Seres Therapeutics Ownership | Who Owns Seres Therapeutics?
Seres Therapeutics Ownership Summary
Seres Therapeutics is owned by 3.81% institutional investors, 12.44% insiders, and 83.75% retail investors. Flagship pioneering is the largest institutional shareholder, holding 13.22% of MCRB shares. Fidelity Growth Compy Commingled Pl O is the top mutual fund, with 5.55% of its assets in Seres Therapeutics shares.
MCRB Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Seres Therapeutics | 3.81% | 12.44% | 83.75% |
| Sector | Healthcare Stocks | 232.01% | 10.74% | -142.75% |
| Industry | Biotech Stocks | 381.47% | 10.55% | -292.02% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Flagship pioneering | 1.16M | 13.22% | $22.24M |
| Vanguard group | 324.21K | 3.70% | $4.82M |
| Marshall wace, llp | 125.60K | 1.44% | $2.42M |
| Blackrock | 1.76M | 1.21% | $1.28M |
| Blackrock funding, inc. /de | 103.62K | 1.18% | $1.54M |
| Vontobel | 103.23K | 1.18% | $1.54M |
| Geode capital management | 86.14K | 0.98% | $1.28M |
| Charles schwab investment management | 31.40K | 0.36% | $604.19K |
| State street | 29.73K | 0.34% | $572.02K |
| Schonfeld strategic advisors | 28.94K | 0.33% | $556.84K |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Flagship pioneering | 1.16M | 7.60% | $22.24M |
| Lion point capital, lp | 27.14K | 2.97% | $522.13K |
| J. goldman & co lp | 27.00K | 0.01% | $519.48K |
| Vontobel | 103.23K | 0.00% | $1.54M |
| Schonfeld strategic advisors | 28.94K | 0.00% | $556.84K |
| Marshall wace, llp | 125.60K | 0.00% | $2.42M |
| Sbi securities | 3.48K | 0.00% | $51.81K |
| Physician wealth advisors | 142.00 | 0.00% | $2.11K |
| Charles schwab investment management | 31.40K | 0.00% | $604.19K |
| Geode capital management | 86.14K | 0.00% | $1.28M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Marshall wace, llp | 125.60K | 0.00% | 34.20K |
| Schonfeld strategic advisors | 28.94K | 0.00% | 28.94K |
| J. goldman & co lp | 27.00K | 0.01% | 27.00K |
| Goldman sachs group | 14.34K | - | 14.34K |
| Vanguard group | 324.21K | 0.00% | 12.32K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Blackrock | 1.76M | - | -5.06M |
| Woodline partners lp | - | - | -2.05M |
| Millennium management | 29.55K | - | -1.78M |
| Bank of america corp /de/ | 105.04K | - | -1.55M |
| Handelsbanken fonder ab | - | - | -1.10M |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Schonfeld strategic advisors | 28.94K | 0.00% | 28.94K | $556.84K |
| J. goldman & co lp | 27.00K | 0.01% | 27.00K | $519.48K |
| Goldman sachs group | 14.34K | - | 14.34K | $213.38K |
| Invesco | 10.44K | - | 10.44K | $200.90K |
| Macquarie group | 4.95K | - | 4.95K | $3.58K |
Sold Out
| Holder | Change |
|---|---|
| Whittier trust | -1.00 |
| Federation des caisses desjardins du quebec | -3.00 |
| Headlands | -10.00 |
| Us bancorp \de\ | -12.00 |
| Point72 (difc) | -17.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Dec 31, 2025 | 7 | -84.09% | 333,553 | -84.31% | 3 | 0.64% | 3 | -88.46% | 1 | -85.71% |
| Sep 30, 2025 | 10 | -71.43% | 448,121 | -80.32% | 5 | 0.76% | 5 | -54.55% | 1 | -95.45% |
| Jun 30, 2025 | 36 | -44.62% | 2,284,946 | -96.28% | 26 | 2.10% | 13 | -35.00% | 21 | 16.67% |
| Mar 31, 2025 | 3 | -96.00% | 23,487,356 | -62.76% | 13 | 0.79% | - | -100.00% | 1 | -94.44% |
| Dec 31, 2024 | 70 | -13.58% | 62,481,139 | -1.44% | 40 | 2.37% | 25 | -3.85% | 17 | -34.62% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| Fidelity Growth Compy Commingled Pl O | 9.44M | 5.55% | 92.60K |
| Vanguard US Total Market Shares ETF | 4.04M | 2.32% | - |
| Vanguard Total Stock Mkt Idx Inv | 206.17K | 2.28% | - |
| Fidelity Growth Compy Commingled Pl S | 108.78K | 1.25% | -73.89K |
| Vanguard Institutional Extnd Mkt Idx Tr | 69.95K | 0.77% | - |
| Vanguard Explorer Inv | 1.22M | 0.72% | - |
| Avantis US Small Cap Value ETF | 56.03K | 0.62% | - |
| Fidelity Select Biotechnology | 854.35K | 0.50% | - |
| Fidelity Series Growth Company | 38.18K | 0.44% | -22.70K |
| LUX IM Global Medtech HX | 38.13K | 0.42% | 38.13K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Feb 15, 2026 | Shaff Eric D. | - | Sell | $2.19K |
| Feb 15, 2026 | Young Teresa L. | See Remarks | Sell | $635.25 |
| Feb 15, 2026 | DesRosier Thomas | See Remarks | Sell | $660.66 |
| Feb 15, 2026 | Henn Matthew R | See Remarks | Sell | $753.83 |
| Nov 15, 2025 | Young Teresa L. | See Remarks | Sell | $18.03K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q1 | - | 4 |
| 2025 Q4 | - | 4 |
| 2025 Q3 | - | 4 |
| 2025 Q2 | - | 4 |
| 2025 Q1 | - | 5 |
MCRB Ownership FAQ
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