Company · CIK 0001728117 · SIC 2834 — Pharmaceutical Preparations · Nasdaq
Gossamer Bio, Inc. · GOSS
Insider activity reported against this company. All insider holders · On EDGAR ↗
Reported at this company — common stock
| Trade | Reported (ET) | Insider | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Feb 12, 2019 CForm 4 → | Feb 12, 5:54 pm EST | ARCH Venture Partners IX, LLC +710% Owner | 8,055,916 | — | — | 4,027,958 | — | plan? |
| Feb 12, 2019 CForm 4 → | Feb 12, 5:46 pm EST | Omega Fund V, L.P. +310% Owner | 6,953,416 | — | — | 6,953,416 | — | plan? |
| Feb 12, 2019 CForm 4 → | Feb 12, 5:44 pm EST | Kristina BurowDirector | 8,055,916 | — | — | 4,027,958 | — | plan? |
| Feb 12, 2019 PForm 4 → | Feb 12, 5:40 pm EST | Russell J. CoxDirector | 7,200 | $16.00 | $115,200 | 7,200 | — | plan? |
| Feb 12, 2019 CForm 4 → | Feb 12, 5:38 pm EST | Thomas O DanielDirector | 38,095 | — | — | 38,095 | — | plan? |
| Feb 12, 2019 PForm 4 → | Feb 12, 5:36 pm EST | Waage ChristianEVP & General Counsel | 1,550 | $16.00 | $24,800 | 501,498 | +0.31% | plan? |
| Feb 12, 2019 CForm 4 → | Feb 12, 5:36 pm EST | Waage ChristianEVP & General Counsel | 3,454 | — | — | 3,454 | — | plan? |
| Feb 12, 2019 PForm 4 → | Feb 12, 5:33 pm EST | Bryan GiraudoChief Financial Officer | 6,000 | $16.00 | $96,000 | 23,879 | +33.6% | plan? |
| Feb 12, 2019 CForm 4 → | Feb 12, 5:33 pm EST | Bryan GiraudoChief Financial Officer | 17,879 | — | — | 17,879 | — | plan? |
| Feb 12, 2019 CForm 4 → | Feb 12, 5:30 pm EST | Sheila GujrathiPresident & CEO, Director | 62,030 | — | — | 4,038,242 | — | plan? |
| Feb 12, 2019 CForm 4 → | Feb 12, 5:25 pm EST | Faheem HasnainExecutive Chairman, Director | 58,599 | — | — | 3,372,109 | — | plan? |
Reported at this company — derivatives (options, RSUs, warrants)
| Trade | Reported (ET) | Insider | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Sep 23, 2026 AForm 4 → | Sep 25, 5:17 pm EDT | Sandra MilliganDirector | 10,000 | — | — | 10,000 | — | |
| Sep 23, 2026 AForm 4 → | Sep 25, 5:04 pm EDT | Thomas O DanielDirector | 10,000 | — | — | 10,000 | — | |
| Sep 23, 2026 AForm 4 → | Sep 25, 5:01 pm EDT | Gregory Austin CiongoliDirector | 30,000 | — | — | 30,000 | — | |
| Sep 23, 2026 AForm 4 → | Sep 25, 4:55 pm EDT | Skye DrynanDirector | 10,000 | — | — | 10,000 | — | |
| Sep 23, 2026 AForm 4 → | Sep 25, 4:51 pm EDT | John D QuiselDirector | 10,000 | — | — | 10,000 | — | |
| Sep 23, 2026 AForm 4 → | Sep 25, 4:43 pm EDT | Russell J. CoxDirector | 10,000 | — | — | 10,000 | — | |
| Sep 23, 2026 AForm 4 → | Sep 25, 4:36 pm EDT | Steven D NathanDirector | 10,000 | — | — | 10,000 | — | |
| Aug 24, 2026 AForm 4 → | Aug 26, 6:13 pm EDT | Waage ChristianEVP, Tech Ops and Admin | 2,900,026 | — | — | 2,900,026 | — | |
| Aug 24, 2026 AForm 4 → | Aug 26, 6:12 pm EDT | Caryn PetersonChief Development Officer | 5,800,051 | — | — | 5,800,051 | — | |
| Aug 24, 2026 AForm 4 → | Aug 26, 6:11 pm EDT | Robert Paul Smith Jr.Chief Commercial Officer | 5,800,051 | — | — | 5,800,051 | — | |
| Aug 24, 2026 AForm 4 → | Aug 26, 6:10 pm EDT | Bryan GiraudoCOO/CFO | 5,800,076 | $1,000.00 | $25,000 | 5,800,051 | — | |
| Aug 24, 2026 AForm 4 → | Aug 26, 6:08 pm EDT | Faheem HasnainPresident & CEO, Director | 5,800,217 | $1,000.00 | $166,000 | 5,800,051 | — | |
| Jun 4, 2026 AForm 4 → | Jun 5, 5:45 pm EDT | John D QuiselDirector | 115,000 | — | — | 115,000 | — | |
| Jun 4, 2026 AForm 4 → | Jun 5, 4:30 pm EDT | Skye DrynanDirector | 115,000 | — | — | 115,000 | — | |
| Jun 4, 2026 AForm 4 → | Jun 5, 4:30 pm EDT | Thomas O DanielDirector | 115,000 | — | — | 115,000 | — | |
| Jun 4, 2026 AForm 4 → | Jun 5, 4:29 pm EDT | Russell J. CoxDirector | 115,000 | — | — | 115,000 | — | |
| Jun 4, 2026 AForm 4 → | Jun 5, 4:28 pm EDT | Sandra MilliganDirector | 115,000 | — | — | 115,000 | — | |
| Jun 4, 2026 AForm 4 → | Jun 5, 4:27 pm EDT | Steven D NathanDirector | 115,000 | — | — | 115,000 | — | |
| Feb 12, 2019 CForm 4 → | Feb 12, 5:54 pm EST | ARCH Venture Partners IX, LLC +710% Owner | 36,251,633 | — | — | 0 | — | |
| Feb 12, 2019 CForm 4 → | Feb 12, 5:46 pm EST | Omega Fund V, L.P. +310% Owner | 31,290,380 | — | — | 0 | — | |
| Feb 12, 2019 CForm 4 → | Feb 12, 5:44 pm EST | Kristina BurowDirector | 36,251,633 | — | — | 0 | — | |
| Feb 12, 2019 CForm 4 → | Feb 12, 5:38 pm EST | Thomas O DanielDirector | 171,429 | — | — | 0 | — | |
| Feb 12, 2019 CForm 4 → | Feb 12, 5:36 pm EST | Waage ChristianEVP & General Counsel | 15,543 | — | — | 0 | — | |
| Feb 12, 2019 CForm 4 → | Feb 12, 5:33 pm EST | Bryan GiraudoChief Financial Officer | 80,458 | — | — | 0 | — | |
| Feb 12, 2019 CForm 4 → | Feb 12, 5:30 pm EST | Sheila GujrathiPresident & CEO, Director | 279,139 | — | — | 0 | — | |
| Feb 12, 2019 CForm 4 → | Feb 12, 5:25 pm EST | Faheem HasnainExecutive Chairman, Director | 263,703 | — | — | 0 | — |