KRRO Form 144: Atlas funds report small common stock resales

KRRO notice of proposed sales of Common Stock by affiliated holders under Rule 144.

Rhea-AI Filing Summary

KRRO notice of proposed sales of Common Stock by affiliated holders under Rule 144. The excerpt lists four completed sale entries by Atlas entities with share counts and gross proceeds on 05/28/2026 and 06/22/2026

The filing also references a Private Placement on 03/23/2023 by the issuer for cash and identifies Merrill Lynch at 555 California Street as a listed broker contact.

Insights

Securities Counsel

Rule 144 notice lists small, routine resale transactions by Atlas-affiliated funds.

The excerpt records resale activity in Common Stock with specific sale entries: $34,051.95 for 2,441 shares and $47,178.90 for 3,382 shares on the noted dates. These entries appear as notice-level disclosures rather than issuer actions.

Timing and cash-flow treatment are tied to the listed trade dates 05/28/2026 and 06/22/2026; the filing also cites a prior Private Placement on 03/23/2023. Subsequent filings would show any additional resale activity.

Key Figures

Sale - Atlas Venture Fund XI (05/28/2026): 2,441 shares Sale - Atlas Venture Fund XI (06/22/2026): 3,382 shares Sale - Atlas Venture Opportunity Fund II (05/28/2026): 419 shares +2 more

5 metrics

Sale - Atlas Venture Fund XI (05/28/2026) 2,441 shares sale reported with proceeds <money>$34,051.95</money>

Sale - Atlas Venture Fund XI (06/22/2026) 3,382 shares sale reported with proceeds <money>$47,178.90</money>

Sale - Atlas Venture Opportunity Fund II (05/28/2026) 419 shares sale reported with proceeds <money>$5,845.05</money>

Sale - Atlas Venture Opportunity Fund II (06/22/2026) 580 shares sale reported with proceeds <money>$8,091.00</money>

Private Placement Date 03/23/2023 issuer private placement noted as cash consideration

Key Terms

Rule 144, Private Placement, Selling Stockholder

3 terms

Rule 144 regulatory

"notice of proposed sales of Common Stock by affiliated holders under Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Private Placement financial

"Common Stock | 03/23/2023 | Private Placement | Issuer | Cash"

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.

Selling Stockholder financial

"Atlas Venture Fund XI, L.P. ... Common Stock ... 2441 ... 34051.95"

A selling stockholder is an individual or entity that owns shares of a company's stock and chooses to sell some or all of those shares to others. This often occurs when the owner wants to cash in on their investment or reduce their stake. For investors, understanding who the selling stockholder is can provide insights into potential changes in the company's ownership or market activity.

FAQ

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

What does the KRRO Form 144 notice show about recent sales?

It shows four resale entries by Atlas-affiliated holders with exact amounts: $34,051.95 for 2,441 shares and $47,178.90 for 3,382 shares on 05/28/2026 and 06/22/2026. The filing lists sales and proceeds by holder.

Which entities reported sales in the KRRO excerpt?

The excerpt names Atlas Venture Fund XI, L.P. and Atlas Venture Opportunity Fund II, L.P. as holders. Each is shown with sale dates, share counts, and gross proceeds in the provided lines.

Does the filing show an issuer offering or capital raise for KRRO?

The excerpt references a Private Placement dated 03/23/2023 marked as issued by the issuer for cash. No offering size or proceeds beyond that label are shown in the excerpt.

Who is listed as a broker or contact in the excerpt?

The excerpt lists Merrill Lynch at 555 California Street, 18th Floor, San Francisco, CA 94104, which appears under the securities/broker contact lines in the provided text.

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	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	101579	1411948.1	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	03/23/2023	Private Placement	Issuer			101579	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 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)