Oliver Dolan - 02 Feb 2026 Form 4 Insider Report for Korro Bio, Inc. (KRRO)

Role: Senior Vice President, Finance
Signature: /s/ Jeffrey Cerio, Attorney-in-fact
Issuer symbol: KRRO
Transactions as of: 02 Feb 2026
Net transactions value: $0
Form type: 4
Filing time: 03 Feb 2026, 16:11:04 UTC
Previous filing: 16 Dec 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Dolan Oliver	Senior Vice President, Finance	C/O KORRO BIO, INC., 60 FIRST STREET, 2ND FLOOR, SUITE 250, CAMBRIDGE	/s/ Jeffrey Cerio, Attorney-in-fact	03 Feb 2026	0002053835

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	KRRO	Stock Option (Right to Buy)	Award	$0	+15,000		$0.000000	15,000	02 Feb 2026	Common Stock	15,000	$13.05	Direct	F1

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

Explanation of Responses:

Id	Content
F1	The shares subject to the option vest in 48 equal monthly installments commencing from February 2, 2026, subject to the Reporting Person's continued service on each such vesting date.