Jeffrey Cerio

CIK: 0002033618

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)1 (16.7%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)5 (83.3%)

Compensation grants

Other (G, F, J, C, D, …)0 (0.0%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

KRRO

Korro Bio, Inc.

Officer

Discretionary Trading P&L

Holdings

Transaction History (6 total)

KRRO
Korro Bio, Inc.
Jul 15, 2026
Award(A)
Direct
6.5K shares-
KRRO
Korro Bio, Inc.
Jun 16, 2026
Sale(S)
Direct
6.6K shares at avg. $10.83$72K
KRRO
Korro Bio, Inc.
Feb 2, 2026
Award(A)
Stock Option (Right to Buy)
Direct
23K shares-
KRRO
Korro Bio, Inc.
Dec 15, 2025
Award(A)
Direct
41.9K shares-
KRRO
Korro Bio, Inc.
Feb 3, 2025
Award(A)
Stock Option (Right to Buy)
Direct
29K shares-
KRRO
Korro Bio, Inc.
Sep 3, 2024
Award(A)
Stock Option (Right to Buy)
Direct
40K shares-

		Type	Shares	Price		Ownership
Jul 15, 2026	KRRO Korro Bio, Inc.	Award(A)	6,500	-	$0	Direct
Jun 16, 2026	KRRO Korro Bio, Inc.	Sale(S)	6,609	$10.83	$71,575	Direct
Feb 2, 2026	KRRO Korro Bio, Inc.	Award(A) Stock Option (Right to Buy)	23,000	-	-	Direct
Dec 15, 2025	KRRO Korro Bio, Inc.	Award(A)	41,902	-	-	Direct
Feb 3, 2025	KRRO Korro Bio, Inc.	Award(A) Stock Option (Right to Buy)	29,000	-	-	Direct
Sep 3, 2024	KRRO Korro Bio, Inc.	Award(A) Stock Option (Right to Buy)	40,000	-	-	Direct

1-6 of 6 transactions

About Cerio Jeffrey

Cerio Jeffrey (SEC CIK 0002033618) files insider reports with the SEC as General Counsel of Korro Bio, Inc. (KRRO).

Signal8 holds 7 ownership filings by Cerio Jeffrey (1 Form 3, 6 Form 4), filed between Sep 3, 2024 and Jul 17, 2026. Those filings report 6 transactions, from Sep 3, 2024 to Jul 15, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Cerio Jeffrey's filings is in CAMBRIDGE, MA.

Recent filings by Cerio Jeffrey

Jul 15, 2026: Grant or award of KRRO shares (Form 4, code A).
Jun 16, 2026: Open-market sale of KRRO shares (Form 4, code S).
Feb 2, 2026: Grant or award of KRRO derivative securities (Form 4, code A).
Dec 15, 2025: Grant or award of KRRO shares (Form 4, code A).
Feb 3, 2025: Grant or award of KRRO derivative securities (Form 4, code A).

Other insiders filing for Korro Bio, Inc. (KRRO)

Lynx1 Capital Management LP, 10% Owner
FORMELA JEAN FRANCOIS, Director
Dolan Oliver, Senior Vice President, Finance
Aiyar Ram, President and CEO
Vincent Loic A, Chief Scientific Officer
Chappell Todd, Chief Operating Officer

How to read Form 4 transaction codes