# SERES THERAPEUTICS INC (MCRB)

> Institutional ownership reported to the SEC as of Q2 2026, from Form 13F filings. Source: https://holderbook.com/stocks/MCRB/

- Reporting holders: 38
- Reported value: $20.2M
- Shares held by institutions: 2,349,869 of 9,941,261 outstanding
- Held through calls: 1.4%
- Held through puts: 6.9%

A 13F reports long US equity positions only. Shorts, bonds, foreign listings and cash are not visible here, and positions are disclosed up to 45 days after the quarter ends.

## Largest holders

| Manager | Value | Shares | Share of their book | Quarters held |
|---|---|---|---|---|
| [Flagship Pioneering, LLC](https://holderbook.com/funds/1400240-flagship-pioneering-llc/) | $9.1M | 1,155,850 | 0.6% | 5 |
| [VANGUARD CAPITAL MANAGEMENT LLC](https://holderbook.com/funds/2100119-vanguard-capital-management-llc/) | $2.3M | 287,776 | 0.0% | 2 |
| [MARSHALL WACE, LLP](https://holderbook.com/funds/1318757-marshall-wace-llp/) | $1.4M | 172,245 | 0.0% | 5 |
| [SUSQUEHANNA INTERNATIONAL GROUP, LLP](https://holderbook.com/funds/1446194-susquehanna-international-group-llp/) | $1.1M | 58,328 | 0.0% | 5 |
| [Vontobel Holding Ltd.](https://holderbook.com/funds/1588340-vontobel-holding-ltd/) | $970.3K | 122,975 | 0.0% | 5 |
| [BlackRock, Inc.](https://holderbook.com/funds/2012383-blackrock-inc/) | $875.8K | 111,000 | 0.0% | 5 |
| [CITADEL ADVISORS LLC](https://holderbook.com/funds/1423053-citadel-advisors-llc/) | $852.2K | 21,008 | 0.0% | 5 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://holderbook.com/funds/1214717-geode-capital-management-llc/) | $631.3K | 79,974 | 0.0% | 5 |
| [STATE STREET CORP](https://holderbook.com/funds/93751-state-street-corp/) | $535.0K | 67,802 | 0.0% | 5 |
| [VANGUARD FIDUCIARY TRUST CO](https://holderbook.com/funds/933478-vanguard-fiduciary-trust-co/) | $384.1K | 48,685 | 0.0% | 2 |
| [Lion Point Capital, LP](https://holderbook.com/funds/1643354-lion-point-capital-lp/) | $249.1K | 31,570 | 1.2% | 5 |
| [GROUP ONE TRADING LLC](https://holderbook.com/funds/932540-group-one-trading-llc/) | $245.5K | 3,714 | 0.0% | 5 |
| [CHARLES SCHWAB INVESTMENT MANAGEMENT INC](https://holderbook.com/funds/884546-charles-schwab-investment-management-inc/) | $245.0K | 31,049 | 0.0% | 5 |
| [Sixth Street Partners Management Company, L.P.](https://holderbook.com/funds/1812095-sixth-street-partners-management-company-l-p/) | $245.0K | 31,049 | 0.0% | 1 |
| [AMERICAN CENTURY COMPANIES INC](https://holderbook.com/funds/748054-american-century-companies-inc/) | $223.4K | 28,313 | 0.0% | 3 |
| [SIMPLEX TRADING, LLC](https://holderbook.com/funds/1488542-simplex-trading-llc/) | $221.7K | 4,598 | 0.0% | 5 |
| [XTX Topco Ltd](https://holderbook.com/funds/1828301-xtx-topco-ltd/) | $163.6K | 20,732 | 0.0% | 1 |
| [GOLDMAN SACHS GROUP INC](https://holderbook.com/funds/886982-goldman-sachs-group-inc/) | $120.2K | 15,229 | 0.0% | 1 |
| [NORTHERN TRUST CORP](https://holderbook.com/funds/73124-northern-trust-corp/) | $116.5K | 14,765 | 0.0% | 5 |
| [Invesco Ltd.](https://holderbook.com/funds/914208-invesco-ltd/) | $102.4K | 12,974 | 0.0% | 4 |
| [MORGAN STANLEY](https://holderbook.com/funds/895421-morgan-stanley/) | $95.8K | 12,138 | 0.0% | 5 |
| [SBI Securities Co., Ltd.](https://holderbook.com/funds/1851815-sbi-securities-co-ltd/) | $33.0K | 4,182 | 0.0% | 6 |
| [Integrated Wealth Concepts LLC](https://holderbook.com/funds/1737109-integrated-wealth-concepts-llc/) | $31.6K | 4,000 | 0.0% | 1 |
| [JPMORGAN CHASE & CO](https://holderbook.com/funds/19617-jpmorgan-chase-co/) | $28.3K | 3,636 | 0.0% | 1 |
| [Vanguard Global Advisers, LLC](https://holderbook.com/funds/1811242-vanguard-global-advisers-llc/) | $15.6K | 1,975 | 0.0% | 2 |

## Quarter by quarter

| Quarter | Holders | Reported value |
|---|---|---|
| Q2 2026 | 38 | $20.2M |
| Q1 2026 | 34 | $22.8M |
| Q4 2025 | 39 | $45.4M |
| Q3 2025 | 41 | $60.9M |
| Q2 2025 | 36 | $27.9M |
| Q1 2025 | 65 | $43.2M |
| Q4 2024 | 70 | $55.5M |
| Q3 2024 | 77 | $61.9M |
| Q2 2024 | 93 | $50.8M |
| Q1 2024 | 98 | $68.4M |
| Q4 2023 | 103 | $127.7M |
| Q3 2023 | 136 | $268.1M |