Seres Therapeutics, Inc.
MCRB- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001609809
In the last 90 days, Seres Therapeutics, Inc. insiders filed 0 open-market purchases and 4 sales; 35 institutions reported holding it in 13F filings for Q2 2026, worth $17.9M in total; no superinvestor holds it.
13F holders, Q2 2026
Institutional positions in Seres Therapeutics, Inc. as of Jun 30, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 35
- +2 vs. Q1 2026
- Shares held
- 2.27M
- −36.1K (−1.6%) vs. Q1 2026
- Total value
- $17.9M
- −$2.55M (−12.4%) vs. Q1 2026
- New holders
- 7
- 7 more added
- Sold out
- 5
- 12 more reduced
Compare with Q1 2026: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting MCRB on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 35 | $17.9M |
| Q1 2026 | 33 | $20.5M |
| Q4 2025 | 36 | $36.4M |
| Q3 2025 | 32 | $40.9M |
| Q2 2025 | 33 | $25.5M |
| Q1 2025 | 63 | $43.1M |
| Q4 2024 | 69 | $52.5M |
| Q3 2024 | 77 | $60.1M |
| Q2 2024 | 93 | $50.0M |
| Q1 2024 | 99 | $67.6M |
| Q4 2023 | 103 | $127.2M |
| Q3 2023 | 134 | $260.3M |
| Q2 2023 | 138 | $538.1M |
| Q1 2023 | 123 | $702.9M |
| Q4 2022 | 124 | $588.2M |
| Q3 2022 | 120 | $743.3M |
| Q2 2022 | 123 | $312.7M |
| Q1 2022 | 131 | $537.2M |
| Q4 2021 | 148 | $650.3M |
| Q3 2021 | 133 | $555.1M |
| Q2 2021 | 147 | $1.93B |
| Q1 2021 | 154 | $1.85B |
Institutions, Q2 2026
Shares, value and share of portfolio for each institution holding Seres Therapeutics, Inc.; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Flagship Pioneering Inc. | 1,155,850 | $9.12M | 0.59% | 00.0% | Unchanged |
| Vanguard Capital Management LLC | 287,776 | $2.27M | 0.00% | −6,367−2.2% | Reduced |
| Marshall Wace, LLP | 172,245 | $1.36M | 0.00% | +32,706+23.4% | Added |
| Vontobel Holding Ltd. | 122,975 | $970.3K | 0.00% | −15,493−11.2% | Reduced |
| BlackRock, Inc. | 111,000 | $875.8K | 0.00% | +8,974+8.8% | Added |
| Geode Capital Management, LLC | 79,974 | $631.3K | 0.00% | +5,139+6.9% | Added |
| Susquehanna International Group, LLP | 58,328 | $460.2K | 0.00% | −47,011−44.6% | Reduced |
| Vanguard Fiduciary Trust Co | 48,685 | $384.1K | 0.00% | +9,042+22.8% | Added |
| State Street Corp | 33,901 | $267.5K | 0.00% | 00.0% | Unchanged |
| Lion Point Capital, LP | 31,570 | $249.1K | 1.19% | 00.0% | Unchanged |
| Charles Schwab Investment Management Inc | 31,049 | $245.0K | 0.00% | −581−1.8% | Reduced |
| American Century Companies Inc | 28,313 | $223.4K | 0.00% | −34,003−54.6% | Reduced |
| XTX Topco Ltd | 20,732 | $163.6K | 0.00% | +20,732 | New |
| Goldman Sachs Group Inc | 15,229 | $120.2K | 0.00% | +15,229 | New |
| Northern Trust Corp | 14,765 | $116.5K | 0.00% | 00.0% | Unchanged |
| Invesco Ltd. | 12,974 | $102.4K | 0.00% | −1,573−10.8% | Reduced |
| Morgan Stanley | 12,138 | $95.8K | 0.00% | −9,562−44.1% | Reduced |
| Citadel Advisors LLC | 10,504 | $82.9K | 0.00% | +10,504 | New |
| Simplex Trading, LLC | 4,598 | $36.3K | 0.00% | +1,528+49.8% | Added |
| SBI Securities Co., Ltd. | 4,182 | $33.0K | 0.00% | +700+20.1% | Added |
| Group One Trading, L.P. | 3,714 | $29.3K | 0.00% | +2,890+350.7% | Added |
| JPMorgan Chase & Co | 3,636 | $28.3K | 0.00% | +3,636 | New |
| Vanguard Global Advisers, LLC | 1,975 | $15.6K | 0.00% | 00.0% | Unchanged |
| FMR LLC | 1,528 | $12.1K | 0.00% | −224−12.8% | Reduced |
| Rachor Investment Advisory Services, LLC | 1,477 | $11.7K | 0.01% | 00.0% | Unchanged |
| UBS Group AG | 484 | $3.82K | 0.00% | −6,546−93.1% | Reduced |
| Tower Research Capital LLC (TRC) | 316 | $2.49K | 0.00% | −478−60.2% | Reduced |
| BNP Paribas Arbitrage, SA | 211 | $1.67K | 0.00% | 00.0% | Unchanged |
| Barclays PLC | 167 | $1.32K | 0.00% | −6,340−97.4% | Reduced |
| Continuum Advisory, LLC | 47 | $371 | 0.00% | +47 | New |
| Wells Fargo & Company | 10 | $79 | 0.00% | 00.0% | Unchanged |
| Advisor Group Holdings, Inc. | 8 | $63 | 0.00% | 00.0% | Unchanged |
| Larson Financial Group LLC | 5 | $39 | 0.00% | +5 | New |
| Whittier Trust Co of Nevada Inc | 1 | $8 | 0.00% | +1 | New |
| Royal Bank of Canada | 11 | $0 | 0.00% | −96−89.7% | Reduced |
| Two Sigma Investments, LP | 0 | $0 | 0.00% | −18,794−100.0% | Sold out |
| UMA Financial Services, Inc. | 0 | $0 | 0.00% | −142−100.0% | Sold out |
| Sound Income Strategies, LLC | 0 | $0 | 0.00% | −8−100.0% | Sold out |
| Allworth Financial LP | 0 | $0 | 0.00% | −4−100.0% | Sold out |
| SRS Capital Advisors, Inc. | 0 | $0 | 0.00% | −6−100.0% | Sold out |