Syndax Pharmaceuticals Inc. filed SEC Form 8-K: Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

SYNDAX PHARMACEUTICALS, INC.

(Exact name of Registrant as Specified in Its Charter)

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.

On December 18, 2025, the Board of Directors of Syndax Pharmaceuticals Inc. (the “Company”) approved amendments to the Amended and Restated Bylaws (the “Bylaws”) of the Company, effective on such date. The amendments to the Bylaws provide that, beginning on December 18, 2025, shares of the Company’s capital stock shall be issued solely in uncertificated form; however, shares represented by a certificate issued prior to December 18, 2025 shall remain in certificated form until such certificate is surrendered to the Company.

The foregoing summary of the amendments effective December 18, 2025 does not purport to be complete and is qualified in its entirety by reference to the complete text of the Amended and Restated Bylaws of the Company, which are filed as Exhibit 3.1 hereto and are incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.