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    <headerData>
        <submissionType>144</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001289409</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001350653</issuerCik>
            <issuerName>ALPHATEC HOLDINGS, INC.</issuerName>
            <secFileNumber>000-52024</secFileNumber>
            <issuerAddress>
                <ns2:street1>5818 EL CAMINO REAL</ns2:street1>
                <ns2:city>CARLSBAD</ns2:city>
                <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                <ns2:zipCode>92008</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>760-431-9286</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>PATRICK MILES</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
                <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>38th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>179375</noOfUnitsSold>
            <aggregateMarketValue>2272871.00</aggregateMarketValue>
            <noOfUnitsOutstanding>120319230</noOfUnitsOutstanding>
            <approxSaleDate>09/25/2023</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <acquiredDate>06/30/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Performance Shares</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>179375</amountOfSecuritiesAcquired>
            <paymentDate>06/30/2023</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>PATRICK MILES</name>
                <address>
                    <ns2:street1>5818 EL CAMINO REAL</ns2:street1>
                    <ns2:city>CARLSBAD</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>92008</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>09/20/2023</saleDate>
            <amountOfSecuritiesSold>60000</amountOfSecuritiesSold>
            <grossProceeds>800850.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>PATRICK MILES</name>
                <address>
                    <ns2:street1>5818 EL CAMINO REAL</ns2:street1>
                    <ns2:city>CARLSBAD</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>92008</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>09/19/2023</saleDate>
            <amountOfSecuritiesSold>60000</amountOfSecuritiesSold>
            <grossProceeds>804984.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>PATRICK MILES</name>
                <address>
                    <ns2:street1>5818 EL CAMINO REAL</ns2:street1>
                    <ns2:city>CARLSBAD</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>92008</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>09/18/2023</saleDate>
            <amountOfSecuritiesSold>60000</amountOfSecuritiesSold>
            <grossProceeds>808680.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>09/25/2023</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>06/13/2023</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Patrick Miles</signature>
        </noticeSignature>
    </formData>
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144
0001289409
XXXXXXXX
LIVE
0001350653
ALPHATEC HOLDINGS, INC.
000-52024
5818 EL CAMINO REAL
CARLSBAD
CA
92008
760-431-9286
PATRICK MILES
Officer
Director
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
38th Floor
New York
NY
10004
179375
2272871.00
120319230
09/25/2023
NASDAQ
COMMON
06/30/2023
Performance Shares
ISSUER
N
179375
06/30/2023
Not Applicable
N
PATRICK MILES
5818 EL CAMINO REAL
CARLSBAD
CA
92008
Common
09/20/2023
60000
800850.00
PATRICK MILES
5818 EL CAMINO REAL
CARLSBAD
CA
92008
Common
09/19/2023
60000
804984.00
PATRICK MILES
5818 EL CAMINO REAL
CARLSBAD
CA
92008
Common
09/18/2023
60000
808680.00
09/25/2023
06/13/2023
/s/ Patrick Miles