Rick Yang - 10 Mar 2026 Form 4 Insider Report for Korro Bio, Inc. (KRRO)

Reporting relationship: 10%+ Owner
Issuer ticker: KRRO
Reported as of: 10 Mar 2026
Net transaction value: +$2,300,881
SEC form: 4
Accepted by SEC: 12 Mar 2026, 20:15:16 UTC
Prior SEC filing: 11 Feb 2026
Source filing: View source filing
Reporting owner signature: /s/ Zachary Bambach, attorney-in-fact

Key filing fact

Rick Yang filed Form 4 for Korro Bio, Inc. (KRRO) on 12 Mar 2026.

Key facts

This page summarizes Rick Yang's Form 4 filing for Korro Bio, Inc. (KRRO).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 12 Mar 2026, 20:15.

Change

Previous filing in this sequence was filed on 11 Feb 2026.
Current net transaction value: +$2,300,881.

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 0001851328 Primary reporting owner

Yang Rick

Relationship: 10%+ Owner
Address: 2855 SAND HILL ROAD, MENLO PARK
Signature: /s/ Zachary Bambach, attorney-in-fact
Signature date: 12 Mar 2026

Reported non-derivative transactions

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

KRRO transaction

Common Stock

Purchase

Transaction value: $2,300,881
Shares: +207,100
Change %: +19%
Price: $11.11
Shares after: 1,297,893
Date: 10 Mar 2026
Ownership: See Note 2
Footnotes: F1, F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

KRRO transaction Derivative

Pre-Funded Warrants

Purchase

Transaction value
Shares: +242,945
Change %
Price: $11.11
Shares after: 242,945
Date: 10 Mar 2026
Ownership: See Note 2
Underlying class: Common Stock
Underlying amount: 242,945
Exercise price: $0.001000
Footnotes: F1, F2, F3

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

Additional SEC filing notes

Filing notes and footnotes

Section 16 status

Rick Yang is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may still apply in specific circumstances.

Explanation of responses 3 footnotes

Footnote F1

Acquired from the Issuer on March 10, 2026 pursuant to a Subscription Agreement dated March 9, 2026.

Footnote F2

The Reporting Person is a manager of NEA 17 GP, LLC, which is the sole general partner of NEA Partners 17, L.P. ("NEA Partners 17"). NEA Partners 17 is the sole general partner of New Enterprise Associates 17, L.P. ("NEA 17"), the direct beneficial owner of the securities. The Reporting Person disclaims beneficial ownership within the meaning of Section 16 of the Securities Exchange Act of 1934, as amended, or otherwise of such portion of the securities held by NEA 17 in which the Reporting Person has no pecuniary interest.

Footnote F3

The Pre-Funded Warrants are exercisable at any time after their issuance; provided, however, that the Pre-Funded Warrants may not be exercised to the extent such exercise would cause the number of shares of the Issuer's Common Stock owned by the holder (together with its affiliates and certain other related parties) to exceed 9.99% of the total number of shares of the Issuer's Common Stock immediately after giving effect to such exercise, which percentage may be increased or decreased at the option of the holder upon 61 days' prior notice to the Issuer, not to exceed 19.99%.