Gossamer Bio, Inc. (GOSS) Insider Ownership

Historic Insider Ownership Trends

GOSS's three largest insider shareholders as of March 23, 2026 are Faheem Hasnain (President Ceo, 5.41Mn shares), Faheem Hasnain (President Ceo, 837.79K shares), Waage Christian (Evp, Tech Ops And Admin, 814.06K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Faheem Hasnain President Ceo 0 5,408,073 24 Jun, 2024
Faheem Hasnain President Ceo 837,793 0 05 Jan, 2026
Waage Christian Evp, Tech Ops And Admin 814,061 0 05 Jan, 2026
Bryan Giraudo Coo/Cfo 0 480,010 20 Jun, 2024
Richard Aranda Chief Medical Officer 463,106 0 05 Jan, 2026
Bryan Giraudo Coo/Cfo 389,737 0 05 Jan, 2026
Robert Paul Jr Smith Chief Commercial Officer 260,898 0 05 Jan, 2026
Caryn Peterson Evp, Regulatory Affairs 259,333 0 05 Jan, 2026
Sandra Milligan 58,050 0 20 Aug, 2025
Waage Christian Evp, Tech Ops And Admin 0 45,892 26 Jul, 2023
Sandra Milligan 0 32,000 17 Nov, 2023
Robert Paul Jr Smith Chief Commercial Officer 0 25,000 20 Jun, 2024

* 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
19 Mar, 2026 Waage Christian Stock Option (Right to Buy) D 506,250 - 0 D D
19 Mar, 2026 Caryn Peterson Stock Option (Right to Buy) D 506,250 - 0 D D
19 Mar, 2026 Richard Aranda Stock Option (Right to Buy) D 562,500 - 0 D D
19 Mar, 2026 Faheem Hasnain Stock Option (Right to Buy) D 1,680,000 - 0 D D
19 Mar, 2026 Robert Paul Jr Smith Stock Option (Right to Buy) D 562,500 - 0 D D
19 Mar, 2026 Bryan Giraudo Stock Option (Right to Buy) D 693,750 - 0 D D
19 Mar, 2026 Bryan Giraudo Stock Option (Right to Buy) D 638,000 - 0 D D
19 Mar, 2026 Waage Christian Stock Option (Right to Buy) D 440,000 - 0 D D
19 Mar, 2026 Robert Paul Jr Smith Stock Option (Right to Buy) D 572,000 - 0 D D
19 Mar, 2026 Faheem Hasnain Stock Option (Right to Buy) D 1,540,000 - 0 D D
19 Mar, 2026 Caryn Peterson Stock Option (Right to Buy) D 440,000 - 0 D D
19 Mar, 2026 Richard Aranda Stock Option (Right to Buy) D 572,000 - 0 D D
19 Mar, 2026 Robert Paul Jr Smith Stock Option (Right to Buy) A 562,500 - 562,500 D A
19 Mar, 2026 Richard Aranda Stock Option (Right to Buy) D 487,500 - 0 D D
19 Mar, 2026 Bryan Giraudo Stock Option (Right to Buy) D 543,750 - 0 D D
19 Mar, 2026 Faheem Hasnain Stock Option (Right to Buy) D 1,312,500 - 0 D D
19 Mar, 2026 Waage Christian Stock Option (Right to Buy) D 375,000 - 0 D D
19 Mar, 2026 Caryn Peterson Stock Option (Right to Buy) D 375,000 - 0 D D
19 Mar, 2026 Caryn Peterson Stock Option (Right to Buy) D 125,000 - 0 D D
19 Mar, 2026 Richard Aranda Stock Option (Right to Buy) D 162,500 - 0 D D