SEC Form 4 · accession 0001628280-26-063593
Gossamer Bio, Inc. · GOSS
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Steven D Nathan
Director
Period of report
Sep 23, 2026
Accepted (ET)
Sep 25, 2026 · 4:36 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0001728117
Table I — non-derivative securities
No Table I lines on this filing.
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Stock Option (Right to Buy)F1 | $10.99 | Sep 23, 2026 | A | 10,000 | A | — | Sep 22, 2036 | Common Stock | 10,000 | 10,000 | D |
Explanation of responses
- F1The entire number of shares subject to this option becomes fully vested and exercisable on the first anniversary of the grant date, subject to the Reporting Person's continued service on the board of directors of the Issuer through such vesting date.