Seres Therapeutics, Inc.: which funds bought and sold
Institutions that bought and sold Seres Therapeutics shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.
Between March 31, 2026 and June 30, 2026, 15 institutions that filed 13F reports for both quarters added to or opened positions in Seres Therapeutics, and 17 cut or closed them. Together they sold a net 32K shares, −1.4% on what they held at the start of the quarter. Active managers and hedge funds on our list were net sellers of 9,811 shares (−4.4%); index fund managers were net buyers of 16K shares (+2.7%). 8 opened a new position and 6 sold out entirely.
Bought, Q2 2026 15 institutions, 8 of them new holders Sold, Q2 2026 17 institutions, 6 of them sold out
Net change, all compared −32K shares (−1.4%)
Net change, active managers −9,811 shares (−4.4%), 2 bought, 3 sold
Buyers versus sellers
15 bought 9 17 sold
Active managers and hedge funds 2 bought · 3 sold · −9,811
Index fund managers 3 bought · 2 sold · +16K
Other institutions 10 bought · 12 sold · −38K
Biggest buyers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Marshall Wace, LLP Hedge fund | +33K +23.4% | 172K | $1.4M |
| Xtx Topco Ltd | +21K New position | 21K | $163,575 |
| Goldman Sachs Group Inc | +15K New position | 15K | $120,157 |
| Citadel Advisors LLC Hedge fund | +11K New position | 11K | $82,877 |
| Vanguard Fiduciary Trust Co Index funds | +9,042 +22.8% | 49K | $384,125 |
| Blackrock, Inc. Index funds | +8,974 +8.8% | 111K | $875,790 |
| Geode Capital Management, LLC Index funds | +5,139 +6.9% | 80K | $631,301 |
| Integrated Wealth Concepts LLC | +4,000 New position | 4,000 | $31,560 |
| Jpmorgan Chase & Co | +3,636 New position | 3,636 | $28,325 |
| Group One Trading LLC | +2,890 +350.7% | 3,714 | $29,303 |
| Simplex Trading, LLC | +1,528 +49.8% | 4,598 | $36,278 |
| Sbi Securities Co., Ltd. | +700 +20.1% | 4,182 | $32,996 |
| Continuum Advisory, LLC | +47 New position | 47 | $371 |
| Larson Financial Group LLC | +5 New position | 5 | $39 |
| Whittier Trust Co Of Nevada Inc | +1 New position | 1 | $8 |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Marshall Wace, LLP Hedge fund | +33K +23.4% | 172K | $1.4M |
| Citadel Advisors LLC Hedge fund | +11K New position | 11K | $82,877 |
Biggest sellers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Susquehanna International Group, LLP | −47K −44.6% | 58K | $460,208 |
| American Century Companies Inc Active manager | −34K −54.6% | 28K | $223,390 |
| Two Sigma Investments, LP Hedge fund | −19K Sold out | 0 | — |
| Vontobel Holding Ltd. | −15K −11.2% | 123K | $970,273 |
| Morgan Stanley | −9,562 −44.1% | 12K | $95,769 |
| UBS Group AG | −6,546 −93.1% | 484 | $3,818 |
| Vanguard Capital Management LLC Index funds | −6,367 −2.2% | 288K | $2.3M |
| Barclays PLC | −6,340 −97.4% | 167 | $1,318 |
| Invesco Ltd. | −1,573 −10.8% | 13K | $102,365 |
| Charles Schwab Investment Management Inc Index funds | −581 −1.8% | 31K | $244,977 |
| Tower Research Capital LLC (TRC) | −478 −60.2% | 316 | $2,493 |
| FMR LLC Active manager | −224 −12.8% | 1,528 | $12,056 |
| Physician Wealth Advisors, Inc. | −142 Sold out | 0 | — |
| Royal Bank Of Canada | −97 Sold out | 0 | — |
| Sound Income Strategies, LLC | −8 Sold out | 0 | — |
| Arax Advisory Partners | −6 Sold out | 0 | — |
| Allworth Financial LP | −4 Sold out | 0 | — |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| American Century Companies Inc Active manager | −34K −54.6% | 28K | $223,390 |
| Two Sigma Investments, LP Hedge fund | −19K Sold out | 0 | — |
| FMR LLC Active manager | −224 −12.8% | 1,528 | $12,056 |
New positions
| Institution | Shares | Value June 30, 2026 |
|---|---|---|
| Xtx Topco Ltd | 21K | $163,575 |
| Goldman Sachs Group Inc | 15K | $120,157 |
| Citadel Advisors LLCHedge fund | 11K | $82,877 |
| Integrated Wealth Concepts LLC | 4,000 | $31,560 |
| Jpmorgan Chase & Co | 3,636 | $28,325 |
| Continuum Advisory, LLC | 47 | $371 |
| Larson Financial Group LLC | 5 | $39 |
| Whittier Trust Co Of Nevada Inc | 1 | $8 |
Sold out
| Institution | Shares | Value March 31, 2026 |
|---|---|---|
| Two Sigma Investments, LPHedge fund | 19K | $166,703 |
| Physician Wealth Advisors, Inc. | 142 | $1,260 |
| Royal Bank Of Canada | 97 | $1,000 |
| Sound Income Strategies, LLC | 8 | $71 |
| Allworth Financial LP | 4 | $36 |
| Arax Advisory Partners | 6 | $18 |
Who holds the shares
- Institutions reporting
- 35
- Ten largest holders
- 92.4% of 13F-reported shares
- Index fund managers
- 26.7% of 13F-reported shares
- Active managers and hedge funds
- 9.3% of 13F-reported shares
| Type | Bought | Sold | New | Sold out | Net change in shares | Net % |
|---|---|---|---|---|---|---|
| Active managers and hedge funds | 2 | 3 | 1 | 1 | −9,811 | −4.4% |
| Index fund managers | 3 | 2 | 0 | 0 | +16K | +2.7% |
| Other institutions | 10 | 12 | 7 | 5 | −38K | −2.6% |