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These shares were sold in multiple transactions at prices ranging from $4.42 to $4.44, inclusive. The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."}],"balance_after":722733,"source":{"system":"sec-edgar","filing":"0001562180-25-003998","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218025003998/primarydocument.xml","form_type":"4"}},{"id":1148859,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":22795,"kind":"person","name":"Knopp Kevin J.","position":1,"cik":"0001836523","reported_name":"Knopp Kevin J.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2025-05-14T20:28:02.000Z","date":"2025-05-14","kind":"purchase","planned":false,"acquired":true,"shares":15000,"price":4.3192,"value":64788.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The reported purchases are matchable with sales by the reporting person on February 3, 2025 mandated by 908 Devices to cover tax withholding obligations in connection with the vesting and settlement of restricted stock units; however, the reporting person did not realize any profit in connection with such short-swing transactions, and thus no disgorgement is owed to 908 Devices."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $4.25 to $4.40, inclusive. The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."}],"balance_after":707733,"source":{"system":"sec-edgar","filing":"0001562180-25-003819","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218025003819/primarydocument.xml","form_type":"4"}},{"id":1221742,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":22795,"kind":"person","name":"Knopp Kevin J.","position":1,"cik":"0001836523","reported_name":"Knopp Kevin J.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Restricted Stock Units","published_at":"2025-03-05T21:43:30.000Z","date":"2025-03-03","kind":"grant","planned":false,"acquired":true,"shares":198864,"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 shall vest one-third on February 1, 2026, with the remaining two-thirds vesting in two substantially equal annual installments at the two anniversary dates following February 1, 2026, subject to the reporting person's continued service through the applicable vesting date. 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The purchases reported on this Form 4 were at prices that did not increase the short-swing profit, and thus no further disgorgement is owed to 908 Devices."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.89 to $6.70, inclusive. 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The purchases reported on this Form 4 were at prices that did not increase the short-swing profit, and thus no further disgorgement is owed to 908 Devices."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.69 to $5.87, inclusive. 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The purchases reported on this Form 4 were at prices that did not increase the short-swing profit, and thus no further disgorgement is owed to 908 Devices."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.64 to $5.77, inclusive. The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."}],"balance_after":478981,"source":{"system":"sec-edgar","filing":"0001562180-24-003921","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218024003921/primarydocument.xml","form_type":"4"}},{"id":1524402,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":22795,"kind":"person","name":"Knopp Kevin J.","position":1,"cik":"0001836523","reported_name":"Knopp Kevin J.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2024-05-07T22:07:55.000Z","date":"2024-05-07","kind":"purchase","planned":false,"acquired":true,"shares":10000,"price":5.6,"value":56000.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The reporting person's purchase of Common Stock reported herein was matchable under Section 16(b) of the Securities Exchange Act of 1934, to the extent of 9,071 shares, representing (i) the reporting person's sale of 4,099 shares of Common Stock at a price of $6.9716 per share on February 1, 2024, and (ii) the reporting person's sale of 4,972 shares of Common Stock at a price of $7.0161 per share on February 1, 2024. 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The sale is mandated by the Issuer's election to require the satisfaction of tax withholding obligations to be funded by a \"sell to cover\" transaction and does not represent a discretionary transaction by the Reporting Person."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.96 to $7.13, inclusive. The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."}],"balance_after":411981,"source":{"system":"sec-edgar","filing":"0001562180-24-000997","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218024000997/primarydocument.xml","form_type":"4"}},{"id":1660888,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":22795,"kind":"person","name":"Knopp Kevin J.","position":1,"cik":"0001836523","reported_name":"Knopp Kevin J.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2024-02-02T21:39:56.000Z","date":"2024-02-01","kind":"sale","planned":false,"acquired":false,"shares":4099,"price":6.9716,"value":28576.5884,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sale reported on this Form 4 represents shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting and settlement of RSUs. The sale is mandated by the Issuer's election to require the satisfaction of tax withholding obligations to be funded by a \"sell to cover\" transaction and does not represent a discretionary transaction by the Reporting Person."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.93 to $7.06, inclusive. 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These shares were sold in multiple transactions at prices ranging from $10.00 to $10.37, inclusive. The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."}],"balance_after":367848,"source":{"system":"sec-edgar","filing":"0001562180-23-004480","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218023004480/primarydocument.xml","form_type":"4"}},{"id":1949688,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":22795,"kind":"person","name":"Knopp Kevin J.","position":1,"cik":"0001836523","reported_name":"Knopp Kevin J.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Performance-Based Restricted Stock Unit","published_at":"2023-03-16T20:32:38.000Z","date":"2023-03-01","kind":"grant","acquired":true,"shares":53794,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Each Performance-Based RSU represents a contingent right to receive one share of Common Stock, when vested. The actual number of shares of Common Stock earned and acquired upon vesting of the Performance-Based RSUs shall be based upon the achievement of stock price levels pre-established by the Compensation Committee at the grant date, which shall be determined and certified by the Compensation Committee within 30 days of December 31, 2025, with reference to the Company's volume weighted average price of Common Stock on The Nasdaq Global Market during the fourth calendar quarter of fiscal year 2025 (i.e., the period from October 1, 2025 to December 31, 2025), subject to the reporting person's continued service through the vesting date. The number of Performance-Based RSUs reported reflects the maximum number of units the reporting person may earn at the certification date. Any Performance-Based RSUs not earned at the certification date shall be forfeited."