SNDX Rule 144: 31,235 Shares Proposed Sale

The issuer submitted a Rule 144 notice for the proposed sale of 31,235 shares of common stock on 06/12/2026, listed on NASDAQ, associated with a stock option exercise and reported in cash.

Accepted by SEC EDGAR 06/12/2026 - 04:10 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

The issuer submitted a Rule 144 notice for the proposed sale of 31,235 shares of common stock on 06/12/2026, listed on NASDAQ, associated with a stock option exercise and reported in cash. The filing also reports a prior sale of 34,280 shares on 06/11/2026 for $609,434.95.

Key Figures

Proposed shares to be sold: 31,235 shares Indicative aggregate amount: $566,692.87 Recent sale proceeds: $609,434.95

3 metrics

Proposed shares to be sold 31,235 shares Securities To Be Sold on 06/12/2026

Indicative aggregate amount $566,692.87 Amount shown on the same security row in excerpt

Recent sale proceeds $609,434.95 34,280 shares sold on 06/11/2026

Key Terms

Rule 144, stock option exercise, Fidelity Brokerage Services LLC

3 terms

Rule 144 regulatory

"Filer Information | Securities To Be Sold | Common | 06/12/2026"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

stock option exercise financial

"Securities To Be Sold | 06/12/2026 | Stock Option Exercise"

A stock option exercise is the act of using a previously granted right to buy shares of a company's stock at a specific, predetermined price by paying that price and receiving the shares. It matters to investors because exercising changes who owns the shares (which can dilute existing ownership), can trigger taxable events and shift potential gains or losses, and affects voting power and the company’s outstanding share count—like turning a voucher into an actual product that becomes part of circulating supply.

Fidelity Brokerage Services LLC other

"Common | Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does SNDX's Form 144 disclose about planned sales?

The Form 144 discloses a planned sale of 31,235 shares of common stock on 06/12/2026, linked to a stock option exercise. It identifies the trade method as cash.

Did SNDX report any recent sales in the past three months?

Yes. The filing reports a sale of 34,280 shares on 06/11/2026 with gross proceeds of $609,434.95. That transaction is listed under "Securities Sold During The Past 3 Months."

Who is listed as the broker or intermediary on the Form 144 for SNDX?

The filing lists Fidelity Brokerage Services LLC at 900 Salem Street, Smithfield, RI, as the broker/intermediary associated with the securities noted on the form.

What role does "stock option exercise" play in the SNDX filing?

The Form 144 links the proposed sale of 31,235 shares to a stock option exercise, indicating the shares to be sold arise from option exercise and the sale method is reported as cash.

Is the CUSIP or identifier shown in the Form 144 for SNDX?

The filing includes a numeric identifier sequence that appears alongside the security rows (example: 88610027), consistent with an identifying code shown in the excerpt.

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

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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	0002066784
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	Botwood Nicholas A.J.
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

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	31235	566692.87	88610027	06/12/2026	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	06/12/2026	Stock Option Exercise	Issuer			31235	06/12/2026	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
Nicholas Botwood 730 Third Avenue 9th Floor New York NY 10017	Common	06/11/2026	34280	609434.95

144: Remarks and Signature

Remarks
Date of Notice	06/12/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	03/11/2026
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/ Daniel Tucci, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Nicholas Botwood
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)