Chow Gregory K. 4
4 · SUTRO BIOPHARMA, INC. · Filed Jun 2, 2026
Research Summary
AI-generated summary of this filing
Sutro (STRO) CFO Gregory Chow Converts 2,500 Derivative Shares
What Happened Gregory K. Chow, Chief Financial Officer of Sutro Biopharma (STRO), reported the conversion/exercise of 2,500 derivative shares into common stock on June 2, 2026. The filing shows 2,500 shares acquired at $0.00 (conversion/settlement) and a matching 2,500-share derivative disposition at $0.00. Footnotes indicate these relate to awards that vested (RSUs) and that tax withholding was satisfied in cash rather than by withholding shares.
Key Details
- Transaction date: 2026-06-02; transaction code M (exercise/conversion of derivative).
- Reported amounts: 2,500 shares acquired @ $0.00; 2,500 shares disposed @ $0.00 (derivative entry).
- Price/value: $0.00 per share (reflects RSU conversion/settlement, not an open-market purchase).
- Shares owned after transaction: not specified in the provided excerpt of the Form 4.
- Notable footnotes:
- F1: Reporting person elected cash payment for tax withholding (no withholding shares).
- F3/F4: Each RSU converts to one common share; award vests annually 1/4th with first tranche vesting 6/2/2026.
- F2: The reported total includes 250 shares from the employee stock purchase plan (ESPP) exempt from Form 4 reporting rules.
- Timeliness: Filing date and period both 2026-06-02; no late filing indicated.
Context This filing reflects equity award vesting/derivative conversion (RSUs converting into common stock) rather than an open-market purchase or sale. Because taxes were paid in cash per the filing, there is no indication shares were sold to cover withholding. Vesting/settlement entries are routine for executives and do not by themselves signal a buy or sell decision.
Insider Transaction Report
- Exercise/Conversion
Common Stock
[F1][F2]2026-06-02+2,500→ 4,725 total - Exercise/Conversion
Restricted Stock Units (RSUs)
[F3][F4]2026-06-02−2,500→ 7,500 totalExp: 2029-06-02→ Common Stock (2,500 underlying)
Footnotes (4)
- [F1]For avoidance of doubt, the reporting person elected to satisfy tax withholding liabilities in cash in lieu of withholding shares.
- [F2]The reported total includes 250 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).
- [F3]Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement.
- [F4]The award vested or vests annually as to 1/4th of the total award, subject to the reporting person's continued service to the Issuer on each vesting date, with the first tranche vested on June 2, 2026.