Sec Form 4 Filing - Westphal Jeffery @ Vertex, Inc. - 2020-12-30

FORM 4 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 Westphal Jeffery 2. Issuer Name and Ticker or Trading Symbol Vertex, Inc. [ VERX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O VERTEX, INC., 2301 RENAISSANCE BLVD. 3. Date of Earliest Transaction (MM/DD/YY) 12/30/2020 (Street) KING OF PRUSSIA, PA19406 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 12/30/2020 C 300,000 ( 1 ) A $ 0 307,895 D

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 Class B Common Stock ( 2 ) 12/30/2020 C 300,000 ( 2 ) ( 2 ) Class A Common Stock 300,000 ( 3 ) $ 0 49,000 D Class B Common Stock ( 2 ) ( 2 ) ( 2 ) Class A Common Stock 28,169,052.63 28,169,052.63 I By The 2009 Jeffrey R. Westphal Generation Skipping Trust Class B Common Stock ( 2 ) ( 2 ) ( 2 ) Class A Common Stock 1,153,756 ( 3 ) 1,153,756 I By Rainer J. Westphal 2007 Separate Exempt Trust FBO Jeffrey Westphal Class B Common Stock ( 2 ) ( 2 ) ( 2 ) Class A Common Stock 332,244 ( 3 ) 332,244 I By Rainer J. Westphal 2007 Separate Non-Exempt Trust FBO Jeffrey Westphal

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Westphal Jeffery C/O VERTEX, INC. 2301 RENAISSANCE BLVD. KING OF PRUSSIA, PA19406 X X Signatures By: /s/ Bryan Rowland, Attorney-in-Fact for Jeffrey Westphal 01/04/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The shares of Class A Common Stock reported herein remain subject to a lock-up agreement with the underwriters for the Issuer's initial public offering. ( 2 )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. ( 3 )Acquired from the Irrevocable Trust of Rainer J. Westphal, Settlor, dated July 19, 2007 - Separate Trust for Benefit of Jeffrey Westphal in a series of transactions exempt from reporting under Rule 16a-13.

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).

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