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Mr. Sloss disclaims any beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the \"Exchange Act\"), except to the extent of its pecuniary interest therein."}],"balance_after":6286561,"source":{"system":"sec-edgar","filing":"0001062993-22-004999","document":"form4a.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1875411/000106299322004999/form4a.xml","form_type":"4/A","original_submission_date":"2022-02-16"}},{"id":2386512,"issuer":{"id":6834,"kind":"organization","name":"Momentus Inc."},"owners":[{"id":109449,"kind":"organization","name":"Prime Movers Lab Fund I LP","position":1,"cik":"0001751631","reported_name":"Prime Movers Lab Fund I LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":109452,"kind":"organization","name":"Momentus PML SPV 1 LP","position":2,"cik":"0001780632","reported_name":"Momentus PML SPV 1 LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":109453,"kind":"organization","name":"MOMENTUS PML SPV 2 LP","position":3,"cik":"0001819327","reported_name":"MOMENTUS PML SPV 2 LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":109454,"kind":"organization","name":"Momentus PML SPV 3 LP","position":4,"cik":"0001853076","reported_name":"Momentus PML SPV 3 LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":109451,"kind":"organization","name":"Prime Movers Growth Fund I LP","position":5,"cik":"0001838981","reported_name":"Prime Movers Growth Fund I LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":109450,"kind":"person","name":"Sloss Dakin","position":6,"cik":"0001875411","reported_name":"Sloss Dakin","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2022-02-18T17:32:23.000Z","date":"2022-02-14","kind":"sale","acquired":false,"shares":218575,"price":3.3661,"value":735745.3075,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price of $3.3661 per share represents a weighted average of purchase prices ranging from $3.00 to $3.61 per share. The reporting person undertakes to provide upon request by the Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F10","text":"Amount includes 172,863 shares inadvertently omitted from the prior Form 4 due to a clerical error."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F1","text":"Held by Prime Movers Lab Fund I LP (\"PML\"). Prime Movers Lab GP I LLC (\"PML GP\") is the general partner of PML."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F6","text":"Dakin Sloss is the manager of PML GP, PML GP II and PM Growth GP, and may be deemed to beneficially own the securities held by PML, PML SPV 1, PML SPV 2, PML SPV 3 and PM Growth. Mr. Sloss disclaims any beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the \"Exchange Act\"), except to the extent of its pecuniary interest therein."}],"balance_after":15859885,"source":{"system":"sec-edgar","filing":"0001062993-22-004999","document":"form4a.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1875411/000106299322004999/form4a.xml","form_type":"4/A","original_submission_date":"2022-02-16"}},{"id":2602522,"issuer":{"id":6834,"kind":"organization","name":"Momentus Inc."},"owners":[{"id":109449,"kind":"organization","name":"Prime Movers Lab Fund I LP","position":1,"cik":"0001751631","reported_name":"Prime Movers Lab Fund I LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":109452,"kind":"organization","name":"Momentus PML SPV 1 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Common Stock of the Issuer at a price of $11.50 per share (subject to adjustment as described in the warrant agreement) for each share of Class A Common Stock of the Issuer purchased by the Reporting Person."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"Pursuant to the Subscription Agreement, the Reporting Person received a warrant to purchase one share of Class A Common Stock of the Issuer at a price of $11.50 per share (subject to adjustment as described in the warrant agreement) for each share of Class A Common Stock of the Issuer purchased by the Reporting Person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"Pursuant to the Subscription Agreement, the Reporting Person received a warrant to purchase one share of Class A Common Stock of the Issuer at a price of $11.50 per share (subject to adjustment as described in the warrant agreement) for each share of Class A Common Stock of the Issuer purchased by the Reporting Person."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"Prime Movers Lab GP I LLC is the general partner of each of the Reporting Persons."}],"balance_after":1000000,"derivative":{"exercise_price":11.5,"underlying":"Class A Common Stock","underlying_shares":1000000},"source":{"system":"sec-edgar","filing":"0001209191-21-051731","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1853076/000120919121051731/doc4.xml","form_type":"4"}},{"id":2602521,"issuer":{"id":6834,"kind":"organization","name":"Momentus Inc."