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        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001734963</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0000846913</issuerCik>
            <issuerName>FUEL TECH, INC.</issuerName>
            <secFileNumber>001-33059</secFileNumber>
            <issuerAddress>
                <ns2:street1>27601 Bella Vista Parkway</ns2:street1>
                <ns2:city>Warrenville,</ns2:city>
                <ns2:stateOrCountry>IL</ns2:stateOrCountry>
                <ns2:zipCode>60555-1617</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>630-845-4500</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>SHARON JONES</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Director</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>8th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>12627</noOfUnitsSold>
            <aggregateMarketValue>21042.90</aggregateMarketValue>
            <noOfUnitsOutstanding>30777433</noOfUnitsOutstanding>
            <approxSaleDate>06/04/2025</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>05/19/2020</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>12627</amountOfSecuritiesAcquired>
            <paymentDate>05/19/2020</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>06/04/2025</noticeDate>
            <planAdoptionDates/>
            <signature>/s/ Sharon LaRae Jones</signature>
        </noticeSignature>
    </formData>
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144
0001734963
XXXXXXXX
LIVE
0000846913
FUEL TECH, INC.
001-33059
27601 Bella Vista Parkway
Warrenville,
IL
60555-1617
630-845-4500
SHARON JONES
Director
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
12627
21042.90
30777433
06/04/2025
NASDAQ
Common
05/19/2020
Restricted Stock
Issuer
N
12627
05/19/2020
Not Applicable
Y
06/04/2025
/s/ Sharon LaRae Jones