Seres TherapeuticsMCRB
13F holders, Q2 2025 (June 30)33holders +29
8new positions
4sold out
$11.11avg. 13F price*
At the end of Q2 2025, 33 institutions reported holding Seres Therapeutics Inc. (MCRB) in their 13F filings, up 29 from Q1 2025. 8 opened new positions and 4 sold out. The largest holders were Flagship Pioneering, LLC ($12.8M), Vanguard Group Inc. ($3.2M) and FMR LLC ($3.0M).
- Company
- Seres Therapeutics Inc.
- CUSIP
- 81750R201
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q1 2025 → Q2 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 8 | $1.5M |
| Exits | 4 | $53K |
All 13F filers, Q1 2025 → Q2 2025: 198,117 shares bought and 1,076,974 shares sold, net −878,857 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 33 holders
| Flagship Pioneering, LLC | 4.78% | No change | 1,155,850 | $12.8M |
| Vanguard Group Inc. | 0.00% | Reduce -4.1% | 292,096 | $3.2M |
| FMR LLC | 0.00% | Reduce -75.5% | 268,704 | $3.0M |
| BlackRock, Inc. | 0.00% | Add +15.0% | 101,351 | $1.1M |
| Geode Capital Management, LLC | 0.00% | Add +13.2% | 91,602 | $1.0M |
| Marshall Wace, LLP | 0.00% | New | 91,405 | $1.0M |
| Vontobel Holding Ltd. | 0.00% | Add +47.9% | 80,325 | $892K |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -16.4% | 34,876 | $387K |
| State Street Corp. | 0.00% | Add +7.2% | 26,831 | $298K |
| XTX Topco Ltd | 0.01% | New | 22,417 | $249K |
| Squarepoint Ops LLC | 0.00% | New | 20,908 | $232K |
| Lion Point Capital, LP | 1.29% | No change | 17,038 | $189K |
| Northern Trust Corp. | 0.00% | No change | 15,076 | $167K |
| Tang Capital Management LLC | 0.01% | Add +36.5% | 13,921 | $155K |
| Bridgeway Capital Management, LLC | 0.00% | No change | 12,500 | $139K |
| Susquehanna International Group, LLP | 0.00% | Reduce -67.4% | 11,684 | $130K |
| Morgan Stanley | 0.00% | Add +4.8% | 7,838 | $87K |
| UBS Group AG | 0.00% | Reduce -89.7% | 7,532 | $84K |
| Royal Bank of Canada | 0.00% | Add +3029.6% | 6,954 | $77K |
| SBI Securities Co., Ltd. | 0.00% | Reduce -95.0% | 3,482 | $39K |
| Group One Trading LLC | 0.00% | Add +2.3% | 1,161 | $13K |
| Atlantic Union Bankshares Corp | 0.00% | New | 411 | $5K |
| BNP Paribas Financial Markets | 0.00% | Reduce -0.6% | 305 | $3K |
| Bank of America Corp. | 0.00% | Reduce -37.5% | 186 | $2K |
| Tower Research Capital LLC (TRC) | 0.00% | New | 185 | $2K |
| Physician Wealth Advisors, Inc. | 0.00% | New | 142 | $2K |
| JPMorgan Chase & Co. | 0.00% | Reduce -0.3% | 65 | $722 |
| Raymond James Financial Inc. | 0.00% | New | 56 | $623 |
| US Bancorp \de | 0.00% | New | 25 | $278 |
| Wells Fargo & Company | 0.00% | Reduce -97.4% | 10 | $111 |
| Citigroup Inc. | 0.00% | Reduce -16.3% | 9 | $100 |
| Osaic Holdings, Inc. | 0.00% | No change | 8 | $88 |
| Whittier Trust Co. | 0.00% | Reduce -33.3% | 1 | $11 |
"% of holder's portfolio" is MCRB's weight in each manager's 13F, not the share of Seres Therapeutics Inc. the manager owns.