Seres Therapeutics, Inc.
MCRB- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001609809
In the last 90 days, Seres Therapeutics, Inc. insiders filed 0 open-market purchases and 4 sales; 35 institutions reported holding it in 13F filings for Q2 2026, worth $17.9M in total; no superinvestor holds it.
Open-market trades, last 90 days
Open-market purchases (P) and sales (S) by Seres Therapeutics, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.
- Open-market buys
- 0 filings
- Open-market sells
- 4 filings
- 4 insiders, $2.23K in total
- Insiders trading
- 4
- Net value
- −$2.23K
- Purchases minus sales
Insider roster
Directors, officers and 10% owners who have filed a Form 4 for Seres Therapeutics, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.
| Name | Title | Last reported holding | Last filing | Filings, past year |
|---|---|---|---|---|
| Brady Kelly | See Remarks | 8,679 | Aug 18, 2026 | 4 |
| Shaff Eric D. | Director | 12,499 | Aug 18, 2026 | 5 |
| Henn Matthew R. | See Remarks | 7,995 | Aug 18, 2026 | 7 |
| DesRosier Thomas | See Remarks | 8,117 | Aug 18, 2026 | 6 |
| Graves Kurt | Director | – | Jul 10, 2026 | 1 |
| Kender Richard N | See Remarks | 63,492 | Jul 10, 2026 | 2 |
| Thorell Marella | See Remarks | – | Jul 10, 2026 | 2 |
| Fraser Claire | Director | – | Jul 10, 2026 | 1 |
| Dere Willard H | Director | 31,746 | Jul 10, 2026 | 1 |
| Ausiello Dennis A | Director | – | Jul 10, 2026 | 2 |
| Rosiello Robert L. | Director | – | Jul 10, 2026 | 2 |
| Berenson Stephen | Director | – | Jul 10, 2026 | 2 |
| Young Teresa L. | See Remarks | 8,557 | Feb 18, 2026 | 3 |
| Biondi Paul | Director | 47,619 | Apr 11, 2025 | 0 |
| von Moltke Lisa | See Remarks | 39,875 | Feb 19, 2025 | 0 |
| Woerle Hans-Juergen | Director | – | Feb 6, 2025 | 0 |
| Ege David S. | See Remarks | 77,575 | Aug 19, 2024 | 0 |
| Arkowitz David | Chief Financial Officer | 182,442 | Feb 16, 2024 | 0 |
| Cloghessy Paula | See Remarks | 45,684 | Oct 31, 2023 | 0 |
| Behar Gregory | Director | – | Jun 23, 2023 | 0 |
| Afeyan Noubar | 10% Owner | 5,825,495Indirect | Jul 7, 2022 | 0 |
| Flagship Pioneering, LLC | 10% Owner | 5,825,495Indirect | Jul 7, 2022 | 0 |
| Nutritional Health LTP Fund General Partner LLC | 10% Owner | 5,825,495Indirect | Jul 7, 2022 | 0 |
| Nutritional Health LTP Fund, L.P. | 10% Owner | 5,825,495Indirect | Jul 7, 2022 | 0 |
| Zausner Meryl | Director | 31,746 | Jul 6, 2022 | 0 |
Insider trades
Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Aug 19, 2025 (view filing) | Aug 18 | 1 day | Henn Matthew R.See Remarks | SSale | −73 | $16.65 | −$1.22K | −1.6%4.55K after | 10b5-1 |
| Aug 19, 2025 (view filing) | Aug 18 | 1 day | Shaff Eric D.Director | SSale | −217 | $16.65 | −$3.61K | −2.0%10.6K after | 10b5-1 |
| Aug 19, 2025 (view filing) | Aug 18 | 1 day | Young Teresa L.See Remarks | SSale | −59 | $16.65 | −$982.35 | −1.1%5.21K after | 10b5-1 |
| Aug 19, 2025 (view filing) | Aug 18 | 1 day | DesRosier ThomasSee Remarks | SSale | −76 | $16.65 | −$1.27K | −1.0%7.46K after | 10b5-1 |
| Nov 18, 2025 (view filing) | Nov 15 | 3 days | Henn Matthew R.See Remarks | SSale | −1.26K | $17.30 | −$21.7K | −14.3%7.53K after | 10b5-1 |
| Nov 18, 2025 (view filing) | Nov 15 | 3 days | Shaff Eric D.Director | SSale | −217 | $17.30 | −$3.75K | −1.9%11.1K after | 10b5-1 |
| Nov 18, 2025 (view filing) | Nov 15 | 3 days | Young Teresa L.See Remarks | SSale | −1.04K | $17.30 | −$18.0K | −11.0%8.40K after | 10b5-1 |
| Nov 18, 2025 (view filing) | Nov 15 | 3 days | DesRosier ThomasSee Remarks | SSale | −76 | $17.30 | −$1.31K | −1.0%7.62K after | 10b5-1 |
| Feb 18, 2026 (view filing) | Feb 15 | 3 days | Henn Matthew R.See Remarks | SSale | −89 | $8.47 | −$753.83 | −1.1%7.68K after | 10b5-1 |
| Feb 18, 2026 (view filing) | Feb 15 | 3 days | DesRosier ThomasSee Remarks | SSale | −78 | $8.47 | −$660.66 | −1.0%7.79K after | 10b5-1 |
| Feb 18, 2026 (view filing) | Feb 15 | 3 days | Shaff Eric D.Director | SSale | −259 | $8.47 | −$2.19K | −2.2%11.6K after | 10b5-1 |
| Feb 18, 2026 (view filing) | Feb 15 | 3 days | Young Teresa L.See Remarks | SSale | −75 | $8.47 | −$635.25 | −0.9%8.56K after | 10b5-1 |
| May 19, 2026 (view filing) | May 18 | 1 day | Henn Matthew R.See Remarks | SSale | −77 | $7.53 | −$579.81 | −1.0%7.84K after | 10b5-1 |
| May 19, 2026 (view filing) | May 18 | 1 day | DesRosier ThomasSee Remarks | SSale | −79 | $7.53 | −$594.87 | −1.0%7.95K after | 10b5-1 |
| May 19, 2026 (view filing) | May 18 | 1 day | Brady KellySee Remarks | SSale | −59 | $7.53 | −$444.27 | −0.7%8.56K after | |
| May 19, 2026 (view filing) | May 18 | 1 day | Shaff Eric D.Director | SSale | −259 | $7.53 | −$1.95K | −2.1%12.0K after | 10b5-1 |
| Aug 18, 2026 (view filing)5:22 PM ET | Aug 17 | 1 day | DesRosier ThomasSee Remarks | SSale | −82 | $4.55 | −$373.1 | −1.0%8.12K after | 10b5-1 |
| Aug 18, 2026 (view filing)5:25 PM ET | Aug 17 | 1 day | Henn Matthew R.See Remarks | SSale | −81 | $4.55 | −$368.55 | −1.0%8.00K after | 10b5-1 |
| Aug 18, 2026 (view filing)5:27 PM ET | Aug 17 | 1 day | Shaff Eric D.Director | SSale | −263 | $4.55 | −$1.20K | −2.1%12.5K after | 10b5-1 |
| Aug 18, 2026 (view filing)5:33 PM ET | Aug 17 | 1 day | Brady KellySee Remarks | SSale | −64 | $4.55 | −$291.2 | −0.7%8.68K after | 10b5-1 |