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        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
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        <issuerName>Rocket Lab USA, Inc.</issuerName>
        <secFileNumber>001-39560</secFileNumber>
        <issuerAddress>
          <com:street1>3881 MCGOWEN STREET</com:street1>
          <com:city>LONG BEACH</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>90808</com:zipCode>
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        <issuerContactPhone>714-465-5737</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Kampani Arjun</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Officer</relationshipToIssuer>
        </relationshipsToIssuer>
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      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Fidelity Brokerage Services LLC</name>
          <address>
            <com:street1>900 Salem Street</com:street1>
            <com:city>Smithfield</com:city>
            <com:stateOrCountry>RI</com:stateOrCountry>
            <com:zipCode>02917</com:zipCode>
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        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>29026</noOfUnitsSold>
        <aggregateMarketValue>122411.35</aggregateMarketValue>
        <noOfUnitsOutstanding>492779716</noOfUnitsOutstanding>
        <approxSaleDate>05/24/2024</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
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        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>05/22/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>29026</amountOfSecuritiesAcquired>
        <paymentDate>05/22/2024</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
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      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
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          <name>Arjun L. Kampani</name>
          <address>
            <com:street1>3881 McGowen Street</com:street1>
            <com:city>Long Beach</com:city>
            <com:stateOrCountry>CA</com:stateOrCountry>
            <com:zipCode>90808</com:zipCode>
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        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>03/05/2024</saleDate>
        <amountOfSecuritiesSold>31394</amountOfSecuritiesSold>
        <grossProceeds>133515.54</grossProceeds>
      </securitiesSoldInPast3Months>
      <remarks>Sale includes an amount necessary to cover a tax obligation resulting from the settlement of a vested equity award distribution.</remarks>
      <noticeSignature>
        <noticeDate>05/24/2024</noticeDate>
        <signature>/s/ Gerardo Ibarra-Munoz, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Arjun L. Kampani</signature>
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text: 144
  0001671507
  XXXXXXXX
  LIVE
  0001819994
  Rocket Lab USA, Inc.
  001-39560
  3881 MCGOWEN STREET
  LONG BEACH
  CA
  90808
  714-465-5737
  Kampani Arjun
  Officer
  Common
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  29026
  122411.35
  492779716
  05/24/2024
  NASDAQ
  Common
  05/22/2024
  Restricted Stock Vesting
  Issuer
  N
  29026
  05/22/2024
  Compensation
  N
  Arjun L. Kampani
  3881 McGowen Street
  Long Beach
  CA
  90808
  Common
  03/05/2024
  31394
  133515.54
  Sale includes an amount necessary to cover a tax obligation resulting from the settlement of a vested equity award distribution.
  05/24/2024
  /s/ Gerardo Ibarra-Munoz, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Arjun L. Kampani