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    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001299455</cik>
          <ccc>XXXXXXXX</ccc>
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      <liveTestFlag>LIVE</liveTestFlag>



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    <issuerInfo>
      <issuerCik>0001666134</issuerCik>
      <issuerName>BLACKLINE, INC.</issuerName>
      <secFileNumber>001-37924</secFileNumber>
      <issuerAddress>
        <com:street1>21300 VICTORY BOULEVARD</com:street1>
        <com:street2>12TH FLOOR</com:street2>
        <com:city>WOODLAND HILLS</com:city>
        <com:stateOrCountry>CA</com:stateOrCountry>
        <com:zipCode>91367</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>818-223-9008</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Unterman Thomas</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Director</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>750</noOfUnitsSold>
      <aggregateMarketValue>49905.00</aggregateMarketValue>
      <noOfUnitsOutstanding>60047142</noOfUnitsOutstanding>
      <approxSaleDate>04/03/2023</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>07/01/2021</acquiredDate>
      <natureOfAcquisitionTransaction>Stock Option Exercise</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>273</amountOfSecuritiesAcquired>
      <paymentDate>07/01/2021</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>08/02/2021</acquiredDate>
      <natureOfAcquisitionTransaction>Stock Option Exercise</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>477</amountOfSecuritiesAcquired>
      <paymentDate>08/02/2021</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>THOMAS UNTERMAN</name>
        <address>
          <com:street1>21300 Victory Boulevard</com:street1>
          <com:street2>12th Floor</com:street2>
          <com:city>Woodland Hills</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>91367</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>01/03/2023</saleDate>
      <amountOfSecuritiesSold>500</amountOfSecuritiesSold>
      <grossProceeds>34250.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>THOMAS UNTERMAN</name>
        <address>
          <com:street1>21300 Victory Boulevard</com:street1>
          <com:street2>12th Floor</com:street2>
          <com:city>Woodland Hills</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>91367</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>02/01/2023</saleDate>
      <amountOfSecuritiesSold>500</amountOfSecuritiesSold>
      <grossProceeds>35900.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>THOMAS UNTERMAN</name>
        <address>
          <com:street1>21300 Victory Boulevard</com:street1>
          <com:street2>12th Floor</com:street2>
          <com:city>Woodland Hills</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>91367</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>03/01/2023</saleDate>
      <amountOfSecuritiesSold>448</amountOfSecuritiesSold>
      <grossProceeds>30602.88</grossProceeds>
    </securitiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>04/03/2023</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>12/12/2022</planAdoptionDate>
      </planAdoptionDates>
      <signature>/s/ Lisa Gerard, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Thomas Unterman</signature>
    </noticeSignature>
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144
0001299455
XXXXXXXX
LIVE
0001666134
BLACKLINE, INC.
001-37924
21300 VICTORY BOULEVARD
12TH FLOOR
WOODLAND HILLS
CA
91367
818-223-9008
Unterman Thomas
Director
Common
Fidelity Brokerage Services LLC
900 Salem Street
Smithfield
RI
02917
750
49905.00
60047142
04/03/2023
NASDAQ
Common
07/01/2021
Stock Option Exercise
Issuer
N
273
07/01/2021
Cash
Common
08/02/2021
Stock Option Exercise
Issuer
N
477
08/02/2021
Cash
N
THOMAS UNTERMAN
21300 Victory Boulevard
12th Floor
Woodland Hills
CA
91367
Common
01/03/2023
500
34250.00
THOMAS UNTERMAN
21300 Victory Boulevard
12th Floor
Woodland Hills
CA
91367
Common
02/01/2023
500
35900.00
THOMAS UNTERMAN
21300 Victory Boulevard
12th Floor
Woodland Hills
CA
91367
Common
03/01/2023
448
30602.88
04/03/2023
12/12/2022
/s/ Lisa Gerard, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Thomas Unterman