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‌Exhibit 19.1

Vertex, Inc.

Insider Trading Compliance Policy Contents

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Vertex, Inc.

Insider Trading Compliance Policy

Federal and state laws prohibit trading in the securities of a company while in possession of material nonpublic information and in breach of a duty of trust or confidence. These laws and regulations also prohibit anyone who is aware of material nonpublic information from providing this information to others who may trade. Vertex, Inc. (together with its subsidiaries, the “Company”) requires its personnel to comply at all times with federal laws and regulations governing insider trading. Violating such laws can undermine investor trust, harm the Company’s reputation, and result in your dismissal from the Company or even serious criminal and civil charges against you and the Company. The Company reserves the right to take disciplinary or other measure(s) it determines in its sole discretion to be appropriate in any particular situation, including disclosure of wrongdoing to governmental authorities.  

This Insider Trading Compliance Policy (this “Policy”) outlines your responsibilities to avoid insider trading and implements certain procedures to help you avoid even the appearance of insider trading.

Summary

Preventing insider trading is necessary to comply with securities laws and to preserve the reputation and integrity of the Company. The criminal penalties for violating insider trading laws include imprisonment and fines of up to $5 million for individuals and $25 million for corporations. Insider trading may also result in civil penalties, including disgorgement of profits and civil fines. Insider trading is also prohibited by this Policy, and violation of this Policy may result in Company-imposed sanctions, including removal or dismissal for cause.

Persons Covered and Administration of Policy

This Policy applies to all officers, directors, and employees of the Company. For purposes of this Policy, “officers” refer to those individuals who meet the definition of “officer” under Section 16 of the Securities Exchange Act of 1934 (as amended, the “1934 Act”). As someone subject to this Policy, you are responsible for ensuring that members of your household also comply with this Policy. This Policy also applies to any entities you control, including any corporations, partnerships, or trusts, and transactions by such entities should be treated for the purposes of this Policy and applicable securities laws as if they were for your own account. The Company may determine that this Policy applies to additional persons with access to material nonpublic information, such as contractors or consultants. Every officer, director, and employee must review this Policy. Questions regarding the Policy should be directed to the Company’s Compliance Officer (as defined below).

The General Counsel of the Company (the “Compliance Officer”) shall be responsible for the administration of this Policy.

In the absence of the Compliance Officer, responsibility for administering this Policy will rest with the Chief Financial Officer or such other employee as may be designated by the Compliance Officer.

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In all cases, as someone subject to this Policy, you bear full responsibility for ensuring your compliance with this Policy, and also for ensuring that members of your household (and individuals not residing in your household but whose transactions are subject to your influence or control) and entities under your influence or control are in compliance with this Policy.

Actions taken by the Company, the Compliance Officer, or any other Company personnel do not constitute legal advice, nor do they insulate you from the consequences of noncompliance with this Policy.

Statement of Policies Prohibiting Insider Trading

No officer, director, or employee (or any other person designated as subject to this Policy) shall:

For this purpose:

“Securities” includes stocks, bonds, notes, debentures, options, warrants, equity and other convertible securities, as well as derivative instruments.

“Purchase” and “sale” are defined broadly under the federal securities law. “Purchase” includes not only the actual purchase of a security, but also any contract to purchase or otherwise acquire a security. “Sale” includes not only the actual sale of a security, but also any contract to sell or otherwise dispose of a security. These definitions extend to a broad range of transactions, including conventional cash-for-stock transactions, conversions, the exercise of stock options or warrants, puts, calls, pledging and margin loans, or other derivative securities.

Information is considered “material” if there is a substantial likelihood that a reasonable investor would consider it important in making a decision to buy, sell, or hold a security, or if the information is likely to have a significant effect on the market price of the security. Material information can be positive or negative and can relate to virtually any aspect of a company’s business or to any type of security. Also, information that something is likely to happen in the future—or even just that it may happen—could be deemed material.

