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      <liveTestFlag>LIVE</liveTestFlag>


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      <issuerName>Momentus Inc.</issuerName>
      <secFileNumber>001-39128</secFileNumber>
      <issuerAddress>
        <com:street1>1345 ABBOT KINNEY BLVD.</com:street1>
        <com:city>VENICE BEACH</com:city>
        <com:stateOrCountry>CA</com:stateOrCountry>
        <com:zipCode>90291</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>2137936507</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Momentus PML SPV 1 LP</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>10% Stockholder</relationshipToIssuer>
      </relationshipsToIssuer>
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    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Cantor Fitzgerald &amp; Co</name>
        <address>
          <com:street1>110 East 59th Street</com:street1>
          <com:city>New York</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10022</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>6011780</noOfUnitsSold>
      <aggregateMarketValue>1803534.00</aggregateMarketValue>
      <noOfUnitsOutstanding>6011780</noOfUnitsOutstanding>
      <approxSaleDate>06/07/2023</approxSaleDate>
      <securitiesExchangeName>SEC</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>06/21/2019</acquiredDate>
      <natureOfAcquisitionTransaction>Purchase</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Momentus PML SPV 1 LP</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>6011780</amountOfSecuritiesAcquired>
      <paymentDate>06/21/2019</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>06/07/2023</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>06/07/2023</planAdoptionDate>
      </planAdoptionDates>
      <signature>Dakin Sloss</signature>
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144
0001780632
XXXXXXXX
LIVE
0001781162
Momentus Inc.
001-39128
1345 ABBOT KINNEY BLVD.
VENICE BEACH
CA
90291
2137936507
Momentus PML SPV 1 LP
10% Stockholder
Common
Cantor Fitzgerald & Co
110 East 59th Street
New York
NY
10022
6011780
1803534.00
6011780
06/07/2023
SEC
Common
06/21/2019
Purchase
Momentus PML SPV 1 LP
N
6011780
06/21/2019
Cash
Y
06/07/2023
06/07/2023
Dakin Sloss