},"owners":[{"id":109449,"kind":"organization","name":"Prime Movers Lab Fund I LP","position":1,"cik":"0001751631","reported_name":"Prime Movers Lab Fund I LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":109452,"kind":"organization","name":"Momentus PML SPV 1 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As a result of the Business Combination, the Issuer changed its name to Momentus Inc. In connection with the Business Combination and in accordance with the Merger Agreement, an aggregate of 65,133,131 shares of Class A Common Stock of Legacy Momentus held by the Reporting Person were converted into 14,905,597 shares of Class A Common Stock of the Issuer. The issuance of the shares was approved by the Issuer's board of directors pursuant to Rule 16b-3 under the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Prime Movers Lab GP I LLC is the general partner of each of the Reporting Persons."}],"balance_after":2526394,"source":{"system":"sec-edgar","filing":"0001209191-21-051731","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1853076/000120919121051731/doc4.xml","form_type":"4"}},{"id":2602520,"issuer":{"id":6834,"kind":"organization","name":"Momentus Inc."},"owners":[{"id":109449,"kind":"organization","name":"Prime Movers Lab Fund I LP","position":1,"cik":"0001751631","reported_name":"Prime Movers Lab Fund I LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":109452,"kind":"organization","name":"Momentus PML SPV 1 LP","position":2,"cik":"0001780632","reported_name":"Momentus PML SPV 1 LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":109453,"kind":"organization","name":"MOMENTUS PML SPV 2 LP","position":3,"cik":"0001819327","reported_name":"MOMENTUS PML SPV 2 LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":109454,"kind":"organization","name":"Momentus PML SPV 3 LP","position":4,"cik":"0001853076","reported_name":"Momentus PML SPV 3 LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2021-08-16T21:08:08.000Z","date":"2021-08-12","kind":"grant","acquired":true,"shares":1018594,"ownership":{"direct":false,"nature":"By Momentus PML SPV 2 LP"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On August 12, 2021, pursuant to that certain Agreement and Plan of Merger, dated as of October 7, 2020 (as amended, supplemented or modified from time to time, the \"Merger Agreement\"), by and among Stable Road Acquisition Corp., a Delaware corporation (the \"Issuer\"), Momentus Inc., a Delaware corporation (\"Legacy Momentus\"), and the other parties thereto, the Issuer completed its initial business combination (the \"Business Combination\"). As a result of the Business Combination, the Issuer changed its name to Momentus Inc. In connection with the Business Combination and in accordance with the Merger Agreement, an aggregate of 65,133,131 shares of Class A Common Stock of Legacy Momentus held by the Reporting Person were converted into 14,905,597 shares of Class A Common Stock of the Issuer. The issuance of the shares was approved by the Issuer's board of directors pursuant to Rule 16b-3 under the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Prime Movers Lab GP I LLC is the general partner of each of the Reporting Persons."}],"balance_after":1018594,"source":{"system":"sec-edgar","filing":"0001209191-21-051731","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1853076/000120919121051731/doc4.xml","form_type":"4"}},{"id":2602519,"issuer":{"id":6834,"kind":"organization","name":"Momentus Inc."},"owners":[{"id":109449,"kind":"organization","name":"Prime Movers Lab Fund I LP","position":1,"cik":"0001751631","reported_name":"Prime Movers Lab Fund I LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":109452,"kind":"organization","name":"Momentus PML SPV 1 LP","position":2,"cik":"0001780632","reported_name":"Momentus PML SPV 1 LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":109453,"kind":"organization","name":"MOMENTUS PML SPV 2 LP","position":3,"cik":"0001819327","reported_name":"MOMENTUS PML SPV 2 LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":109454,"kind":"organization","name":"Momentus PML SPV 3 LP","position":4,"cik":"0001853076","reported_name":"Momentus PML SPV 3 LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2021-08-16T21:08:08.000Z","date":"2021-08-12","kind":"grant","acquired":true,"shares":6373200,"ownership":{"direct":false,"nature":"By Momentus PML SPV 1 LP"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On August 12, 2021, pursuant to that certain Agreement and Plan of Merger, dated as of October 7, 2020 (as amended, supplemented or modified from time to time, the \"Merger Agreement\"), by and among Stable Road Acquisition Corp., a Delaware corporation (the \"Issuer\"), Momentus Inc., a Delaware corporation (\"Legacy Momentus\"), and the other parties thereto, the Issuer completed its initial business combination (the \"Business Combination\"). As a result of the Business Combination, the Issuer changed its name to Momentus Inc. In connection with the Business Combination and in accordance with the Merger Agreement, an aggregate of 65,133,131 shares of Class A Common Stock of Legacy Momentus held by the Reporting Person were converted into 14,905,597 shares of Class A Common Stock of the Issuer. The issuance of the shares was approved by the Issuer's board of directors pursuant to Rule 16b-3 under the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Prime Movers Lab GP I LLC is the general partner of each of the Reporting Persons."