KRRO Form 144: Atlas Venture sells 101,579 shares

KRRO reported proposed and recent sales of Common Stock by affiliated holders via Form 144 filings.

Rhea-AI Filing Summary

KRRO reported proposed and recent sales of Common Stock by affiliated holders via Form 144 filings. The excerpt lists multiple sales by Atlas Venture entities, including a sale of 101,579 shares on 06/23/2026 for $1,447,785.17.

Other dated dispositions by Atlas Venture Fund XI and Atlas Venture Opportunity Fund II are shown between 05/28/2026 and 06/23/2026.

Insights

Securities Counsel

Form 144 disclosures list scheduled sales by Atlas Venture affiliates; transaction dates and amounts are provided.

These entries are notices of proposed or completed dispositions of Common Stock by affiliated investment funds. The filing lists specific sale dates, share counts, and gross proceeds amounts for each transaction, which is typical for Section 16 reporting of restricted or control stock.

Cash‑flow treatment and any resale restrictions are not detailed in the excerpt; subsequent SEC filings or broker confirmations would clarify settlement and compliance with resale conditions.

Key Figures

Largest listed sale: 101,579 shares Proceeds from largest sale: $1,447,785.17 Sample sale: 3,382 shares +3 more

6 metrics

Largest listed sale 101,579 shares sale date <date>06/23/2026</date>

Proceeds from largest sale $1,447,785.17 sale date <date>06/23/2026</date>

Sample sale 3,382 shares sale date <date>06/22/2026</date>

Proceeds for 3,382-share sale $47,178.90 sale date <date>06/22/2026</date>

Other reported sale 17,426 shares sale date <date>06/23/2026</date>

Proceeds for 17,426-share entry $248,369.29 sale date <date>06/23/2026</date>

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 | 03/23/2023 | 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 financial

"Private Placement | Issuer"

FAQ

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

What sales does KRRO Form 144 disclose for Atlas Venture entities?

The filing shows multiple sales by Atlas Venture affiliates, including 101,579 shares on 06/23/2026 for $1,447,785.17. It also lists smaller sales on 05/28/2026 and 06/22/2026 with share counts and gross proceeds.

Which Atlas Venture entities are named in the KRRO excerpt?

The excerpt names Atlas Venture Fund XI, L.P. and Atlas Venture Opportunity Fund II, L.P., each with addresses at 300 Technology Sq Ste 8, Cambridge, MA, and multiple dated sales shown in the table of transactions.

What are the largest and sample sale amounts reported?

A largest listed sale is 101,579 shares on 06/23/2026 for $1,447,785.17. Sample earlier entries include 3,382 shares for $47,178.90 and 1,746 shares for $248,369.29 as shown.

Do these Form 144 entries indicate who received proceeds or resale conditions?

The excerpt lists sale dates, share counts, and gross amounts but does not state who received proceeds or specific resale restrictions. Cash‑flow treatment and any transfer conditions are not provided in the visible content.

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

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Accepted by SEC EDGAR 06/24/2026 - 05:50 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	0001708269
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 Fund XI, 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	41345	566839.95	14422571	06/24/2026	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	03/23/2023	Private Placement	Issuer			41345	03/23/2023	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 Fund XI, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common Stock	06/23/2026	101579	1447785.17
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
Atlas Venture Opportunity Fund II, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common Stock	06/23/2026	17426	248369.29

144: Remarks and Signature

Remarks
Date of Notice	06/24/2026
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)