KYMR (NASDAQ: KYMR) Atlas Venture funds report multi-date share sales in June 2026

Rhea-AI Filing Summary

KYMR selling holders reported proposed sales of Common Stock on a Form 144. The filing lists multiple dispositions by Atlas Venture funds and an individual associated with the funds, with trade dates in April–June 2026.

The excerpt shows multiple transactions including large block dispositions, including Atlas Venture Fund X, L.P. (243,976 shares on 06/22/2026) and Atlas Venture Fund X, L.P. (118,178 shares on 06/24/2026). The filing identifies the sale method as Private Placement for prior issuances and cash as consideration for past sales.

Insights

Securities Counsel

Rule 144 notice of proposed resale activity by venture funds and an associated individual.

The filing lists multiple proposed and completed dispositions of Common Stock with trade dates in April–June 2026, attributable to Atlas Venture funds and an individual. The notice format signals compliance with resale reporting requirements rather than a corporate action.

Cash consideration and Private Placement origin are noted for prior issuances; subsequent Form 144 filings or broker confirmations will clarify closing mechanics and whether shares were sold under Rule 144 volume/holding-period conditions.

Key Figures

243,976 shares: 243,976 shares 118,178 shares: 118,178 shares 24182608.35 proceeds: $24,182,608.35 +4 more

7 metrics

243,976 shares 243,976 shares sale by Atlas Venture Fund X, L.P. on 06/22/2026

118,178 shares 118,178 shares sale by Atlas Venture Fund X, L.P. on 06/24/2026

24182608.35 proceeds $24,182,608.35 proceeds reported for 243,976-share sale on 06/22/2026

11877944.68 proceeds $11,877,944.68 proceeds reported for 118,178-share sale on 06/24/2026

100,928 shares 100,928 shares sale by Atlas Venture Fund X, L.P. on 06/18/2026

12,902 shares 12,902 shares sale by Atlas Venture Opportunity Fund I, L.P. on 06/17/2026

4,159 shares 4,159 shares sale by Bruce Booth on 04/14/2026

Key Terms

Private Placement, Common Stock, Form 144

3 terms

Private Placement regulatory

"Securities To Be Sold: Common Stock | 03/11/2020 | 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.

Common Stock financial

"144: Securities Sold During The Past 3 Months | Atlas Venture Fund X, L.P. | Common"

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.

Form 144 regulatory

"form_type: 144 (reporting proposed sales of restricted/controlled securities)"

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.

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Available on EDGAR 06/25/2026 - 05:26 PM Accepted by SEC EDGAR 06/25/2026 - 05:26 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	67329	6724147.23	82257588	06/25/2026	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	03/11/2020	Private Placement	Issuer			67329	03/11/2020	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 X, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common	04/15/2026	2750	247765.57
Atlas Venture Fund X, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common	04/22/2026	88	7926.6
Atlas Venture Fund X, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common	06/17/2026	92169	8330667.41
Atlas Venture Fund X, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common	06/18/2026	100928	9185730.49
Atlas Venture Fund X, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common	06/22/2026	243976	24182608.35
Atlas Venture Fund X, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common	06/23/2026	1235	123470.07
Atlas Venture Fund X, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common	06/24/2026	118178	11877944.68
Atlas Venture Opportunity Fund I, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common	04/15/2026	385	34687.18
Atlas Venture Opportunity Fund I, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common	04/22/2026	12	1080.9
Atlas Venture Opportunity Fund I, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common	06/17/2026	12902	1166143.4
Atlas Venture Opportunity Fund I, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common	06/18/2026	14128	1285827.52
Atlas Venture Opportunity Fund I, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common	06/22/2026	34152	3385105.26
Atlas Venture Opportunity Fund I, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common	06/23/2026	173	17295.81
Atlas Venture Opportunity Fund I, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common	06/24/2026	16542	1662618.77
Bruce Booth 300 Technology Sq Ste 8 Cambridge MA 02139	Common	04/14/2026	4159	374199.56
Bruce Booth 300 Technology Sq Ste 8 Cambridge MA 02139	Common	04/15/2026	2200	197895.00
Bruce Booth 300 Technology Sq Ste 8 Cambridge MA 02139	Common	04/22/2026	5900	530746.25
Bruce Booth 300 Technology Sq Ste 8 Cambridge MA 02139	Common	06/17/2026	11741	1056443.24

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 KYMR Form 144 disclosure mean?

It reports proposed or effected sales of KYMR common stock by holders. The excerpt lists specific trades and dates, showing multiple dispositions by Atlas Venture funds and an associated individual in April–June 2026.

Who are the largest sellers reported in the KYMR excerpt?

Atlas Venture entities and an associated individual are the primary sellers. The excerpt includes block sales by Atlas Venture Fund X, L.P. and Atlas Venture Opportunity Fund I, L.P. with multiple trades in June 2026.

How many shares did Atlas Venture Fund X, L.P. sell in the excerpt?

The excerpt records multiple transactions for Atlas Venture Fund X, L.P., including sales of 243,976 shares on 06/22/2026 and 118,178 shares on 06/24/2026, among others listed.

Does the Form 144 excerpt state the sale proceeds?

Yes; individual transactions list dollar amounts alongside share counts. For example, the 243,976-share sale shows $24,182,608.35 in proceeds as recorded in the excerpt.

Was the stock originally issued in a private placement?

The excerpt identifies prior issuance method as Private Placement for the securities to be sold, with an original issuance date of 03/11/2020, and indicates cash consideration for past sales.