Nicki Vasquez - 29 Jan 2022 Form 4 Insider Report for SUTRO BIOPHARMA, INC. (STRO)

Role: Chief Port. Strat & Alnce Ofcr
Signature: /s/ Edward C. Albini as attorney-in-fact for Nicki Vasquez
Issuer symbol: STRO
Transactions as of: 29 Jan 2022
Net transactions value: -$10,639
Form type: 4
Filing time: 01 Feb 2022, 19:39:15 UTC
Previous filing: 28 Sep 2021
Next filing: 07 Mar 2022
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	STRO	Common Stock	Options Exercise	$0	+2,500	+34%	$0.000000	9,770	29 Jan 2022	Direct
transaction	STRO	Common Stock	Tax liability	$10,639	-1,024	-10%	$10.39	8,746	29 Jan 2022	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	-2,500	-33%	$0.000000	5,000	29 Jan 2022	Common Stock	2,500		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 1/4th of the total shares annually beginning on January 29, 2021, subject to continued service through each vesting date.