Korro Bio director granted 14,677 stock options

Korro Bio, Inc. director Rachel Meyers received a grant of stock options as part of her compensation.

Rhea-AI Filing Summary

Korro Bio, Inc. director Rachel Meyers received a grant of stock options as part of her compensation. The award covers 14,677 options to purchase Common Stock at an exercise price of $10.59 per share, all held directly after the transaction.

These options vest in full on the earlier of the one-year anniversary of the grant date or the company’s next annual meeting of stockholders, provided she continues serving as a non-employee director through that date. The options are scheduled to expire on June 9, 2036, giving a long-dated incentive aligned with the company’s share price performance.

Insider Trade Summary

Grant/Award: 14,677 shares

Grant/Award 1 txn

Insider Meyers Rachel

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (Right to Buy)	14,677	$0.00	$0.00

Holdings After Transaction: Stock Option (Right to Buy) — 14,677 contracts (Direct)

Footnotes (1)

1. F1. The shares subject to the option vest in full on the earlier of (i) the one-year anniversary of the grant date or (ii) the date of the next annual meeting of stockholders, subject to continued service as a non-employee director through the applicable vesting date.

Key Figures

Options granted: 14,677 options Exercise price: $10.59 per share Underlying shares: 14,677 shares +2 more

5 metrics

Options granted 14,677 options Stock Option (Right to Buy) grant to director Rachel Meyers

Exercise price $10.59 per share Exercise price for Korro Bio Common Stock under the option

Underlying shares 14,677 shares Common Stock underlying the option award

Post-grant derivative holdings 14,677 options Total options held following the reported transaction

Option expiration date June 9, 2036 Expiration date for the stock option grant

Key Terms

Stock Option (Right to Buy), non-employee director, annual meeting of stockholders, vest in full, +1 more

5 terms

Stock Option (Right to Buy) financial

"security_title: Stock Option (Right to Buy)"

non-employee director financial

"subject to continued service as a non-employee director through the applicable vesting date"

annual meeting of stockholders financial

"the date of the next annual meeting of stockholders"

vest in full financial

"The shares subject to the option vest in full on the earlier of..."

exercise price financial

"conversion_or_exercise_price: 10.5900"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Korro Bio (KRRO) director Rachel Meyers report in this Form 4?

Rachel Meyers reported receiving a grant of stock options covering 14,677 shares of Korro Bio Common Stock. The options are a compensation award, not an open-market stock purchase or sale, and are held directly in her name following the transaction.

How many Korro Bio (KRRO) stock options did Rachel Meyers receive and at what price?

She received 14,677 stock options to buy Korro Bio Common Stock at an exercise price of $10.59 per share. This means she can purchase up to 14,677 shares at that fixed price once the options are vested and exercisable.

When do Rachel Meyers’ Korro Bio (KRRO) stock options vest?

The options vest in full on the earlier of the one-year anniversary of the grant date or the date of Korro Bio’s next annual stockholder meeting. Vesting is conditioned on her continued service as a non-employee director through the relevant vesting date.

When do Rachel Meyers’ Korro Bio (KRRO) stock options expire?

The stock options are scheduled to expire on June 9, 2036. After that expiration date, she would no longer be able to exercise them to purchase Korro Bio Common Stock at the stated $10.59 exercise price.

Is Rachel Meyers buying or selling Korro Bio (KRRO) shares in this Form 4?

She is not buying or selling shares on the open market in this Form 4. Instead, she received a compensation-related grant of stock options, which gives her the right to buy shares later at a fixed exercise price if she chooses to exercise.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/11/2026 - 06:07 PM EDT Learn about SEC filing dates

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

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Meyers Rachel

(Last) (First) (Middle)

C/O KORRO BIO, INC.

60 FIRST STREET, 2ND FLOOR, SUITE 250

(Street)

CAMBRIDGE MASSACHUSETTS 02141

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/10/2026

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

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

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

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

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
Stock Option (Right to Buy)	$10.59	06/10/2026		A		14,677		(1)	06/09/2036	Common Stock	14,677	$0	14,677	D

Explanation of Responses:

1. The shares subject to the option vest in full on the earlier of (i) the one-year anniversary of the grant date or (ii) the date of the next annual meeting of stockholders, subject to continued service as a non-employee director through the applicable vesting date.

	/s/ Jeffrey Cerio, attorney-in-fact	06/11/2026
	** 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)