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The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares purchased at each separate price."}],"balance_after":397740,"source":{"system":"sec-edgar","filing":"0001104659-26-017154","document":"tm266765-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1818851/000110465926017154/tm266765-1_4seq1.xml","form_type":"4"}},{"id":897110,"issuer":{"id":4427,"kind":"organization","name":"Vertex, Inc.","symbol":"VERX"},"owners":[{"id":65912,"kind":"person","name":"Westphal Jeffrey","position":1,"cik":"0001818851","reported_name":"Westphal Jeffrey","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Remarks"}}],"security":"Class A Common Stock","published_at":"2026-02-18T17:22:20.000Z","date":"2026-02-13","kind":"purchase","planned":false,"acquired":true,"shares":247740,"price":13.0825,"value":3241058.55,"ownership":{"direct":false,"nature":"By The 2009 Jeffrey R. 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The Class B Common Stock will automatically convert into shares of the Issuer's Class A Common Stock on a one-to-one basis either (1) upon any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (2) if the voting power of the Issuer's outstanding Class B Common Stock represents less than 10% of the combined voting power of all of the Issuer's outstanding common stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Class B Common Stock is convertible at any time at the option of the holder into one share of the Issuer's Class A Common Stock and has no expiration date. 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The Reporting Person undertakes to provide to the Issuer, any securityholder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above."}],"balance_after":12461420,"source":{"system":"sec-edgar","filing":"0001415889-22-005657","document":"form4-05252022_010505.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818851/000141588922005657/form4-05252022_010505.xml","form_type":"4"}},{"id":2436061,"issuer":{"id":4427,"kind":"organization","name":"Vertex, Inc.","symbol":"VERX"},"owners":[{"id":65912,"kind":"person","name":"Westphal Jeffrey","position":1,"cik":"0001818851","reported_name":"Westphal Jeffery","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2022-01-13T15:41:43.000Z","date":"2022-01-11","kind":"sale","acquired":false,"shares":800000,"price":14.6,"value":11680000.0,"ownership":{"direct":false,"nature":"By The 2009 Jeffrey R. 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The Class B Common Stock will automatically convert into shares of the Issuer's Class A Common Stock on a one-to-one basis upon either (1) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (2) the voting power of the Issuer's outstanding Class B Common Stock representing less than 10% of the combined voing power of all of the Issuer's outstanding common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The Class B Common Stock is convertible at any time at the option of the holder into one share of the Issuer's Class A Common Stock and has no expiration date. The Class B Common Stock will automatically convert into shares of the Issuer's Class A Common Stock on a one-to-one basis upon either (1) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (2) the voting power of the Issuer's outstanding Class B Common Stock representing less than 10% of the combined voing power of all of the Issuer's outstanding common stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The Class B Common Stock is convertible at any time at the option of the holder into one share of the Issuer's Class A Common Stock and has no expiration date. The Class B Common Stock will automatically convert into shares of the Issuer's Class A Common Stock on a one-to-one basis upon either (1) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (2) the voting power of the Issuer's outstanding Class B Common Stock representing less than 10% of the combined voing power of all of the Issuer's outstanding common stock."}],"balance_after":14749286.237,"derivative":{"underlying":"Class A Common Stock","underlying_shares":1210000},"source":{"system":"sec-edgar","filing":"0001415889-21-005618","document":"form4-12012021_011220.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1818851/000141588921005618/form4-12012021_011220.xml","form_type":"4"}},{"id":2490736,"issuer":{"id":4427,"kind":"organization","name":"Vertex, Inc.","symbol":"VERX"},"owners":[{"id":65912,"kind":"person","name":"Westphal Jeffrey","position":1,"cik":"0001818851","reported_name":"Westphal Jeffery","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2021-12-01T16:39:26.000Z","date":"2021-11-30","kind":"exercise","acquired":true,"shares":1210000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By The 2009 Jeffrey R. 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The Class B Common Stock will automatically convert into shares of the Issuer's Class A Common Stock on a one-to-one basis upon either (1) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (2) the voting power of the Issuer's outstanding Class B Common Stock representing less than 10% of the combined voing power of all of the Issuer's outstanding common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The Class B Common Stock is convertible at any time at the option of the holder into one share of the Issuer's Class A Common Stock and has no expiration date. The Class B Common Stock will automatically convert into shares of the Issuer's Class A Common Stock on a one-to-one basis upon either (1) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (2) the voting power of the Issuer's outstanding Class B Common Stock representing less than 10% of the combined voing power of all of the Issuer's outstanding common stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The Class B Common Stock is convertible at any time at the option of the holder into one share of the Issuer's Class A Common Stock and has no expiration date. The Class B Common Stock will automatically convert into shares of the Issuer's Class A Common Stock on a one-to-one basis upon either (1) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (2) the voting power of the Issuer's outstanding Class B Common Stock representing less than 10% of the combined voing power of all of the Issuer's outstanding common stock."