SUTRO BIOPHARMA, INC. 4

Jagpal Sukhi received a stock option award for 10,000 shares of Sutro Biopharma, Inc. common stock at a $26.09 exercise price.

On June 5, 2026, Sutro Biopharma, Inc. granted Jagpal Sukhi a stock option to purchase 10,000 shares of common stock at an exercise price of $26.09 per share, implying a notional award value of approximately $260,900. The option vests in equal monthly installments of 8.33% beginning July 5, 2026, and will be fully vested and exercisable by the earlier of the company’s 2027 annual stockholders meeting or June 5, 2027, contingent on continued service. Following this grant, the reporting person beneficially owns 10,000 shares (underlying the option) on a derivative basis, reflecting a typical equity compensation award rather than an open‑market purchase or sale.

Filing Facts

CIK

1382101

Ticker

STRO

Form

4

Source Type

sec

Accession

0001554591-26-000002

Alert Tier

6