Atlas Venture funds sell KRRO (KRRO) shares in recent stock transactions

Rhea-AI Filing Summary

KRRO common stock holders filed to sell shares under a resale notice. The planned transaction lists 1,775 shares of common stock to be sold through Merrill Lynch on Nasdaq. Atlas Venture Fund XI, L.P. and Atlas Venture Opportunity Fund II, L.P. also report multiple prior common stock sales over the past three months with varying sizes and proceeds.

Key Figures

Planned shares to be sold: 1,775 shares Planned sale value: $23,944.75 Largest single recent sale: 101,579 shares +3 more

6 metrics

Planned shares to be sold 1,775 shares KRRO common stock to be sold through Merrill Lynch on Nasdaq

Planned sale value $23,944.75 Associated value for 1,775 KRRO common shares in the planned sale

Largest single recent sale 101,579 shares KRRO common stock sold by Atlas Venture Fund XI, L.P. on 06/23/2026

Proceeds from largest single sale $1,447,785.17 Total proceeds for 101,579 KRRO shares sold on 06/23/2026

Sale on 07/02/2026 by Atlas Venture Fund XI, L.P. 85,955 shares; $1,206,249.49 KRRO common stock sale and proceeds

Sale on 06/23/2026 by Opportunity Fund II 17,426 shares; $248,369.29 KRRO common stock sale and proceeds

Key Terms

Private Placement, Common Stock, Nasdaq, cash, +1 more

5 terms

Private Placement financial

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

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.

Common Stock financial

"Common Stock | Merrill Lynch 555 California Street 18th Floor"

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.

Nasdaq market

"14725646 | 08/11/2026 | Nasdaq"

The Nasdaq is a stock exchange where many companies' shares are bought and sold, functioning much like a marketplace for investments. It matters to investors because it provides a platform to buy and sell ownership stakes in companies, helping them track the value of those companies and make informed decisions. As one of the largest and most technology-focused markets, it also reflects trends and developments in the business world.

cash financial

"03/23/2023 | Cash"

Securities Sold During The Past 3 Months regulatory

"144: Securities Sold During The Past 3 Months"

FAQ

What does the KRRO Form 144-related filing disclose?

It discloses a planned sale of 1,775 shares of KRRO common stock through Merrill Lynch on Nasdaq and lists multiple prior common stock sales by Atlas Venture funds over the past three months, including share counts, dates and dollar proceeds.

How many KRRO shares are planned to be sold in this notice for KRRO?

The notice lists a planned sale of 1,775 shares of KRRO common stock. The filing also provides an associated value of $23,944.75 for these shares and notes that the transaction is to be executed through Merrill Lynch on Nasdaq.

Which entities are selling KRRO common stock in the recent KRRO transactions?

The filing identifies Atlas Venture Fund XI, L.P. and Atlas Venture Opportunity Fund II, L.P. as selling holders of KRRO common stock, each reporting multiple sale transactions with specific dates, share amounts and total dollar proceeds over the past three months.

What is the largest single KRRO stock sale reported for KRRO in the past three months?

The largest single reported transaction is by Atlas Venture Fund XI, L.P., which sold 101,579 shares of KRRO common stock on 06/23/2026 for total proceeds of $1,447,785.17, according to the disclosed transaction list.

How much KRRO stock did Atlas Venture Opportunity Fund II, L.P. sell according to the KRRO filing?

Individual transactions by Atlas Venture Opportunity Fund II, L.P. include sales such as 17,426 shares for $248,369.29 on 06/23/2026 and 14,745 shares for $206,923.96 on 07/02/2026, along with several smaller sales on nearby dates.

What was the consideration for the original KRRO common stock issuance mentioned for KRRO?

The securities section notes that the KRRO common stock was issued on 03/23/2023 in a Private Placement by the issuer for cash. This context explains how the securities being sold were originally acquired.

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

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Available on EDGAR 08/11/2026 - 06:01 PM Accepted by SEC EDGAR 08/11/2026 - 06:00 PM 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
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	1775	23944.75	14725646	08/11/2026	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			1775	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 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 Fund XI, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common Stock	07/06/2026	817	11405.24
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
Atlas Venture Opportunity Fund II, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common Stock	07/06/2026	8506	118742.91

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)