Gregory K. Chow - 15 Oct 2025 Form 4 Insider Report for SUTRO BIOPHARMA, INC. (STRO)

Role: CFO
Signature: /s/ David Pauling as attorney-in-fact for Gregory K. Chow
Issuer symbol: STRO
Transactions as of: 15 Oct 2025
Net transactions value: +$15,998
Form type: 4
Filing time: 16 Oct 2025, 08:18:45 UTC
Previous filing: 02 Jun 2025
Next filing: 29 Dec 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Chow Gregory K.	CFO	C/O SUTRO BIOPHARMA, INC., 111 OYSTER POINT BOULEVARD, SOUTH SAN FRANCISCO	/s/ David Pauling as attorney-in-fact for Gregory K. Chow	16 Oct 2025	0001761333

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	STRO	Common Stock	Purchase	$15,998	+19,750		$0.8100	19,750	15 Oct 2025	Direct	F1

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

Explanation of Responses:

Id	Content
F1	The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $0.8099 to $0.8100, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

Content

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $0.8099 to $0.8100, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.