Syndax Pharmaceuticals, Inc.

and in Exhibits 99.1 and 99.2 attached hereto is intended to be furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange

. Financial Statements and Exhibits. (d) Exhibits. Exhibit No. Description 99.1 Press Release, dated February 26, 2026 99.2 Corporate Presentation, dated Februa