Jeffrey Cerio - 15 Dec 2025 Form 4 Insider Report for Korro Bio, Inc. (KRRO)

Role: General Counsel
Signature: /s/ Jeffrey Cerio
Issuer symbol: KRRO
Transactions as of: 15 Dec 2025
Net transactions value: $0
Form type: 4
Filing time: 16 Dec 2025, 16:07:03 UTC
Previous filing: 05 Feb 2025
Next filing: 03 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Cerio Jeffrey	General Counsel	C/O KORRO BIO, INC., 60 FIRST STREET, 2ND FLOOR, SUITE 250, CAMBRIDGE	/s/ Jeffrey Cerio	16 Dec 2025	0002033618

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	KRRO	Common Stock	Award	$0	+41,902		$0.000000	41,902	15 Dec 2025	Direct	F1

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

Explanation of Responses:

Id	Content
F1	Represents shares of common stock issuable upon settlement of a restricted stock unit (RSU) granted under the Issuer's 2023 Stock Option and Incentive Plan (the 2023 Plan) that will vest as follows: 50% on June 15, 2026 and 50% on December 15, 2026, in each case subject to the reporting person maintaining a continuous Service Relationship (as defined in the 2023 Plan) through each such date.