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      <issuerAddress>
        <com:street1>2301 RENAISSANCE BOULEVARD</com:street1>
        <com:city>KING OF PRUSSIA</com:city>
        <com:stateOrCountry>PA</com:stateOrCountry>
        <com:zipCode>19406</com:zipCode>
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      <issuerContactPhone>(800) 355-3500</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>ITEM SECOND IRR. TRUST FBO JACOB J. WESTPHAL u/a of JEFFREY R. WESTPHAL dated October 5, 2001</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Member of immediate family of any of the foregoing</relationshipToIssuer>
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      <brokerOrMarketmakerDetails>
        <name>Charles Schwab &amp; Co. Inc.</name>
        <address>
          <com:street1>3000 schwab way</com:street1>
          <com:city>westlake</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>76262</com:zipCode>
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      <noOfUnitsSold>1000000</noOfUnitsSold>
      <aggregateMarketValue>33580000.00</aggregateMarketValue>
      <noOfUnitsOutstanding>61673585</noOfUnitsOutstanding>
      <approxSaleDate>03/01/2024</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
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      <securitiesClassTitle>class a</securitiesClassTitle>
      <acquiredDate>10/12/2023</acquiredDate>
      <natureOfAcquisitionTransaction>Stock Option Exercise</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>2089000</amountOfSecuritiesAcquired>
      <paymentDate>10/12/2023</paymentDate>
      <natureOfPayment>NA</natureOfPayment>
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    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
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      <sellerDetails>
        <name>Irrev Trust of Jeff Westphal FBO Jacob J Westphal</name>
        <address>
          <com:street1>825 Catherarine St</com:street1>
          <com:city>Philadelphia</com:city>
          <com:stateOrCountry>PA</com:stateOrCountry>
          <com:zipCode>19147</com:zipCode>
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      <securitiesClassTitle>class a</securitiesClassTitle>
      <saleDate>12/01/2023</saleDate>
      <amountOfSecuritiesSold>79200</amountOfSecuritiesSold>
      <grossProceeds>2199439.00</grossProceeds>
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    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Irrev Trust of Jeff Westphal FBO Jacob J Westphal</name>
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          <com:stateOrCountry>PA</com:stateOrCountry>
          <com:zipCode>19147</com:zipCode>
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      <securitiesClassTitle>class a</securitiesClassTitle>
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      <grossProceeds>422840.00</grossProceeds>
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          <com:zipCode>19147</com:zipCode>
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      <securitiesClassTitle>class a</securitiesClassTitle>
      <saleDate>12/05/2023</saleDate>
      <amountOfSecuritiesSold>26415</amountOfSecuritiesSold>
      <grossProceeds>782037.00</grossProceeds>
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    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Irrev Trust of Jeff Westphal FBO Jacob J Westphal</name>
        <address>
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          <com:stateOrCountry>PA</com:stateOrCountry>
          <com:zipCode>19147</com:zipCode>
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      <securitiesClassTitle>class a</securitiesClassTitle>
      <saleDate>12/06/2023</saleDate>
      <amountOfSecuritiesSold>21696</amountOfSecuritiesSold>
      <grossProceeds>638125.00</grossProceeds>
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    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Irrev Trust of Jeff Westphal FBO Jacob J Westphal</name>
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          <com:stateOrCountry>PA</com:stateOrCountry>
          <com:zipCode>19147</com:zipCode>
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      <securitiesClassTitle>class a</securitiesClassTitle>
      <saleDate>12/07/2023</saleDate>
      <amountOfSecuritiesSold>39553</amountOfSecuritiesSold>
      <grossProceeds>1134926.00</grossProceeds>
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          <com:stateOrCountry>PA</com:stateOrCountry>
          <com:zipCode>19147</com:zipCode>
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      <securitiesClassTitle>class a</securitiesClassTitle>
      <saleDate>12/08/2023</saleDate>
      <amountOfSecuritiesSold>50227</amountOfSecuritiesSold>
      <grossProceeds>1438999.00</grossProceeds>
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    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Irrev Trust of Jeff Westphal FBO Jacob J Westphal</name>
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          <com:stateOrCountry>PA</com:stateOrCountry>
          <com:zipCode>19147</com:zipCode>
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      </sellerDetails>
      <securitiesClassTitle>class a</securitiesClassTitle>
      <saleDate>12/11/2023</saleDate>
      <amountOfSecuritiesSold>49049</amountOfSecuritiesSold>
      <grossProceeds>1408663.00</grossProceeds>
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      <securitiesClassTitle>class a</securitiesClassTitle>
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      <amountOfSecuritiesSold>11400</amountOfSecuritiesSold>
      <grossProceeds>321197.00</grossProceeds>
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    <noticeSignature>
      <noticeDate>03/01/2024</noticeDate>
      <signature>Joshua Levine</signature>
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144
0001819296
XXXXXXXX
LIVE
0001806837
Vertex, Inc.
001-39413
2301 RENAISSANCE BOULEVARD
KING OF PRUSSIA
PA
19406
(800) 355-3500
ITEM SECOND IRR. TRUST FBO JACOB J. WESTPHAL u/a of JEFFREY R. WESTPHAL dated October 5, 2001
Member of immediate family of any of the foregoing
Class A
Charles Schwab & Co. Inc.
3000 schwab way
westlake
TX
76262
1000000
33580000.00
61673585
03/01/2024
NASDAQ
class a
10/12/2023
Stock Option Exercise
Issuer
N
2089000
10/12/2023
NA
N
Irrev Trust of Jeff Westphal FBO Jacob J Westphal
825 Catherarine St
Philadelphia
PA
19147
class a
12/01/2023
79200
2199439.00
Irrev Trust of Jeff Westphal FBO Jacob J Westphal
825 Catherarine St
Philadelphia
PA
19147
class a
12/04/2023
15200
422840.00
Irrev Trust of Jeff Westphal FBO Jacob J Westphal
825 Catharine St
Philadelphia
PA
19147
class a
12/05/2023
26415
782037.00
Irrev Trust of Jeff Westphal FBO Jacob J Westphal
825 catherarine st
philadelphia
PA
19147
class a
12/06/2023
21696
638125.00
Irrev Trust of Jeff Westphal FBO Jacob J Westphal
825 catherarine st
philadelphia
PA
19147
class a
12/07/2023
39553
1134926.00
Irrev Trust of Jeff Westphal FBO Jacob J Westphal
825 catharine st
philadelphia
PA
19147
class a
12/08/2023
50227
1438999.00
Irrev Trust of Jeff Westphal FBO Jacob J Westphal
825 catharine st
philadelphia
PA
19147
class a
12/11/2023
49049
1408663.00
Irrev Trust of Jeff Westphal FBO Jacob J Westphal
825 catharine st
philadelphia
PA
19147
class a
12/12/2023
49199
1422402.00
Irrev Trust of Jeff Westphal FBO Jacob J Westphal
825 catharine st
philadelphia
PA
19147
class a
12/13/2023
11400
321197.00
03/01/2024
Joshua Levine