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  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001578147</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0001114995</issuerCik>
      <issuerName>IMPINJ INC</issuerName>
      <secFileNumber>001-37824</secFileNumber>
      <issuerAddress>
        <com:street1>400 FAIRVIEW AVENUE NORTH</com:street1>
        <com:street2>SUITE 1200</com:street2>
        <com:city>SEATTLE</com:city>
        <com:stateOrCountry>WA</com:stateOrCountry>
        <com:zipCode>98109</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>206-517-5300</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>DOSSETT JEFFREY</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <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>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>10500</noOfUnitsSold>
      <aggregateMarketValue>1397767.00</aggregateMarketValue>
      <noOfUnitsOutstanding>26157089</noOfUnitsOutstanding>
      <approxSaleDate>03/01/2023</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>02/11/2022</acquiredDate>
      <natureOfAcquisitionTransaction>Performance Stock Lapse - See Remarks</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>IMPINJ, INC.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>10500</amountOfSecuritiesAcquired>
      <paymentDate>02/11/2022</paymentDate>
      <natureOfPayment>Equity Compensation</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>JEFF DOSSETT</name>
        <address>
          <com:street1>400 Fairview Avenue North, Suite 1200</com:street1>
          <com:city>Seattle</com:city>
          <com:stateOrCountry>WA</com:stateOrCountry>
          <com:zipCode>98109</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>IMPINJ, INC.</securitiesClassTitle>
      <saleDate>12/01/2022</saleDate>
      <amountOfSecuritiesSold>2000</amountOfSecuritiesSold>
      <grossProceeds>255100.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>JEFF DOSSETT</name>
        <address>
          <com:street1>400 Fairview Avenue North, Suite 1200,</com:street1>
          <com:city>Seattle</com:city>
          <com:stateOrCountry>WA</com:stateOrCountry>
          <com:zipCode>98109</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>IMPINJ, INC.</securitiesClassTitle>
      <saleDate>12/16/2022</saleDate>
      <amountOfSecuritiesSold>734</amountOfSecuritiesSold>
      <grossProceeds>80585.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>JEFF DOSSETT</name>
        <address>
          <com:street1>400 Fairview Avenue North, Suite 1200,</com:street1>
          <com:city>Seattle</com:city>
          <com:stateOrCountry>WA</com:stateOrCountry>
          <com:zipCode>98109</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>IMPINJ, INC.</securitiesClassTitle>
      <saleDate>01/03/2023</saleDate>
      <amountOfSecuritiesSold>2000</amountOfSecuritiesSold>
      <grossProceeds>221620.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>JEFF DOSSETT</name>
        <address>
          <com:street1>400 Fairview Avenue North, Suite 1200,</com:street1>
          <com:city>Seattle</com:city>
          <com:stateOrCountry>WA</com:stateOrCountry>
          <com:zipCode>98109</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>IMPINJ, INC.</securitiesClassTitle>
      <saleDate>01/13/2023</saleDate>
      <amountOfSecuritiesSold>563</amountOfSecuritiesSold>
      <grossProceeds>67873.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>JEFF DOSSETT</name>
        <address>
          <com:street1>400 Fairview Avenue North, Suite 1200</com:street1>
          <com:city>Seattle</com:city>
          <com:stateOrCountry>WA</com:stateOrCountry>
          <com:zipCode>98109</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>IMPINJ, INC.</securitiesClassTitle>
      <saleDate>02/01/2023</saleDate>
      <amountOfSecuritiesSold>598</amountOfSecuritiesSold>
      <grossProceeds>79611.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>JEFF DOSSETT</name>
        <address>
          <com:street1>400 Fairview Avenue North, Suite 1200</com:street1>
          <com:city>Seattle</com:city>
          <com:stateOrCountry>WA</com:stateOrCountry>
          <com:zipCode>98109</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>IMPINJ, INC.</securitiesClassTitle>
      <saleDate>02/10/2023</saleDate>
      <amountOfSecuritiesSold>3500</amountOfSecuritiesSold>
      <grossProceeds>427910.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>JEFF DOSSETT</name>
        <address>
          <com:street1>400 Fairview Avenue North, Suite 1200,</com:street1>
          <com:city>Seattle</com:city>
          <com:stateOrCountry>WA</com:stateOrCountry>
          <com:zipCode>98109</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>IMPINJ, INC.</securitiesClassTitle>
      <saleDate>02/27/2023</saleDate>
      <amountOfSecuritiesSold>5143</amountOfSecuritiesSold>
      <grossProceeds>656839.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <remarks>The securities that may be sold under this filing were acquired and paid for 02/11/2022</remarks>
    <noticeSignature>
      <noticeDate>03/01/2023</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>10/28/2022</planAdoptionDate>
      </planAdoptionDates>
      <signature>JEFF DOSSETT</signature>
    </noticeSignature>
  </formData>
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144
0001578147
XXXXXXXX
LIVE
0001114995
IMPINJ INC
001-37824
400 FAIRVIEW AVENUE NORTH
SUITE 1200
SEATTLE
WA
98109
206-517-5300
DOSSETT JEFFREY
Officer
Common
Charles Schwab & Co., Inc.
3000 Schwab Way
Westlake
TX
76262
10500
1397767.00
26157089
03/01/2023
NASDAQ
Common
02/11/2022
Performance Stock Lapse - See Remarks
IMPINJ, INC.
N
10500
02/11/2022
Equity Compensation
N
JEFF DOSSETT
400 Fairview Avenue North, Suite 1200
Seattle
WA
98109
IMPINJ, INC.
12/01/2022
2000
255100.00
JEFF DOSSETT
400 Fairview Avenue North, Suite 1200,
Seattle
WA
98109
IMPINJ, INC.
12/16/2022
734
80585.00
JEFF DOSSETT
400 Fairview Avenue North, Suite 1200,
Seattle
WA
98109
IMPINJ, INC.
01/03/2023
2000
221620.00
JEFF DOSSETT
400 Fairview Avenue North, Suite 1200,
Seattle
WA
98109
IMPINJ, INC.
01/13/2023
563
67873.00
JEFF DOSSETT
400 Fairview Avenue North, Suite 1200
Seattle
WA
98109
IMPINJ, INC.
02/01/2023
598
79611.00
JEFF DOSSETT
400 Fairview Avenue North, Suite 1200
Seattle
WA
98109
IMPINJ, INC.
02/10/2023
3500
427910.00
JEFF DOSSETT
400 Fairview Avenue North, Suite 1200,
Seattle
WA
98109
IMPINJ, INC.
02/27/2023
5143
656839.00
The securities that may be sold under this filing were acquired and paid for 02/11/2022
03/01/2023
10/28/2022
JEFF DOSSETT