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Korro Bio (KRRO) grants 6,500 RSUs to General Counsel Jeffrey Cerio

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Cerio Jeffrey reported acquisition or exercise transactions in this Form 4 filing.

Korro Bio, Inc. reported that General Counsel Jeffrey Cerio received a grant of 6,500 shares of common stock in the form of restricted stock units (RSUs) under the 2023 Stock Option and Incentive Plan on July 15, 2026, at a stated price of $0.0000 per share. These RSUs will vest 50% on July 15, 2027 and 50% on July 15, 2028, subject to maintaining a continuous Service Relationship. Following this award, Cerio holds 41,793 shares directly, including 27,451 unvested RSUs scheduled to vest in tranches on December 15, 2026 and July 15 of 2027 and 2028.

Positive

  • None.

Negative

  • None.
Insider Cerio Jeffrey
Role General Counsel
Type Security Shares Price Value
Grant/Award Common Stock 6,500 $0.00 --
Holdings After Transaction: Common Stock — 41,793 shares (Direct)
Footnotes (1)
  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. Includes 27,451 shares of common stock issuable upon settlement of restricted stock units (RSUs) that remain unvested, consisting of 20,951 shares that will vest on December 15, 2026, 3,250 shares that will vest on July 15, 2027, and 3,250 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.
RSUs Granted 6,500 shares Restricted stock units of common stock granted on July 15, 2026
Grant Price $0.0000 per share Stated transaction price for the RSU award
Shares After Transaction 41,793 shares Direct holdings following the RSU grant
Unvested RSUs Included 27,451 shares Unvested RSUs included in post-transaction holdings
RSUs Vesting 12/15/2026 20,951 shares Portion of unvested RSUs scheduled to vest on December 15, 2026
RSUs Vesting 7/15/2027 3,250 shares Unvested RSUs scheduled to vest on July 15, 2027
RSUs Vesting 7/15/2028 3,250 shares Unvested RSUs scheduled to vest on July 15, 2028
restricted stock unit (RSU) financial
"Represents shares of common stock issuable upon settlement of a restricted stock unit (RSU)"
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.
Service Relationship financial
"subject to the reporting person maintaining a continuous Service Relationship"
2023 Stock Option and Incentive Plan financial
"RSU granted under the Issuer's 2023 Stock Option and Incentive Plan"

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Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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*
Cerio Jeffrey
(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)
Director10% Owner
XOfficer (give title below)Other (specify below)
General Counsel
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
07/15/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock07/15/2026A6,500(1)A$0.0041,793(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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount 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 27,451 shares of common stock issuable upon settlement of restricted stock units (RSUs) that remain unvested, consisting of 20,951 shares that will vest on December 15, 2026, 3,250 shares that will vest on July 15, 2027, and 3,250 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 Cerio07/17/2026
** Signature of Reporting PersonDate
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)

Source: View Original Filing on SEC EDGAR