Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) For the quarterly period ended September 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-39413 VERTEX, INC. (Exact Name of Registrant as Specified in its Charter) | Delaware | 23-2081753 | | --- | --- | | (State or other jurisdiction of | (I.R.S. Employer | | incorporation or organizat ...