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      <filer>
        <filerCredentials>
          <cik>0001232979</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



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    <issuerInfo>
      <issuerCik>0001005284</issuerCik>
      <issuerName>UNIVERSAL DISPLAY CORP \PA\</issuerName>
      <secFileNumber>001-12031</secFileNumber>
      <issuerAddress>
        <com:street1>250 PHILLIPS BOULEVARD</com:street1>
        <com:city>EWING</com:city>
        <com:stateOrCountry>NJ</com:stateOrCountry>
        <com:zipCode>08618</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>6096710980</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>BROWN JULIA J</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Fidelity Brokerage Services LLC</name>
        <address>
          <com:street1>900 Salem Street</com:street1>
          <com:city>Smithfield</com:city>
          <com:stateOrCountry>RI</com:stateOrCountry>
          <com:zipCode>02917</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>5214</noOfUnitsSold>
      <aggregateMarketValue>784779.63</aggregateMarketValue>
      <noOfUnitsOutstanding>47334131</noOfUnitsOutstanding>
      <approxSaleDate>06/07/2023</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>03/31/2020</acquiredDate>
      <natureOfAcquisitionTransaction>ESPP Purchase</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>110</amountOfSecuritiesAcquired>
      <paymentDate>03/31/2020</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>06/30/2020</acquiredDate>
      <natureOfAcquisitionTransaction>ESPP Purchase</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>18</amountOfSecuritiesAcquired>
      <paymentDate>06/30/2020</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>03/05/2021</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>424</amountOfSecuritiesAcquired>
      <paymentDate>03/05/2021</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>03/06/2021</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>4662</amountOfSecuritiesAcquired>
      <paymentDate>03/06/2021</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>06/07/2023</noticeDate>
      <signature>/s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Julia Brown</signature>
    </noticeSignature>
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144
0001232979
XXXXXXXX
LIVE
0001005284
UNIVERSAL DISPLAY CORP \PA\
001-12031
250 PHILLIPS BOULEVARD
EWING
NJ
08618
6096710980
BROWN JULIA J
Officer
Common
Fidelity Brokerage Services LLC
900 Salem Street
Smithfield
RI
02917
5214
784779.63
47334131
06/07/2023
NASDAQ
Common
03/31/2020
ESPP Purchase
Issuer
N
110
03/31/2020
Cash
Common
06/30/2020
ESPP Purchase
Issuer
N
18
06/30/2020
Cash
Common
03/05/2021
Restricted Stock Vesting
Issuer
N
424
03/05/2021
Compensation
Common
03/06/2021
Restricted Stock Vesting
Issuer
N
4662
03/06/2021
Compensation
Y
06/07/2023
/s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Julia Brown