Examples of material information may include (but are not limited to) information about:

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Information is “nonpublic” if it is not available to the general public. In order for information to be considered “public,” it must be widely disseminated in a manner that makes it generally available to investors in a Regulation FD-compliant method, such as through a press release, a filing with the U.S. Securities and Exchange Commission (the “SEC”) or a Regulation FD-compliant conference call. The Compliance Officer shall have sole discretion to decide whether information is public for purposes of this Policy.

The circulation of rumors, even if accurate and reported in the media, does not constitute public dissemination. In addition, even after a public announcement, a reasonable period of time may need to lapse in order for the market to react to the information. Generally, the passage of two full trading days following release of the information to the public, is a reasonable waiting period before such information is deemed to be public.

The laws and regulations concerning insider trading are complex, and you are encouraged to seek guidance from the Compliance Officer prior to considering a transaction in securities.

Quarterly Blackout Periods

No officer, director or employee shall purchase or sell any security of the Company during the period beginning on the 14th calendar day before the end of any fiscal quarter of the Company and ending upon completion of the second full trading day after the public release of earnings data for such fiscal quarter or during any other trading suspension period declared by the Company.

For the purposes of this Policy, a “trading day” is a day on which U.S. national stock exchanges are open for trading. If, for example, the Company were to release earnings on Monday prior to 9:30 a.m. Eastern Time, then the blackout period would terminate after the close of trading on Tuesday. If the Company were to release earnings on Monday after 9:30 a.m. Eastern Time, then the blackout period would terminate after the close of trading on Wednesday. Any question as to whether information is publicly available shall be directed to the Compliance Officer.

From time to time, events will occur that are material to the Company and cause certain officers, directors, or employees to be in possession of material nonpublic information. When that happens, the Company will require that those in possession of the material nonpublic

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information suspend all trading in the Company’s securities until the information is no longer material or has been publicly disclosed.

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When such event-specific blackout periods occur, those subject to it will be notified by the Company. The event-specific blackout period will not be announced to those not subject to it, and those subject to it or otherwise aware of it should not disclose it to others.

Even if the Company has not notified you that you are subject to an event-specific blackout period, if you are aware of material nonpublic information about the Company, you should not trade in Company securities. Any failure by the Company to designate you as subject to an event- specific blackout period, or to notify you of such designation, does not relieve you of your obligation not to trade in the Company’s securities while possessing material nonpublic information.

No officer, director, or employee shall directly or indirectly communicate (or “tip”) material nonpublic information to anyone outside the Company (except in accordance with the Company’s policies regarding the protection or authorized external disclosure of Company information) or to anyone within the Company other than on a “need-to-know” basis.

Pre-Clearance of Transactions

To provide assistance in preventing inadvertent violations of applicable securities laws and to avoid the appearance of impropriety in connection with the purchase and sale of the Company’s securities, all transactions in the Company’s securities (including, without limitation, acquisitions and dispositions of Company stock, the exercise of stock options, elective transactions under 401(k)/ESPP/deferred compensation plans, and the sale of Company stock issued upon exercise of stock options) by directors and officers subject to the provisions of Section 16  of the 1934 Act (each, a “Preclearance Person”), with their controlled entities and household members, must be precleared by the Company’s Compliance Officer, except for certain exempt transactions as explained in this Policy. Preclearance does not relieve you of your responsibility under SEC rules.

A request for preclearance must be in writing (including by e-mail), should be made at least two business days in advance of the proposed transaction, and should include the identity of the Preclearance Person, the type of proposed transaction (for example, an open market purchase, a privately negotiated sale, an option exercise, etc.), the proposed date of the transaction, and the number of shares or other securities to be involved. In addition, the Preclearance Person must execute a certification (in the form approved by the Compliance Officer) that he or she is not aware of material nonpublic information about the Company. The Compliance Officer, or the Chief Financial Officer for transactions by the Compliance Officer, shall have sole discretion to decide whether to clear any contemplated transaction. All trades that are precleared must be effected within five business days of receipt of the preclearance, unless a specific exception has been granted by the Compliance Officer. A precleared trade (or any portion of a precleared trade) that has not been effected during the five-business day period must be precleared again prior to execution. Notwithstanding receipt of preclearance, if the Preclearance Person becomes aware of material nonpublic information or becomes subject to a blackout period before the transaction is effected, the transaction may not be completed.

