Insider plans sale of 7,412 common shares

A shareholder filed a notice of proposed sale under Rule 144 to sell 7,412 shares of common stock through Fidelity Brokerage Services LLC on or about 02/06/2026 on the NASDAQ.

Rhea-AI Filing Summary

A shareholder filed a notice of proposed sale under Rule 144 to sell 7,412 shares of common stock through Fidelity Brokerage Services LLC on or about 02/06/2026 on the NASDAQ. The filing reports an aggregate market value of $152,836.18 for these securities, compared with 86,914,838 shares outstanding for the issuer. The shares to be sold were acquired on 02/05/2026 via restricted stock vesting from the issuer as compensation, with payment also dated 02/05/2026. The signer represents they are not aware of undisclosed material adverse information about the issuer’s operations.

FAQ

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What does the Form 144 filing for SNDX disclose?

The Form 144 discloses a planned sale of 7,412 common shares of the issuer’s stock. The shares have an aggregate market value of $152,836.18 and are proposed to be sold on the NASDAQ through Fidelity Brokerage Services.

How many SNDX shares are planned to be sold under this Rule 144 notice?

The notice covers a proposed sale of 7,412 shares of common stock. These shares were recently acquired through restricted stock vesting as compensation and are being registered for potential sale in a single block through a brokerage firm.

What is the aggregate market value of the SNDX shares in this Form 144?

The filing states an aggregate market value of $152,836.18 for the 7,412 common shares to be sold. This value reflects the market price used in the Form 144 calculation for the proposed NASDAQ sale through Fidelity Brokerage Services LLC.

How were the SNDX shares in this Form 144 acquired?

The shares were acquired on 02/05/2026 through restricted stock vesting from the issuer as compensation. The same date is listed as the payment date, indicating they were granted rather than purchased for cash at the time of acquisition.

What does the Form 144 say about SNDX shares outstanding?

The filing reports that the issuer has 86,914,838 shares of common stock outstanding. This figure provides context for the 7,412 shares covered by the notice, showing the relative size of the proposed sale against the total outstanding shares.

Which broker and exchange are involved in this SNDX Form 144 sale?

The proposed sale will be handled by Fidelity Brokerage Services LLC and executed on the NASDAQ exchange. The Form 144 lists Fidelity’s Smithfield, Rhode Island address as the broker’s location for processing the transaction.

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Accepted by SEC EDGAR 02/06/2026 - 03:47 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	0001507220
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Syndax Pharmaceuticals Inc
SEC File Number	001-37708
Address of Issuer	730 THIRD AVENUE 9TH FLOOR NEW YORK NEW YORK 10017
Phone	781-419-1400
Name of Person for Whose Account the Securities are To Be Sold	Metzger Michael A
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	Officer
Relationship to Issuer	Director

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	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	7412	152836.18	86914838	02/06/2026	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	02/05/2026	Restricted Stock Vesting	Issuer			7412	02/05/2026	Compensation

* 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

Nothing to Report

144: Remarks and Signature

Remarks	Sale includes an amount necessary to cover a tax obligation resulting from the settlement of a vested equity award distribution.
Date of Notice	02/06/2026
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	/s/ Joshua Schmitt, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Michael A. Metzger.
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)