SEC Form 4 · accession 0001992979-26-000004
SUTRO BIOPHARMA, INC. · STRO
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Hans-Peter Gerber
Officer — CHIEF SCIENTIFIC OFFICER
Period of report
Sep 18, 2026
Accepted (ET)
Sep 22, 2026 · 4:09 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0001382101
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common StockF1 | Sep 18, 2026 | M | 3,750 | $0.00 | A | 13,712 | D | |
| Common StockF2 | Sep 18, 2026 | F | 1,345 | $15.34 | D | 12,367 | D |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Restricted Stock Units (RSUs)F3,F4 | — | Sep 18, 2026 | M | 3,750 | D | — | Sep 18, 2027 | Common Stock | 3,750 | 3,750 | D |
Explanation of responses
- F1The reported total includes 444 shares of Common Stock acquired by the reporting person in one or more transactions with the Issuer pursuant to its Employee Stock Purchase Plan, which transactions are exempt pursuant to Rules 16a3(f)(1)(i)(B) and 16b3(c).
- F2Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of restricted stock units; does not represent a sale by the reporting person.
- F3Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement.
- F4The RSUs vested or vest as to 1/4 of the total award annually, with the first tranche vested on September 18, 2024, subject to the reporting person's continued service through each vesting date.