Atlas Venture (KRRO) files multiple Rule 144 notices listing June 2026 sales

Rhea-AI Filing Summary

Atlas Venture affiliates reported proposed sales of Common Stock of KRRO under Rule 144. The filing lists multiple sale notices in late May and June 2026, including a 101,579-share notice for $1,447,785.17 on 06/23/2026 and other listed transactions on 05/28/2026, 06/22/2026, and 06/24/2026.

Insights

Securities Compliance Counsel

Rule 144 notices record planned resale of restricted common stock by venture funds.

The filing lists multiple proposed disposals by Atlas Venture Fund XI, L.P. and Atlas Venture Opportunity Fund II, L.P. with explicit share counts and proceeds for several dates in May–June 2026.

These notices are procedural and describe transferees and cash consideration; subsequent SEC filings or broker confirmations will show actual settlement and timing.

Key Figures

Form type: Form 144 Sale example: 101,579 shares Proceeds example: $1,447,785.17 +2 more

5 metrics

Form type Form 144 Rule 144 resale notice

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

Proceeds example $1,447,785.17 proceeds associated with 101,579-share entry on 06/23/2026

Other sale 41,345 shares sale listed on 06/24/2026 by Atlas Venture Fund XI, L.P.

Private placement origin private placement on 04/22/2024 securities originally issued in a private placement

Key Terms

Form 144, Private Placement, Restricted securities

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.

Restricted securities regulatory

"Private Placement | Issuer | Cash"

Restricted securities are shares or other investment instruments that come with legal or contractual limits on when and how they can be sold, like stock given to founders or bought in a private offering. Think of them as assets in a locked box that can’t be freely traded until certain conditions — such as a waiting period, company registration, or specific approvals — are met. For investors this matters because restricted securities are less liquid and can affect timing, price, and perceived value when they eventually enter the market.

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Available on EDGAR 07/02/2026 - 04:42 PM Accepted by SEC EDGAR 07/02/2026 - 04:41 PM Learn about SEC filing dates

FAQ

Who filed the Rule 144 notices for KRRO?

The notices were filed by Atlas Venture Fund XI, L.P. and Atlas Venture Opportunity Fund II, L.P. listing proposed sales of KRRO common stock, with specific dates and share counts reported in the filing.

What share amounts and proceeds are shown for KRRO in June 2026?

The filing shows a 101,579-share item on 06/23/2026 with $1,447,785.17, plus additional entries on 06/22/2026 and 06/24/2026 with listed share counts and proceeds.

What type of securities are being sold in the KRRO filing?

The filing lists Common Stock as the security type for the reported transactions, including private placement origin and subsequent sale notices in the excerpt.

Were the past three months' sales executed for KRRO or proposed?

The document records reported sales and proposed notices over the past three months, with individual executed-sale entries showing share counts and cash consideration on specific May–June 2026 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
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	14745	201269.25	14422571	07/02/2026	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			14745	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 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

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)