Korro Bio grants 7,500 RSUs to COO Chappell

Chappell Todd reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Chappell Todd reported acquisition or exercise transactions in this Form 4 filing.

Korro Bio, Inc. reported that Chief Operating Officer Todd Chappell received a grant of restricted stock units representing 7,500 shares of common stock under its 2023 Stock Option and Incentive Plan. These RSUs vest 50% on July 15, 2027 and 50% on July 15, 2028, subject to a continuous Service Relationship.

After this award, Chappell beneficially owns 24,464 shares of common stock, including 17,566 shares underlying unvested RSUs scheduled to vest in 2026, 2027 and 2028.

Insider Trade Summary

Grant/Award: 7,500 shares

Grant/Award 1 txn

Insider Chappell Todd

Role Chief Operating Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F1, F2	7,500	$0.00	$0.00

Holdings After Transaction: Common Stock — 24,464 shares (Direct)

Footnotes (2)

1. F1. Represents shares of common stock issuable upon settlement of a restricted stock unit (RSU) granted under the Issuer's 2023 Stock Option and Incentive Plan (the 2023 Plan) that will vest as follows: 50% on July 15, 2027 and 50% on July 15, 2028, in each case subject to the reporting person maintaining a continuous Service Relationship (as defined in the 2023 Plan) through each such date.
2. F2. Includes 17,566 shares of common stock issuable upon settlement of restricted stock units (RSUs) that remain unvested, consisting of 10,066 shares that will vest on December 15, 2026, 3,750 shares that will vest on July 15, 2027, and 3,750 shares that will vest on July 15, 2028, in each case subject to the reporting person maintaining a continuous Service Relationship (as defined in the 2023 Plan) through each such date.

Key Figures

RSUs granted: 7,500 shares Shares owned after grant: 24,464 shares Unvested RSU-linked shares: 17,566 shares +3 more

6 metrics

RSUs granted 7,500 shares Restricted stock units granted to COO Todd Chappell on July 15, 2026

Shares owned after grant 24,464 shares Amount of Korro Bio common stock beneficially owned following the reported transaction

Unvested RSU-linked shares 17,566 shares Shares of common stock issuable upon settlement of unvested RSUs included in post-transaction holdings

RSUs vesting 12/15/2026 10,066 shares Portion of unvested RSUs scheduled to vest on December 15, 2026

RSUs vesting 07/15/2027 3,750 shares Unvested RSUs scheduled to vest on July 15, 2027

RSUs vesting 07/15/2028 3,750 shares Unvested RSUs scheduled to vest on July 15, 2028

Key Terms

restricted stock unit (RSU), 2023 Stock Option and Incentive Plan, Service Relationship

3 terms

restricted stock unit (RSU) financial

"common stock issuable upon settlement of a restricted stock unit (RSU) granted under the 2023 Plan"

A restricted stock unit (RSU) is a promise from a company to give an employee company shares (or cash equal to their value) at a future date if certain conditions are met, such as staying with the company or hitting performance targets. For investors, RSUs matter because when they convert into actual shares they increase the number of shares available and can create selling pressure as employees cash out—think of them as a future paycheck paid in company stock.

2023 Stock Option and Incentive Plan financial

"granted under the Issuer's 2023 Stock Option and Incentive Plan (the 2023 Plan)"

Service Relationship financial

"subject to the reporting person maintaining a continuous Service Relationship through each such date"

FAQ

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

What insider equity award did Korro Bio (KRRO) grant to Todd Chappell?

Korro Bio granted Chief Operating Officer Todd Chappell 7,500 restricted stock units (RSUs) representing common stock. The RSUs were issued under the 2023 Stock Option and Incentive Plan and vest in two equal installments in 2027 and 2028, contingent on continued service.

When will Todd Chappell's 7,500 RSUs at Korro Bio (KRRO) vest?

Chappell’s 7,500 RSUs vest in two tranches: 50% on July 15, 2027 and 50% on July 15, 2028. Each vesting date requires him to maintain a continuous Service Relationship as defined in Korro Bio’s 2023 Stock Option and Incentive Plan.

How many Korro Bio (KRRO) shares does Todd Chappell own after this transaction?

Following the RSU grant, Todd Chappell beneficially owns 24,464 shares of Korro Bio common stock. This total includes 17,566 shares underlying unvested RSUs that are scheduled to vest over several dates in 2026, 2027 and 2028, subject to continued service.

How many unvested RSUs does Todd Chappell hold in Korro Bio (KRRO) and what is their vesting schedule?

Chappell holds 17,566 unvested RSU-linked shares. Of these, 10,066 vest on December 15, 2026, 3,750 vest on July 15, 2027, and another 3,750 vest on July 15, 2028, all subject to a continuous Service Relationship.

Was Todd Chappell’s Korro Bio (KRRO) equity grant made under a Rule 10b5-1 trading plan?

The filing’s Rule 10b5-1 checkbox is not marked, indicating this RSU award is not reported as made under a Rule 10b5-1 trading plan. It is reported as an RSU grant under Korro Bio’s 2023 Stock Option and Incentive Plan.

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

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Available on EDGAR 07/17/2026 - 07:05 AM Accepted by SEC EDGAR 07/17/2026 - 07:05 AM 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^*

Chappell Todd

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/15/2026

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
Common Stock	07/15/2026		A		7,500(1)	A	$0.00	24,464(2)	D

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

Explanation of Responses:

1. Represents shares of common stock issuable upon settlement of a restricted stock unit (RSU) granted under the Issuer's 2023 Stock Option and Incentive Plan (the 2023 Plan) that will vest as follows: 50% on July 15, 2027 and 50% on July 15, 2028, in each case subject to the reporting person maintaining a continuous Service Relationship (as defined in the 2023 Plan) through each such date.

2. Includes 17,566 shares of common stock issuable upon settlement of restricted stock units (RSUs) that remain unvested, consisting of 10,066 shares that will vest on December 15, 2026, 3,750 shares that will vest on July 15, 2027, and 3,750 shares that will vest on July 15, 2028, in each case subject to the reporting person maintaining a continuous Service Relationship (as defined in the 2023 Plan) through each such date.

	/s/ Jeffrey Cerio, Attorney-in-fact	07/17/2026
	** 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)