SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* Tensile Capital Management LP (Last) (First) (Middle) 700 LARKSPUR LANDING CIRCLE SUITE 255 (Street) LARKSPUR CA 94939 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol Vertex, Inc. [ VERX ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 09/29/2023
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person
	Rule 10b5-1(c) Transaction Indication Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A common stock	09/29/2023		S		60,000	D	$23.36(1)	5,806,717	I	By Tensile Capital Partners Master Fund LP(2)(3)(4)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. This transaction was executed in multiple trades at prices ranging from $23.11 to $23.39; the price reported above reflects the weighted average sale price. The Reporting Persons (as defined below) undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares and prices at which the transaction was effected.

2. The shares are held directly by Tensile Capital Partners Master Fund LP. The reporting persons ("Reporting Persons") are Douglas J. Dossey, Arthur C. Young, Tensile Capital Management LP, Tensile Capital Management GP LLC, Tensile Capital GP LLC and Tensile Capital Partners Master Fund LP.

3. The general partner and investment adviser of Tensile Capital Partners Master Fund LP are Tensile Capital GP LLC and Tensile Capital Management LP, respectively. The general partner of Tensile Capital Management LP is Tensile Capital Management GP LLC.

4. Douglas J. Dossey and Arthur C. Young are the controlling principals of Tensile Capital Management LP, Tensile Capital Management GP LLC, and Tensile Capital GP LLC. Each of the Reporting Persons may be deemed to share beneficial ownership of the shares with Tensile Capital Partners Master Fund LP. Each of the Reporting Persons disclaim beneficial ownership of the shares, except to the extent of such person's pecuniary interest therein, if any. This report shall not be deemed an admission that any of the Reporting Persons is the beneficial owner of the shares for purposes of Section 16 of the Securities and Exchange Act of 1934 or for any other purpose.

	Tensile Capital Partners Master Fund LP, by: Tensile Capital GP LLC, its General Partner, /s/ Arthur Young, Managing Partner	10/03/2023
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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