Atlas Venture sells KRRO common stock in late May–June 2026 (KRRO)

Rhea-AI Filing Summary

Atlas Venture entities filed Rule 144 notices reporting proposed and recent sales of Common Stock of KRRO. The notices list multiple transactions in May–June 2026, including executed sales on 06/22/2026 and 06/23/2026 with share counts and proceeds shown for each trade. The filing also references an earlier private placement by the issuer on 04/22/2024.

Insights

Capital Markets Counsel

Rules-based resale notices for affiliated holders; recent disposals recorded in late May–June 2026.

The excerpt lists multiple arm transactions by Atlas Venture funds showing exact share counts and gross proceeds per trade on specific dates, which is consistent with Rule 144 reporting requirements for restricted or control‑person resales.

Cash consideration is shown for prior issuer private placement on 04/22/2024; the filing itself documents sale dates and amounts but does not state any proceeds recipient beyond the selling holders.

Key Figures

Sale on 06/23/2026: 101,579 shares Proceeds on 06/23/2026: $1,447,785.17 Sale on 06/22/2026: 3,382 shares +3 more

6 metrics

Sale on 06/23/2026 101,579 shares Atlas Venture Fund XI, L.P. sale on <date>06/23/2026</date>

Proceeds on 06/23/2026 $1,447,785.17 Gross proceeds stated for 101,579 shares on <date>06/23/2026</date>

Sale on 06/22/2026 3,382 shares Atlas Venture Fund XI, L.P. sale on <date>06/22/2026</date>

Proceeds on 06/22/2026 $47,178.90 Gross proceeds stated for 3,382 shares on <date>06/22/2026</date>

Sale on 05/28/2026 2,441 shares Atlas Venture Fund XI, L.P. sale on <date>05/28/2026</date>

Private Placement date 04/22/2024 Issuer private placement date listed in the excerpt

Key Terms

Rule 144, Private Placement, Common Stock

3 terms

Rule 144 regulatory

"Filer Information | 144: Filer Information"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Private Placement market

"Securities To Be Sold | Private Placement | Issuer"

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.

Common Stock financial

"Securities Information | Common Stock | Nasdaq"

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 06/24/2026 - 05:50 PM Accepted by SEC EDGAR 06/24/2026 - 05:50 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	7093	97245.03	14422571	06/24/2026	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			7093	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 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

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 the KRRO Form 144 filing report?

Answer: It reports proposed and recent sales of KRRO common stock by Atlas Venture entities, listing share counts and gross proceeds for trades on specific dates in May–June 2026. The filing records multiple transactions and an earlier private placement on 04/22/2024.

Which Atlas Venture entities are named in the KRRO filing?

Answer: The filing names Atlas Venture Fund XI, L.P. and Atlas Venture Opportunity Fund II, L.P., each with transaction dates, share counts, and dollar amounts for sales in May–June 2026 as listed in the excerpt.

How many shares did Atlas Venture sell on 06/23/2026 according to the filing?

Answer: The excerpt shows 101,579 shares sold by Atlas Venture Fund XI, L.P. on 06/23/2026, with a corresponding gross proceeds figure of $1,447,785.17 as stated in the filing excerpt.

Does the filing state who received the sale proceeds for KRRO transactions?

Answer: The excerpt associates dollar amounts with each selling holder’s trades but does not name a third‑party recipient; proceeds are shown as gross values next to each sale and the private placement lists Cash as consideration.