Korro Bio (KRRO) holder adds shares, pre-funded warrants in March buy

Rhea-AI Filing Summary

SANDELL SCOTT D reported open-market purchase transactions in this Form 4 filing.

Korro Bio, Inc. insider entities linked to Scott D. Sandell indirectly acquired 242,945 Pre-Funded Warrants and 207,100 shares of Common Stock on March 10, 2026, pursuant to a Subscription Agreement dated March 9, 2026.

The Pre-Funded Warrants carry a $0.001 exercise price and are exercisable at any time, subject to a 9.99% ownership cap that can be adjusted up to 19.99% with 61 days’ notice.

Insider Trade Summary

Net Buyer: 450,045 shares ($4,999,757)

Net Buy 2 txns

Insider SANDELL SCOTT D

Role 10% Owner

Bought 450,045 shs ($5.00M)

Type	Security	Shares	Price	Value
Purchase	Pre-Funded Warrants	242,945	$11.109	$2.70M
Purchase	Common Stock	207,100	$11.11	$2.30M

Holdings After Transaction: Pre-Funded Warrants — 242,945 shares (Indirect, See Note 2); Common Stock — 1,297,893 shares (Indirect, See Note 2)

Footnotes (1)

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

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

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X

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

SANDELL SCOTT D

(Last) (First) (Middle)

1954 GREENSPRING DRIVE

SUITE 600

(Street)

TIMONIUM MD 21093

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Korro Bio, Inc. [ KRRO ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
03/10/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/10/2026		P(1)		207,100	A	$11.11	1,297,893	I	See Note 2(2)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Pre-Funded Warrants	$0.001	03/10/2026		P(1)		242,945		(3)	(3)	Common Stock	242,945	$11.109	242,945	I	See Note 2(2)

Explanation of Responses:

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

2. 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.

3. 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%.

	/s/ Zachary Bambach, attorney-in-fact	03/12/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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FAQ

What insider transactions did Korro Bio (KRRO) report in this Form 4?

Korro Bio reported that entities associated with Scott D. Sandell bought 242,945 Pre-Funded Warrants and 207,100 shares of Common Stock on March 10, 2026, increasing their indirect position in the company.

At what prices were Korro Bio (KRRO) securities acquired in the March 10, 2026 transactions?

The reporting entities acquired 242,945 Pre-Funded Warrants and 207,100 shares of Korro Bio Common Stock at purchase prices of about $11.109 and $11.110 per security, respectively, under a Subscription Agreement with the company.

Who is the direct beneficial owner of the Korro Bio (KRRO) securities in this Form 4?

The direct beneficial owner is New Enterprise Associates 17, L.P. (NEA 17). Scott D. Sandell is a manager of entities that control NEA 17 and disclaims beneficial ownership of portions where he has no pecuniary interest.

How many Korro Bio (KRRO) shares are held after the Form 4 transactions?

Following the March 10, 2026 purchases, the indirect holdings reported include 1,297,893 shares of Korro Bio Common Stock, plus 242,945 Pre-Funded Warrants that are exercisable into an equal number of Common Stock shares, subject to ownership limits.

What are the key terms of the Korro Bio (KRRO) Pre-Funded Warrants purchased?

The Pre-Funded Warrants have a $0.001 exercise price and are exercisable at any time, but cannot be exercised if doing so would push ownership above 9.99%, a cap that can be raised to as high as 19.99% with 61 days’ notice.

How is Scott D. Sandell related to the Korro Bio (KRRO) Form 4 holdings?

Scott D. Sandell is a manager of NEA 17 GP, LLC, which ultimately controls NEA 17, the direct beneficial owner. He reports the transactions but disclaims beneficial ownership of securities in which he has no pecuniary interest.