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Each Performance-Based RSU represents a contingent right to receive one share of Common Stock, when vested. The actual number of shares of Common Stock earned and acquired upon vesting of the Performance-Based RSUs shall be based upon the achievement of stock price levels pre-established by the Compensation Committee at the grant date, which shall be determined and certified by the Compensation Committee within 30 days of December 31, 2025, with reference to the Company's volume weighted average price of Common Stock on The Nasdaq Global Market during the fourth calendar quarter of fiscal year 2025 (i.e., the period from October 1, 2025 to December 31, 2025), subject to the reporting person's continued service through the vesting date. The number of Performance-Based RSUs reported reflects the maximum number of units the reporting person may earn at the certification date. Any Performance-Based RSUs not earned at the certification date shall be forfeited."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Each Performance-Based RSU represents a contingent right to receive one share of Common Stock, when vested. The actual number of shares of Common Stock earned and acquired upon vesting of the Performance-Based RSUs shall be based upon the achievement of stock price levels pre-established by the Compensation Committee at the grant date, which shall be determined and certified by the Compensation Committee within 30 days of December 31, 2025, with reference to the Company's volume weighted average price of Common Stock on The Nasdaq Global Market during the fourth calendar quarter of fiscal year 2025 (i.e., the period from October 1, 2025 to December 31, 2025), subject to the reporting person's continued service through the vesting date. The number of Performance-Based RSUs reported reflects the maximum number of units the reporting person may earn at the certification date. 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The RSUs have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The RSUs shall vest 25% on February 1, 2024, with the remaining 75% vesting in three substantially equal annual installments at the three anniversary dates following February 1, 2024, subject to the reporting person's continued service through the applicable vesting date. 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These shares were sold in multiple transactions at prices ranging from $10.00 to $10.26, inclusive. The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."}],"balance_after":427848,"source":{"system":"sec-edgar","filing":"0001562180-23-001491","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218023001491/primarydocument.xml","form_type":"4"}},{"id":2006607,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":22795,"kind":"person","name":"Knopp Kevin J.","position":1,"cik":"0001836523","reported_name":"Knopp Kevin J.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock, par value $0.001","published_at":"2023-02-17T21:06:17.000Z","date":"2023-02-15","kind":"sale","acquired":false,"shares":15158,"price":10.29,"value":155975.82,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.20 to $10.42, inclusive. The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."}],"balance_after":432690,"source":{"system":"sec-edgar","filing":"0001562180-23-001491","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218023001491/primarydocument.xml","form_type":"4"}},{"id":2032213,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":22795,"kind":"person","name":"Knopp Kevin J.","position":1,"cik":"0001836523","reported_name":"Knopp Kevin J.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Restricted Stock Unit","published_at":"2023-02-03T22:16:49.000Z","date":"2023-02-01","kind":"exercise","acquired":false,"shares":11255,"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, at settlement, one share of Common Stock. 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These shares were sold in multiple transactions at prices ranging from $10.00 to $10.89, inclusive. The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."}],"balance_after":447848,"source":{"system":"sec-edgar","filing":"0001562180-23-000968","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218023000968/primarydocument.xml","form_type":"4"}},{"id":2032211,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":22795,"kind":"person","name":"Knopp Kevin J.","position":1,"cik":"0001836523","reported_name":"Knopp Kevin J.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2023-02-03T22:16:49.000Z","date":"2023-02-01","kind":"sale","acquired":false,"shares":4049,"price":9.36,"value":37898.64,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sale reported on this Form 4 represents shares sold by the reporting person to cover tax withholding obligations in connection with the vesting and settlement of RSUs. The sale is mandated by the issuer's election to require the satisfaction of tax withholding obligations to be funded by a \"sell to cover\" transaction and does not represent a discretionary transaction by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.98 to $9.63, inclusive. 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These shares were sold in multiple transactions at prices ranging from $12.23 to $12.70, inclusive. 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The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."}],"balance_after":736838,"source":{"system":"sec-edgar","filing":"0001562180-21-006322","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218021006322/primarydocument.xml","form_type":"4"}},{"id":2548030,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":22795,"kind":"person","name":"Knopp Kevin J.","position":1,"cik":"0001836523","reported_name":"Knopp Kevin J.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock, par value $0.001","published_at":"2021-10-05T22:05:24.000Z","date":"2021-10-01","kind":"sale","acquired":false,"shares":4829,"price":33.73,"value":162882.17,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. 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The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."}],"balance_after":742310,"source":{"system":"sec-edgar","filing":"0001562180-21-006322","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218021006322/primarydocument.xml","form_type":"4"}},{"id":2548029,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":22795,"kind":"person","name":"Knopp Kevin J.","position":1,"cik":"0001836523","reported_name":"Knopp Kevin J.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock, par value $0.001","published_at":"2021-10-05T22:05:24.000Z","date":"2021-10-01","kind":"sale","acquired":false,"shares":9699,"price":32.89,"value":319000.11,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. 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These shares were sold in multiple transactions at prices ranging from $36.18 to $36.89, inclusive. The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."}],"balance_after":756838,"source":{"system":"sec-edgar","filing":"0001562180-21-005814","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218021005814/primarydocument.xml","form_type":"4"}},{"id":2578461,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":22795,"kind":"person","name":"Knopp Kevin J.","position":1,"cik":"0001836523","reported_name":"Knopp Kevin J.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock, par value $0.001","published_at":"2021-09-03T20:21:08.000Z","date":"2021-09-01","kind":"sale","acquired":false,"shares":10818,"price":36.02,"value":389664.36,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. 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