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
No reported common-stock activity in this period.
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 | — |