KYMR (NASDAQ) Form 144 lists Atlas Venture planned sales totaling large share blocks

Rhea-AI Filing Summary

KYMR submitted a Form 144 notice disclosing proposed sales of Common Stock by several selling holders, including multiple sales by Atlas Venture Fund X, L.P. and affiliates between 04/15/2026 and 06/25/2026

The excerpt lists individual sale dates, share quantities, and gross proceeds for each transaction (for example, 480,992 shares for $57,122,898.52 on 06/25/2026). These are routine resale notices under applicable securities rules.

Insights

Securities Compliance Counsel

Form 144 notices disclose proposed brokered resales by registered holders.

Form 144 is a mandated notice for certain unregistered sales of restricted or control securities; it lists dates, share quantities, and gross proceeds for proposed transactions by institutional holders and individuals. The filing itself does not consummate sales—it records intended dispositions.

Timing and execution depend on broker arrangements and rule compliance; subsequent Form 4s or broker reports may show completed transactions. Review subsequent public filings for final settlement details.

Key Figures

Largest single listed sale: 480,992 shares Gross proceeds (example): $57,122,898.52 Other large listed sale: 243,976 shares +3 more

6 metrics

Largest single listed sale 480,992 shares proposed sale on <date>06/25/2026</date>

Gross proceeds (example) $57,122,898.52 proceeds tied to 480,992 shares on <date>06/25/2026</date>

Other large listed sale 243,976 shares proposed sale on <date>06/22/2026</date>

Gross proceeds (other example) $24,182,608.35 proceeds tied to 243,976 shares on <date>06/22/2026</date>

Form type Form 144 notice of proposed sale of restricted/control securities

Sale date range 04/15/2026 - 06/25/2026 dates shown for proposed sales

Key Terms

Form 144, Private Placement, Gross proceeds, Issuer

4 terms

Form 144 regulatory

"Lists proposed sales of Common Stock with dates and proceeds"

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 | 03/11/2020 | Private Placement | Issuer"

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.

Gross proceeds financial

"Each line shows a dollar amount corresponding to a proposed sale"

The total amount of cash a company receives from a financing event or sale before any fees, expenses, taxes or deductions are taken out. Investors watch gross proceeds because it shows the raw scale of new capital being raised—think of it as the paycheck amount before withholdings—which helps assess how much funding is available for operations, growth, debt payoff or how much shareholder dilution might occur once costs are removed.

Issuer regulatory

"Private Placement listed with role 'Issuer' in securities to be sold"

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Available on EDGAR 06/26/2026 - 04:52 PM Accepted by SEC EDGAR 06/26/2026 - 04:52 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	410427	47798328.42	82257588	06/26/2026	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			410427	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 Fund X, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common	06/25/2026	480992	57122898.52
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
Atlas Venture Opportunity Fund I, L.P. 300 Technology Sq Ste 8 Cambridge MA 02139	Common	06/25/2026	67329	7996032.44
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 KYMR's Form 144 filing show?

The filing lists proposed sales of Common Stock by holders including Atlas Venture entities and individuals between 04/15/2026 and 06/25/2026. It provides sale dates, share counts, and gross proceeds for each proposed disposition.

Does Form 144 mean the shares have been sold for KYMR?

No. Form 144 is a notice of proposed resale; it does not confirm settlement. It lists intended sale quantities and gross proceeds, but actual sale completion and final reporting occur in separate broker reports or filings.

Who are the primary sellers listed in the KYMR excerpt?

The excerpt shows institutional sellers such as Atlas Venture Fund X, L.P. and Atlas Venture Opportunity Fund I, L.P., plus individuals like Bruce Booth, with multiple dated proposed sales and listed proceeds.

What are example transaction sizes reported in the KYMR excerpt?

Examples include proposed sales of 480,992 shares for $57,122,898.52 on 06/25/2026 and 243,976 shares for $24,182,608.35 on 06/22/2026, as shown in the listing.