MCRB Seres Therapeutics, Inc.
Seres Therapeutics, Inc. (MCRB) Institutional Ownership
What the institutions did with MCRB last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
Sign in or subscribeLargest holders
| Manager | Shares | % of reported |
|---|---|---|
| Flagship Pioneering, LLC | 1.2M | 50.8% |
| VANGUARD CAPITAL MANAGEMENT LLC | 287.8K | 12.7% |
| MARSHALL WACE, LLP | 172.2K | 7.6% |
| Vontobel Holding Ltd. | 123.0K | 5.4% |
| BlackRock, Inc. | 111.0K | 4.9% |
| GEODE CAPITAL MANAGEMENT, LLC | 80.0K | 3.5% |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 58.3K | 2.6% |
| VANGUARD FIDUCIARY TRUST CO | 48.7K | 2.1% |
| STATE STREET CORP | 33.9K | 1.5% |
| Lion Point Capital, LP | 31.6K | 1.4% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 31.0K | 1.4% |
| AMERICAN CENTURY COMPANIES INC | 28.3K | 1.2% |
| XTX Topco Ltd | 20.7K | 0.9% |
| GOLDMAN SACHS GROUP INC | 15.2K | 0.7% |
| NORTHERN TRUST CORP | 14.8K | 0.6% |
| Invesco Ltd. | 13.0K | 0.6% |
| MORGAN STANLEY | 12.1K | 0.5% |
| CITADEL ADVISORS LLC | 10.5K | 0.5% |
| SIMPLEX TRADING, LLC | 4.6K | 0.2% |
| SBI Securities Co., Ltd. | 4.2K | 0.2% |
| Integrated Wealth Concepts LLC | 4.0K | 0.2% |
| GROUP ONE TRADING LLC | 3.7K | 0.2% |
| JPMORGAN CHASE & CO | 3.6K | 0.2% |
| Vanguard Global Advisers, LLC | 2.0K | 0.1% |
| FMR LLC | 1.5K | 0.1% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | 105.3K | 58.3K | -47.0K |
| AMERICAN CENTURY COMPANIES INC | Reduced | 62.3K | 28.3K | -34.0K |
| MARSHALL WACE, LLP | Increased | 139.5K | 172.2K | +32.7K |
| XTX Topco Ltd | New | 0 | 20.7K | +20.7K |
| TWO SIGMA INVESTMENTS, LP | Sold Out | 18.8K | 0 | -18.8K |
| Vontobel Holding Ltd. | Reduced | 138.5K | 123.0K | -15.5K |
| GOLDMAN SACHS GROUP INC | New | 0 | 15.2K | +15.2K |
| CITADEL ADVISORS LLC | New | 0 | 10.5K | +10.5K |
| MORGAN STANLEY | Reduced | 21.7K | 12.1K | -9.6K |
| VANGUARD FIDUCIARY TRUST CO | Increased | 39.6K | 48.7K | +9.0K |
| BlackRock, Inc. | Increased | 102.0K | 111.0K | +9.0K |
| UBS Group AG | Reduced | 7.0K | 484 | -6.5K |
| VANGUARD CAPITAL MANAGEMENT LLC | Reduced | 294.1K | 287.8K | -6.4K |
| BARCLAYS PLC | Reduced | 6.5K | 167 | -6.3K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 74.8K | 80.0K | +5.1K |
| Integrated Wealth Concepts LLC | New | 0 | 4.0K | +4.0K |
| JPMORGAN CHASE & CO | New | 0 | 3.6K | +3.6K |
| GROUP ONE TRADING LLC | Increased | 824 | 3.7K | +2.9K |
| Invesco Ltd. | Reduced | 14.5K | 13.0K | -1.6K |
| SIMPLEX TRADING, LLC | Increased | 3.1K | 4.6K | +1.5K |
| SBI Securities Co., Ltd. | Increased | 3.5K | 4.2K | +700 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | Reduced | 31.6K | 31.0K | -581 |
| Tower Research Capital LLC (TRC) | Reduced | 794 | 316 | -478 |
| FMR LLC | Reduced | 1.8K | 1.5K | -224 |
| Physician Wealth Advisors, Inc. | Sold Out | 142 | 0 | -142 |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.