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The receipt of such shares by the reporting person and Razor's Edge Ventures, LLC constituted a change in form of ownership, which was exempt from reporting pursuant to Rule 16a-13."}],"balance_after":37838,"source":{"system":"sec-edgar","filing":"0001562180-22-005198","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218022005198/primarydocument.xml","form_type":"4"}},{"id":2660167,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":38579,"kind":"person","name":"Spoto Mark","position":1,"cik":"0001836585","reported_name":"Spoto Mark","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Restricted Stock Unit","published_at":"2021-06-21T12:09:45.000Z","date":"2021-06-17","kind":"grant","acquired":true,"shares":1379,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs become fully vested on June 17, 2022 or the 2022 Annual Meeting of the Stockholders of 908 Devices Inc., whichever occurs first, subject to the reporting person's continued service through the applicable vesting date, provided that, if the reporting person terminates their service for any reason, then a prorated number of RSUs will vest. The RSUs have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The RSUs become fully vested on June 17, 2022 or the 2022 Annual Meeting of the Stockholders of 908 Devices Inc., whichever occurs first, subject to the reporting person's continued service through the applicable vesting date, provided that, if the reporting person terminates their service for any reason, then a prorated number of RSUs will vest. The RSUs have no expiration date."}],"balance_after":1379,"derivative":{"underlying":"Common Stock, par value $0.001","underlying_shares":1379},"source":{"system":"sec-edgar","filing":"0001104659-21-083133","document":"tm2120211-7_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000110465921083133/tm2120211-7_4seq1.xml","form_type":"4"}},{"id":2660166,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":38579,"kind":"person","name":"Spoto Mark","position":1,"cik":"0001836585","reported_name":"Spoto Mark","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (option to buy)","published_at":"2021-06-21T12:09:45.000Z","date":"2021-06-17","kind":"grant","acquired":true,"shares":2455,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 12 months following June 17, 2021, subject to the reporting person's continued service through the applicable vesting date."}],"balance_after":2455,"derivative":{"exercise_price":41.7,"expiration_date":"2031-06-17","underlying":"Common Stock, par value $0.001","underlying_shares":2455},"source":{"system":"sec-edgar","filing":"0001104659-21-083133","document":"tm2120211-7_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000110465921083133/tm2120211-7_4seq1.xml","form_type":"4"}},{"id":2934229,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":38579,"kind":"person","name":"Spoto Mark","position":1,"cik":"0001836585","reported_name":"Spoto Mark","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Series E Preferred Stock","published_at":"2020-12-23T01:14:44.000Z","date":"2020-12-22","kind":"exercise","acquired":false,"shares":59602,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These securities are owned directly by Yodabyte Investments, LLC. The reporting person is a managing member of Yodabyte Investments, LLC and may be deemed to be the beneficial owner of the securities held by Yodabyte Investments, LLC. The reporting person disclaims beneficial ownership of the securities held by the Yodabyte Investments, LLC except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock, par value $0.001","underlying_shares":59602},"source":{"system":"sec-edgar","filing":"0001104659-20-138746","document":"tm2039218-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000110465920138746/tm2039218-1_4seq1.xml","form_type":"4"}},{"id":2934228,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":38579,"kind":"person","name":"Spoto Mark","position":1,"cik":"0001836585","reported_name":"Spoto Mark","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Series D Preferred Stock","published_at":"2020-12-23T01:14:44.000Z","date":"2020-12-22","kind":"exercise","acquired":false,"shares":109064,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These securities are owned directly by Yodabyte Investments, LLC. The reporting person is a managing member of Yodabyte Investments, LLC and may be deemed to be the beneficial owner of the securities held by Yodabyte Investments, LLC. The reporting person disclaims beneficial ownership of the securities held by the Yodabyte Investments, LLC except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock, par value $0.001","underlying_shares":109064},"source":{"system":"sec-edgar","filing":"0001104659-20-138746","document":"tm2039218-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000110465920138746/tm2039218-1_4seq1.xml","form_type":"4"}},{"id":2934227,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":38579,"kind":"person","name":"Spoto Mark","position":1,"cik":"0001836585","reported_name":"Spoto Mark","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Series D Preferred Stock","published_at":"2020-12-23T01:14:44.000Z","date":"2020-12-22","kind":"exercise","acquired":false,"shares":92705,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These securities are owned directly by RE Sidecar 4, LLC. The reporting person is a managing member of RE Sidecar 4, LLC and may be deemed to be the beneficial owner of the securities held by RE Sidecar 4, LLC. The reporting person disclaims beneficial ownership of the securities held by the RE Sidecar 4, LLC except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock, par value $0.001","underlying_shares":92705},"source":{"system":"sec-edgar","filing":"0001104659-20-138746","document":"tm2039218-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000110465920138746/tm2039218-1_4seq1.xml","form_type":"4"}},{"id":2934226,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":38579,"kind":"person","name":"Spoto Mark","position":1,"cik":"0001836585","reported_name":"Spoto Mark","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Series C Preferred Stock","published_at":"2020-12-23T01:14:44.000Z","date":"2020-12-22","kind":"exercise","acquired":false,"shares":246151,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These securities are owned directly by RE Sidecar 4, LLC. The reporting person is a managing member of RE Sidecar 4, LLC and may be deemed to be the beneficial owner of the securities held by RE Sidecar 4, LLC. The reporting person disclaims beneficial ownership of the securities held by the RE Sidecar 4, LLC except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock, par value $0.001","underlying_shares":246151},"source":{"system":"sec-edgar","filing":"0001104659-20-138746","document":"tm2039218-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000110465920138746/tm2039218-1_4seq1.xml","form_type":"4"}},{"id":2934225,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":38579,"kind":"person","name":"Spoto Mark","position":1,"cik":"0001836585","reported_name":"Spoto Mark","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Series B Preferred Stock","published_at":"2020-12-23T01:14:44.000Z","date":"2020-12-22","kind":"exercise","acquired":false,"shares":360586,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These securities are owned directly by Razor's Edge Fund LP. The reporting person is a managing member of Razor's Edge Fund LP and may be deemed to be the beneficial owner of the securities held by Razor's Edge Fund LP. The reporting person disclaims beneficial ownership of the securities held by the Razor's Edge Fund LP except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock, par value $0.001","underlying_shares":360586},"source":{"system":"sec-edgar","filing":"0001104659-20-138746","document":"tm2039218-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000110465920138746/tm2039218-1_4seq1.xml","form_type":"4"}},{"id":2934224,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":38579,"kind":"person","name":"Spoto Mark","position":1,"cik":"0001836585","reported_name":"Spoto Mark","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Series A Preferred Stock","published_at":"2020-12-23T01:14:44.000Z","date":"2020-12-22","kind":"exercise","acquired":false,"shares":1075533,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These securities are owned directly by Razor's Edge Fund LP. The reporting person is a managing member of Razor's Edge Fund LP and may be deemed to be the beneficial owner of the securities held by Razor's Edge Fund LP. The reporting person disclaims beneficial ownership of the securities held by the Razor's Edge Fund LP except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock, par value $0.001","underlying_shares":1075533},"source":{"system":"sec-edgar","filing":"0001104659-20-138746","document":"tm2039218-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000110465920138746/tm2039218-1_4seq1.xml","form_type":"4"}},{"id":2934223,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":38579,"kind":"person","name":"Spoto Mark","position":1,"cik":"0001836585","reported_name":"Spoto Mark","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.001","published_at":"2020-12-23T01:14:44.000Z","date":"2020-12-22","kind":"exercise","acquired":true,"shares":168666,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These securities are owned directly by Yodabyte Investments, LLC. The reporting person is a managing member of Yodabyte Investments, LLC and may be deemed to be the beneficial owner of the securities held by Yodabyte Investments, LLC. The reporting person disclaims beneficial ownership of the securities held by the Yodabyte Investments, LLC except to the extent of his pecuniary interest therein."}],"balance_after":168666,"source":{"system":"sec-edgar","filing":"0001104659-20-138746","document":"tm2039218-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000110465920138746/tm2039218-1_4seq1.xml","form_type":"4"}},{"id":2934222,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":38579,"kind":"person","name":"Spoto Mark","position":1,"cik":"0001836585","reported_name":"Spoto Mark","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.001","published_at":"2020-12-23T01:14:44.000Z","date":"2020-12-22","kind":"exercise","acquired":true,"shares":338856,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These securities are owned directly by RE Sidecar 4, LLC. The reporting person is a managing member of RE Sidecar 4, LLC and may be deemed to be the beneficial owner of the securities held by RE Sidecar 4, LLC. The reporting person disclaims beneficial ownership of the securities held by the RE Sidecar 4, LLC except to the extent of his pecuniary interest therein."}],"balance_after":338856,"source":{"system":"sec-edgar","filing":"0001104659-20-138746","document":"tm2039218-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000110465920138746/tm2039218-1_4seq1.xml","form_type":"4"}},{"id":2934221,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":38579,"kind":"person","name":"Spoto Mark","position":1,"cik":"0001836585","reported_name":"Spoto Mark","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.001","published_at":"2020-12-23T01:14:44.000Z","date":"2020-12-22","kind":"exercise","acquired":true,"shares":1436119,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the \"Preferred Shares\") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These securities are owned directly by Razor's Edge Fund LP. The reporting person is a managing member of Razor's Edge Fund LP and may be deemed to be the beneficial owner of the securities held by Razor's Edge Fund LP. The reporting person disclaims beneficial ownership of the securities held by the Razor's Edge Fund LP except to the extent of his pecuniary interest therein."}],"balance_after":1436119,"source":{"system":"sec-edgar","filing":"0001104659-20-138746","document":"tm2039218-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000110465920138746/tm2039218-1_4seq1.xml","form_type":"4"}},{"id":2934220,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":38579,"kind":"person","name":"Spoto Mark","position":1,"cik":"0001836585","reported_name":"Spoto Mark","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.001","published_at":"2020-12-23T01:14:44.000Z","date":"2020-12-22","kind":"purchase","acquired":true,"shares":1000,"price":20,"value":20000.0,"ownership":{"direct":true},"balance_after":1000,"source":{"system":"sec-edgar","filing":"0001104659-20-138746","document":"tm2039218-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000110465920138746/tm2039218-1_4seq1.xml","form_type":"4"}},{"id":2935813,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":38579,"kind":"person","name":"Spoto Mark","position":1,"cik":"0001836585","reported_name":"Spoto Mark","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (option to buy)","published_at":"2020-12-22T00:03:22.000Z","date":"2020-12-17","kind":"grant","acquired":true,"shares":14410,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following December 17, 2020, subject to the reporting person's continued service through the applicable vesting date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following December 17, 2020, subject to the reporting person's continued service through the applicable vesting date."}],"balance_after":14410,"derivative":{"exercise_price":20,"underlying":"Common Stock, par value $0.001","underlying_shares":14410},"source":{"system":"sec-edgar","filing":"0001104659-20-138181","document":"tm2039029-4_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000110465920138181/tm2039029-4_4seq1.xml","form_type":"4"}}]}