content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
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      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001208906</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0001846253</issuerCik>
        <issuerName>OmniAb, Inc.</issuerName>
        <secFileNumber>001-40720</secFileNumber>
        <issuerAddress>
          <com:street1>5980 HORTON STREET</com:street1>
          <com:street2>SUITE 600</com:street2>
          <com:city>EMERYVILLE</com:city>
          <com:stateOrCountry>MN</com:stateOrCountry>
          <com:zipCode>94608</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>510-250-7800</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>HIGGINS JOHN L</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Director</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Piper Sandler &amp; Co.</name>
          <address>
            <com:street1>800 Nicollet Mall</com:street1>
            <com:city>Minneapolis</com:city>
            <com:stateOrCountry>MN</com:stateOrCountry>
            <com:zipCode>55402</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>61362</noOfUnitsSold>
        <aggregateMarketValue>238084.60</aggregateMarketValue>
        <noOfUnitsOutstanding>115060000</noOfUnitsOutstanding>
        <approxSaleDate>05/18/2023</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>common</securitiesClassTitle>
        <acquiredDate>05/18/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Stock Option Exercise</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>50000</amountOfSecuritiesAcquired>
        <paymentDate>05/18/2023</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>05/18/2023</noticeDate>
        <signature>/s/ Linda Moran, as a duly auth rep of Piper Sandler &amp; Co Corporate &amp; Venture Services FA, as attorney-in-fact for John Higgins</signature>
      </noticeSignature>
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text: 144
  0001208906
  XXXXXXXX
  LIVE
  0001846253
  OmniAb, Inc.
  001-40720
  5980 HORTON STREET
  SUITE 600
  EMERYVILLE
  MN
  94608
  510-250-7800
  HIGGINS JOHN L
  Director
  common
  Piper Sandler & Co.
  800 Nicollet Mall
  Minneapolis
  MN
  55402
  61362
  238084.60
  115060000
  05/18/2023
  NASDAQ
  common
  05/18/2023
  Stock Option Exercise
  Issuer
  N
  50000
  05/18/2023
  Cash
  Y
  05/18/2023
  /s/ Linda Moran, as a duly auth rep of Piper Sandler & Co Corporate & Venture Services FA, as attorney-in-fact for John Higgins