Michael Dybbs - 06 Jun 2025 Form 4 Insider Report for SUTRO BIOPHARMA, INC. (STRO)

Role: Director
Signature: /s/ David Pauling as attorney-in-fact
Issuer symbol: STRO
Transactions as of: 06 Jun 2025
Net transactions value: $0
Form type: 4
Filing time: 10 Jun 2025, 16:08:22 UTC
Previous filing: 09 Jun 2025
Next filing: 29 Dec 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Dybbs Michael	Director	C/O SUTRO BIOPHARMA, INC., 111 OYSTER POINT BLVD., SOUTH SAN FRANCISCO	/s/ David Pauling as attorney-in-fact	10 Jun 2025	0001601264

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	Stock Option (right to buy)	Award	$0	+50,000		$0.000000	50,000	06 Jun 2025	Common Stock	50,000	$0.8500	Direct	F1

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

Explanation of Responses:

Id	Content
F1	The option vests as to 8.33% of the total shares monthly, commencing July 6, 2025, with 100% of the total shares vested and exercisable on the earlier of the date of the issuer's 2026 annual stockholders meeting or June 6, 2026, subject to the reporting person's provision of service to the issuer on each vesting date.