SEC Form 4 · accession 0001628280-26-063616
Gossamer Bio, Inc. · GOSS
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Gregory Austin Ciongoli
Director
Period of report
Sep 23, 2026
Accepted (ET)
Sep 25, 2026 · 5:01 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 | 30,000 | A | — | Sep 22, 2036 | Common Stock | 30,000 | 30,000 | D |
Explanation of responses
- F11/36th of the total number of shares subject to the option vest on the last day of each one-month period thereafter, subject to the Reporting Person's continuous service to the Corporation on each such vesting date.