KYMR (Nasdaq) holders file Form 144 to report April 2026 sales

Rhea-AI Filing Summary

KYMR reported proposed dispositions of Common Stock under Form 144 by certain holders, listing specific sale dates and share counts. The filing lists multiple reported sales in April 2026, including 2,750 shares on 04/15/2026 and 5,900 shares on 04/22/2026 by identified holders. The transactions are presented as reported sale notices for shares originally issued in a Private Placement dated 03/11/2020.

Insights

Corporate Securities Counsel

Form 144 notices report proposed or intended sales by holders; they are compliance filings, not confirmations of executed trades.

These entries list multiple dispositions by named holders with specific dates and share amounts, consistent with required notices for restricted or control stock sales. The filing cites an original issuance date of 03/11/2020, indicating the securities trace to a private placement.

Whether sales occurred and the timing of any executions are not confirmed here; subsequent transfer or trade reporting would appear in transaction filings or market records.

Equity Capital Markets Analyst

The filing documents potential secondary selling interest from early investors and insiders during April 2026.

The notices enumerate per-holder sale sizes (e.g., 5,900 shares, 4,159 shares) and cash amounts for those dates. These are disclosure-oriented and do not specify proceeds recipient treatment beyond seller identities.

Subsequent confirmations (trade reports or Forms 4/5) would clarify executed volumes and impact on free float.

Key Figures

Sale notice - Atlas Venture Fund X on 04/15/2026: 2,750 shares Sale notice - Atlas Venture Fund X on 04/22/2026: 88 shares Sale notice - Bruce Booth aggregate entry: 11,259 shares +3 more

6 metrics

Sale notice - Atlas Venture Fund X on 04/15/2026 2,750 shares sale notice dated 04/15/2026

Sale notice - Atlas Venture Fund X on 04/22/2026 88 shares sale notice dated 04/22/2026

Sale notice - Bruce Booth aggregate entry 11,259 shares individual entries of 4,159, 2,200, and 5,900 shares in April 2026

Original issuance Private Placement dated 03/11/2020 issuance date tied to the securities now reported for sale

Sale notice - Atlas Venture Opportunity Fund I on 04/15/2026 385 shares sale notice dated 04/15/2026

Sale notice - Atlas Venture Opportunity Fund I on 04/22/2026 12 shares sale notice dated 04/22/2026

Key Terms

Form 144, Private Placement, Securities to Be Sold

3 terms

Form 144 regulatory

"Form 144 filing lists securities to be sold and sale notices"

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

"Issuer | Private Placement | 03/11/2020 appears as original issuance method"

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.

Securities to Be Sold regulatory

"Section indicating Common Stock and dates for securities to be sold"

FAQ

What does KYMR's Form 144 filing mean?

Form 144 is a notice of proposed sale of restricted or control securities. The filing lists specific holders, dates, and share counts such as 2,750 shares on 04/15/2026, indicating planned dispositions tied to a 03/11/2020 private placement.

Did KYMR report actual insider sales in April 2026?

The filing reports proposed or intended sales with dates in April 2026 (for example, 04/15/2026 and 04/22/2026). It does not itself confirm whether each proposed sale was executed; execution appears in separate trade reports or Forms 4/5.

Who are the sellers named in the KYMR Form 144?

Named sellers include investment entities and individuals such as Atlas Venture Fund X, L.P., Atlas Venture Opportunity Fund I, L.P., and Bruce Booth, each with listed share counts and sale dates in April 2026 tied to prior issuance.

Are the reported shares from a registered offering or a private placement?

The filing links the securities to a Private Placement dated 03/11/2020. The notices therefore concern resale of privately placed shares rather than a new registered primary offering.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 06/17/2026 - 05:26 PM Accepted by SEC EDGAR 06/17/2026 - 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	12902	1128150.88	82257588	06/17/2026	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			12902	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 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
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

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)