Sec Form 4 Filing - Rowland Bryan T.R. @ Vertex, Inc. - 2021-03-01

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

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person Rowland Bryan T.R. 2. Issuer Name and Ticker or Trading Symbol Vertex, Inc. [ VERX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) GENERAL COUNSEL (Last) (First) (Middle) C/O VERTEX, INC., 2301 RENAISSANCE BLVD 3. Date of Earliest Transaction (MM/DD/YY) 03/01/2021 (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 03/17/2021 M 62,196 A $ 3.734 64,828 D Class A Common Stock 03/17/2021 F 26,485 D $ 25.67 38,343 D Class A Common Stock 03/17/2021 M 62,430 A $ 3.167 100,773 D Class A Common Stock 03/17/2021 F 30,951 D $ 25.67 70,292( 1 ) 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 Stock Option $ 3.734 03/17/2021 M 62,196 ( 2 ) 02/07/2029 Class A Common Stock 62,196 $ 0 62,196 D Stock Option $ 3.167 03/17/2021 M 62,430 ( 3 ) 02/09/2028 Class A Common Stock 62,430 $ 0 62,433 D Stock Option $ 32.16 03/01/2021 A 4,027 ( 4 ) 03/01/2031 Class A Common Stock 4,027 $ 0 4,027 D Restricted Stock Units ( 5 ) 03/01/2021 A 3,465 ( 6 ) ( 6 ) Class A Common Stock 3,465 $ 0 3,465 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Rowland Bryan T.R. C/O VERTEX, INC. 2301 RENAISSANCE BLVD KING OF PRUSSIA, PA19406 GENERAL COUNSEL Signatures /s/ Lisa Coleman, Attorney-in-Fact 11/12/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Includes 53 shares of restricted stock that were inadvertently omitted from filer's Form 3 and 417 shares acquired through the Company's Employee Stock Purchase Plan. The amount reported in column 5 reflects the number of shares of Class A Common Stock beneficially owned as of the date hereof. ( 2 )This option became exercisable with respect to 50% of the shares on February 7, 2021, and will vest with respect to the remaining shares on February 7, 2024. ( 3 )This option became exercisable as to 50% of the shares on the date of grant and will vest with respect to the remaining shares on February 9, 2023. ( 4 )This option will vest and become exercisable with respect to 25% of the shares on each of March 1, 2022, March 1, 2023, March 1, 2024 and March 1, 2025. ( 5 )Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock. ( 6 )Represents an award of restricted stock units that will vest as to 50% of the amount of shares on March 1, 2023, and 25% of the shares on each of March 1, 2024 and March 1, 2025.

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).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.