None of the Company, the General Counsel or Chief Financial Officer, or the Company’s

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other employees will have any liability for any delay in reviewing, or refusal of, a request for preclearance submitted pursuant to this section. Pre-clearance should not be understood to represent legal advice by the Company that a proposed transaction complies with the law.  Notwithstanding any preclearance of a transaction pursuant to this section, none of the Company, the General Counsel or Chief Financial Officer, or the Company’s other employees assumes any liability for the legality or consequences of such transaction to the person engaging in such transaction.

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Exempt Transactions

This Policy, except for provisions set forth in the Prohibited Transactions section below, does not apply to:

Additional Prohibited Transactions

The Company has determined that there is a heightened legal risk and/or the appearance of improper or inappropriate conduct if the persons subject to this Policy engage in certain types of transactions. Therefore, officers, directors, and employees shall comply with the following policies with respect to certain transactions in the Company securities:

Short Sales

Short sales are sales of shares that the insider does not own at the time of sale, or sales of shares against which the insider does not deliver the shares within 20 days after the sale. Short sales of the Company’s securities evidence an expectation on the part of the seller that the securities will decline in value, and therefore signal to the market that the seller has no confidence in the Company or its short-term prospects. In addition, short sales may reduce the seller’s incentive to improve the Company’s performance. For these reasons, short sales of the Company’s securities are

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prohibited by this Policy. In addition, as noted below, Section 16(c) of the 1934 Act absolutely prohibits Section 16 reporting persons from making short sales of the Company’s equity securities.

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Publicly Traded Options

A transaction in options is, in effect, a bet on the short-term movement of the Company’s stock and therefore creates the appearance that an officer, director, or employee is trading based on material nonpublic information. Transactions in options may also focus an officer’s, director’s, or employee’s attention on short-term performance at the expense of the Company’s long-term objectives. Accordingly, transactions in puts, calls, or other derivative securities involving the Company’s equity securities, on an exchange, on an over-the-counter market, or in any other organized market, are prohibited by this Policy.

Hedging Transactions

Certain forms of hedging or monetization transactions, such as zero-cost collars and forward sale contracts, allow an officer, director, or employee to lock in much of the value of his or her stock holdings, often in exchange for all or part of the potential for upside appreciation in the stock. Such transactions allow the officer, director, or employee to continue to own the covered securities, but without the full risks and rewards of ownership. When that occurs, the officer, director, or employee may no longer have the same objectives as the Company’s other stockholders. Therefore, such transactions involving the Company’s equity securities are prohibited by this Policy.

Purchases of the Company’s Securities on Margin; Pledging the Company’s Securities to Secure Margin or Other Loans

Purchasing on margin means borrowing from a brokerage firm, bank, or other entity in order to purchase the Company’s securities (other than in connection with a cashless exercise of stock options under the Company’s equity plans). Margin purchases of the Company’s securities are prohibited by this Policy. Pledging the Company’s securities as collateral to secure loans is also prohibited. This prohibition means, among other things, that you cannot hold the Company’s securities in a “margin account” (which would allow you to borrow against your holdings to buy securities). This prohibition does not apply to cashless exercises of stock options under the Company’s equity plans.

Director and Executive Officer Cashless Exercises

The Company will not arrange with brokers to administer cashless exercises on behalf of directors and executive officers of the Company. Directors and executive officers of the Company may use the cashless exercise feature of their equity awards only if (i) the director or officer retains a broker independently of the Company, (ii) the Company’s involvement is limited to confirming that it will deliver the stock promptly upon payment of the exercise price, and (iii) the director or officer uses a cashless exercise arrangement, in which the Company agrees to deliver stock against the payment of the purchase price on the same day the sale of the stock underlying the equity award settles. Under a cashless exercise, a broker, the issuer, and the issuer’s transfer agent work together to make all transactions settle simultaneously. This approach is to avoid any inference that the

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Company has “extended credit” in the form of a personal loan to the director or executive officer. Questions about cashless exercises should be directed to the Compliance Officer.

