Through the 90-day period concluding December 12, 2025, Gossamer Bio's top three insider stakeholders include President & CEO Faheem Hasnain (5.97Mn shares), EVP And Tech Ops And Admin Waage Christian (756.83K shares), COO/Cfo Bryan Giraudo (754.00K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Faheem Hasnain | President & CEO | 5,965,866 | 02 Oct, 2025 |
| Waage Christian | EVP And Tech Ops And Admin | 756,826 | 02 Oct, 2025 |
| Bryan Giraudo | COO/Cfo | 753,997 | 02 Oct, 2025 |
| Richard Aranda | Chief Medical Officer | 369,356 | 02 Oct, 2025 |
| Luisa Salter-Cid | Chief Scientific Officer | 206,065 | 25 Mar, 2021 |
| Robert Paul Jr Smith | Chief Commercial Officer | 187,500 | 02 Oct, 2025 |
| Caryn Peterson | EVP And Regulatory Affairs | 174,833 | 02 Oct, 2025 |
| Sandra Milligan | 90,050 | 20 Aug, 2025 | |
| Laura Carter | Chief Scientific Officer | 76,263 | 20 Mar, 2023 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 01 Oct, 2025 | Faheem Hasnain | Common Stock | A | 437,500 | $0.00 | 557,793 | D | A |
| 01 Oct, 2025 | Waage Christian | Common Stock | A | 125,000 | $0.00 | 710,934 | D | A |
| 01 Oct, 2025 | Bryan Giraudo | Common Stock | A | 181,250 | $0.00 | 273,987 | D | A |
| 01 Oct, 2025 | Caryn Peterson | Common Stock | A | 125,000 | $0.00 | 174,833 | D | A |
| 01 Oct, 2025 | Richard Aranda | Common Stock | A | 162,500 | $0.00 | 369,356 | D | A |
| 01 Oct, 2025 | Robert Paul Jr Smith | Common Stock | A | 162,500 | $0.00 | 162,500 | D | A |
| 19 Aug, 2025 | Sandra Milligan | Common Stock | A | 26,050 | $1.92 | 58,050 | D | P |
| 19 Aug, 2025 | Sandra Milligan | - | - | 58,050 | D | |||
| 24 Jun, 2024 | Richard Aranda | - | - | 196,891 | D | |||
| 24 Jun, 2024 | Richard Aranda | Common Stock | D | 1,908 | $0.66 | 196,891 | D | S |
| 21 Jun, 2024 | Faheem Hasnain | - | - | 5,408,073 | I | |||
| 21 Jun, 2024 | Faheem Hasnain | Common Stock | A | 372,000 | $0.67 | 5,408,073 | I | P |
| 18 Jun, 2024 | Bryan Giraudo | - | - | 480,010 | I | |||
| 18 Jun, 2024 | Bryan Giraudo | Common Stock | A | 100,000 | $0.59 | 480,010 | I | P |
| 17 Jun, 2024 | Robert Paul Jr Smith | - | - | 25,000 | I | |||
| 17 Jun, 2024 | Robert Paul Jr Smith | Common Stock | A | 25,000 | $0.60 | 25,000 | I | P |
| 27 Mar, 2024 | Bryan Giraudo | Common Stock | D | 6,430 | $1.16 | 92,737 | D | S |
| 27 Mar, 2024 | Faheem Hasnain | - | - | 120,293 | D | |||
| 27 Mar, 2024 | Faheem Hasnain | Common Stock | D | 23,172 | $1.16 | 120,293 | D | S |
| 27 Mar, 2024 | Waage Christian | Common Stock | D | 6,430 | $1.16 | 585,934 | D | S |