Ram Aiyar - 04 Aug 2026 Form 4 Insider Report for Korro Bio, Inc. (KRRO)

Reporting relationship: President and CEO, Director
Issuer ticker: KRRO
Reported as of: 04 Aug 2026
Net transaction value: -$62,917
SEC form: 4
Accepted by SEC: 05 Aug 2026, 16:05:09 UTC
Prior SEC filing: 02 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Jeffrey Cerio, Attorney-in-fact

Key filing fact

Ram Aiyar filed Form 4 for Korro Bio, Inc. (KRRO) on 05 Aug 2026.

Key facts

This page summarizes Ram Aiyar's Form 4 filing for Korro Bio, Inc. (KRRO).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 05 Aug 2026, 16:05.

Change

Previous filing in this sequence was filed on 02 Jun 2026.
Current net transaction value: -$62,917.

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

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001997920 Primary reporting owner

Aiyar Ram

Relationship: President and CEO, Director
Address: C/O KORRO BIO, INC., 60 FIRST STREET, 2ND FLOOR, SUITE 250, CAMBRIDGE
Signature: /s/ Jeffrey Cerio, Attorney-in-fact
Signature date: 05 Aug 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

KRRO transaction

Common Stock

Sale

Transaction value: $62,917
Shares: -5,802
Change %: -7.8%
Price: $10.84
Shares after: 69,046
Date: 04 Aug 2026
Ownership: Direct
Footnotes: F1, F2, F3

KRRO holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 4,613
Date: 04 Aug 2026
Ownership: Shares are held by The Ram Aiyar Irrevocable Trust.
Footnotes: F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

Represents the mandatory sale of shares of common stock solely to satisfy tax withholding obligations incurred upon vesting and settlement of a restricted stock unit (RSU) granted under the Issuer's 2023 Stock Option and Incentive Plan (the 2023 Plan).

Footnote F2

The price reported in Column 4 is a weighted-average price. The shares were sold in multiple transactions at prices ranging from $10.57 to $11.055, inclusive. Full information regarding the number of shares sold at each separate price can be provided to the issuer, any security holder of the issuer or the staff of the Securities and Exchange Commission upon request.

Footnote F3

Includes 20,000 shares of common stock issuable upon settlement of a RSU granted under the 2023 Plan that will vest on February 1, 2027 subject to the reporting person maintaining a continuous Service Relationship (as defined in the 2023 Plan) through such date.

Footnote F4

Shares held by The Ram Aiyar Irrevocable Trust, for which the Reporting Person serves as trustee. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose.