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        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001489550</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001633978</issuerCik>
            <issuerName>LUMENTUM HOLDINGS INC.</issuerName>
            <secFileNumber>001-36861</secFileNumber>
            <issuerAddress>
                <ns2:street1>1001 Ridder Park Drive</ns2:street1>
                <ns2:city>San Jose</ns2:city>
                <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                <ns2:zipCode>95131</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>(408) 546-5483</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>WUPEN YUEN</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>4716</noOfUnitsSold>
            <aggregateMarketValue>362518.92</aggregateMarketValue>
            <noOfUnitsOutstanding>69400000</noOfUnitsOutstanding>
            <approxSaleDate>05/15/2025</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>11/15/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Employee Stock Purchase Plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>481</amountOfSecuritiesAcquired>
            <paymentDate>11/15/2023</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>04/09/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>812</amountOfSecuritiesAcquired>
            <paymentDate>04/09/2024</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>08/03/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>735</amountOfSecuritiesAcquired>
            <paymentDate>08/03/2023</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>05/15/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Employee Stock Purchase Plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>290</amountOfSecuritiesAcquired>
            <paymentDate>05/15/2024</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>08/23/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1266</amountOfSecuritiesAcquired>
            <paymentDate>08/23/2023</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/15/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>300</amountOfSecuritiesAcquired>
            <paymentDate>02/15/2024</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>11/15/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>256</amountOfSecuritiesAcquired>
            <paymentDate>11/15/2023</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>07/30/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>576</amountOfSecuritiesAcquired>
            <paymentDate>07/30/2023</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>WUPEN YUEN</name>
                <address>
                    <ns2:street1>1001 Ridder Park Drive</ns2:street1>
                    <ns2:city>San Jose</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>95131</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/14/2025</saleDate>
            <amountOfSecuritiesSold>1604</amountOfSecuritiesSold>
            <grossProceeds>120203.76</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>WUPEN YUEN</name>
                <address>
                    <ns2:street1>1001 Ridder Park Drive</ns2:street1>
                    <ns2:city>San Jose</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>95131</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/14/2025</saleDate>
            <amountOfSecuritiesSold>826</amountOfSecuritiesSold>
            <grossProceeds>61900.44</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>WUPEN YUEN</name>
                <address>
                    <ns2:street1>1001 Ridder Park Drive</ns2:street1>
                    <ns2:city>San Jose</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>95131</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/14/2025</saleDate>
            <amountOfSecuritiesSold>748</amountOfSecuritiesSold>
            <grossProceeds>56055.12</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>WUPEN YUEN</name>
                <address>
                    <ns2:street1>1001 Ridder Park Drive</ns2:street1>
                    <ns2:city>San Jose</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>95131</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/14/2025</saleDate>
            <amountOfSecuritiesSold>806</amountOfSecuritiesSold>
            <grossProceeds>60401.64</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>WUPEN YUEN</name>
                <address>
                    <ns2:street1>1001 Ridder Park Drive</ns2:street1>
                    <ns2:city>San Jose</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>95131</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/14/2025</saleDate>
            <amountOfSecuritiesSold>22</amountOfSecuritiesSold>
            <grossProceeds>1648.68</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>WUPEN YUEN</name>
                <address>
                    <ns2:street1>1001 Ridder Park Drive</ns2:street1>
                    <ns2:city>San Jose</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>95131</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/14/2025</saleDate>
            <amountOfSecuritiesSold>420</amountOfSecuritiesSold>
            <grossProceeds>31474.80</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>WUPEN YUEN</name>
                <address>
                    <ns2:street1>1001 Ridder Park Drive</ns2:street1>
                    <ns2:city>San Jose</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>95131</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/13/2025</saleDate>
            <amountOfSecuritiesSold>4426</amountOfSecuritiesSold>
            <grossProceeds>317786.80</grossProceeds>
        </securitiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>05/15/2025</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>02/11/2025</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Wupen Yuen</signature>
        </noticeSignature>
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144
0001489550
XXXXXXXX
LIVE
0001633978
LUMENTUM HOLDINGS INC.
001-36861
1001 Ridder Park Drive
San Jose
CA
95131
(408) 546-5483
WUPEN YUEN
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
4716
362518.92
69400000
05/15/2025
NASDAQ
Common
11/15/2023
Employee Stock Purchase Plan
ISSUER
N
481
11/15/2023
Cash
Common
04/09/2024
Restricted Stock
ISSUER
N
812
04/09/2024
Not Applicable
Common
08/03/2023
Restricted Stock
ISSUER
N
735
08/03/2023
Not Applicable
Common
05/15/2024
Employee Stock Purchase Plan
ISSUER
N
290
05/15/2024
Cash
Common
08/23/2023
Restricted Stock
ISSUER
N
1266
08/23/2023
Not Applicable
Common
02/15/2024
Restricted Stock
ISSUER
N
300
02/15/2024
Not Applicable
Common
11/15/2023
Restricted Stock
ISSUER
N
256
11/15/2023
Not Applicable
Common
07/30/2023
Restricted Stock
ISSUER
N
576
07/30/2023
Not Applicable
N
WUPEN YUEN
1001 Ridder Park Drive
San Jose
CA
95131
Common
05/14/2025
1604
120203.76
WUPEN YUEN
1001 Ridder Park Drive
San Jose
CA
95131
Common
05/14/2025
826
61900.44
WUPEN YUEN
1001 Ridder Park Drive
San Jose
CA
95131
Common
05/14/2025
748
56055.12
WUPEN YUEN
1001 Ridder Park Drive
San Jose
CA
95131
Common
05/14/2025
806
60401.64
WUPEN YUEN
1001 Ridder Park Drive
San Jose
CA
95131
Common
05/14/2025
22
1648.68
WUPEN YUEN
1001 Ridder Park Drive
San Jose
CA
95131
Common
05/14/2025
420
31474.80
WUPEN YUEN
1001 Ridder Park Drive
San Jose
CA
95131
Common
05/13/2025
4426
317786.80
05/15/2025
02/11/2025
/s/ Wupen Yuen