Gossamer Bio, Inc. (GOSS) Insider Ownership

Historic Ownership Trends

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).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
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.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
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