Form 4 for STRO SUTRO BIOPHARMA, INC.
Accepted 2026-09-22 16:09:25 ET · period of report 2026-09-18 · accession 0001992979-26-000004 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| D | 2026-09-22 16:09 | 2026-09-18 | STRO | Gerber Hans-Peter | CSO | M - OptEx | $0.00 | +3,750 | 13.7K | +38% | $0 |
| D | 2026-09-22 16:09 | 2026-09-18 | STRO | Gerber Hans-Peter | CSO | F - Tax | $15.34 | -1,345 | 12.4K | -10% | -$20.6K |
| D | 2026-09-22 16:09 | 2026-09-18 | STRO | Gerber Hans-Peter | CSO | M - OptEx | $0.00 | -3,750 | 3,750 | -50% | $0 |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock | 2026-09-18 | M | A | 3,750 | $0.00 | 13,712 | D | — | — | (F1) The 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). |
| 2 | Common | Common Stock | 2026-09-18 | F | D | 1,345 | $15.34 | 12,367 | D | — | — | (F2) Represents 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. |
| 3 | Derivative | Restricted Stock Units (RSUs) | 2026-09-18 | M | D | 3,750 | $0.00 | 3,750 | D | — · — to 2027-09-18 | 3,750 Common Stock | (F3) Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement. (F4) The 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. |