KYMR (NASDAQ) insiders sell 243,976 shares across April–June 2026

Rhea-AI Filing Summary

KYMR filed Form 144 reporting the resale of 243,976 shares of Common Stock. The notice lists multiple sales by Atlas Venture funds and affiliated individuals on 04/15/2026, 04/22/2026, 06/17/2026, and 06/18/2026, with per‑trade share counts and cash proceeds shown.

The entries identify the sales as resale transactions tied to a prior Private Placement (03/11/2020) and show cash proceeds for each trade; the filings are routine resale notices under Section 144.

Insights

Securities Attorney

Form 144 notices document affiliate resales of previously issued shares.

These filings list resale transactions by Atlas Venture funds and related persons, including specific dates, share counts, and cash proceeds. The filing ties the shares to a Private Placement dated 03/11/2020, consistent with Rule 144 resale mechanics for restricted securities.

Timing and proceeds are shown per trade; cash‑flow treatment is the selling holder receipt. Future public availability of additional resale notices may depend on holder decisions and applicable holding periods.

Key Figures

Registered/Reported shares: 243,976 shares Atlas Venture Fund X sale (largest listed): 100,928 shares Atlas Venture Fund X sale (06/17/2026): 92,169 shares +2 more

5 metrics

Registered/Reported shares 243,976 shares Form 144 filing header

Atlas Venture Fund X sale (largest listed) 100,928 shares trade dated 06/18/2026 with proceeds $9,185,730.49

Atlas Venture Fund X sale (06/17/2026) 92,169 shares trade dated 06/17/2026 with proceeds $8,330,667.41

Bruce Booth sale (06/17/2026) 11,741 shares trade dated 06/17/2026 with proceeds $1,056,443.24

Prior offering type Private Placement 03/11/2020 (issuer)

Key Terms

Form 144, Private Placement, Selling holder, Cash proceeds

4 terms

Form 144 regulatory

"Section header and resale notice lines showing reported sales"

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

"Line: '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.

Selling holder regulatory

"Table lines listing Atlas Venture Fund X, L.P. and Bruce Booth as sellers"

Cash proceeds financial

"Per‑trade dollar amounts listed next to share counts (e.g., $9,185,730.49)"

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Available on EDGAR 06/22/2026 - 05:28 PM Accepted by SEC EDGAR 06/22/2026 - 05:28 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	243976	22062749.68	82257588	06/22/2026	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			243976	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 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
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 report?

The filing reports the resale of 243,976 shares of Common Stock by affiliated holders. It lists multiple trades with dates, per‑trade share counts, and cash proceeds tied to a prior 03/11/2020 Private Placement.

Who sold shares according to the KYMR Form 144?

The sellers include Atlas Venture Fund X, L.P., Atlas Venture Opportunity Fund I, L.P., and individual Bruce Booth. Each seller's trade dates, share counts, and cash proceeds are listed in the notice.

When were the reported KYMR resale trades executed?

The filing lists trades on 04/14/2026, 04/15/2026, 04/22/2026, 06/17/2026, and 06/18/2026. Each line shows the exact trade date and corresponding shares sold and proceeds.

Do KYMR or the selling holders receive proceeds from these transactions?

The cash proceeds shown are proceeds to the selling holders for each trade. The filing identifies these as resales of restricted shares originating from the prior Private Placement (03/11/2020).

Does Form 144 register new shares for KYMR?

Form 144 is a notice of intent to resell restricted shares; it does not register new shares. The filing documents resale transactions by affiliates of previously issued securities from the 03/11/2020 Private Placement.