577 | D | S |
| 15 Feb, 2026 | Matthew R Henn | Common Stock | D | 89 | $8.47 | 7,677 | D | S |
| 15 Feb, 2026 | Teresa L. Young | Common Stock | D | 75 | $8.47 | 8,557 | D | S |
| 15 Feb, 2026 | Teresa L. Young | Restricted Stock Units | D | 133 | $0.00 | 531 | D | M |
| 15 Feb, 2026 | Teresa L. Young | Restricted Stock Units | D | 133 | $0.00 | 531 | D | M |
| 15 Feb, 2026 | Thomas Desrosier | Restricted Stock Units | D | 133 | $0.00 | 531 | D | M |
| 15 Feb, 2026 | Teresa L. Young | Restricted Stock Units | D | 133 | $0.00 | 531 | D | M |