| $350M | ||
| $217M | ||
| $172M | ||
| $109M | ||
| $107M | ||
| $104M |
Buys | $0 | 0 | 0 |
Sells | $54,884 | 16 | 100 |
| Brady Kelly | See Remarks | 0 | $0 | 2 | $735 | $-735 |
| DesRosier Thomas | See Remarks | 0 | $0 | 4 | $2,943 | $-2,943 |
| Shaff Eric D. | director | 0 | $0 | 4 | $9,095 | $-9,095 |
| Young Teresa L. | See Remarks | 0 | $0 | 2 | $18,662 | $-18,662 |
| Henn Matthew R | See Remarks | 0 | $0 | 4 | $23,448 | $-23,448 |
Seres Therapeutics, Inc. is a pioneering microbiome therapeutics firm dedicated to engineering bacterial consortia that modulate host cells and tissues to combat various diseases. Their flagship therapeutic, SER-109, an oral microbiome treatment, has successfully concluded Phase III clinical trials for the management of Clostridioides difficile infection (CDI). The company's pipeline further encompasses SER-155, a synthetically cultured bacterial formulation currently undergoing Phase Ib evaluation. This candidate aims to mitigate the risk of …
Over the last 12 months, insiders at Seres Therapeutics, Inc. have bought $0 and sold $54,884 worth of Seres Therapeutics, Inc. stock.
On average, over the past 5 years, insiders at Seres Therapeutics, Inc. have bought $9.18M and sold $62,000 worth of stock each year.
There was no buying activity among insiders over the last 12 months.
The last purchase of 2,912,748 shares for transaction amount of $9.18M was made by AFEYAN NOUBAR () on 2022‑07‑05.
| 2026-08-17 | Sale | Shaff Eric D. | director | 263 0.0028% | $4.55 | $1,197 | -21.95% | |
| 2026-08-17 | Sale | Brady Kelly | See Remarks | 64 0.0007% | $4.55 | $291 | -21.95% | |
| 2026-08-17 | Sale | DesRosier Thomas | See Remarks | 82 0.0009% | $4.55 | $373 | -21.95% | |
| 2026-08-17 | Sale | Henn Matthew R | See Remarks | 81 0.0008% | $4.55 | $369 | -21.95% | |
| 2026-05-18 | Sale | Shaff Eric D. | director | 259 0.0027% | $7.53 | $1,950 | -34.12% | |
| 2026-05-18 | Sale | Brady Kelly | See Remarks | 59 0.0006% | $7.53 | $444 | -34.12% | |
| 2026-05-18 | Sale | DesRosier Thomas | See Remarks | 79 0.0008% | $7.53 | $595 | -34.12% | |
| 2026-05-18 | Sale | Henn Matthew R | See Remarks | 77 0.0008% | $7.53 | $580 | -34.12% | |
| 2026-02-15 | Sale | Shaff Eric D. | director | 259 0.0029% | $8.47 | $2,194 | -20.29% | |
| 2026-02-15 | Sale | Young Teresa L. | See Remarks | 75 0.0008% | $8.47 | $635 | -20.29% | |
| 2026-02-15 | Sale | DesRosier Thomas | See Remarks | 78 0.0009% | $8.47 | $661 | -20.29% | |
| 2026-02-15 | Sale | Henn Matthew R | See Remarks | 89 0.001% | $8.47 | $754 | -20.29% | |
| 2025-11-15 | Sale | Shaff Eric D. | director | 217 0.0026% | $17.30 | $3,754 | -64.28% | |
| 2025-11-15 | Sale | Young Teresa L. | See Remarks | 1,042 0.0123% | $17.30 | $18,027 | -64.28% | |
| 2025-11-15 | Sale | DesRosier Thomas | See Remarks | 76 0.0009% | $17.30 | $1,315 | -64.28% | |
| 2025-11-15 | Sale | Henn Matthew R | See Remarks | 1,257 0.0149% | $17.30 | $21,746 | -64.28% | |
| 2025-08-18 | Sale | Shaff Eric D. | director | 217 0.0023% | $16.65 | $3,613 | -47.31% | |
| 2025-08-18 | Sale | DesRosier Thomas | See Remarks | 76 0.0008% | $16.65 | $1,265 | -47.31% | |
| 2025-08-18 | Sale | Young Teresa L. | See Remarks | 59 0.0006% | $16.65 | $982 | -47.31% | |
| 2025-08-18 | Sale | Henn Matthew R | See Remarks | 73 0.0008% | $16.65 | $1,215 | -47.31% |
| AFEYAN NOUBAR | 5875711 59.1043% | $11.52M | 2 | 1 | +40% |
$931,435 | 28 | 16.31% | $24.8M | |
$226,127 | 22 | -27.62% | $21.96M | |
$114,619,342 | 20 | -7.41% | $16.39M | |
$352,389 | 18 | 9.66% | $17.82M | |
$742,412 | 14 | -50.36% | $17.71M |
| Increased Positions | 23 | +69.7% | 366,489 | +17.22% |
| Decreased Positions | 13 | -39.39% | 53,025 | -2.49% |
| New Positions | 9 | New | 317,221 | New |
| Sold Out Positions | 6 | Sold Out | 31,960 | Sold Out |
| Total Postitions | 43 | +30.3% | 2M | +14.73% |
| Flagship Pioneering Inc. | $17,511.00 | 12.84% | 1.16M | 0 | 0% | 2025-09-30 |
| Vanguard Group Inc | $4,725.00 | 3.47% | 311,889 | +19,793 | +6.78% | 2025-09-30 |
| Marshall Wace, Llp | $1,903.00 | 1.4% | 125,600 | +34,195 | +37.41% | 2025-09-30 |
| Blackrock, Inc. | $1,546.00 | 1.13% | 102,060 | +709 | +0.7% | 2025-09-30 |
| Vontobel Holding Ltd. | $1,492.00 | 1.1% | 98,511 | +18,186 | +22.64% | 2025-09-30 |
| Geode Capital Management, Llc | $1,287.00 | 0.94% | 84,982 | -6,620 | -7.23% | 2025-09-30 |
| Charles Schwab Investment Management Inc | $476.00 | 0.35% | 31,403 | -3,473 | -9.96% | 2025-09-30 |
| Citadel Advisors Llc | $468.00 | 0.34% | 30,885 | +30,885 | New | 2025-09-30 |
| State Street Corp | $450.00 | 0.33% | 29,731 | +2,900 | +10.81% | 2025-09-30 |
| Schonfeld Strategic Advisors Llc | $438.00 | 0.32% | 28,942 | +28,942 | New | 2025-09-30 |