X0202 SCHEDULE 13G/A 0001598843 XXXXXXXX LIVE 5 Class A Common Stock 03/31/2026 0001806837 Vertex, Inc. 92538J106 2301 Renaissance Boulevard King of Prussia PA 19406 Rule 13d-1(b) Arthur C. Young b X1 0 3398563 0 3398563 3398563 N 4.37 IN This Amendment No. 5 constitutes an exit filing for the Reporting Persons (as defined below), as the Reporting Persons no longer beneficially own more than five percent of the outstanding shares of the Issuer. Douglas J. Dossey b X1 0 3398563 0 3398563 3398563 N 4.37 IN This Amendment No. 5 constitutes an exit filing for the Reporting Persons (as defined below), as the Reporting Persons no longer beneficially own more than five percent of the outstanding shares of the Issuer. Tensile Capital Management LP b DE 0.00 3398563 0.00 3398563 3398563 N 4.37 IA OO This Amendment No. 5 constitutes an exit filing for the Reporting Persons (as defined below), as the Reporting Persons no longer beneficially own more than five percent of the outstanding shares of the Issuer. Tensile Capital Management GP LLC b DE 0.00 3398563 0.00 3398563 3398563 N 4.37 OO This Amendment No. 5 constitutes an exit filing for the Reporting Persons (as defined below), as the Reporting Persons no longer beneficially own more than five percent of the outstanding shares of the Issuer. Tensile Capital GP LLC b DE 0.00 3398563 0.00 3398563 3398563 N 4.37 PN This Amendment No. 5 constitutes an exit filing for the Reporting Persons (as defined below), as the Reporting Persons no longer beneficially own more than five percent of the outstanding shares of the Issuer. Tensile Capital Partners Master Fund LP b E9 0.00 3398563 0.00 3398563 3398563 N 4.37 PN This Amendment No. 5 constitutes an exit filing for the Reporting Persons (as defined below), as the Reporting Persons no longer beneficially own more than five percent of the outstanding shares of the Issuer. Vertex, Inc. 2301 Renaissance Boulevard, King of Prussia, PA 19406 Arthur C. Young; Douglas J. Dossey; Tensile Capital Management LP; Tensile Capital Management GP LLC; Tensile Capital GP LLC; Tensile Capital Partners Master Fund LP 700 Larkspur Landing Circle, Suite 255, Larkspur, CA 94939 United States, Delaware N IA The information requested by this paragraph is incorporated herein by reference to the cover page to this Schedule 13G. See above. See above. See above. See above. See above. N Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. Arthur C. Young /s/ Arthur C. Young 04/02/2026 Douglas J. Dossey /s/ Douglas J. Dossey 04/02/2026 Tensile Capital Management LP /s/ Arthur C. Young 04/02/2026 Tensile Capital Management GP LLC /s/ Arthur C. Young 04/02/2026 Tensile Capital GP LLC /s/ Arthur C. Young 04/02/2026 Tensile Capital Partners Master Fund LP /s/ Arthur C. Young 04/02/2026