SUTRO BIOPHARMA, INC. 4

Connie Matsui, an insider of Sutro Biopharma, Inc., was granted stock options for 10,000 shares of common stock at an exercise price of $26.09 on June 5, 2026.

On June 5, 2026, Connie Matsui received a grant of stock options from Sutro Biopharma, Inc. covering 10,000 shares of common stock at an exercise price of $26.09 per share, with no shares immediately exercisable. The option will vest in equal monthly installments of approximately 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, and will expire on June 5, 2036. Following this award, Matsui beneficially owns 10,000 shares (or rights to acquire 10,000 shares) of common stock on a derivative basis, with an estimated option-based notional value of approximately $260,900 at the stated exercise price, assuming current market price is roughly in line with the grant price.

Filing Facts

CIK

1382101

Ticker

STRO

Form

4

Source Type

sec

Accession

0001236537-26-000002

Alert Tier

5