GOSS: Gossamer Bio, Inc. insider trading, 5% holders and institutional ownership
From public SEC filings: open-market insider purchases and sales (Form 4, last 180 days), holders of 5% or more (Schedules 13D and 13G) and institutional ownership (Form 13F). Insider and 5% data delayed 48 hours.
Insider trading
0 open-market buys totaling - and 0 sales totaling - in the last 180 days.
Activist and 5% holders
| Filed | What | Holder | Stake | Change | Filing |
|---|---|---|---|---|---|
| 2026-10-08 | 13D stake raised | D. E. Shaw Valence Portfolios, L.L.C. | 6.00% | +0.90 pts | SEC |
| 2026-09-28 | 13D stake cut | D. E. Shaw Valence Portfolios, L.L.C. | 5.10% | -0.90 pts | SEC |
| 2026-08-24 | 13D amendment | D. E. Shaw Valence Portfolios, L.L.C. | 6.00% | SEC |
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