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Partnership Distributions

Nothing in this Policy is intended to limit the ability of an investment fund, venture capital partnership or other similar entity with which a director is affiliated to distribute Company securities to its partners, members, or other similar persons. It is the responsibility of each affected director and the affiliated entity, in consultation with their own counsel (as appropriate), to determine the timing of any distributions, based on all relevant facts and circumstances, and applicable securities laws.

Rule 10b5-1 Trading Plans

The trading restrictions set forth do not apply to transactions under a previously established contract, plan, or instruction to trade in the Company’s stock in accordance with the terms of Rule 10b5-1 and all applicable state laws (a “Trading Plan”) that:

You may adopt more than one Trading Plan at a time. You may only amend or revoke a Trading Plan outside of quarterly trading blackout periods when you do not possess material nonpublic information. Any amendment or revocation of a Trading Plan must be preapproved by the Authorizing Officer at least 30 days before you trade under an amended or outside of a revoked Trading Plan, and at least 180 days before you establish a new Trading Plan.

The Company reserves the right to publicly announce, or respond to inquiries from the media regarding, the implementation of Trading Plans or the execution of transactions made under a Trading Plan. The Company also reserves the right from time to time to suspend, discontinue, or otherwise prohibit transactions under a Trading Plan if the Authorizing Officer or the Board of Directors, in its discretion, determines that such suspension, discontinuation, or other prohibition is in the best interests of the Company.

The cashless exercise of options under Trading Plans is permitted only through “same-day sales,” in which the option holder does not pay for the stock up front, but rather receives cash equal

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to the difference between the stock value and option exercise price. Transactions prohibited under this Policy, including short sales and hedging transactions, may not be carried out through a Trading Plan.

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Compliance of a Trading Plan with the terms of Rule 10b5-1 and the execution of transactions pursuant to the Trading Plan are the sole responsibility of the person initiating the Trading Plan, and none of the Company, the Authorizing Officer, or the Company’s other employees assume any liability for any delay in reviewing and/or refusing a Trading Plan submitted for approval nor the legality or consequences relating to a person entering into or trading under a Trading Plan.

Trading Plans do not exempt you from complying with Section 16 short-swing profit rules or liability.

During an open trading window, trades differing from Trading Plan instructions that are already in place are allowed as long as the Trading Plan continues to be followed.

Policy Administration

The Compliance Officer has authority to interpret, amend and implement this Policy. This authority includes interpreting or waiving the terms of this Policy, to the extent consistent with its general purpose and applicable securities laws. The Chief Financial Officer will administer this Policy as it applies to any trading activity by the Compliance Officer.

Post-Termination Transactions

With the exception of the preclearance requirement, this Policy continues to apply to transactions in the Company’s securities even after termination of service to the Company. If you are in possession of material nonpublic information when your service terminates, you may not trade in the Company’s securities until that information has become public or is no longer material.

Execution and Return of Certification of Compliance

After reading this Policy, all officers, directors, and employees should execute and return to the Company’s General Counsel the Certification of Compliance form attached hereto as “Attachment A” and may be asked periodically to certify their compliance with the terms and provisions of this Policy.  

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Approved by the Board of Directors on December 11, 2024

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Attachment A

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Certification of Compliance

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Return by [                        ] [insert return deadline]

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To:Bryan Rowland, General Counsel From:                                                       

Re:Insider Trading Compliance Policy of Vertex, Inc.

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I have received, reviewed, and understand the above-referenced Insider Trading Compliance Policy and undertake, as a condition to my present and continued employment (or, if I am not an employee, affiliation with) Vertex, Inc., to comply fully with the policies and procedures contained therein.

I hereby certify, to the best of my knowledge, that during the calendar year ending December 31, 20[ ], I have complied fully with all policies and procedures set forth in the above-referenced Insider Trading Compliance Policy.

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