KRRO proposes sale of 3,661 shares on Nasdaq (NASDAQ: KRRO); Atlas Venture recent disposals

Rhea-AI Filing Summary

KRRO reports a proposed resale of 3,661 shares of Common Stock under a Form 144, with the notice dated 06/22/2026 and the securities listed for sale on Nasdaq. The filing notes these shares were originally issued in a Private Placement on 04/22/2024.

The excerpt also discloses recent dispositions: Atlas Venture Fund XI, L.P. sold 2,441 shares on 05/28/2026 for $34,051.95, and Atlas Venture Opportunity Fund II, L.P. sold 419 shares on 05/28/2026 for $5,845.05.

Insights

Securities Compliance Analyst

Routine Form 144 notice reporting a proposed resale of issuer-placed shares.

The filing lists a proposed sale of 3,661 shares of Common Stock that were issued in a Private Placement on 04/22/2024.

Recent executed dispositions by related holders—2,441 shares and 419 shares on 05/28/2026—are recorded with proceeds of $34,051.95 and $5,845.05. Timing and methods for future sales are not detailed in the excerpt.

Key Figures

Proposed resale: 3,661 shares Private placement date: 04/22/2024 Recent sale — Atlas Venture Fund XI: 2,441 shares +2 more

5 metrics

Proposed resale 3,661 shares proposed sale listed on Form 144 dated 06/22/2026

Private placement date 04/22/2024 original issuance date for the shares to be resold

Recent sale — Atlas Venture Fund XI 2,441 shares sold on 05/28/2026 for <money>$34,051.95</money>

Recent sale — Atlas Venture Opportunity Fund II 419 shares sold on 05/28/2026 for <money>$5,845.05</money>

Form notice date 06/22/2026 date associated with the Form 144 excerpt

Key Terms

Form 144, Private Placement, Proposed resale, Nasdaq

4 terms

Form 144 regulatory

"Proposed resale of 3,661 shares under a Form 144 dated 06/22/2026"

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

"Securities issued in a Private Placement on 04/22/2024"

A private placement is a way for companies to raise money by selling securities directly to a small group of investors instead of through a public offering. This process is often quicker and less regulated, making it similar to offering a special, exclusive investment opportunity to select individuals or institutions. For investors, it can provide access to unique investment options that are not available on public markets.

Proposed resale regulatory

"Securities To Be Sold — Common Stock — Proposed resale of 3,661 shares"

Nasdaq market

"Listing market indicated as Nasdaq in the Form 144 excerpt"

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.

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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	3661	47556.39	14422571	06/22/2026	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			3661	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 Opportunity Fund II, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common Stock	05/28/2026	419	5845.05

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)

FAQ

What does KRRO's Form 144 filing mean for shareholders?

It notifies the SEC of an intended resale of restricted shares. The filing shows 3,661 shares tied to a 04/22/2024 private placement and lists prior sales by related holders on 05/28/2026.

How many KRRO shares are proposed for sale per the filing?

The filing shows a proposed sale of 3,661 shares. These shares were issued in a Private Placement on 04/22/2024 and are reported on the Form 144 dated 06/22/2026.

Who sold shares of KRRO in the past three months listed in the filing?

Atlas Venture-related funds recorded sales on 05/28/2026. Atlas Venture Fund XI, L.P. sold 2,441 shares for $34,051.95; Atlas Venture Opportunity Fund II, L.P. sold 419 shares for $5,845.05.

Were the proposed KRRO shares originally issued in a public offering?

No — the shares were issued in a private placement. The Form 144 entry labels the securities as from a Private Placement dated 04/22/2024 and lists the intended resale on 06/22/2026.

On which exchange are the KRRO shares listed for resale?

The filing lists Nasdaq as the market for the resale. The Form 144 excerpt includes Nasdaq alongside the notice dated 06/22/2026 and the proposed 3,661-share sale.