Gossamer Bio, Inc. (GOSS)

Latest Insider Confidence Score

2026Q1

50.3
Bullish

Company insider confidence (by quarter)

2019Q1 2026Q1

Largest shareholders

Insider Role (last 12 mo) Shares held Filed at
Stampacchia Otello Director 6,737,023 Sep 18, 2019
Omega Fund V, L.P. 10% Owner 6,553,416 Sep 23, 2019
Omega Fund V GP, L.P. 10% Owner 6,553,416 Sep 23, 2019
Omega Fund V GP Manager, Ltd. 10% Owner 6,553,416 Sep 23, 2019
Hasnain Faheem CEO 5,408,073 Oct 2, 2025

Recent buy/sell transactions

Exec date Filing date Insider Role Signal Confidence Shares % of shares Under plan? Amount (USD)
Jan 2, 2026 Jan 5, 2026 Hasnain Faheem CEO Neutral 82.5 +280,000 4.69% -
Jan 2, 2026 Jan 5, 2026 Giraudo Bryan CFO Neutral 90.0 +115,750 15.35% -
Jan 2, 2026 Jan 5, 2026 Smith Robert Paul JR Chief Commercial Officer Neutral 90.0 +93,750 48.79% -
Jan 2, 2026 Jan 5, 2026 Aranda Richard Chief Medical Officer Neutral 90.0 +93,750 25.21% -
Jan 2, 2026 Jan 5, 2026 Peterson Caryn EVP, Regulatory Affairs Neutral 90.0 +84,500 48.33% -
Jan 2, 2026 Jan 5, 2026 Christian Waage EVP, Tech Ops and Admin Neutral 90.0 +84,500 10.59% -
Oct 1, 2025 Oct 2, 2025 Smith Robert Paul JR Chief Commercial Officer Neutral 90.0 +162,500 650.00% -
Oct 1, 2025 Oct 2, 2025 Christian Waage EVP, Tech Ops and Admin Neutral 90.0 +125,000 19.11% -
Oct 1, 2025 Oct 2, 2025 Giraudo Bryan CFO Neutral 90.0 +181,250 31.65% -
Oct 1, 2025 Oct 2, 2025 Aranda Richard Chief Medical Officer Neutral 90.0 +162,500 77.60% -
Oct 1, 2025 Oct 2, 2025 Hasnain Faheem CEO Neutral 85.0 +437,500 7.91% -
Oct 1, 2025 Oct 2, 2025 Peterson Caryn EVP, Regulatory Affairs Neutral 90.0 +125,000 250.84% -
Aug 19, 2025 Aug 20, 2025 Milligan Sandra Director Buy 95.0 +26,050 81.41% $50K
Jun 25, 2025 Jun 26, 2025 Daniel Thomas O Director Neutral 52.5 - 0.00% -
Jun 25, 2025 Jun 26, 2025 Nathan Steven D Director Neutral 52.5 - 0.00% -
Jun 25, 2025 Jun 26, 2025 Cox Russell J. Director Neutral 52.5 - 0.00% -
Jun 25, 2025 Jun 26, 2025 Quisel John D Director Neutral 52.5 - 0.00% -
Jun 25, 2025 Jun 26, 2025 Milligan Sandra Director Neutral 52.5 - 0.00% -
Jun 25, 2025 Jun 26, 2025 Drynan Skye Director Neutral 52.5 - 0.00% -
Mar 4, 2025 Mar 6, 2025 Peterson Caryn EVP, Regulatory Affairs Neutral 52.5 - 0.00% -
Mar 4, 2025 Mar 6, 2025 Christian Waage EVP, Tech Ops and Admin Neutral 52.5 - 0.00% -
Mar 4, 2025 Mar 6, 2025 Smith Robert Paul JR Chief Commercial Officer Neutral 52.5 - 0.00% -
Mar 4, 2025 Mar 6, 2025 Aranda Richard Chief Medical Officer Neutral 52.5 - 0.00% -
Mar 4, 2025 Mar 6, 2025 Giraudo Bryan CFO Neutral 52.5 - 0.00% -
Mar 4, 2025 Mar 6, 2025 Hasnain Faheem CEO Neutral 52.5 - 0.00% -
Jun 24, 2024 Jun 25, 2024 Aranda Richard Chief Medical Officer Sell 50.0 -1,908 -0.95% $1.3K
Jun 21, 2024 Jun 24, 2024 Hasnain Faheem CEO Buy 92.5 +372,000 7.21% $250.3K
Jun 18, 2024 Jun 20, 2024 Giraudo Bryan CFO Buy 95.0 +100,000 26.32% $59.1K
