KYMR affiliates report large June share sales (NASDAQ: KYMR)

Rhea-AI Filing Summary

KYMR reported affiliate sale notices under Rule 144 listing multiple proposed dispositions of Common Stock by Atlas Venture funds and an individual, with trades dated in April and June 2026. Examples include Atlas Venture Fund X, L.P. selling 243,976 shares for $24,182,608.35 on 06/22/2026 and Bruce Booth selling 11,741 shares for $1,056,443.24 on 06/17/2026.

Insights

Capital Markets Analyst

Rule 144 sale notices list recent affiliate dispositions, not company actions.

The excerpt lists multiple proposed or reported sales of Common Stock by affiliated holders, including dated transactions in April and June 2026. The filings show per‑transaction share counts and dollar amounts, which indicate actual disposals by the named holders.

Cash‑flow treatment is to the selling holders; the excerpt does not state proceeds to the issuer. Subsequent SEC filings or trading records will confirm settlement details.

Key Figures

Atlas Venture Fund X sale (06/22/2026): 243,976 shares Proceeds reported (Atlas Venture Fund X): $24,182,608.35 Atlas Venture Fund X sale (06/18/2026): 100,928 shares +3 more

6 metrics

Atlas Venture Fund X sale (06/22/2026) 243,976 shares sale reported on 06/22/2026

Proceeds reported (Atlas Venture Fund X) $24,182,608.35 amount reported for 243,976 shares on 06/22/2026

Atlas Venture Fund X sale (06/18/2026) 100,928 shares sale reported on 06/18/2026

Proceeds reported (Atlas 06/18/2026) $9,185,730.49 amount reported for 100,928 shares on 06/18/2026

Bruce Booth sale (06/17/2026) 11,741 shares sale reported on 06/17/2026

Proceeds reported (Booth 06/17/2026) $1,056,443.24 amount reported for 11,741 shares on 06/17/2026

Key Terms

Form 144, Private Placement, Issuer

3 terms

Form 144 regulatory

"144: Securities To Be Sold"

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"

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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Available on EDGAR 06/23/2026 - 06:14 PM Accepted by SEC EDGAR 06/23/2026 - 06:14 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	173	17204.85	82257588	06/23/2026	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			173	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 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
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

Who filed the Rule 144 notices for KYMR?

The notices were filed by affiliated sellers including Atlas Venture Fund X, L.P., Atlas Venture Opportunity Fund I, L.P., and Bruce Booth. The excerpt lists these entities and the dated transactions in April and June 2026.

How many shares did Atlas Venture Fund X, L.P. sell on 06/22/2026 for KYMR?

Atlas Venture Fund X, L.P. sold 243,976 shares on 06/22/2026 for $24,182,608.35, as shown in the excerpt. The entry is part of several dated disposals by that fund in the April–June 2026 period.

What did Bruce Booth report selling in the KYMR notices?

Bruce Booth reported selling multiple tranches, including 11,741 shares on 06/17/2026 for $1,056,443.24 and earlier sales in April. The excerpt lists each sale with date, share count, and dollar amount.

Do these Rule 144 entries indicate KYMR will receive proceeds?

No. The listed transactions name selling holders and dollar amounts received by those holders; the excerpt shows these as affiliate dispositions and does not state any proceeds were received by the issuer.