STOCK TITAN

Korro Bio (KRRO) director Nessan Bermingham receives 14,677 stock options at $10.59

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

Rhea-AI Filing Summary

Korro Bio, Inc. reported that director Nessan Bermingham received a stock option grant covering 14,677 shares of common stock. The option has an exercise price of $10.59 per share and expires on June 9, 2036. The option vests in full on the earlier of the one-year anniversary of the grant date or the next annual meeting of stockholders, subject to his continued service as a non-employee director.

Positive

  • None.

Negative

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Insider Bermingham Nessan
Role null
Type Security Shares Price Value
Grant/Award Stock Option (Right to Buy) 14,677 $0.00 --
Holdings After Transaction: Stock Option (Right to Buy) — 14,677 shares (Direct, null)
Footnotes (1)
  1. [object Object]
Option grant size 14,677 shares Stock options granted to Nessan Bermingham
Exercise price $10.59 per share Strike price of stock options
Expiration date June 9, 2036 Option term end
Post-transaction derivative holdings 14,677 options Total options held after grant
Stock Option (Right to Buy) financial
"security_title: Stock Option (Right to Buy)"
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.
expiration date financial
"expiration_date: 2036-06-09T00:00:00.000Z"
The expiration date is the deadline after which a financial contract, such as an option or a futures agreement, is no longer valid or can be exercised. It matters to investors because it determines the timeframe during which they can take action or benefit from the contract, similar to how a coupon or a food item has a limited period of usefulness. Once the expiration date passes, the contract loses its value or ability to be used.
non-employee director financial
"subject to continued service as a non-employee director through the applicable vesting date"
stockholders financial
"the date of the next annual meeting of stockholders"
Stockholders are individuals or institutions that own one or more shares of a company, giving them a piece of ownership and certain rights such as voting on key decisions and receiving dividends when paid. For investors this matters because stockholders share in a company’s gains and losses and can influence its direction—think of owning a slice of a business like being a co‑owner of a neighborhood shop: you benefit if it succeeds, and you bear risk if it struggles.
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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*
Bermingham Nessan

(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)
XDirector10% 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)
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
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
Stock Option (Right to Buy)$10.5906/10/2026A14,677 (1)06/09/2036Common Stock14,677$014,677D
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-fact06/11/2026
** 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)