X0609 4 2026-08-14 0 0001725160 Zentalis Pharmaceuticals, Inc. ZNTL 0001177523 WALTERS GROUP false 8975 S. PECOS ROAD UNIT 6A HENDERSON NV 89074 0 0 1 0 0001689655 WALTERS WILLIAM THURMAN false 8975 S. PECOS ROAD UNIT 6A HENDERSON NV 89074 0 0 1 0 0001689761 WALTERS SUSAN BERKLEY false 8975 S. PECOS ROAD UNIT 6A HENDERSON NV 89074 0 0 1 0 0 Common Stock 2026-08-14 4 P 0 4335000 3.5 A 17844973 D The shares of common stock reported herein (the "Shares") are held directly by The Walters Group (the "TWG"). William T. Walters may be deemed to share voting and dispositive power with respect to the Shares. Susan B. Walters is the general partner and majority member of TWG and may be deemed to share voting and dispositive power with respect to the Shares. Each Reporting Person disclaims Section 16 beneficial ownership of the Shares reported herein except to the extent of its pecuniary interest therein, if any, and the inclusion of these Shares in this report shall not be deemed an admission of beneficial ownership of any of the reported Shares for purposes of Section 16 or any other purpose. The Walters Group, By: Susan B. Walters, Name: Susan B. Walters, Title: General Partner 2026-08-19 William T. Walters 2026-08-19 Susan B. Walters 2026-08-19