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                    <ns2:ccc>XXXXXXXX</ns2:ccc>
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            </ns2:filer>
            <ns2:liveTestFlag>LIVE</ns2:liveTestFlag>



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            <ns2:secFileNumber>001-41194</ns2:secFileNumber>
            <ns2:issuerAddress>
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                <com:city>Andover</com:city>
                <com:stateOrCountry>MA</com:stateOrCountry>
                <com:zipCode>01810</com:zipCode>
            </ns2:issuerAddress>
            <ns2:issuerContactPhone>1-978-256-1300</ns2:issuerContactPhone>
            <ns2:nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Mark Aslett</ns2:nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <ns2:relationshipsToIssuer>
                <ns2:relationshipToIssuer>Other: Former CEO</ns2:relationshipToIssuer>
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        <ns2:securitiesInformation>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:brokerOrMarketmakerDetails>
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                <ns2:address>
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                    <com:city>New York</com:city>
                    <com:stateOrCountry>NY</com:stateOrCountry>
                    <com:zipCode>10282</com:zipCode>
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            <ns2:noOfUnitsSold>227492</ns2:noOfUnitsSold>
            <ns2:aggregateMarketValue>7698329.28</ns2:aggregateMarketValue>
            <ns2:noOfUnitsOutstanding>58189929</ns2:noOfUnitsOutstanding>
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            <ns2:securitiesExchangeName>NASD</ns2:securitiesExchangeName>
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            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
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            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
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            <ns2:paymentDate>08/16/2013</ns2:paymentDate>
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            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>08/17/2013</ns2:acquiredDate>
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            <ns2:amountOfSecuritiesAcquired>14650</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>08/17/2013</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
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        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>08/15/2019</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Award</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
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            <ns2:amountOfSecuritiesAcquired>21798</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>08/15/2019</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
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        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>08/15/2020</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Award</ns2:natureOfAcquisitionTransaction>
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            <ns2:amountOfSecuritiesAcquired>40854</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>08/15/2020</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
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        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>08/15/2021</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Award</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
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            <ns2:amountOfSecuritiesAcquired>35607</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>08/15/2021</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
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        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>08/15/2021</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Award</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
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            <ns2:amountOfSecuritiesAcquired>4747</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>08/15/2021</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
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        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>08/15/2021</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Award</ns2:natureOfAcquisitionTransaction>
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            <ns2:amountOfSecuritiesAcquired>4276</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>08/15/2021</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
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        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>08/17/2021</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Award</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
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            <ns2:amountOfSecuritiesAcquired>4446</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>08/17/2021</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>08/15/2022</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Award</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>4177</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>08/15/2022</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>08/16/2022</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Award</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>6097</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>08/16/2022</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>08/17/2022</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Award</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>4264</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>08/17/2022</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>08/18/2022</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Award</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>24760</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>08/18/2022</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>02/15/2023</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Award</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>23</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>02/15/2023</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>02/15/2023</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Award</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>4685</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>02/15/2023</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>02/15/2023</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Award</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>153</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>02/15/2023</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>02/16/2023</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Award</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>4612</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>02/16/2023</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>02/16/2023</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Award</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>226</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>02/16/2023</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>02/17/2023</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Award</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>226</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>02/17/2023</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>02/17/2023</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Award</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>4554</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>02/17/2023</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>02/21/2023</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Award</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>4765</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>02/21/2023</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</ns2:nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <ns2:noticeSignature>
            <ns2:noticeDate>08/16/2023</ns2:noticeDate>
            <ns2:planAdoptionDates/>
            <ns2:signature>Goldman Sachs &amp; Co. LLC on behalf of Mark Aslett</ns2:signature>
        </ns2:noticeSignature>
    </ns2:formData>
</ns2:edgarSubmission>
[{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 20810}]
144
0001231657
XXXXXXXX
LIVE
0001049521
Mercury Systems, Inc.
001-41194
50 Minuteman Road
Andover
MA
01810
1-978-256-1300
Mark Aslett
Other: Former CEO
Common
Goldman Sachs & Co. LLC
200 West Street
New York
NY
10282
227492
7698329.28
58189929
08/16/2023
NASD
Common
01/28/2008
Acquired as compensation - Restricted Stock Award
Issuer
N
1500
01/28/2008
Compensation
Common
01/28/2008
Acquired as compensation - Restricted Stock Award
Issuer
N
2000
01/28/2008
Compensation
Common
01/28/2008
Acquired as compensation - Restricted Stock Award
Issuer
N
744
01/28/2008
Compensation
Common
02/15/2013
Acquired as compensation - Restricted Stock Award
Issuer
N
3596
02/15/2013
Compensation
Common
08/15/2013
Acquired as compensation - Restricted Stock Award
Issuer
N
15048
08/15/2013
Compensation
Common
08/15/2013
Acquired as compensation - Restricted Stock Award
Issuer
N
9343
08/15/2013
Compensation
Common
08/16/2013
Acquired as compensation - Restricted Stock Award
Issuer
N
10341
08/16/2013
Compensation
Common
08/17/2013
Acquired as compensation - Restricted Stock Award
Issuer
N
14650
08/17/2013
Compensation
Common
08/15/2019
Acquired as compensation - Restricted Stock Award
Issuer
N
21798
08/15/2019
Compensation
Common
08/15/2020
Acquired as compensation - Restricted Stock Award
Issuer
N
40854
08/15/2020
Compensation
Common
08/15/2021
Acquired as compensation - Restricted Stock Award
Issuer
N
35607
08/15/2021
Compensation
Common
08/15/2021
Acquired as compensation - Restricted Stock Award
Issuer
N
4747
08/15/2021
Compensation
Common
08/15/2021
Acquired as compensation - Restricted Stock Award
Issuer
N
4276
08/15/2021
Compensation
Common
08/17/2021
Acquired as compensation - Restricted Stock Award
Issuer
N
4446
08/17/2021
Compensation
Common
08/15/2022
Acquired as compensation - Restricted Stock Award
Issuer
N
4177
08/15/2022
Compensation
Common
08/16/2022
Acquired as compensation - Restricted Stock Award
Issuer
N
6097
08/16/2022
Compensation
Common
08/17/2022
Acquired as compensation - Restricted Stock Award
Issuer
N
4264
08/17/2022
Compensation
Common
08/18/2022
Acquired as compensation - Restricted Stock Award
Issuer
N
24760
08/18/2022
Compensation
Common
02/15/2023
Acquired as compensation - Restricted Stock Award
Issuer
N
23
02/15/2023
Compensation
Common
02/15/2023
Acquired as compensation - Restricted Stock Award
Issuer
N
4685
02/15/2023
Compensation
Common
02/15/2023
Acquired as compensation - Restricted Stock Award
Issuer
N
153
02/15/2023
Compensation
Common
02/16/2023
Acquired as compensation - Restricted Stock Award
Issuer
N
4612
02/16/2023
Compensation
Common
02/16/2023
Acquired as compensation - Restricted Stock Award
Issuer
N
226
02/16/2023
Compensation
Common
02/17/2023
Acquired as compensation - Restricted Stock Award
Issuer
N
226
02/17/2023
Compensation
Common
02/17/2023
Acquired as compensation - Restricted Stock Award
Issuer
N
4554
02/17/2023
Compensation
Common
02/21/2023
Acquired as compensation - Restricted Stock Award
Issuer
N
4765
02/21/2023
Compensation
Y
08/16/2023
Goldman Sachs & Co. LLC on behalf of Mark Aslett