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    <ns2:headerData>
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        <ns2:filerInfo>
            <ns2:filer>
                <ns2:filerCredentials>
                    <ns2:cik>0001649552</ns2:cik>
                    <ns2:ccc>XXXXXXXX</ns2:ccc>
                </ns2:filerCredentials>
            </ns2:filer>
            <ns2:liveTestFlag>LIVE</ns2:liveTestFlag>



        </ns2:filerInfo>
    </ns2:headerData>
    <ns2:formData>
        <ns2:issuerInfo>
            <ns2:issuerCik>0001637207</ns2:issuerCik>
            <ns2:issuerName>Planet Fitness, Inc.</ns2:issuerName>
            <ns2:secFileNumber>001-37534</ns2:secFileNumber>
            <ns2:issuerAddress>
                <com:street1>4 Liberty Ln W</com:street1>
                <com:city>Hampton</com:city>
                <com:stateOrCountry>NH</com:stateOrCountry>
                <com:zipCode>03842</com:zipCode>
            </ns2:issuerAddress>
            <ns2:issuerContactPhone>1-603-750-0001</ns2:issuerContactPhone>
            <ns2:nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Christopher J. Rondeau</ns2:nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <ns2:relationshipsToIssuer>
                <ns2:relationshipToIssuer>Director</ns2:relationshipToIssuer>
            </ns2:relationshipsToIssuer>
        </ns2:issuerInfo>
        <ns2:securitiesInformation>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:brokerOrMarketmakerDetails>
                <ns2:name>Goldman Sachs &amp; Co. LLC</ns2:name>
                <ns2:address>
                    <com:street1>200 West Street</com:street1>
                    <com:city>New York</com:city>
                    <com:stateOrCountry>NY</com:stateOrCountry>
                    <com:zipCode>10282</com:zipCode>
                </ns2:address>
            </ns2:brokerOrMarketmakerDetails>
            <ns2:noOfUnitsSold>1000000</ns2:noOfUnitsSold>
            <ns2:aggregateMarketValue>69490000</ns2:aggregateMarketValue>
            <ns2:noOfUnitsOutstanding>85438502</ns2:noOfUnitsOutstanding>
            <ns2:approxSaleDate>12/06/2023</ns2:approxSaleDate>
            <ns2:securitiesExchangeName>NYSE</ns2:securitiesExchangeName>
        </ns2:securitiesInformation>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common Class A</ns2:securitiesClassTitle>
            <ns2:acquiredDate>08/05/2015</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired Class B common shares from Issuer in private transaction; Class B common shares to be converted to Class A common shares in connection with any sales</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>The Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>963695</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>08/05/2015</ns2:paymentDate>
            <ns2:natureOfPayment>None</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common Class A</ns2:securitiesClassTitle>
            <ns2:acquiredDate>06/05/2023</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired from public market</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Public Market</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>10000</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>06/05/2023</ns2:paymentDate>
            <ns2:natureOfPayment>Cash</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common Class A</ns2:securitiesClassTitle>
            <ns2:acquiredDate>04/02/2021</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>The Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>3603</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>04/02/2021</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common Class A</ns2:securitiesClassTitle>
            <ns2:acquiredDate>03/06/2022</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>The Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>3881</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>03/06/2022</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common Class A</ns2:securitiesClassTitle>
            <ns2:acquiredDate>04/09/2022</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>The Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>1375</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>04/09/2022</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common Class A</ns2:securitiesClassTitle>
            <ns2:acquiredDate>03/06/2021</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>The Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>3881</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>03/06/2021</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common Class A</ns2:securitiesClassTitle>
            <ns2:acquiredDate>04/02/2022</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>The Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>3604</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>04/02/2022</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common Class A</ns2:securitiesClassTitle>
            <ns2:acquiredDate>04/09/2021</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>The Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>1376</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>04/09/2021</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common Class A</ns2:securitiesClassTitle>
            <ns2:acquiredDate>03/06/2022</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>The Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>8585</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>03/19/2022</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</ns2:nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <ns2:noticeSignature>
            <ns2:noticeDate>12/06/2023</ns2:noticeDate>
            <ns2:planAdoptionDates/>
            <ns2:signature>Goldman Sachs &amp; Co. LLC on behalf of Christopher J. Rondeau</ns2:signature>
        </ns2:noticeSignature>
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[{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 9262}]
144
0001649552
XXXXXXXX
LIVE
0001637207
Planet Fitness, Inc.
001-37534
4 Liberty Ln W
Hampton
NH
03842
1-603-750-0001
Christopher J. Rondeau
Director
Common
Goldman Sachs & Co. LLC
200 West Street
New York
NY
10282
1000000
69490000
85438502
12/06/2023
NYSE
Common Class A
08/05/2015
Acquired Class B common shares from Issuer in private transaction; Class B common shares to be converted to Class A common shares in connection with any sales
The Issuer
N
963695
08/05/2015
None
Common Class A
06/05/2023
Acquired from public market
Public Market
N
10000
06/05/2023
Cash
Common Class A
04/02/2021
Acquired as compensation -- Restricted Stock Units
The Issuer
N
3603
04/02/2021
Compensation
Common Class A
03/06/2022
Acquired as compensation -- Restricted Stock Units
The Issuer
N
3881
03/06/2022
Compensation
Common Class A
04/09/2022
Acquired as compensation -- Restricted Stock Units
The Issuer
N
1375
04/09/2022
Compensation
Common Class A
03/06/2021
Acquired as compensation -- Restricted Stock Units
The Issuer
N
3881
03/06/2021
Compensation
Common Class A
04/02/2022
Acquired as compensation -- Restricted Stock Units
The Issuer
N
3604
04/02/2022
Compensation
Common Class A
04/09/2021
Acquired as compensation -- Restricted Stock Units
The Issuer
N
1376
04/09/2021
Compensation
Common Class A
03/06/2022
Acquired as compensation -- Restricted Stock Units
The Issuer
N
8585
03/19/2022
Compensation
Y
12/06/2023
Goldman Sachs & Co. LLC on behalf of Christopher J. Rondeau