Jun 17, 2024 Jun 20, 2024 Smith Robert Paul JR Chief Commercial Officer Buy 91.3 +25,000 100.00% $15.1K
Jun 6, 2024 Jun 6, 2024 Quisel John D Director Neutral 52.5 - 0.00% -
Jun 6, 2024 Jun 6, 2024 Milligan Sandra Director Neutral 52.5 - 0.00% -
Jun 6, 2024 Jun 6, 2024 Cox Russell J. Director Neutral 52.5 - 0.00% -
Jun 6, 2024 Jun 6, 2024 Daniel Thomas O Director Neutral 52.5 - 0.00% -
Mar 27, 2024 Mar 28, 2024 Christian Waage EVP, Tech Ops and Admin Sell 50.0 -6,430 -0.97% $7.4K
Mar 27, 2024 Mar 28, 2024 Giraudo Bryan CFO Sell 47.5 -6,430 -1.34% $7.4K
Mar 27, 2024 Mar 28, 2024 Hasnain Faheem CEO Sell 51.3 -23,172 -0.45% $26.8K
Mar 18, 2024 Mar 19, 2024 Aranda Richard Chief Medical Officer Sell 47.5 -4,018 -1.98% $5.3K
Mar 18, 2024 Mar 19, 2024 Peterson Caryn EVP, Regulatory Affairs Sell 47.5 -4,018 -7.46% $5.3K
Mar 11, 2024 Mar 12, 2024 Drynan Skye Director Neutral 52.5 - 0.00% -
Mar 11, 2024 Mar 12, 2024 Nathan Steven D Director Neutral 52.5 - 0.00% -
Mar 12, 2024 Drynan Skye Director Neutral 52.5 - 0.00% -
Mar 12, 2024 Nathan Steven D Director Neutral 52.5 - 0.00% -
Jan 2, 2024 Jan 4, 2024 Peterson Caryn EVP, Regulatory Affairs Neutral 52.5 - 0.00% -
Jan 2, 2024 Jan 4, 2024 Christian Waage EVP, Tech Ops and Admin Neutral 52.5 - 0.00% -
Jan 2, 2024 Jan 4, 2024 Aranda Richard Chief Medical Officer Neutral 52.5 - 0.00% -
Jan 2, 2024 Jan 4, 2024 Giraudo Bryan CFO Neutral 52.5 - 0.00% -
Jan 2, 2024 Jan 4, 2024 Hasnain Faheem CEO Neutral 52.5 - 0.00% -
Dec 4, 2023 Dec 5, 2023 Smith Robert Paul JR Chief Commercial Officer Neutral 52.5 - 0.00% -
Dec 5, 2023 Smith Robert Paul JR Chief Commercial Officer Neutral 52.5 - 0.00% -
Nov 28, 2023 Nov 29, 2023 Quisel John D Director Neutral 52.5 - 0.00% -
Nov 29, 2023 Quisel John D Director Neutral 52.5 - 0.00% -
Nov 20, 2023 Nov 22, 2023 Aranda Richard Chief Medical Officer Neutral 52.5 - 0.00% -
Nov 20, 2023 Nov 22, 2023 Giraudo Bryan CFO Neutral 52.5 - 0.00% -
Nov 20, 2023 Nov 22, 2023 Peterson Caryn EVP, Regulatory Affairs Neutral 52.5 - 0.00% -
Nov 20, 2023 Nov 22, 2023 Hasnain Faheem CEO Neutral 52.5 - 0.00% -
Nov 20, 2023 Nov 22, 2023 Christian Waage EVP, Tech Ops and Admin Neutral 52.5 - 0.00% -
Nov 15, 2023 Nov 17, 2023 Milligan Sandra Director Buy 91.3 +32,000 100.00% $25.2K
Nov 13, 2023 Nov 14, 2023 Giraudo Bryan CFO Buy 95.0 +200,000 71.64% $112.9K
Jul 24, 2023 Jul 26, 2023 Giraudo Bryan CFO Neutral 90.0 +54,020 27.51% -
Jul 24, 2023 Jul 26, 2023 Hasnain Faheem CEO Neutral 90.0 +540,176 11.64% -
Jul 24, 2023 Jul 26, 2023 Christian Waage EVP, Tech Ops and Admin Neutral 77.5 +13,504 2.12% -
Jun 22, 2023 Jun 26, 2023 Aranda Richard Chief Medical Officer Sell 50.0 -1,814 -0.90% $2.3K
Jun 8, 2023 Jun 9, 2023 GALA RENEE D Director Neutral 52.5 - 0.00% -
Jun 8, 2023 Jun 9, 2023 Cox Russell J. Director Neutral 52.5 - 0.00% -
Jun 8, 2023 Jun 9, 2023 Milligan Sandra Director Neutral 52.5 - 0.00% -
