Form 4 for STRO SUTRO BIOPHARMA, INC.
Accepted 2026-03-03 00:00:00 ET · period of report 2026-03-01 · accession 0001992979-26-000002 · 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DM | 2026-03-03 | 2026-03-01+ | STRO | Gerber Hans-Peter | CSO | M - OptEx | $0.00 | +3,968 | 8,308 | +91% | $0 |
| DM | 2026-03-03 | 2026-03-01+ | STRO | Gerber Hans-Peter | CSO | F - Tax | $20.53 | -1,633 | 9,518 | -15% | -$33.5K |
| DM | 2026-03-03 | 2026-03-01+ | STRO | Gerber Hans-Peter | CSO | M - OptEx | $0.00 | -3,968 | 8,532 | -32% | $0 |
| DM | 2026-03-03 | 2026-03-02 | STRO | Gerber Hans-Peter | CSO | A - Grant | $0.00 | +45.0K | 5,000 | New | $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 | 2026-03-02 | M | A | 2,843 | $0.00 | 10,688 | D | — | — | |
| 2 | Common | Common Stock | 2026-03-01 | F | D | 463 | $20.47 | 7,845 | D | — | — | (F1) 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 | Common | Common Stock | 2026-03-01 | M | A | 1,125 | $0.00 | 8,308 | D | — | — | |
| 4 | Common | Common Stock | 2026-03-02 | F | D | 1,170 | $20.55 | 9,518 | D | — | — | (F1) 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. |
| 5 | Derivative | Restricted Stock Units (RSUs) | 2026-03-01 | M | D | 1,125 | $0.00 | 2,250 | D | — · — to 2028-03-01 | 1,125 Common Stock | (F2) Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement. (F3) The RSUs vested or vest as to 1/4 of the total award annually, with the first tranche vested on March 1, 2025, subject to continued service through each vesting date. |
| 6 | Derivative | Stock Option (right to buy) | 2026-03-02 | A | A | 40,000 | $0.00 | 40,000 | D | $20.55 · — to 2036-03-02 | 40,000 Common Stock | (F6) 1/48 of the total option award shall vest monthly, subject to the reporting person's continued service through each vesting date, with the first tranche vesting on April 1, 2026. |
| 7 | Derivative | Restricted Stock Units (RSUs) | 2026-03-02 | M | D | 2,843 | $0.00 | 8,532 | D | — · — to 2029-03-02 | 2,843 Common Stock | (F2) 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 March 2, 2026, subject to continued service through each vesting date. |
| 8 | Derivative | Restricted Stock Units (RSUs) | 2026-03-02 | A | A | 5,000 | $0.00 | 5,000 | D | — · — to 2030-03-01 | 5,000 Common Stock | (F2) Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement. (F5) The RSUs shall vest as to 1/4 of the total award annually, with the first tranche vesting on March 1, 2027, subject to continued service through each vesting date. |