Hans-Peter Gerber - Oct 15, 2025 Form 4 Insider Report for SUTRO BIOPHARMA, INC. (STRO)

Role: CHIEF SCIENTIFIC OFFICER
Signature: /s/ David Pauling as attorney-in-fact for Hans-Peter Gerber
Stock symbol: STRO
Transactions as of: Oct 15, 2025
Transactions value $: $13,607
Form type: 4
Date filed: 10/16/2025, 08:19 AM
Previous filing: Sep 22, 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Gerber Hans-Peter	CHIEF SCIENTIFIC OFFICER	C/O SUTRO BIOPHARMA, INC., 111 OYSTER POINT BLVD., SOUTH SAN FRANCISCO	/s/ David Pauling as attorney-in-fact for Hans-Peter Gerber	2025-10-16	0001992979

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	STRO	Common Stock	Purchase	$13.6K	+17K	+31%	$0.80	71.8K	Oct 15, 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 $0.7932 to $0.8015, 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 $0.7932 to $0.8015, 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.