}],"balance_after":15959286.237,"derivative":{"underlying":"Class A Common Stock","underlying_shares":12100000},"source":{"system":"sec-edgar","filing":"0001104659-21-064672","document":"tm2115866-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1818851/000110465921064672/tm2115866-1_4seq1.xml","form_type":"4"}},{"id":2718891,"issuer":{"id":4427,"kind":"organization","name":"Vertex, Inc.","symbol":"VERX"},"owners":[{"id":65912,"kind":"person","name":"Westphal Jeffrey","position":1,"cik":"0001818851","reported_name":"Westphal Jeffery","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2021-05-11T17:35:58.000Z","date":"2021-05-07","kind":"exercise","acquired":true,"shares":12100000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By The 2009 Jeffrey R. Westphal Generation Skipping Trust"},"balance_after":12100000,"source":{"system":"sec-edgar","filing":"0001104659-21-064672","document":"tm2115866-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818851/000110465921064672/tm2115866-1_4seq1.xml","form_type":"4"}},{"id":2866936,"issuer":{"id":4427,"kind":"organization","name":"Vertex, Inc.","symbol":"VERX"},"owners":[{"id":65912,"kind":"person","name":"Westphal Jeffrey","position":1,"cik":"0001818851","reported_name":"Westphal Jeffery","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2021-02-11T16:30:48.000Z","date":"2020-12-30","kind":"gift","acquired":false,"shares":300000,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":7895,"source":{"system":"sec-edgar","filing":"0001104659-21-020729","document":"tm215882-2_5seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818851/000110465921020729/tm215882-2_5seq1.xml","form_type":"5"}},{"id":2925899,"issuer":{"id":4427,"kind":"organization","name":"Vertex, Inc.","symbol":"VERX"},"owners":[{"id":65912,"kind":"person","name":"Westphal Jeffrey","position":1,"cik":"0001818851","reported_name":"Westphal Jeffery","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2021-01-04T16:31:47.000Z","date":"2020-12-30","kind":"exercise","acquired":false,"shares":300000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"The Class B Common Stock is convertible at any time at the option of the holder into one share of the Issuer's Class A Common Stock and has no expiration date. The Class B Common Stock will automatically convert into shares of the Issuer's Class A Common Stock on a one-to-one basis upon either (1) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (2) the voting power of the Issuer's outstanding Class B Common Stock representing less than 10% of the combined voing power of all of the Issuer's outstanding common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Class B Common Stock is convertible at any time at the option of the holder into one share of the Issuer's Class A Common Stock and has no expiration date. The Class B Common Stock will automatically convert into shares of the Issuer's Class A Common Stock on a one-to-one basis upon either (1) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (2) the voting power of the Issuer's outstanding Class B Common Stock representing less than 10% of the combined voing power of all of the Issuer's outstanding common stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Class B Common Stock is convertible at any time at the option of the holder into one share of the Issuer's Class A Common Stock and has no expiration date. The Class B Common Stock will automatically convert into shares of the Issuer's Class A Common Stock on a one-to-one basis upon either (1) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (2) the voting power of the Issuer's outstanding Class B Common Stock representing less than 10% of the combined voing power of all of the Issuer's outstanding common stock."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F3","text":"Acquired from the Irrevocable Trust of Rainer J. Westphal, Settlor, dated July 19, 2007 - Separate Trust for Benefit of Jeffrey Westphal in a series of transactions exempt from reporting under Rule 16a-13."}],"balance_after":49000,"derivative":{"underlying":"Class A Common Stock","underlying_shares":300000},"source":{"system":"sec-edgar","filing":"0001104659-21-000347","document":"tm2039692-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1818851/000110465921000347/tm2039692-1_4seq1.xml","form_type":"4"}},{"id":2925898,"issuer":{"id":4427,"kind":"organization","name":"Vertex, Inc.","symbol":"VERX"},"owners":[{"id":65912,"kind":"person","name":"Westphal Jeffrey","position":1,"cik":"0001818851","reported_name":"Westphal Jeffery","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2021-01-04T16:31:47.000Z","date":"2020-12-30","kind":"exercise","acquired":true,"shares":300000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares of Class A Common Stock reported herein remain subject to a lock-up agreement with the underwriters for the Issuer's initial public offering."}],"balance_after":307895,"source":{"system":"sec-edgar","filing":"0001104659-21-000347","document":"tm2039692-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818851/000110465921000347/tm2039692-1_4seq1.xml","form_type":"4"}}]}