Sec Form 3 Filing - Tensile Capital Management LP @ Vertex, Inc. - 2022-07-27

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Tensile Capital Management LP 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) (Last) (First) (Middle) 700 LARKSPUR LANDING CIRCLE, SUITE 255 3. Date of Earliest Transaction (MM/DD/YY) 07/27/2022 (Street) LARKSPUR, CA94939 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 5,220,258 I By Tensile Capital Partners Master Fund LP( 1 )( 2 )( 3 )

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 of Derivative Security: 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 Stock Option (Right to Buy) $ 7.85 ( 4 ) 10/25/2022 Class A common stock 750,000 I By Tensile Capital Partners Master Fund LP( 1 )( 2 )( 3 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Tensile Capital Management LP 700 LARKSPUR LANDING CIRCLE, SUITE 255 LARKSPUR, CA94939 X Signatures Tensile Capital Partners Master Fund LP, by: Tensile Capital GP, LLC, its General Partner, /s/ Arthur Young, Managing Partner 08/05/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The shares and stock option 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. ( 2 )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. ( 3 )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 Securities with Tensile Capital Partners Master Fund LP. Each of the Reporting Persons disclaim beneficial ownership of the Securities, 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 Securities for purposes of Section 16 of the Securities and Exchange Act of 1934 or for any other purpose. ( 4 )Stock option is immediately exercisable until expiration 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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