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Korro Bio (KRRO) CEO sale covers tax on performance stock unit

Filing Impact
(High)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

Korro Bio, Inc. director and President & CEO Ram Aiyar reported a disposition of common stock primarily tied to equity compensation. On the reported date, 15,152 shares of common stock were sold at a weighted-average price of $12.98 per share solely to satisfy tax withholding obligations arising from the vesting and settlement of a performance stock unit award. Following this tax-related sale, Aiyar directly held 74,848 shares of common stock, and an additional 4,613 shares were held indirectly through The Ram Aiyar Irrevocable Trust, for which he serves as trustee and disclaims beneficial ownership except for any pecuniary interest. The filing also notes that his holdings include 40,000 shares of common stock issuable upon settlement of a restricted stock unit granted under the company’s 2023 equity plan.

Positive

  • None.

Negative

  • None.
Insider Aiyar Ram
Role President and CEO
Sold 15,152 shs ($197K)
Type Security Shares Price Value
Sale Common Stock 15,152 $12.98 $197K
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 74,848 shares (Direct, null); Common Stock — 4,613 shares (Indirect, Shares are held by The Ram Aiyar Irrevocable Trust.)
Footnotes (1)
  1. Represents the sale of shares of common stock solely to satisfy tax withholding obligations incurred upon vesting and settlement of a performance stock unit. The price reported in Column 4 is a weighted-average price. The shares were sold in multiple transactions at prices ranging from $12.62 to $13.245, inclusive. Full information regarding the number of shares sold at each separate price can be provided to the issuer, any security holder of the issuer or the staff of the Securities and Exchange Commission upon request. Includes 40,000 shares of common stock issuable upon settlement of a restricted stock unit granted under the 2023 Plan as reported on Form 4 dated February 3, 2026. Shares held by The Ram Aiyar Irrevocable Trust, for which the Reporting Person serves as trustee. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose.
Shares sold for tax withholding 15,152 shares Disposition tied to performance stock unit vesting
Weighted-average sale price $12.98 per share Shares sold in multiple transactions between $12.62 and $13.245
Direct holdings after transaction 74,848 shares Common stock directly held by Ram Aiyar following sale
Indirect trust holdings 4,613 shares Held by The Ram Aiyar Irrevocable Trust
RSU-related shares 40,000 shares Common stock issuable upon settlement of a restricted stock unit
performance stock unit financial
"sale of shares of common stock solely to satisfy tax withholding obligations incurred upon vesting and settlement of a performance stock unit"
A performance stock unit is a type of reward companies give to employees, usually managers, that depends on how well the company performs over time. If the company hits specific goals, the employee earns shares of stock, like earning a prize for reaching certain levels in a game. It motivates employees to work hard because their rewards are tied to the company's success.
restricted stock unit financial
"Includes 40,000 shares of common stock issuable upon settlement of a restricted stock unit granted under the 2023 Plan"
A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.
irrevocable trust financial
"Shares held by The Ram Aiyar Irrevocable Trust, for which the Reporting Person serves as trustee"
An irrevocable trust is a legal arrangement where an owner transfers assets into a separate entity managed by a trustee and gives up the power to modify or reclaim those assets. For investors it matters because putting stock or other holdings into such a trust can change who controls and benefits from the assets, affect taxes and creditor protection, and influence how easy it is to sell or value those holdings—like placing valuables in a locked safe overseen by someone else.
weighted-average price financial
"The price reported in Column 4 is a weighted-average price"
pecuniary interest financial
"disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein"
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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*
Aiyar Ram
(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
XOfficer (give title below)Other (specify below)
President and CEO
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
05/29/2026		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 Stock05/29/2026S(1)15,152D$12.98(2)74,848(3)D
Common Stock4,613IShares are held by The Ram Aiyar Irrevocable Trust.(4)
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 the sale of shares of common stock solely to satisfy tax withholding obligations incurred upon vesting and settlement of a performance stock unit.
2. The price reported in Column 4 is a weighted-average price. The shares were sold in multiple transactions at prices ranging from $12.62 to $13.245, inclusive. Full information regarding the number of shares sold at each separate price can be provided to the issuer, any security holder of the issuer or the staff of the Securities and Exchange Commission upon request.
3. Includes 40,000 shares of common stock issuable upon settlement of a restricted stock unit granted under the 2023 Plan as reported on Form 4 dated February 3, 2026.
4. Shares held by The Ram Aiyar Irrevocable Trust, for which the Reporting Person serves as trustee. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose.
/s/ Jeffrey Cerio, Attorney-in-fact06/02/2026
** 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

FAQ

What insider transaction did Korro Bio (KRRO) report for Ram Aiyar?

Korro Bio reported that President & CEO Ram Aiyar had 15,152 common shares sold to cover tax withholding. The sale related to vesting of a performance stock unit, not a discretionary open-market trade, and was reported at a weighted-average price of $12.98 per share.

At what price were the Korro Bio (KRRO) shares sold in this Form 4?

The reported weighted-average sale price was $12.98 per share. Footnotes explain trades occurred in multiple transactions between $12.62 and $13.245 per share, and full trade-level detail is available to the issuer, security holders, or regulators upon request.

How many Korro Bio (KRRO) shares does Ram Aiyar hold after this transaction?

After the tax-related sale, Ram Aiyar directly held 74,848 Korro Bio common shares. He also has 4,613 shares held indirectly through The Ram Aiyar Irrevocable Trust, and the filing notes 40,000 additional shares issuable upon settlement of a restricted stock unit.

Was the Korro Bio (KRRO) insider sale a discretionary trade or for taxes?

The filing states the 15,152 shares were sold solely to satisfy tax withholding obligations from vesting and settlement of a performance stock unit. This indicates a tax-driven disposition tied to equity compensation rather than a discretionary open-market sale decision.

What is the role of The Ram Aiyar Irrevocable Trust in Korro Bio (KRRO) holdings?

The filing shows 4,613 Korro Bio shares held by The Ram Aiyar Irrevocable Trust, where Ram Aiyar serves as trustee. He disclaims beneficial ownership of these securities except for any pecuniary interest, meaning the trust, not Aiyar personally, is the primary holder.

What equity awards are referenced in Ram Aiyar’s Korro Bio (KRRO) Form 4?

The Form 4 references a performance stock unit whose vesting triggered tax withholding and a restricted stock unit. It notes 40,000 Korro Bio common shares are issuable upon settlement of this restricted stock unit granted under the company’s 2023 equity plan.