Gossamer Bio, Inc.: which funds bought and sold
Institutions that bought and sold Gossamer Bio 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, 89 institutions that filed 13F reports for both quarters added to or opened positions in Gossamer Bio, and 85 cut or closed them. Together they added a net 205.0M shares, +116.0% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 96.4M shares (+201.0%); index fund managers were net sellers of 18.3M shares (−43.1%). 26 opened a new position and 41 sold out entirely.
Bought, Q2 2026 89 institutions, 26 of them new holders Sold, Q2 2026 85 institutions, 41 of them sold out
Net change, all compared +205.0M shares (+116.0%)
Net change, active managers +96.4M shares (+201.0%), 14 bought, 12 sold
Buyers versus sellers
89 bought 34 85 sold
Active managers and hedge funds 14 bought · 12 sold · +96.4M
Index fund managers 2 bought · 9 sold · −18.3M
Other institutions 73 bought · 64 sold · +126.9M
Biggest buyers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| D. E. Shaw & Co., Inc. Hedge fund | +40.6M +10417.7% | 41.0M | $6.7M |
| Deepcurrents Investment Group LLC | +37.7M New position | 37.7M | $6M |
| 683 Capital Management, LLC Hedge fund | +34.2M +684.0% | 39.2M | $6.5M |
| Context Capital Management, LLC | +28.9M New position | 28.9M | $4.8M |
| Worth Venture Partners, LLC | +25.0M New position | 25.0M | $4.1M |
| Wolverine Asset Management LLC | +12.9M New position | 12.9M | $2.1M |
| Gsa Capital Partners LLP | +11.7M +360.5% | 15.0M | $2.5M |
| Renaissance Technologies LLC Hedge fund | +10.4M +854.9% | 11.6M | $1.9M |
| Arrowstreet Capital, Limited Partnership Hedge fund | +7.6M New position | 7.6M | $1.2M |
| AQR Capital Management LLC Hedge fund | +5.5M +54.3% | 15.6M | $2.6M |
| Barclays PLC | +4.8M +155.5% | 7.8M | $1.3M |
| Kalehua Capital Management LLC | +4.6M +25.9% | 22.3M | $3.7M |
| Two Sigma Investments, LP Hedge fund | +2.7M +55.5% | 7.4M | $1.2M |
| Millennium Management LLC Hedge fund | +2.2M +1182.0% | 2.4M | $395,473 |
| Qube Research & Technologies Ltd Hedge fund | +2.1M +43.7% | 7.1M | $1.2M |
| Marshall Wace, LLP Hedge fund | +2.1M New position | 2.1M | $338,399 |
| Corient Private Wealth LP | +1.6M +41.3% | 5.6M | $927,142 |
| HSBC Holdings PLC | +1.5M +1289.4% | 1.6M | $267,389 |
| UBS Group AG | +1.2M +64.2% | 3.1M | $510,474 |
| Jpmorgan Chase & Co | +1.1M +1225.5% | 1.2M | $201,495 |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| D. E. Shaw & Co., Inc. Hedge fund | +40.6M +10417.7% | 41.0M | $6.7M |
| 683 Capital Management, LLC Hedge fund | +34.2M +684.0% | 39.2M | $6.5M |
| Renaissance Technologies LLC Hedge fund | +10.4M +854.9% | 11.6M | $1.9M |
| Arrowstreet Capital, Limited Partnership Hedge fund | +7.6M New position | 7.6M | $1.2M |
| AQR Capital Management LLC Hedge fund | +5.5M +54.3% | 15.6M | $2.6M |
| Two Sigma Investments, LP Hedge fund | +2.7M +55.5% | 7.4M | $1.2M |
| Millennium Management LLC Hedge fund | +2.2M +1182.0% | 2.4M | $395,473 |
| Qube Research & Technologies Ltd Hedge fund | +2.1M +43.7% | 7.1M | $1.2M |
| Marshall Wace, LLP Hedge fund | +2.1M New position | 2.1M | $338,399 |
| Jacobs Levy Equity Management, Inc Active manager | +492K +29.0% | 2.2M | $360,046 |
Biggest sellers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Blackrock, Inc. Index funds | −9.2M −54.4% | 7.7M | $1.3M |
| Balyasny Asset Management L.P. Hedge fund | −5.8M −98.2% | 104K | $17,157 |
| Acadian Asset Management LLC Active manager | −3.5M −66.0% | 1.8M | $293,000 |
| State Street Corp Index funds | −3.3M −74.6% | 1.1M | $183,483 |
| Bank Of America Corp | −2.8M −87.5% | 397K | $65,063 |
