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                    <ccc>XXXXXXXX</ccc>
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            <liveTestFlag>LIVE</liveTestFlag>



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            <issuerCik>0001066605</issuerCik>
            <issuerName>HEIDRICK &amp; STRUGGLES INTERNATIONAL INC.</issuerName>
            <secFileNumber>000-25837</secFileNumber>
            <issuerAddress>
                <ns2:street1>233 S. WACKER DR. STE 4200</ns2:street1>
                <ns2:city>CHICAGO</ns2:city>
                <ns2:stateOrCountry>IL</ns2:stateOrCountry>
                <ns2:zipCode>60606</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>312 496-1200</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>SARAH K PAYNE</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Former Officer</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>9953</noOfUnitsSold>
            <aggregateMarketValue>400864.04</aggregateMarketValue>
            <noOfUnitsOutstanding>20620786</noOfUnitsOutstanding>
            <approxSaleDate>05/07/2025</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>03/08/2025</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1381</amountOfSecuritiesAcquired>
            <paymentDate>03/08/2025</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>03/09/2025</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>7090</amountOfSecuritiesAcquired>
            <paymentDate>03/09/2025</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>06/22/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1482</amountOfSecuritiesAcquired>
            <paymentDate>06/22/2024</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>SARAH K PAYNE</name>
                <address>
                    <ns2:street1>233 S. WACKER DR. STE 4200</ns2:street1>
                    <ns2:city>CHICAGO</ns2:city>
                    <ns2:stateOrCountry>IL</ns2:stateOrCountry>
                    <ns2:zipCode>60606</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>03/14/2025</saleDate>
            <amountOfSecuritiesSold>6967</amountOfSecuritiesSold>
            <grossProceeds>297497.17</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>SARAH K PAYNE</name>
                <address>
                    <ns2:street1>233 S. WACKER DR. STE 4200</ns2:street1>
                    <ns2:city>CHICAGO</ns2:city>
                    <ns2:stateOrCountry>IL</ns2:stateOrCountry>
                    <ns2:zipCode>60606</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>03/14/2025</saleDate>
            <amountOfSecuritiesSold>2131</amountOfSecuritiesSold>
            <grossProceeds>90995.62</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>SARAH K PAYNE</name>
                <address>
                    <ns2:street1>233 S. WACKER DR. STE 4200</ns2:street1>
                    <ns2:city>CHICAGO</ns2:city>
                    <ns2:stateOrCountry>IL</ns2:stateOrCountry>
                    <ns2:zipCode>60606</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>03/14/2025</saleDate>
            <amountOfSecuritiesSold>2902</amountOfSecuritiesSold>
            <grossProceeds>123918.01</grossProceeds>
        </securitiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>05/07/2025</noticeDate>
            <planAdoptionDates/>
            <signature>/s/ Sarah Payne</signature>
        </noticeSignature>
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144
0001764815
XXXXXXXX
LIVE
0001066605
HEIDRICK & STRUGGLES INTERNATIONAL INC.
000-25837
233 S. WACKER DR. STE 4200
CHICAGO
IL
60606
312 496-1200
SARAH K PAYNE
Former Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
9953
400864.04
20620786
05/07/2025
NASDAQ
Common
03/08/2025
Restricted stock vesting under a registered plan
Issuer
N
1381
03/08/2025
Services Rendered
Common
03/09/2025
Restricted stock vesting under a registered plan
Issuer
N
7090
03/09/2025
Services Rendered
Common
06/22/2024
Restricted stock vesting under a registered plan
Issuer
N
1482
06/22/2024
Services Rendered
N
SARAH K PAYNE
233 S. WACKER DR. STE 4200
CHICAGO
IL
60606
Common
03/14/2025
6967
297497.17
SARAH K PAYNE
233 S. WACKER DR. STE 4200
CHICAGO
IL
60606
Common
03/14/2025
2131
90995.62
SARAH K PAYNE
233 S. WACKER DR. STE 4200
CHICAGO
IL
60606
Common
03/14/2025
2902
123918.01
05/07/2025
/s/ Sarah Payne