SUTRO BIOPHARMA, INC. — Director's Dealing 2021

Apr 20, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: SUTRO BIOPHARMA, INC. (STRO)
CIK: 0001382101
Period of Report: 2021-04-16

Reporting Person: Hallam Trevor (Pres. Rsrch & Cf. Sctific Ofcr)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-04-16	Stock Option (right to buy Common Stock)	$20.01	A	20000	Acquired	2031-04-15	Common Stock (20000)	Direct
2021-04-16	Restricted Stock Unit (RSU)	$	A	15000	Acquired	2025-04-16	Common Stock (15000)	Direct

Footnotes

F1: The option vests as to 2.0833% of the total shares monthly, beginning on May 16, 2021, with 100% of the total shares vested and exercisable on April 16, 2025, subject to the reporting person's provision of service to the issuer on each vesting date.

F2: Each RSU represents a contingent right to receive one (1) share of the issuer's Common Stock upon settlement.

F3: The RSUs vest as to 1/4th of the total shares annually beginning on April 16, 2022, subject to continued service through each vesting date.