<?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>0001784277</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0000354190</issuerCik>
      <issuerName>Arthur J. Gallagher &amp; Co.</issuerName>
      <secFileNumber>001-09761</secFileNumber>
      <issuerAddress>
        <com:street1>2850 GOLF ROAD</com:street1>
        <com:city>ROLLING MEADOWS</com:city>
        <com:stateOrCountry>IL</com:stateOrCountry>
        <com:zipCode>60008-4050</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>630-773-3800</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Matrix Trust Co</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Trustee for Arthur J Gallagher Rabbi Trust</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Pershing LLC</name>
        <address>
          <com:street1>One Pershing Plaza</com:street1>
          <com:city>Jersey City</com:city>
          <com:stateOrCountry>NJ</com:stateOrCountry>
          <com:zipCode>07399</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>15000</noOfUnitsSold>
      <aggregateMarketValue>3137400.00</aggregateMarketValue>
      <noOfUnitsOutstanding>257100000</noOfUnitsOutstanding>
      <approxSaleDate>03/18/2026</approxSaleDate>
      <securitiesExchangeName>Nasdaq Stock Market</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <acquiredDate>01/01/2012</acquiredDate>
      <natureOfAcquisitionTransaction>Open Market Purchase</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Open Market</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>15000</amountOfSecuritiesAcquired>
      <paymentDate>01/01/2012</paymentDate>
      <natureOfPayment>Cash at time of purchase</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>12/22/2025</saleDate>
      <amountOfSecuritiesSold>456</amountOfSecuritiesSold>
      <grossProceeds>117732.77</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>12/23/2025</saleDate>
      <amountOfSecuritiesSold>44</amountOfSecuritiesSold>
      <grossProceeds>11317.57</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>12/30/2025</saleDate>
      <amountOfSecuritiesSold>206</amountOfSecuritiesSold>
      <grossProceeds>54163.06</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>12/31/2025</saleDate>
      <amountOfSecuritiesSold>238</amountOfSecuritiesSold>
      <grossProceeds>62134.06</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>01/06/2026</saleDate>
      <amountOfSecuritiesSold>5943</amountOfSecuritiesSold>
      <grossProceeds>1562739.19</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>01/09/2026</saleDate>
      <amountOfSecuritiesSold>962</amountOfSecuritiesSold>
      <grossProceeds>254614.56</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>01/13/2026</saleDate>
      <amountOfSecuritiesSold>15</amountOfSecuritiesSold>
      <grossProceeds>3863.51</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>01/20/2026</saleDate>
      <amountOfSecuritiesSold>428</amountOfSecuritiesSold>
      <grossProceeds>109830.75</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>01/21/2026</saleDate>
      <amountOfSecuritiesSold>383</amountOfSecuritiesSold>
      <grossProceeds>95441.99</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>01/22/2026</saleDate>
      <amountOfSecuritiesSold>5926</amountOfSecuritiesSold>
      <grossProceeds>1488275.19</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>01/23/2026</saleDate>
      <amountOfSecuritiesSold>433</amountOfSecuritiesSold>
      <grossProceeds>109654.83</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>01/30/2026</saleDate>
      <amountOfSecuritiesSold>2020</amountOfSecuritiesSold>
      <grossProceeds>508109.39</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>02/02/2026</saleDate>
      <amountOfSecuritiesSold>7</amountOfSecuritiesSold>
      <grossProceeds>1721.81</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>02/09/2026</saleDate>
      <amountOfSecuritiesSold>211</amountOfSecuritiesSold>
      <grossProceeds>47309.89</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>02/10/2026</saleDate>
      <amountOfSecuritiesSold>64</amountOfSecuritiesSold>
      <grossProceeds>13575.52</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>02/13/2026</saleDate>
      <amountOfSecuritiesSold>2557</amountOfSecuritiesSold>
      <grossProceeds>538336.72</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>02/18/2026</saleDate>
      <amountOfSecuritiesSold>318</amountOfSecuritiesSold>
      <grossProceeds>67978.06</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>02/19/2026</saleDate>
      <amountOfSecuritiesSold>245</amountOfSecuritiesSold>
      <grossProceeds>52581.29</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>02/23/2026</saleDate>
      <amountOfSecuritiesSold>224</amountOfSecuritiesSold>
      <grossProceeds>47928.72</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>02/25/2026</saleDate>
      <amountOfSecuritiesSold>42</amountOfSecuritiesSold>
      <grossProceeds>9032.83</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>02/26/2026</saleDate>
      <amountOfSecuritiesSold>123</amountOfSecuritiesSold>
      <grossProceeds>27449.60</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>03/02/2026</saleDate>
      <amountOfSecuritiesSold>97</amountOfSecuritiesSold>
      <grossProceeds>22214.70</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>03/03/2026</saleDate>
      <amountOfSecuritiesSold>1323</amountOfSecuritiesSold>
      <grossProceeds>300104.16</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>03/05/2026</saleDate>
      <amountOfSecuritiesSold>2034</amountOfSecuritiesSold>
      <grossProceeds>462357.28</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Matrix Trust Company</name>
        <address>
          <com:street1>2800 North Central Ave</com:street1>
          <com:street2>Suite 900</com:street2>
          <com:city>Phoenix</com:city>
          <com:stateOrCountry>AZ</com:stateOrCountry>
          <com:zipCode>85004</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>03/12/2026</saleDate>
      <amountOfSecuritiesSold>617</amountOfSecuritiesSold>
      <grossProceeds>127477.88</grossProceeds>
    </securitiesSoldInPast3Months>
    <remarks>It is anticipated that sales covered by this form will be made within the period beginning 3/18/2026 and ending 6/16/2026</remarks>
    <noticeSignature>
      <noticeDate>03/18/2026</noticeDate>
      <signature>Eric Simpson</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
