Vertex, Inc.

$150 Million Class A Common Stock Repurchase Program

On October 30, 2025, as part of the Company's capital allocation strategy to maximize long-term stockholder value, the Company’s Board of Directors authorized a stock repurchase program, which will enable the Company to repurchase up to $150 million of the Company's outstanding shares of Class A common stock. Under the program, share repurchases may be made from time to time in one or more open market or privately negotiated transactions, and/or through other legally permissible means in accordance with applicable rules and regulations promulgated under the Securities Exchange Act of 1934, as amended.

The timing and amount of any shares repurchased will be determined by the Company's management based on its evaluation of market conditions and other factors. Repurchases may also be made under a Rule 10b5-1 plan, which would permit shares to be repurchased when the Company might otherwise be precluded from doing so under insider trading laws. Any repurchased shares will be available for use in connection with the Company’s stock plans and for other corporate purposes. This repurchase program has no termination date and may be modified, suspended or discontinued at any time.