{"transactions":[{"id":768262,"issuer":{"id":6834,"kind":"organization","name":"Momentus Inc."},"owners":[{"id":45301,"kind":"person","name":"Ensler Lon","position":1,"cik":"0002018153","reported_name":"Ensler Lon","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Restricted Stock Units","published_at":"2026-05-21T23:24:11.000Z","date":"2026-05-19","kind":"grant","planned":false,"acquired":true,"shares":15107,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unite (RSU) represents a contingent right to receive one share of Momentus Inc. Class A Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Represents a grant of RSUs, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Represents a grant of RSUs, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date."}],"balance_after":23593,"derivative":{"underlying":"Class A Common Stock","underlying_shares":15107},"source":{"system":"sec-edgar","filing":"0002018153-26-000003","document":"primary_doc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2018153/000201815326000003/primary_doc.xml","form_type":"4"}},{"id":768261,"issuer":{"id":6834,"kind":"organization","name":"Momentus Inc."},"owners":[{"id":45301,"kind":"person","name":"Ensler Lon","position":1,"cik":"0002018153","reported_name":"Ensler Lon","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Class A Common Stock","published_at":"2026-05-21T23:24:11.000Z","date":"2026-05-19","kind":"grant","planned":false,"acquired":true,"shares":5405,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":5405,"source":{"system":"sec-edgar","filing":"0002018153-26-000003","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2018153/000201815326000003/primary_doc.xml","form_type":"4"}},{"id":868682,"issuer":{"id":6834,"kind":"organization","name":"Momentus Inc."},"owners":[{"id":45301,"kind":"person","name":"Ensler Lon","position":1,"cik":"0002018153","reported_name":"Ensler Lon","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Restricted Stock Units","published_at":"2026-03-03T23:41:33.000Z","date":"2026-02-27","kind":"grant","planned":false,"acquired":true,"shares":8486,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one share of Momentus Inc. Class A Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Represents a grant of Restricted Stock Units, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Represents a grant of Restricted Stock Units, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date."}],"balance_after":8486,"derivative":{"underlying":"Class A Common Stock","underlying_shares":8486},"source":{"system":"sec-edgar","filing":"0002018153-26-000001","document":"primary_doc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2018153/000201815326000001/primary_doc.xml","form_type":"4"}},{"id":868681,"issuer":{"id":6834,"kind":"organization","name":"Momentus Inc."},"owners":[{"id":45301,"kind":"person","name":"Ensler Lon","position":1,"cik":"0002018153","reported_name":"Ensler Lon","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Restricted Stock Units","published_at":"2026-03-03T23:41:33.000Z","date":"2026-02-27","kind":"grant","planned":false,"acquired":true,"shares":3606,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one share of Momentus Inc. Class A Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Represents a grant of Restricted Stock Units, which vest in four equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Represents a grant of Restricted Stock Units, which vest in four equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date."}],"balance_after":3606,"derivative":{"underlying":"Class A Common Stock","underlying_shares":3606},"source":{"system":"sec-edgar","filing":"0002018153-26-000001","document":"primary_doc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2018153/000201815326000001/primary_doc.xml","form_type":"4"}},{"id":1044168,"issuer":{"id":6834,"kind":"organization","name":"Momentus Inc."},"owners":[{"id":45301,"kind":"person","name":"Ensler Lon","position":1,"cik":"0002018153","reported_name":"Ensler Lon","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Restricted Stock Units","published_at":"2025-09-10T20:08:05.000Z","date":"2025-08-01","kind":"grant","planned":false,"acquired":true,"shares":95000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus, Inc. Class A Common Stock."},{"field":"deemedExecutionDate","element":"deemedExecutionDate","label":"F2","text":"This transaction is being reported late due to an administrative error."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Represents a grant of Restricted Stock Units, which vest in four equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Represents a grant of Restricted Stock Units, which vest in four equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents a grant of Restricted Stock Units, which vest in four equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date."}],"balance_after":95000,"derivative":{"underlying":"Class A Common Stock","underlying_shares":95000},"source":{"system":"sec-edgar","filing":"0002018153-25-000005","document":"wk-form4_1757534881.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2018153/000201815325000005/wk-form4_1757534881.xml","form_type":"4"}}]}