| Geode Capital Management, LLC Index funds | −2.5M −49.8% | 2.5M | $408,706 |
| Vanguard Portfolio Management LLC Index funds | −1.6M −74.8% | 544K | $89,795 |
| Rock Springs Capital Management LP Hedge fund | −1.6M Sold out | 0 | — |
| Mackenzie Financial Corp | −1.5M Sold out | 0 | — |
| Northern Trust Corp Index funds | −950K −67.5% | 458K | $75,469 |
| Voya Investment Management LLC | −867K Sold out | 0 | — |
| Squarepoint Ops LLC Hedge fund | −842K −24.8% | 2.6M | $420,780 |
| Xtx Topco Ltd | −679K Sold out | 0 | — |
| Connor, Clark & Lunn Investment Management Ltd. | −658K Sold out | 0 | — |
| Charles Schwab Investment Management Inc Index funds | −518K −34.3% | 993K | $163,370 |
| Bank Of New York Mellon Corp | −383K −89.3% | 46K | $7,524 |
| Ensign Peak Advisors, Inc | −251K −14.8% | 1.5M | $238,831 |
| Deutsche Bank Ag\ | −199K −15.3% | 1.1M | $188,095 |
| Vanguard Fiduciary Trust Co Index funds | −159K −11.3% | 1.2M | $205,490 |
| Price T Rowe Associates Inc Active manager | −132K Sold out | 0 | — |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Balyasny Asset Management L.P. Hedge fund | −5.8M −98.2% | 104K | $17,157 |
| Acadian Asset Management LLC Active manager | −3.5M −66.0% | 1.8M | $293,000 |
| Rock Springs Capital Management LP Hedge fund | −1.6M Sold out | 0 | — |
| Squarepoint Ops LLC Hedge fund | −842K −24.8% | 2.6M | $420,780 |
| Price T Rowe Associates Inc Active manager | −132K Sold out | 0 | — |
| Los Angeles Capital Management LLC Active manager | −131K Sold out | 0 | — |
| Victory Capital Management Inc Active manager | −107K Sold out | 0 | — |
| ADAR1 Capital Management, LLC Hedge fund | −75K −26.1% | 213K | $34,983 |
| Intech Investment Management LLC Active manager | −54K Sold out | 0 | — |
| Letko, Brosseau & Associates Inc Active manager | −39K Sold out | 0 | — |
New positions
| Institution | Shares | Value June 30, 2026 |
|---|---|---|
| Deepcurrents Investment Group LLC | 37.7M | $6M |
| Context Capital Management, LLC | 28.9M | $4.8M |
| Worth Venture Partners, LLC | 25.0M | $4.1M |
| Wolverine Asset Management LLC | 12.9M | $2.1M |
| Arrowstreet Capital, Limited PartnershipHedge fund | 7.6M | $1.2M |
| Marshall Wace, LLPHedge fund | 2.1M | $338,399 |
| Eventide Asset Management, LLC | 163K | $26,804 |
| Schonfeld Strategic Advisors LLCHedge fund | 133K | $21,871 |
| Arax Advisory Partners | 108K | $17,810 |
| Bronte Capital Management Pty Ltd. | 68K | $11,152 |
Sold out
| Institution | Shares | Value March 31, 2026 |
|---|---|---|
| Rock Springs Capital Management LPHedge fund | 1.6M | $528,718 |
| Mackenzie Financial Corp | 1.5M | $504,879 |
| Voya Investment Management LLC | 867K | $284,683 |
| Xtx Topco Ltd | 679K | $223,093 |
| Connor, Clark & Lunn Investment Management Ltd. | 658K | $216,226 |
| Price T Rowe Associates IncActive manager | 132K | $44,000 |
| Los Angeles Capital Management LLCActive manager | 131K | $43,105 |
| Nine Masts Capital Ltd | 115K | $37,701 |
| Victory Capital Management IncActive manager | 107K | $35,196 |
| Mirae Asset Global Etfs Holdings Ltd. | 91K | $30,031 |
Who holds the shares
- Institutions reporting
- 168
- Ten largest holders
- 65.3% of 13F-reported shares
- Index fund managers
- 6.3% of 13F-reported shares
- Active managers and hedge funds
- 37.8% of 13F-reported shares
| Type | Bought | Sold | New | Sold out | Net change in shares | Net % |
|---|---|---|---|---|---|---|
| Active managers and hedge funds | 14 | 12 | 3 | 7 | +96.4M | +201.0% |
| Index fund managers | 2 | 9 | 0 | 1 | −18.3M | −43.1% |
| Other institutions | 73 | 64 | 23 | 33 | +126.9M | +146.7% |