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



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            <issuerName>COMMVAULT SYSTEMS, INC.</issuerName>
            <secFileNumber>001-33026</secFileNumber>
            <issuerAddress>
                <ns2:street1>1 Commvault Way</ns2:street1>
                <ns2:city>Tinton Falls</ns2:city>
                <ns2:stateOrCountry>NJ</ns2:stateOrCountry>
                <ns2:zipCode>07724</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>(732) 870-4000</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>GARY D MERRILL</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
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        <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>7236</noOfUnitsSold>
            <aggregateMarketValue>1291675.93</aggregateMarketValue>
            <noOfUnitsOutstanding>44125430</noOfUnitsOutstanding>
            <approxSaleDate>05/16/2025</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
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        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>05/15/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Performance Shares</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>3558</amountOfSecuritiesAcquired>
            <paymentDate>05/15/2024</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>05/15/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>2310</amountOfSecuritiesAcquired>
            <paymentDate>05/15/2024</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>05/16/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Performance Shares</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1368</amountOfSecuritiesAcquired>
            <paymentDate>05/16/2024</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>GARY D MERRILL</name>
                <address>
                    <ns2:street1>1 Commvault Way</ns2:street1>
                    <ns2:city>Tinton Falls</ns2:city>
                    <ns2:stateOrCountry>NJ</ns2:stateOrCountry>
                    <ns2:zipCode>07724</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>02/21/2025</saleDate>
            <amountOfSecuritiesSold>589</amountOfSecuritiesSold>
            <grossProceeds>106793.83</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
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                <name>GARY D MERRILL</name>
                <address>
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                    <ns2:city>Tinton Falls</ns2:city>
                    <ns2:stateOrCountry>NJ</ns2:stateOrCountry>
                    <ns2:zipCode>07724</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>02/21/2025</saleDate>
            <amountOfSecuritiesSold>347</amountOfSecuritiesSold>
            <grossProceeds>62915.89</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>GARY D MERRILL</name>
                <address>
                    <ns2:street1>1 Commvault Way</ns2:street1>
                    <ns2:city>Tinton Falls</ns2:city>
                    <ns2:stateOrCountry>NJ</ns2:stateOrCountry>
                    <ns2:zipCode>07724</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>02/21/2025</saleDate>
            <amountOfSecuritiesSold>223</amountOfSecuritiesSold>
            <grossProceeds>40432.98</grossProceeds>
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                    <ns2:stateOrCountry>NJ</ns2:stateOrCountry>
                    <ns2:zipCode>07724</ns2:zipCode>
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            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>02/21/2025</saleDate>
            <amountOfSecuritiesSold>320</amountOfSecuritiesSold>
            <grossProceeds>58020.42</grossProceeds>
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        <securitiesSoldInPast3Months>
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                    <ns2:stateOrCountry>NJ</ns2:stateOrCountry>
                    <ns2:zipCode>07724</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>02/19/2025</saleDate>
            <amountOfSecuritiesSold>2415</amountOfSecuritiesSold>
            <grossProceeds>449296.72</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
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                    <ns2:stateOrCountry>NJ</ns2:stateOrCountry>
                    <ns2:zipCode>07724</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>02/19/2025</saleDate>
            <amountOfSecuritiesSold>128</amountOfSecuritiesSold>
            <grossProceeds>24248.32</grossProceeds>
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        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>GARY D MERRILL</name>
                <address>
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                    <ns2:city>Tinton Falls</ns2:city>
                    <ns2:stateOrCountry>NJ</ns2:stateOrCountry>
                    <ns2:zipCode>07724</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>02/19/2025</saleDate>
            <amountOfSecuritiesSold>219</amountOfSecuritiesSold>
            <grossProceeds>41487.36</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>GARY D MERRILL</name>
                <address>
                    <ns2:street1>1 Commvault Way</ns2:street1>
                    <ns2:city>Tinton Falls</ns2:city>
                    <ns2:stateOrCountry>NJ</ns2:stateOrCountry>
                    <ns2:zipCode>07724</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>02/19/2025</saleDate>
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            <grossProceeds>32204.80</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>GARY D MERRILL</name>
                <address>
                    <ns2:street1>1 Commvault Way</ns2:street1>
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                    <ns2:stateOrCountry>NJ</ns2:stateOrCountry>
                    <ns2:zipCode>07724</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>02/19/2025</saleDate>
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            <grossProceeds>64599.04</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>GARY D MERRILL</name>
                <address>
                    <ns2:street1>1 Commvault Way</ns2:street1>
                    <ns2:city>Tinton Falls</ns2:city>
                    <ns2:stateOrCountry>NJ</ns2:stateOrCountry>
                    <ns2:zipCode>07724</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>02/19/2025</saleDate>
            <amountOfSecuritiesSold>14</amountOfSecuritiesSold>
            <grossProceeds>2651.59</grossProceeds>
        </securitiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>05/16/2025</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>11/20/2024</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Gary D Merrill</signature>
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144
0001560814
XXXXXXXX
LIVE
0001169561
COMMVAULT SYSTEMS, INC.
001-33026
1 Commvault Way
Tinton Falls
NJ
07724
(732) 870-4000
GARY D MERRILL
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
7236
1291675.93
44125430
05/16/2025
NASDAQ
Common
05/15/2024
Performance Shares
ISSUER
N
3558
05/15/2024
Not Applicable
Common
05/15/2024
Restricted Stock
ISSUER
N
2310
05/15/2024
Not Applicable
Common
05/16/2024
Performance Shares
ISSUER
N
1368
05/16/2024
Not Applicable
N
GARY D MERRILL
1 Commvault Way
Tinton Falls
NJ
07724
Common
02/21/2025
589
106793.83
GARY D MERRILL
1 Commvault Way
Tinton Falls
NJ
07724
Common
02/21/2025
347
62915.89
GARY D MERRILL
1 Commvault Way
Tinton Falls
NJ
07724
Common
02/21/2025
223
40432.98
GARY D MERRILL
1 Commvault Way
Tinton Falls
NJ
07724
Common
02/21/2025
320
58020.42
GARY D MERRILL
1 Commvault Way
Tinton Falls
NJ
07724
Common
02/19/2025
2415
449296.72
GARY D MERRILL
1 Commvault Way
Tinton Falls
NJ
07724
Common
02/19/2025
128
24248.32
GARY D MERRILL
1 Commvault Way
Tinton Falls
NJ
07724
Common
02/19/2025
219
41487.36
GARY D MERRILL
1 Commvault Way
Tinton Falls
NJ
07724
Common
02/19/2025
170
32204.80
GARY D MERRILL
1 Commvault Way
Tinton Falls
NJ
07724
Common
02/19/2025
341
64599.04
GARY D MERRILL
1 Commvault Way
Tinton Falls
NJ
07724
Common
02/19/2025
14
2651.59
05/16/2025
11/20/2024
/s/ Gary D Merrill