Christopher David Young - 01 Dec 2025 Form 4 Insider Report for Vertex, Inc. (VERX)

Role: President and CEO, Director
Signature: /s/ Lisa Coleman, Attorney-in-Fact
Issuer symbol: VERX
Transactions as of: 01 Dec 2025
Net transactions value: $0
Form type: 4
Filing time: 03 Dec 2025, 16:16:34 UTC
Previous filing: 10 Nov 2025
Next filing: 05 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Young Christopher David	President and CEO, Director	C/O VERTEX, INC., 2301 RENAISSANCE BLVD, KING OF PRUSSIA	/s/ Lisa Coleman, Attorney-in-Fact	03 Dec 2025	0001647655

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	VERX	Restricted Stock Units	Award	$0	+1,300,728		$0.000000	1,300,728	01 Dec 2025	Class A Common Stock	1,300,728		Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock.
F2	Represents an award of restricted stock units that will vest as to 25% of the amount of shares on each of November 10, 2026, November 10, 2027, November 10, 2028 and November 10, 2029.