Atlas Venture sells KRRO (KRRO) stock — 2,441 and 419 shares reported

Rhea-AI Filing Summary

KRRO filed a Form 144 reporting proposed sales of Common Stock. The filing lists sales by institutional holders including Atlas Venture Fund XI: 2,441 shares for $34,051.95 and Atlas Venture Opportunity Fund II: 419 shares for $5,845.05, each dated 05/28/2026. The filing also references a private placement dated 03/23/2023.

Insights

Securities Counsel

Routine Form 144 resale disclosures by institutional holders; no issuer proceeds indicated.

The filing lists specific resale transactions by two Atlas Venture funds dated 05/28/2026, showing share counts and gross proceeds. These are typical owner resale disclosures under Section 144 and do not by themselves change capitalization.

Timing and broader market impact depend on whether holders actually complete the sales; subsequent filings will show completed transactions or amendments.

Key Figures

Atlas Venture Fund XI shares sold: 2,441 shares Atlas Venture Fund XI proceeds: $34,051.95 Atlas Venture Opportunity Fund II shares sold: 419 shares +1 more

4 metrics

Atlas Venture Fund XI shares sold 2,441 shares sale dated 05/28/2026

Atlas Venture Fund XI proceeds $34,051.95 gross amount shown for 2,441 shares (05/28/2026)

Atlas Venture Opportunity Fund II shares sold 419 shares sale dated 05/28/2026

Atlas Venture Opportunity Fund II proceeds $5,845.05 gross amount shown for 419 shares (05/28/2026)

Key Terms

Form 144, Private Placement, Issuer

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 | 03/23/2023 | Private Placement"

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.

Issuer regulatory

"Private Placement | Issuer"

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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	21339	277193.61	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	03/23/2023	Private Placement	Issuer			21339	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 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 disclose?

It discloses proposed resales of Common Stock by holders, including two Atlas funds. The filing lists 2,441 shares for $34,051.95 and 419 shares for $5,845.05, both dated 05/28/2026, plus a referenced private placement dated 03/23/2023.

Do the Form 144 entries mean KRRO receives cash proceeds?

No — the Form 144 lists selling holders, not issuer proceeds. The excerpt attributes shares and dollar amounts to selling entities; it does not state that the issuer receives proceeds from these resales.

Who are the selling parties named in the KRRO filing?

The excerpt names Atlas Venture Fund XI, L.P. and Atlas Venture Opportunity Fund II, L.P. Each entry shows the fund address, share counts, and dollar amounts for transactions dated 05/28/2026.

Are the listed sales already completed for KRRO?

The Form 144 shows proposed or reported resale transactions with specific dates. Completion status is not further detailed in the excerpt; subsequent SEC filings or broker reports would confirm completed trades.