Vertex, Inc. — Director's Dealing 2025

May 22, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Vertex, Inc. (VERX)
CIK: 0001806837
Period of Report: 2025-05-20

Reporting Person: 2020 IRREVOCABLE TRUST FOR BENEFIT OF CONSTANCE A. THOMPSON (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-05-20	Class A Common Stock	C	22500	—	Acquired	22500	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-05-20	Class B Common Stock	$	C	22500	Disposed		Class A Common Stock (22500)	Direct

Footnotes

F1: The Class B Common Stock is convertible at any time at the option of the holder into one share of the Issuer's Class A Common Stock and has no expiration date. The Class B Common Stock will automatically convert into shares of the Issuer's Class A Common Stock on a one-to-one basis upon either (1) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (2) the voting power of the Issuer's outstanding Class B Common Stock representing less than 10% of the combined voing power of all of the Issuer's outstanding common stock.

F2: The Form 3 originally filed by the reporting person understated the reporting person's ownership of Class B Common Stock by approximately 7,317.758 shares. This Form 4 reflects the correct number of shares.