MCRB — Seres Therapeutics, Inc.
Price · 2024-08-26 → 2026-08-21
499 daily closes shownAnonymous view is capped at two years of history. A free account extends it to five, and Pro opens the whole archive back to 2016-01-04.
Performance
Technicals
Others in Healthcare
Insider transactions (Form 4)
| date | insider | what | shares | price | value |
|---|---|---|---|---|---|
| 2026-08-17 | Shaff Eric D. Director | Open-market sale 10b5-1 plan | 263 | 4.55 | 1.2K |
| 2026-08-17 | DesRosier Thomas See Remarks | Open-market sale 10b5-1 plan | 82 | 4.55 | 373 |
| 2026-08-17 | Henn Matthew R See Remarks | Open-market sale 10b5-1 plan | 81 | 4.55 | 369 |
| 2026-08-17 | Brady Kelly See Remarks | Open-market sale 10b5-1 plan | 64 | 4.55 | 291 |
| 2026-08-15 | DesRosier Thomas See Remarks | Option exercise 10b5-1 plan | 245 | — | — |
| 2026-08-15 | Shaff Eric D. Director | Option exercise 10b5-1 plan | 722 | — | — |
| 2026-08-15 | Brady Kelly See Remarks | Option exercise 10b5-1 plan | 181 | — | — |
| 2026-08-15 | Henn Matthew R See Remarks | Option exercise 10b5-1 plan | 238 | — | — |
| 2026-05-18 | Shaff Eric D. Director | Open-market sale 10b5-1 plan | 259 | 7.53 | 2.0K |
| 2026-05-18 | DesRosier Thomas See Remarks | Open-market sale 10b5-1 plan | 79 | 7.53 | 595 |
Open-market purchases (code P) are the informative ones. Grants, option exercises and tax withholding are compensation mechanics, not decisions. How to read a Form 4 →
Largest institutional holders
| manager | value | shares |
|---|---|---|
| Flagship Pioneering, LLC | 10.3M | 1.2M |
| VANGUARD CAPITAL MANAGEMENT LLC | 2.6M | 294.1K |
| MARSHALL WACE, LLP | 1.2M | 139.5K |
| Vontobel Holding Ltd. | 1.2M | 138.5K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 934.4K | 105.3K |
| BlackRock, Inc. | 905.0K | 102.0K |
| GEODE CAPITAL MANAGEMENT, LLC | 664.1K | 74.8K |
| AMERICAN CENTURY COMPANIES INC | 552.7K | 62.3K |
| VANGUARD FIDUCIARY TRUST CO | 351.6K | 39.6K |
| STATE STREET CORP | 300.7K | 33.9K |
13F positions as of 2026-03-31, filed up to 45 days after quarter end. Long-only US equity — shorts and derivatives never appear. What 13F does and does not show →
Short selling
This is off-exchange short volume, not short interest: it is flow, not position, and 40–50% is normal because market makers short to fill your buy. Why that number misleads →
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