content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
    <headerData>
      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001343486</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0001521951</issuerCik>
        <issuerName>FIRST BUSINESS FINANCIAL SERVICES, INC.</issuerName>
        <secFileNumber>001-34095</secFileNumber>
        <issuerAddress>
          <com:street1>401 CHARMANY DRIVE</com:street1>
          <com:city>MADISON</com:city>
          <com:stateOrCountry>WI</com:stateOrCountry>
          <com:zipCode>53719</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>608-238-8008</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Sanders Carol P</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Director</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>LPL Financial</name>
          <address>
            <com:street1>1055 LPL Way</com:street1>
            <com:city>Fort Mill</com:city>
            <com:stateOrCountry>SC</com:stateOrCountry>
            <com:zipCode>29715</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>8881</noOfUnitsSold>
        <aggregateMarketValue>446270.25</aggregateMarketValue>
        <noOfUnitsOutstanding>8295017</noOfUnitsOutstanding>
        <approxSaleDate>12/13/2024</approxSaleDate>
        <securitiesExchangeName>Nasdaq</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>05/18/2017</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>214</amountOfSecuritiesAcquired>
        <paymentDate>05/18/2017</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/08/2017</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>231</amountOfSecuritiesAcquired>
        <paymentDate>08/08/2017</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>10/31/2017</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>225</amountOfSecuritiesAcquired>
        <paymentDate>10/31/2017</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>02/01/2018</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>205</amountOfSecuritiesAcquired>
        <paymentDate>02/01/2018</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>05/07/2018</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>192</amountOfSecuritiesAcquired>
        <paymentDate>05/07/2018</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/01/2018</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>200</amountOfSecuritiesAcquired>
        <paymentDate>08/01/2018</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>10/30/2018</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>240</amountOfSecuritiesAcquired>
        <paymentDate>10/30/2018</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>04/30/2019</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>258</amountOfSecuritiesAcquired>
        <paymentDate>04/30/2019</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>07/30/2019</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>249</amountOfSecuritiesAcquired>
        <paymentDate>07/30/2019</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>10/29/2019</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>245</amountOfSecuritiesAcquired>
        <paymentDate>10/29/2019</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>01/28/2020</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>563</amountOfSecuritiesAcquired>
        <paymentDate>01/28/2020</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>03/02/2020</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>460</amountOfSecuritiesAcquired>
        <paymentDate>03/02/2020</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>04/28/2020</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>358</amountOfSecuritiesAcquired>
        <paymentDate>04/28/2020</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>07/28/2020</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>413</amountOfSecuritiesAcquired>
        <paymentDate>07/28/2020</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>10/27/2020</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>356</amountOfSecuritiesAcquired>
        <paymentDate>10/27/2020</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>11/13/2020</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1375</amountOfSecuritiesAcquired>
        <paymentDate>11/13/2020</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>02/02/2021</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>315</amountOfSecuritiesAcquired>
        <paymentDate>02/02/2021</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>05/04/2021</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>250</amountOfSecuritiesAcquired>
        <paymentDate>05/04/2021</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/03/2021</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>219</amountOfSecuritiesAcquired>
        <paymentDate>08/03/2021</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>11/02/2021</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>260</amountOfSecuritiesAcquired>
        <paymentDate>11/02/2021</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>03/09/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>190</amountOfSecuritiesAcquired>
        <paymentDate>03/09/2022</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>05/05/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>171</amountOfSecuritiesAcquired>
        <paymentDate>05/05/2022</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/04/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>181</amountOfSecuritiesAcquired>
        <paymentDate>08/04/2022</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>11/01/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>157</amountOfSecuritiesAcquired>
        <paymentDate>11/01/2022</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>01/31/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>172</amountOfSecuritiesAcquired>
        <paymentDate>01/31/2023</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>05/02/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>218</amountOfSecuritiesAcquired>
        <paymentDate>05/02/2023</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/01/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>177</amountOfSecuritiesAcquired>
        <paymentDate>08/01/2023</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>10/31/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1</amountOfSecuritiesAcquired>
        <paymentDate>10/31/2023</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>10/31/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>192</amountOfSecuritiesAcquired>
        <paymentDate>10/31/2023</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>01/30/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>6</amountOfSecuritiesAcquired>
        <paymentDate>01/30/2024</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>01/30/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>35</amountOfSecuritiesAcquired>
        <paymentDate>01/30/2024</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>01/30/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>115</amountOfSecuritiesAcquired>
        <paymentDate>01/30/2024</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>05/01/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>75</amountOfSecuritiesAcquired>
        <paymentDate>05/01/2024</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>05/01/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>100</amountOfSecuritiesAcquired>
        <paymentDate>05/01/2024</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>07/30/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>129</amountOfSecuritiesAcquired>
        <paymentDate>07/30/2024</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>10/30/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>32</amountOfSecuritiesAcquired>
        <paymentDate>10/30/2024</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>10/30/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open Market Purchaser</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>102</amountOfSecuritiesAcquired>
        <paymentDate>10/30/2024</paymentDate>
        <natureOfPayment>Cash Consideration</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>12/13/2024</noticeDate>
        <signature>Carol P. Sanders</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 22667}]
text: 144
  0001343486
  XXXXXXXX
  LIVE
  0001521951
  FIRST BUSINESS FINANCIAL SERVICES, INC.
