Seres Therapeutics Inc (MCRB)
Healthcare
Biotechnology
4.80 $
+1.0%
vs. previous close
Closing price · As of: 31. Jul 2026
Who owns Seres Therapeutics Inc (MCRB)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 87.5% of the shares are freely tradable; institutional investors hold 24.4%.
Ownership Structure
Institutional ownership
Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings.
24.4%
Insiders
Share of the stock held by the executives, founders and major shareholders of the company itself.
11.8%
Float
Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders.
87.5%
Short % of float
Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices.
3.0%
Shares Outstanding
Total number of shares issued. Price times share count gives market cap.
10Mio.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Flagship Ventures Management, Inc. | 11.94 | 1,155,850 | +0.0 | 03/31/2026 |
| Vanguard Group Inc | 3.35 | 324,214 | +4.0 | 12/31/2025 |
| Vanguard Capital Management, LLC | 3.04 | 294,143 | +0.0 | 03/31/2026 |
| Marshall Wace Asset Management Ltd | 1.44 | 139,539 | +16.1 | 03/31/2026 |
| Vontobel Holding Ltd. | 1.43 | 138,468 | +34.1 | 03/31/2026 |
| Susquehanna International Group, LLP | 1.09 | 105,339 | -41.5 | 03/31/2026 |
| BlackRock Inc | 1.05 | 102,026 | -1.5 | 03/31/2026 |
| Geode Capital Management, LLC | 0.77 | 74,835 | -13.1 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard Total Stock Mkt Idx Inv | 2.13 | 206,170 | +0.0 | 04/30/2026 |
| Vanguard Institutional Extnd Mkt Idx Tr | 0.79 | 76,119 | +8.8 | 04/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.