144 0001607606 XXXXXXXX LIVE 0001806837 Vertex, Inc. 001-39413 2301 RENAISSANCE BOULEVARD KING OF PRUSSIA PA 19406 (800) 355-3500 Rowland Bryan T.R. Officer Class A Fidelity Brokerage Services LLC

900 Salem Street Smithfield RI 02917

43228 1555514.33 71702437 03/19/2025 NASDAQ Class A 02/10/2025 Restricted Stock Vesting Issuer N 2838 02/10/2025 Compensation Class A 02/22/2025 Restricted Stock Vesting Issuer N 2996 02/22/2025 Compensation Class A 02/23/2025 Restricted Stock Vesting Issuer N 4661 02/23/2025 Compensation Class A 03/19/2025 Options Granted - 07/28/2020 Issuer N 31098 03/19/2025 Cash Class A 03/19/2025 Options Granted - 03/01/2021 Issuer N 1007 03/19/2025 Cash Class A 03/01/2025 Restricted Stock Vesting Issuer N 628 03/01/2025 Compensation Y 03/19/2025 11/26/2024 /s/ Tyler Johnson, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Bryan Rowland