KRRO reports resale activity by selling holders

KRRO notice of proposed resale activity for Common Stock via Form 144.

Rhea-AI Filing Summary

KRRO notice of proposed resale activity for Common Stock via Form 144. The filing lists recent sales by selling holders: Atlas Venture Fund XI, L.P. sold 2,441 shares on 05/28/2026 for $34,051.95 and 3,382 shares on 06/22/2026 for $47,178.90. Atlas Venture Opportunity Fund II, L.P. sold 419 shares on 05/28/2026 for $5,845.05 and 580 shares on 06/22/2026 for $8,091.00. The filing also records a prior private placement dated 04/22/2024.

Insights

Issuer Transactions Analyst

Routine Form 144 reporting of secondary sales by venture funds; primarily administrative disclosure.

The excerpt lists specific resale transactions by two affiliated funds with share counts and gross proceeds for each trade dated 05/28/2026 and 06/22/2026. These entries are transaction-level disclosures rather than an offering registration.

Cash‑flow recipients and broader proceeds treatment are not detailed beyond per‑trade dollar amounts in the excerpt; subsequent filings or broker records would clarify settlement and exact proceeds allocation.

Key Figures

Sale by Atlas Venture Fund XI (May): 2,441 shares Sale by Atlas Venture Fund XI (June): 3,382 shares Sale by Atlas Venture Opportunity Fund II (May): 419 shares +2 more

5 metrics

Sale by Atlas Venture Fund XI (May) 2,441 shares sold on 05/28/2026 for $34,051.95

Sale by Atlas Venture Fund XI (June) 3,382 shares sold on 06/22/2026 for $47,178.90

Sale by Atlas Venture Opportunity Fund II (May) 419 shares sold on 05/28/2026 for $5,845.05

Sale by Atlas Venture Opportunity Fund II (June) 580 shares sold on 06/22/2026 for $8,091.00

Private placement date 04/22/2024 Private Placement recorded in filing

Key Terms

Form 144, Private Placement, Issuer

3 terms

Form 144 regulatory

"144: Securities Sold During The Past 3 Months"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Private Placement financial

"Common Stock | 04/22/2024 | Private Placement"

A private placement is a sale of securities directly to a selected group of investors, typically institutions or accredited investors, instead of through a public offering. It lets a company raise money faster and with fewer regulatory steps; for existing shareholders it matters because the newly issued shares, often sold at a discount, increase the share count and can dilute their ownership.

Issuer regulatory

"Private Placement | Issuer | 04/22/2024 | Cash"

FAQ

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

What does KRRO's Form 144 disclose?

The Form 144 lists proposed and recent resale transactions in KRRO common stock. It shows specific sales by Atlas Venture funds with dates, share counts, and gross dollar amounts for each transaction.

How many shares did Atlas Venture Fund XI sell in June 2026?

Atlas Venture Fund XI sold 3,382 shares on 06/22/2026 for $47,178.90. The filing reports per‑trade share counts and gross proceeds for that date.

Were these shares part of a private placement?

The excerpt references a Private Placement dated 04/22/2024. The Form 144 entries themselves record secondary resale transactions; the placement date is listed separately in the filing excerpt.

Which entities reported sales in the Form 144?

The filing shows sales reported by Atlas Venture Fund XI, L.P. and Atlas Venture Opportunity Fund II, L.P., with specific trade dates, share counts, and gross proceeds for each transaction.

Do the Form 144 entries show net proceeds to the issuer?

The excerpt lists gross proceeds by trade (dollar amounts) but does not state whether the issuer received any proceeds. The filing indicates resale transactions, and issuer cash‑flow treatment is not specified in the excerpt.

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

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Accepted by SEC EDGAR 06/23/2026 - 06:12 PM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001885327
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Korro Bio, Inc.
SEC File Number	001-39062
Address of Issuer	60 First Street 2nd Floor, Suite 250 Cambridge MASSACHUSETTS 02141
Phone	6174681999
Name of Person for Whose Account the Securities are To Be Sold	Atlas Venture Opportunity Fund II, L.P.
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Shareholder

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common Stock	Merrill Lynch 555 California Street 18th Floor San Francisco CA 94104	17426	242221.4	14422571	06/23/2026	Nasdaq

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common Stock	04/22/2024	Private Placement	Issuer			17426	04/22/2024	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Atlas Venture Fund XI, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common Stock	05/28/2026	2441	34051.95
Atlas Venture Fund XI, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common Stock	06/22/2026	3382	47178.9
Atlas Venture Opportunity Fund II, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common Stock	05/28/2026	419	5845.05
Atlas Venture Opportunity Fund II, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common Stock	06/22/2026	580	8091

144: Remarks and Signature

Remarks
Date of Notice	06/23/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	04/08/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	Ommer Chohan
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)