Jun 8, 2023 Jun 9, 2023 Daniel Thomas O Director Neutral 52.5 - 0.00% -
Jun 8, 2023 Jun 9, 2023 Burow Kristina Director Neutral 52.5 - 0.00% -
May 5, 2023 May 9, 2023 Peterson Caryn EVP, Regulatory Affairs Neutral 52.5 - 0.00% -
May 5, 2023 May 9, 2023 Aranda Richard Chief Medical Officer Neutral 52.5 - 0.00% -
May 5, 2023 May 9, 2023 Christian Waage EVP, Tech Ops and Admin Neutral 52.5 - 0.00% -
May 5, 2023 May 9, 2023 Giraudo Bryan CFO Neutral 52.5 - 0.00% -
May 5, 2023 May 9, 2023 Hasnain Faheem CEO Neutral 52.5 - 0.00% -
Apr 4, 2023 Apr 5, 2023 Giraudo Bryan CFO Buy 95.0 +55,000 32.32% $56.1K
Mar 20, 2023 Mar 22, 2023 Carter Laura Chief Scientific Officer Neutral 52.5 - 0.00% -
Mar 20, 2023 Mar 22, 2023 Peterson Caryn EVP, Regulatory Affairs Neutral 52.5 - 0.00% -
Mar 20, 2023 Mar 22, 2023 Aranda Richard Chief Medical Officer Neutral 52.5 - 0.00% -
Mar 20, 2023 Mar 22, 2023 Christian Waage EVP, Tech Ops and Admin Buy 83.8 +18,500 2.99% $22.1K
Mar 20, 2023 Mar 22, 2023 Giraudo Bryan CFO Buy 91.3 +50,000 41.61% $48.4K
Mar 20, 2023 Mar 22, 2023 Hasnain Faheem CEO Buy 100.0 +878,572 23.36% $1M
Mar 16, 2023 Mar 20, 2023 Carter Laura Chief Scientific Officer Sell 47.5 -6,029 -7.33% $6.6K
Mar 16, 2023 Mar 20, 2023 Aranda Richard Chief Medical Officer Sell 47.5 -7,563 -3.61% $8.3K
Mar 16, 2023 Mar 20, 2023 Peterson Caryn EVP, Regulatory Affairs Sell 47.5 -7,564 -12.32% $8.3K
Dec 7, 2022 Dec 9, 2022 Carter Laura Chief Scientific Officer Neutral 52.5 - 0.00% -
Dec 7, 2022 Dec 9, 2022 Peterson Caryn EVP, Regulatory Affairs Neutral 52.5 - 0.00% -
Dec 7, 2022 Dec 9, 2022 Aranda Richard Chief Medical Officer Neutral 52.5 - 0.00% -
Dec 7, 2022 Dec 9, 2022 Christian Waage EVP, Tech Ops and Admin Neutral 52.5 - 0.00% -
Dec 7, 2022 Dec 9, 2022 Giraudo Bryan CFO Neutral 52.5 - 0.00% -
Dec 7, 2022 Dec 9, 2022 Hasnain Faheem CEO Neutral 52.5 - 0.00% -
Oct 24, 2022 Oct 27, 2022 Carter Laura Chief Scientific Officer Sell 42.5 -4,876 -5.59% $58.9K
Oct 24, 2022 Oct 25, 2022 Peterson Caryn EVP, Regulatory Affairs Sell 42.5 -4,757 -7.19% $57.4K
Oct 24, 2022 Oct 25, 2022 Carter Laura Chief Scientific Officer Sell 42.5 -4,876 -5.59% $58.9K
Oct 24, 2022 Oct 25, 2022 Aranda Richard Chief Medical Officer Sell 42.5 -4,757 -2.24% $57.4K
Jun 9, 2022 Jul 15, 2022 Burow Kristina Director Neutral 52.5 - 0.00% -
Jun 9, 2022 Jul 15, 2022 Daniel Thomas O Director Neutral 52.5 - 0.00% -
Jun 9, 2022 Jul 15, 2022 Cox Russell J. Director Neutral 52.5 - 0.00% -
Jun 9, 2022 Jul 15, 2022 Bilenker Joshua H. Director Neutral 52.5 - 0.00% -
Jun 9, 2022 Jul 15, 2022 Milligan Sandra Director Neutral 52.5 - 0.00% -
Jun 9, 2022 Jul 15, 2022 GALA RENEE D Director Neutral 52.5 - 0.00% -
Jul 15, 2022 Jul 15, 2022 Carter Laura Chief Scientific Officer Buy 86.3 +6,934 8.64% $50K
Jul 15, 2022 Jul 15, 2022 Christian Waage EVP, Tech Ops and Admin Buy 78.8 +6,934 1.14% $50K