}],"balance_after":6373200,"source":{"system":"sec-edgar","filing":"0001209191-21-051731","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1853076/000120919121051731/doc4.xml","form_type":"4"}},{"id":2602518,"issuer":{"id":6834,"kind":"organization","name":"Momentus Inc."},"owners":[{"id":109449,"kind":"organization","name":"Prime Movers Lab Fund I LP","position":1,"cik":"0001751631","reported_name":"Prime Movers Lab Fund I LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":109452,"kind":"organization","name":"Momentus PML SPV 1 LP","position":2,"cik":"0001780632","reported_name":"Momentus PML SPV 1 LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":109453,"kind":"organization","name":"MOMENTUS PML SPV 2 LP","position":3,"cik":"0001819327","reported_name":"MOMENTUS PML SPV 2 LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":109454,"kind":"organization","name":"Momentus PML SPV 3 LP","position":4,"cik":"0001853076","reported_name":"Momentus PML SPV 3 LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2021-08-16T21:08:08.000Z","date":"2021-08-12","kind":"grant","acquired":true,"shares":1000000,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Pursuant to a Subscription Agreement dated as of July 16, 2021 (as amended from time to time, the \"Subscription Agreement\") entered into in connection with the Business Combination Agreement, the Reporting Person agreed to subscribe for and purchase, in a private placement immediately prior to the closing of the Business Combination, an aggregate of 1,000,000 shares of Class A Common Stock of the Issuer for a purchase price of $10.00 per share."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"Prime Movers Lab GP I LLC is the general partner of each of the Reporting Persons."}],"balance_after":15905597,"source":{"system":"sec-edgar","filing":"0001209191-21-051731","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1853076/000120919121051731/doc4.xml","form_type":"4"}},{"id":2602517,"issuer":{"id":6834,"kind":"organization","name":"Momentus Inc."},"owners":[{"id":109449,"kind":"organization","name":"Prime Movers Lab Fund I LP","position":1,"cik":"0001751631","reported_name":"Prime Movers Lab Fund I LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":109452,"kind":"organization","name":"Momentus PML SPV 1 LP","position":2,"cik":"0001780632","reported_name":"Momentus PML SPV 1 LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":109453,"kind":"organization","name":"MOMENTUS PML SPV 2 LP","position":3,"cik":"0001819327","reported_name":"MOMENTUS PML SPV 2 LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":109454,"kind":"organization","name":"Momentus PML SPV 3 LP","position":4,"cik":"0001853076","reported_name":"Momentus PML SPV 3 LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2021-08-16T21:08:08.000Z","date":"2021-08-12","kind":"grant","acquired":true,"shares":14905597,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On August 12, 2021, pursuant to that certain Agreement and Plan of Merger, dated as of October 7, 2020 (as amended, supplemented or modified from time to time, the \"Merger Agreement\"), by and among Stable Road Acquisition Corp., a Delaware corporation (the \"Issuer\"), Momentus Inc., a Delaware corporation (\"Legacy Momentus\"), and the other parties thereto, the Issuer completed its initial business combination (the \"Business Combination\"). As a result of the Business Combination, the Issuer changed its name to Momentus Inc. In connection with the Business Combination and in accordance with the Merger Agreement, an aggregate of 65,133,131 shares of Class A Common Stock of Legacy Momentus held by the Reporting Person were converted into 14,905,597 shares of Class A Common Stock of the Issuer. The issuance of the shares was approved by the Issuer's board of directors pursuant to Rule 16b-3 under the Securities Exchange Act of 1934, as amended."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"Prime Movers Lab GP I LLC is the general partner of each of the Reporting Persons."}],"balance_after":14905597,"source":{"system":"sec-edgar","filing":"0001209191-21-051731","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1853076/000120919121051731/doc4.xml","form_type":"4"}}]}