Exhibit 16.1
May 12, 2020
Securities and Exchange Commission
100 F Street, N.E.
Washington, DC 20549
Ladies and Gentlemen:
We have read the disclosure set forth under the caption “Change in Independent Accountant” in the Registration Statement on Form S-1 of Vertex, Inc. dated May 12, 2020 and are in agreement with the statements contained therein insofar as they relate to our Firm. We have no basis to agree or disagree with other statements of Vertex, Inc. contained therein.
Baker Tilly Virchow Krause, LLP
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