Institutional Ownership
Gossamer Bio Inc
CUSIP 38341P102COMGOSSQ1 2026
13D / 13G Filings
43
Schedule 13D/13G on record
Beneficial Filers
21
Distinct reporting persons
Largest Stake
29.5%
Max % of class reported
Institutional Holders
178
13F filers (latest quarter)
Beneficial Owners — Schedule 13D / 13G
43 filings · latest Mar 2, 2026
| # | Filed | Reporting Person | Form | % of Class | Shares | Filing |
|---|---|---|---|---|---|---|
| 1 | Mar 2, 2026 | 683 Capital Management, LLC | 13G | 5.2% | 12.33M | SEC |
| 2 | Feb 24, 2026 | Growth Equity Opportunities 18 Vge, LLC | 13D/A | 1.7% | — | SEC |
| 3 | Feb 17, 2026 | Octagon Capital Advisors LP | 13G/A | 6.5% | 15.14M | SEC |
| 4 | Jan 21, 2026 | Blackrock, Inc. | 13G/A | 6.5% | 15.07M | SEC |
| 5 | Jul 29, 2025 | The Vanguard Group | 13G | 5.0% | 11.41M | SEC |
| 6 | Jul 17, 2025 | Blackrock, Inc. | 13G | 5.3% | 12.14M | SEC |
| 7 | Feb 12, 2025 | Invus Public Equities, L.P. | 13G/A | 2.8% | 6.26M | SEC |
| 8 | Feb 5, 2025 | Octagon Capital Advisors LP | 13G | 8.6% | 19.58M | SEC |
| 9 | Jan 30, 2025 | The Vanguard Group | 13G/A | 4.4% | 10.03M | SEC |
| 10 | Nov 12, 2024 | Invus Global Management, LLC | 13G/A | 5.9% | 13.47M | SEC |
33 more beneficial-ownership filings on Premium
See the full Schedule 13D/13G history for Gossamer Bio Inc.
Unlock full historyTop Institutional Holders (13F)
Largest reported positions · latest quarter
| # | Fund | Shares | Value |
|---|---|---|---|
| 1 | Blackrock, Inc. | 16.83M | $5.53M |
| 2 | Kalehua Capital Management LLC | 10.24M | $3.36M |
| 3 | Aqr Capital Management LLC | 10.13M | $3.33M |
| 4 | Arch Venture Management, LLC | 8.06M | $2.65M |
| 5 | Octagon Capital Advisors LP | 7.75M | $2.55M |
| 6 | Samsara Biocapital, LLC | 7.22M | $2.37M |
| 7 | Balyasny Asset Management L.P. | 5.92M | $1.95M |
| 8 | Siren, L.L.C. | 5.21M | $1.71M |
| 9 | 683 Capital Management, LLC | 5.00M | $1.64M |
| 10 | Hhlr Advisors, Ltd. | 4.97M | $1.63M |