Vertex, Inc. 10-Q

ITEM 5. OTHER INFORMATION None. ​ -70- Table of Contents ITEM 6. EXHIBITS ​ Exhibit Number Exhibit Description Form File No. Exhibit Filing Date Filed Herewith Furnished Herewith 31.1 Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ X 31.2 Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ X 32.1 Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ X 32.2 Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ X 101.INS XBRL Instance Document ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ X 101.SCH XBRL Taxonomy Extension Schema Document ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ X 101.CAL XBRL Taxonomy Extension Calculation Linkbase Document ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ X 101.DEF XBRL Taxonomy Extension Definition Linkbase Document ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ X 101.LAB XBRL Taxonomy Extension Label Linkbase Document ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ X 101.PRE XBRL Taxonomy Extension Presentation Linkbase Document ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ X ​ ​ ​ ​ -71- Table of Contents 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 thereunto duly authorized. ​ ​ Vertex, Inc. ​ Date: November 12, 2020 ​ By: /s/ David DeStefano ​ David DeStefano ​ President, Chief Executive Officer and Chairperson (principal executive officer) ​ Date: November 12, 2020 ​ By: /s/ John Schwab ​ John Schwab ​ Chief Financial Officer (principal financial officer) ​ -72-