Who Owns SERES THERAPEUTICS INC (MCRB)? -- Institutional Holders (2026-06-30)
40 institutions reported holding $19.5M of SERES THERAPEUTICS INC (MCRB) in SEC 13F filings for 2026-06-30. Largest institutional holders: Flagship Pioneering Inc. ($9.1M), VANGUARD GROUP INC ($2.7M), MARSHALL WACE, LLP ($1.4M), SUSQUEHANNA INTERNATIONAL GROUP, LLP ($1.1M), Vontobel Holding Ltd. ($970,273). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|
| 1 | Flagship Pioneering Inc. | $9.1M | 1.2M | Hold |
| 2 | VANGUARD GROUP INC | $2.7M | 338,436 | Added |
| 3 | MARSHALL WACE, LLP | $1.4M | 172,245 | Added |
| 4 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $1.1M | 133,228 | Trimmed |
| 5 | Vontobel Holding Ltd. | $970,273 | 122,975 | Trimmed |
| 6 | BlackRock, Inc. | $875,790 | 111,000 | Added |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | $631,301 | 79,974 | Added |
| 8 | CITADEL ADVISORS LLC | $426,092 | 54,004 | Trimmed |
| 9 | STATE STREET CORP | $267,479 | 33,901 | Hold |
| 10 | Lion Point Capital, LP | $249,087 | 31,570 | Hold |
| 11 | GROUP ONE TRADING LLC | $245,489 | 31,114 | Trimmed |
| 12 | Sixth Street Partners Management Company, L.P. | $244,977 | 31,049 | New |
| 13 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $244,977 | 31,049 | Trimmed |
| 14 | AMERICAN CENTURY COMPANIES INC | $223,390 | 28,313 | Trimmed |
| 15 | SIMPLEX TRADING, LLC | $221,692 | 28,098 | Added |
| 16 | XTX Topco Ltd | $163,575 | 20,732 | New |
| 17 | GOLDMAN SACHS GROUP INC | $120,157 | 15,229 | New |
| 18 | NORTHERN TRUST CORP | $116,496 | 14,765 | Hold |
| 19 | Invesco Ltd. | $102,365 | 12,974 | Trimmed |
| 20 | MORGAN STANLEY | $95,769 | 12,138 | Trimmed |
| 21 | SBI Securities Co., Ltd. | $32,996 | 4,182 | Added |
| 22 | Integrated Wealth Concepts LLC | $31,560 | 4,000 | New |
| 23 | JPMORGAN CHASE & CO | $28,325 | 3,636 | New |
| 24 | FMR LLC | $12,056 | 1,528 | Trimmed |
| 25 | Rachor Investment Advisory Services, LLC | $11,654 | 1,477 | Hold |
Source: SEC Form 13F filings · as of 2026-06-30