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



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            <issuerCik>0001350653</issuerCik>
            <issuerName>ALPHATEC HOLDINGS, INC.</issuerName>
            <secFileNumber>000-52024</secFileNumber>
            <issuerAddress>
                <ns2:street1>1950 Camino Vida Roble</ns2:street1>
                <ns2:city>CARLSBAD</ns2:city>
                <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                <ns2:zipCode>92008</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>760-431-9286</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>TYSON MARSHALL</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>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>50232</noOfUnitsSold>
            <aggregateMarketValue>546519.14</aggregateMarketValue>
            <noOfUnitsOutstanding>139883919</noOfUnitsOutstanding>
            <approxSaleDate>06/12/2024</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
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            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>07/30/2021</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>5894</amountOfSecuritiesAcquired>
            <paymentDate>07/30/2021</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/24/2023</acquiredDate>
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            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>2158</amountOfSecuritiesAcquired>
            <paymentDate>02/24/2023</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/24/2021</acquiredDate>
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            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>4088</amountOfSecuritiesAcquired>
            <paymentDate>02/24/2021</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>03/05/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>5463</amountOfSecuritiesAcquired>
            <paymentDate>03/05/2023</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/22/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>3300</amountOfSecuritiesAcquired>
            <paymentDate>02/22/2024</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/22/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1650</amountOfSecuritiesAcquired>
            <paymentDate>02/22/2024</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/24/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>3750</amountOfSecuritiesAcquired>
            <paymentDate>02/24/2024</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/24/2024</acquiredDate>
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            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>3125</amountOfSecuritiesAcquired>
            <paymentDate>02/24/2024</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/24/2021</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>4906</amountOfSecuritiesAcquired>
            <paymentDate>02/24/2021</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/26/2021</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>2044</amountOfSecuritiesAcquired>
            <paymentDate>02/26/2021</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/22/2021</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>13854</amountOfSecuritiesAcquired>
            <paymentDate>02/22/2021</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>06/12/2024</noticeDate>
            <planAdoptionDates/>
            <signature>/s/ Tyson Eliot Marshall</signature>
        </noticeSignature>
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144
0001666669
XXXXXXXX
LIVE
0001350653
ALPHATEC HOLDINGS, INC.
000-52024
1950 Camino Vida Roble
CARLSBAD
CA
92008
760-431-9286
TYSON MARSHALL
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
50232
546519.14
139883919
06/12/2024
NASDAQ
Common
07/30/2021
Restricted stock vesting under a registered plan
Issuer
N
5894
07/30/2021
Services Rendered
Common
02/24/2023
Restricted stock vesting under a registered plan
Issuer
N
2158
02/24/2023
Services Rendered
Common
02/24/2021
Restricted stock vesting under a registered plan
Issuer
N
4088
02/24/2021
Services Rendered
Common
03/05/2023
Restricted stock vesting under a registered plan
Issuer
N
5463
03/05/2023
Services Rendered
Common
02/22/2024
Restricted stock vesting under a registered plan
Issuer
N
3300
02/22/2024
Services Rendered
Common
02/22/2024
Restricted stock vesting under a registered plan
Issuer
N
1650
02/22/2024
Services Rendered
Common
02/24/2024
Restricted stock vesting under a registered plan
Issuer
N
3750
02/24/2024
Services Rendered
Common
02/24/2024
Restricted stock vesting under a registered plan
Issuer
N
3125
02/24/2024
Services Rendered
Common
02/24/2021
Restricted stock vesting under a registered plan
Issuer
N
4906
02/24/2021
Services Rendered
Common
02/26/2021
Restricted stock vesting under a registered plan
Issuer
N
2044
02/26/2021
Services Rendered
Common
02/22/2021
Restricted stock vesting under a registered plan
Issuer
N
13854
02/22/2021
Services Rendered
Y
06/12/2024
/s/ Tyson Eliot Marshall