Atlas Venture sells 101,579 shares (KRRO) in Form 144 notice

Rhea-AI Filing Summary

Atlas Venture Fund XI, L.P. and Atlas Venture Opportunity Fund II, L.P. filed Form 144 notices reporting proposed sales of Common Stock.

The excerpt lists multiple proposed sale dates and quantities, including a sale of 101,579 shares by Atlas Venture Fund XI on 06/23/2026 (reported value $1,447,785.17) and other smaller tranches on 05/28/2026, 06/22/2026 and 06/24/2026. The filings identify the trades as private-placement-related or resale activity for the issuer on Nasdaq.

Insights

Securities Attorney

Form 144 notices report proposed resale of unregistered common stock by venture funds.

These filings are procedural notices that document proposed sales by Atlas Venture Fund XI, L.P. and Atlas Venture Opportunity Fund II, L.P. of Common Stock, with dated entry lines and per-tranche share counts and dollar amounts.

The reported entries include a 101,579-share tranche on 06/23/2026 with a reported value of $1,447,785.17. Cash-flow treatment and whether sales were completed are not stated in the excerpt; subsequent confirmations would appear in trading or later filings.

Key Figures

Largest reported tranche: 101,579 shares Reported value for largest tranche: $1,447,785.17 Other Atlas Venture XI tranches: 41,345 shares; 3,382 shares; 2,441 shares +1 more

4 metrics

Largest reported tranche 101,579 shares Atlas Venture Fund XI on 06/23/2026

Reported value for largest tranche $1,447,785.17 Reported alongside 101,579 shares on 06/23/2026

Other Atlas Venture XI tranches 41,345 shares; 3,382 shares; 2,441 shares Dates: 06/24/2026, 06/22/2026, 05/28/2026

Atlas Venture Opportunity II tranches 17,426 shares; 7,093 shares; 580 shares; 419 shares Dates shown include 06/23/2026, 06/24/2026, 06/22/2026, 05/28/2026

Key Terms

Form 144, Private Placement, Resale of unregistered 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 | 03/23/2023 | 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.

Resale of unregistered securities regulatory

"Securities To Be Sold Common Stock Private Placement"

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

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

What does the KRRO Form 144 filing report?

It reports proposed sales of Common Stock by Atlas Venture entities. The excerpt lists dated tranches and share counts including 101,579 shares on 06/23/2026 valued at $1,447,785.17.

Who are the selling parties named in the filing for KRRO?

The sellers are Atlas Venture Fund XI, L.P. and Atlas Venture Opportunity Fund II, L.P. The excerpt shows each entity's address and multiple dated sale entries with share counts.

Which transaction in the excerpt is the largest by shares?

The largest listed tranche is 101,579 shares shown for Atlas Venture Fund XI, L.P. on 06/23/2026, with a reported dollar value of $1,447,785.17 in the excerpt.

Does the Form 144 excerpt state proceeds go to the issuer?

No. The excerpt records sale dates, share counts, and reported values for selling holders. The filing does not state that proceeds are received by the issuer.

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	85955	1173285.75	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	03/23/2023	Private Placement	Issuer			85955	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 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)