Trust 10% owner of Vertex (VERX) adds 10,000 Class A shares in open-market buy

Rhea-AI Filing Summary

Vertex, Inc. disclosed that the ITEM SECOND IRR. TRUST FBO KYLE R. WESTPHAL u/a of JEFFREY R. WESTPHAL dated October 5, 2001, a 10% owner, made an open-market purchase of 10,000 shares of Class A Common Stock at a weighted average price of $15.0477 per share. After this transaction, the trust directly owns 1,221,100 shares of Vertex Class A Common Stock. The price reflects multiple trades between $15.02 and $15.06.

Insider Trade Summary

Net Buyer: 10,000 shares ($150,477)

Net Buy 1 txn

Insider ITEM SECOND IRR. TRUST FBO KYLE R. WESTPHAL u/a of JEFFREY R. WESTPHAL dated October 5, 2001

Role 10% Owner

Bought 10,000 shs ($150K)

Type	Security	Shares	Price	Value
Purchase	Class A Common Stock	10,000	$15.0477	$150K

Holdings After Transaction: Class A Common Stock — 1,221,100 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

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).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

ITEM SECOND IRR. TRUST FBO KYLE R. WESTPHAL u/a of JEFFREY R. WESTPHAL dated October 5, 2001

(Last) (First) (Middle)

C/O VERTEX, INC.

2301 RENAISSANCE BLVD

(Street)

KING OF PRUSSIA PA 19406

(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)
03/09/2026

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

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	03/09/2026		P		10,000	D	$15.0477(1)	1,221,100	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 (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. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $15.02 to $15.06. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

	/s/ Joshua Levine, as Trustee	03/09/2026
	** 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).
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.

FAQ

What insider transaction did Vertex (VERX) report in this Form 4?

Vertex reported that the ITEM SECOND IRR. TRUST FBO KYLE R. WESTPHAL purchased 10,000 shares of Class A Common Stock in an open-market transaction at a weighted average price of $15.0477 per share, increasing its direct holdings to 1,221,100 shares.

Who is the reporting person in the Vertex (VERX) Form 4 filing?

The reporting person is the ITEM SECOND IRR. TRUST FBO KYLE R. WESTPHAL u/a of JEFFREY R. WESTPHAL dated October 5, 2001, identified as a 10% owner of Vertex, Inc., holding the Class A Common Stock directly following the reported purchase.

How many Vertex (VERX) shares did the trust buy and at what price?

The trust bought 10,000 shares of Vertex Class A Common Stock. The weighted average purchase price was $15.0477 per share, with individual trades executed in a price range from $15.02 to $15.06 according to the Form 4 footnote.

What is the total Vertex (VERX) share ownership after this Form 4 trade?

After the reported transaction, the ITEM SECOND IRR. TRUST FBO KYLE R. WESTPHAL directly owns 1,221,100 shares of Vertex Class A Common Stock, as stated in the Form 4’s post-transaction ownership column for non-derivative securities.

What type of transaction was reported in the Vertex (VERX) Form 4?

The Form 4 reports an open-market purchase of Class A Common Stock, coded “P” for purchase. The filing describes the transaction as an open-market purchase by the trust at a weighted average price based on multiple trades in a narrow price range.

Does the Form 4 specify the Vertex (VERX) insider’s ownership type?

Yes. The Form 4 labels the ownership of the 1,221,100 Vertex Class A Common shares as direct, using the ownership code “D,” indicating that the trust itself directly holds these shares following the reported open-market purchase transaction.