Atlas Venture affiliates sell blocks of KRRO stock (KRRO)

Rhea-AI Filing Summary

KRRO files a Form 144 notice reporting recent dispositions of Common Stock by Atlas Venture affiliates. The filing lists multiple sales over late May–early July 2026, including large block sales by Atlas Venture Fund XI, L.P.

Examples shown include sales of 101,579 shares for $1,447,785.17 on 06/23/2026 and 85,955 shares for $1,206,249.49 on 07/02/2026. The notice also shows earlier private placement activity dated 04/22/2024.

Insights

Securities Compliance Attorney

Form 144 records proposed or completed sales by affiliates; it is a disclosure, not an issuer action.

Form 144 is a seller notice under the Securities Act used when affiliates/insiders plan to sell restricted or control securities. The filing lists dates, share counts, and gross proceeds for each reported sale by Atlas Venture entities.

Timing and cash‑flow treatment are shown per transaction lines; further SEC or issuer filings would be required to determine any broader corporate impact. Subsequent filings may disclose additional transactions or clarifying facts.

Key Figures

Sale - 06/23/2026: 101,579 shares Proceeds - 06/23/2026: $1,447,785.17 Sale - 07/02/2026: 85,955 shares +3 more

6 metrics

Sale - 06/23/2026 101,579 shares Sale by Atlas Venture Fund XI, L.P. on 06/23/2026

Proceeds - 06/23/2026 $1,447,785.17 Gross proceeds reported for 101,579 shares on 06/23/2026

Sale - 07/02/2026 85,955 shares Sale by Atlas Venture Fund XI, L.P. on 07/02/2026

Proceeds - 07/02/2026 $1,206,249.49 Gross proceeds reported for 85,955 shares on 07/02/2026

Private Placement date 04/22/2024 Securities sold noted as Private Placement dated 04/22/2024

Smaller sale - 06/24/2026 41,345 shares Sale by Atlas Venture Fund XI, L.P. on 06/24/2026 for $603,694.88

Key Terms

Form 144, Private Placement, Issuer, Common Stock

4 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 market

"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 legal

"Private Placement | Issuer"

Common Stock financial

"Securities To Be Sold | Common Stock"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

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Available on EDGAR 07/06/2026 - 05:16 PM Accepted by SEC EDGAR 07/06/2026 - 05:15 PM Learn about SEC filing dates

FAQ

What does KRRO's Form 144 show about Atlas Venture sales?

The Form 144 lists multiple sales by Atlas Venture affiliates, including 101,579 shares for $1,447,785.17 on 06/23/2026. It provides transaction dates, share counts, and gross proceeds for each line item.

Does the Form 144 indicate these were open‑market trades or private placements?

The filing shows a Private Placement dated 04/22/2024 and separate sales in 2026. Each line identifies the security type and sale date; the method for each 2026 sale is given as transaction lines in the table.

Which Atlas Venture entity reported the largest sale in the excerpt?

Atlas Venture Fund XI, L.P. reported the largest single line shown: 101,579 shares sold for $1,447,785.17 on 06/23/2026, as listed in the filing excerpt.

Are proceeds recipients or issuer proceeds specified in the Form 144 excerpt?

The excerpt lists gross proceeds per sale line (e.g., $1,447,785.17) but does not state who received proceeds or how proceeds were used in the provided lines.

Does this Form 144 change KRRO's outstanding share count or registration status?

The excerpt documents sales by selling holders; it does not state shares outstanding or any change to registration status in the provided text.

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	8506	119084	14422571	07/06/2026	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			8506	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 Fund XI, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common Stock	06/23/2026	101579	1447785.17
Atlas Venture Fund XI, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common Stock	06/24/2026	41345	603694.88
Atlas Venture Fund XI, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common Stock	07/02/2026	85955	1206249.49
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
Atlas Venture Opportunity Fund II, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common Stock	06/24/2026	7093	103567.73
Atlas Venture Opportunity Fund II, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common Stock	07/02/2026	14745	206923.96

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)