  001-34095
  401 CHARMANY DRIVE
  MADISON
  WI
  53719
  608-238-8008
  Sanders Carol P
  Director
  Common
  LPL Financial
  1055 LPL Way
  Fort Mill
  SC
  29715
  8881
  446270.25
  8295017
  12/13/2024
  Nasdaq
  Common
  05/18/2017
  Open Market Purchase
  Open Market Purchaser
  N
  214
  05/18/2017
  Cash Consideration
  Common
  08/08/2017
  Open Market Purchase
  Open Market Purchaser
  N
  231
  08/08/2017
  Cash Consideration
  Common
  10/31/2017
  Open Market Purchase
  Open Market Purchaser
  N
  225
  10/31/2017
  Cash Consideration
  Common
  02/01/2018
  Open Market Purchase
  Open Market Purchaser
  N
  205
  02/01/2018
  Cash Consideration
  Common
  05/07/2018
  Open Market Purchase
  Open Market Purchaser
  N
  192
  05/07/2018
  Cash Consideration
  Common
  08/01/2018
  Open Market Purchase
  Open Market Purchaser
  N
  200
  08/01/2018
  Cash Consideration
  Common
  10/30/2018
  Open Market Purchase
  Open Market Purchaser
  N
  240
  10/30/2018
  Cash Consideration
  Common
  04/30/2019
  Open Market Purchase
  Open Market Purchaser
  N
  258
  04/30/2019
  Cash Consideration
  Common
  07/30/2019
  Open Market Purchase
  Open Market Purchaser
  N
  249
  07/30/2019
  Cash Consideration
  Common
  10/29/2019
  Open Market Purchase
  Open Market Purchaser
  N
  245
  10/29/2019
  Cash Consideration
  Common
  01/28/2020
  Open Market Purchase
  Open Market Purchaser
  N
  563
  01/28/2020
  Cash Consideration
  Common
  03/02/2020
  Open Market Purchase
  Open Market Purchaser
  N
  460
  03/02/2020
  Cash Consideration
  Common
  04/28/2020
  Open Market Purchase
  Open Market Purchaser
  N
  358
  04/28/2020
  Cash Consideration
  Common
  07/28/2020
  Open Market Purchase
  Open Market Purchaser
  N
  413
  07/28/2020
  Cash Consideration
  Common
  10/27/2020
  Open Market Purchase
  Open Market Purchaser
  N
  356
  10/27/2020
  Cash Consideration
  Common
  11/13/2020
  Open Market Purchase
  Open Market Purchaser
  N
  1375
  11/13/2020
  Cash Consideration
  Common
  02/02/2021
  Open Market Purchase
  Open Market Purchaser
  N
  315
  02/02/2021
  Cash Consideration
  Common
  05/04/2021
  Open Market Purchase
  Open Market Purchaser
  N
  250
  05/04/2021
  Cash Consideration
  Common
  08/03/2021
  Open Market Purchase
  Open Market Purchaser
  N
  219
  08/03/2021
  Cash Consideration
  Common
  11/02/2021
  Open Market Purchase
  Open Market Purchaser
  N
  260
  11/02/2021
  Cash Consideration
  Common
  03/09/2022
  Open Market Purchase
  Open Market Purchaser
  N
  190
  03/09/2022
  Cash Consideration
  Common
  05/05/2022
  Open Market Purchase
  Open Market Purchaser
  N
  171
  05/05/2022
  Cash Consideration
  Common
  08/04/2022
  Open Market Purchase
  Open Market Purchaser
  N
  181
  08/04/2022
  Cash Consideration
  Common
  11/01/2022
  Open Market Purchase
  Open Market Purchaser
  N
  157
  11/01/2022
  Cash Consideration
  Common
  01/31/2023
  Open Market Purchase
  Open Market Purchaser
  N
  172
  01/31/2023
  Cash Consideration
  Common
  05/02/2023
  Open Market Purchase
  Open Market Purchaser
  N
  218
  05/02/2023
  Cash Consideration
  Common
  08/01/2023
  Open Market Purchase
  Open Market Purchaser
  N
  177
  08/01/2023
  Cash Consideration
  Common
  10/31/2023
  Open Market Purchase
  Open Market Purchaser
  N
  1
  10/31/2023
  Cash Consideration
  Common
  10/31/2023
  Open Market Purchase
  Open Market Purchaser
  N
  192
  10/31/2023
  Cash Consideration
  Common
  01/30/2024
  Open Market Purchase
  Open Market Purchaser
  N
  6
  01/30/2024
  Cash Consideration
  Common
  01/30/2024
  Open Market Purchase
  Open Market Purchaser
  N
  35
  01/30/2024
  Cash Consideration
  Common
  01/30/2024
  Open Market Purchase
  Open Market Purchaser
  N
  115
  01/30/2024
  Cash Consideration
  Common
  05/01/2024
  Open Market Purchase
  Open Market Purchaser
  N
  75
  05/01/2024
  Cash Consideration
  Common
  05/01/2024
  Open Market Purchase
  Open Market Purchaser
  N
  100
  05/01/2024
  Cash Consideration
  Common
  07/30/2024
  Open Market Purchase
  Open Market Purchaser
  N
  129
  07/30/2024
  Cash Consideration
  Common
  10/30/2024
  Open Market Purchase
  Open Market Purchaser
  N
  32
  10/30/2024
  Cash Consideration
  Common
  10/30/2024
  Open Market Purchase
  Open Market Purchaser
  N
  102
  10/30/2024
  Cash Consideration
  Y
  12/13/2024
  Carol P. Sanders