Key facts
- This page summarizes Jeffrey Cerio's Form 4 filing for Korro Bio, Inc. (KRRO).
- 1 reported transaction and 1 derivative row are listed below.
- Accepted by SEC: 03 Feb 2026, 16:08.
Jeffrey Cerio - 02 Feb 2026 Form 4 Insider Report for Korro Bio, Inc. (KRRO)
- Reporting relationship
- General Counsel
- Issuer ticker
- KRRO
- Reported as of
- 02 Feb 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 03 Feb 2026, 16:08:03 UTC
- Prior SEC filing
- 16 Dec 2025
- Next SEC filing
- 17 Jun 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Jeffrey Cerio
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Jeffrey Cerio filed Form 4 for Korro Bio, Inc. (KRRO) on 03 Feb 2026.
Change
- Previous filing in this sequence was filed on 16 Dec 2025.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0002033618
Primary reporting owner
Cerio Jeffrey
- Relationship
- General Counsel
- Address
- C/O KORRO BIO, INC., 60 FIRST STREET, 2ND FLOOR, SUITE 250, CAMBRIDGE
- Signature
- /s/ Jeffrey Cerio
- Signature date
- 03 Feb 2026
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
KRRO
transaction
Derivative
Stock Option (Right to Buy)
Award
- Transaction value
- $0
- Shares
- +23,000
- Change %
- Price
- $0.000000
- Shares after
- 23,000
- Date
- 02 Feb 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 23,000
- Exercise price
- $13.05
- Footnotes
- F1
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 1 footnote
Footnote 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.