Arturo Molina - Sep 24, 2021 Form 4 Insider Report for SUTRO BIOPHARMA, INC. (STRO)

Role: Chief Medical Officer
Signature: /s/ Edward C. Albini as attorney-in-fact for Arturo Molina
Stock symbol: STRO
Transactions as of: Sep 24, 2021
Transactions value $: -$57,228
Form type: 4
Date filed: 9/28/2021, 06:57 PM
Next filing: Jan 13, 2022

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	STRO	Common Stock	Options Exercise	$0	+8.61K	+41.27%	$0.00	29.5K	Sep 24, 2021	Direct
transaction	STRO	Common Stock	Tax liability	-$57.2K	-2.98K	-10.1%	$19.23	26.5K	Sep 24, 2021	Direct	F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	STRO	Restricted Stock Unit (RSU)	Options Exercise	$0	-8.61K	-100%	$0.00^*	0	Sep 24, 2021	Common Stock	8.61K		Direct	F2, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents the number of shares of Common Stock that have been withheld by the issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of the RSUs and does not represent a sale by the reporting person.
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 1/3rd of the total shares annually beginning on September 26, 2019, subject to continued service through each vesting date.