SUTRO BIOPHARMA, INC. 4

Director James P. Panek received an option award for 10,000 shares of Sutro Biopharma, Inc. common stock at an exercise price of $26.09 per share.

On June 5, 2026, James P. Panek received a stock option award from Sutro Biopharma, Inc. for 10,000 shares of common stock at an exercise price of $26.09 per share, with no shares vested at grant. The option vests in equal monthly installments of approximately 8.33% beginning July 5, 2026 and will be fully vested by the earlier of the company’s 2027 annual stockholders meeting or June 5, 2027, and will expire on June 5, 2036 if not exercised. Following this grant, Mr. Panek holds 10,000 derivative securities (options) representing 10,000 underlying shares of common stock in a direct ownership capacity.

Filing Facts

CIK

1382101

Ticker

STRO

Form

4

Source Type

sec

Accession

0001217412-26-000002

Alert Tier

5