MASS

SEC source: 0001562180-22-005294 · primarydocument.xml · nonDerivative · entry 1

Griffith Joseph H. IV · CIK 0001431531 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 92,480

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001562180-22-005195 · primarydocument.xml · derivative · entry 4

George Jeffrey P. · CIK 0001796789 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,970

Underlying: Common Stock, par value $0.001 · 7,970 shares

Expires 2032-06-16

F4 · derivative.exercise_date: The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 12 months following June 16, 2022, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-22-005195 · primarydocument.xml · derivative · entry 3

George Jeffrey P. · CIK 0001796789 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,771

Underlying: Common Stock, par value $0.001 · 4,771 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

F3 · derivative.exercise_date: The RSUs become fully vested on June 16, 2023 or the day prior to the 2023 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.

F3 · derivative.expiration_date: The RSUs become fully vested on June 16, 2023 or the day prior to the 2023 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.

SEC source: 0001562180-22-005194 · primarydocument.xml · derivative · entry 4

ELOI FENEL M · CIK 0001237190 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,970

Underlying: Common Stock, par value $0.001 · 7,970 shares

Expires 2032-06-16

F4 · derivative.exercise_date: The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 12 months following June 16, 2022, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-22-005194 · primarydocument.xml · derivative · entry 3

ELOI FENEL M · CIK 0001237190 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,771

Underlying: Common Stock, par value $0.001 · 4,771 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

F3 · derivative.exercise_date: The RSUs become fully vested on June 16, 2023 or the day prior to the 2023 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.

F3 · derivative.expiration_date: The RSUs become fully vested on June 16, 2023 or the day prior to the 2023 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.

SEC source: 0001562180-22-005192 · primarydocument.xml · derivative · entry 5

CRANDELL KEITH · CIK 0001219039 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,970

Underlying: Common Stock, par value $0.001 · 7,970 shares

Expires 2032-06-16

F5 · derivative.exercise_date: The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 12 months following June 16, 2022, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-22-005192 · primarydocument.xml · derivative · entry 4

CRANDELL KEITH · CIK 0001219039 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,771

Underlying: Common Stock, par value $0.001 · 4,771 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

F4 · derivative.exercise_date: The RSUs become fully vested on June 16, 2023 or the day prior to the 2023 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.

F4 · derivative.expiration_date: The RSUs become fully vested on June 16, 2023 or the day prior to the 2023 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.

SEC source: 0001562180-22-005197 · primarydocument.xml · derivative · entry 5

HRUSOVSKY E KEVIN · CIK 0001252546 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,970

Underlying: Common Stock, par value $0.001 · 7,970 shares

Expires 2032-06-16

F5 · derivative.exercise_date: The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 12 months following June 16, 2022, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-22-005197 · primarydocument.xml · derivative · entry 4

HRUSOVSKY E KEVIN · CIK 0001252546 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,771

Underlying: Common Stock, par value $0.001 · 4,771 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

F4 · derivative.exercise_date: The RSUs become fully vested on June 16, 2023 or the day prior to the 2023 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.

F4 · derivative.expiration_date: The RSUs become fully vested on June 16, 2023 or the day prior to the 2023 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.

SEC source: 0001562180-22-005198 · primarydocument.xml · derivative · entry 5

Spoto Mark · CIK 0001836585 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,970

Underlying: Common Stock, par value $0.001 · 7,970 shares

Expires 2032-06-16

F6 · derivative.exercise_date: The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 12 months following June 16, 2022, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-22-005198 · primarydocument.xml · derivative · entry 4

Spoto Mark · CIK 0001836585 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,771

Underlying: Common Stock, par value $0.001 · 4,771 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

F5 · derivative.exercise_date: The RSUs become fully vested on June 16, 2023 or the day prior to the 2023 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.

F5 · derivative.expiration_date: The RSUs become fully vested on June 16, 2023 or the day prior to the 2023 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.

SEC source: 0001562180-22-005193 · primarydocument.xml · derivative · entry 2

Eisenberg Marcia · CIK 0001866723 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,970

Underlying: Common Stock, par value $0.001 · 7,970 shares

Expires 2032-06-16

F3 · derivative.exercise_date: The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 12 months following June 16, 2022, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-22-005193 · primarydocument.xml · derivative · entry 1

Eisenberg Marcia · CIK 0001866723 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,771

Underlying: Common Stock, par value $0.001 · 4,771 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

F2 · derivative.exercise_date: The RSUs become fully vested on June 16, 2023 or the day prior to the 2023 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.

F2 · derivative.expiration_date: The RSUs become fully vested on June 16, 2023 or the day prior to the 2023 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.

SEC source: 0001562180-22-005196 · primarydocument.xml · derivative · entry 2

Hunt Anthony · CIK 0001606030 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,970

Underlying: Common Stock, par value $0.001 · 7,970 shares

Expires 2032-06-16

F3 · derivative.exercise_date: The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 12 months following June 16, 2022, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-22-005196 · primarydocument.xml · derivative · entry 1

Hunt Anthony · CIK 0001606030 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,771

Underlying: Common Stock, par value $0.001 · 4,771 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

F2 · derivative.exercise_date: The RSUs become fully vested on June 16, 2023 or the day prior to the 2023 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.

F2 · derivative.expiration_date: The RSUs become fully vested on June 16, 2023 or the day prior to the 2023 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.

SEC source: 0001562180-22-005195 · primarydocument.xml · derivative · entry 2

George Jeffrey P. · CIK 0001796789 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $0.001 · 1,379 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

F2 · derivative.exercise_date: The RSUs became fully vested on June 15, 2022, the day prior to the 2022 Annual Meeting of the Stockholders of 908 Devices Inc. The RSUs have no expiration date.

F2 · derivative.expiration_date: The RSUs became fully vested on June 15, 2022, the day prior to the 2022 Annual Meeting of the Stockholders of 908 Devices Inc. The RSUs have no expiration date.

SEC source: 0001562180-22-005195 · primarydocument.xml · nonDerivative · entry 1

George Jeffrey P. · CIK 0001796789 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,887

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

SEC source: 0001562180-22-005190 · primarydocument.xml · derivative · entry 3

Griffith Joseph H. IV · CIK 0001431531 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,521

Underlying: Common Stock, par value $0.001 · 41,521 shares

Expires 2026-12-05

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: The shares underlying the option are fully vested and immediately exercisable.

SEC source: 0001562180-22-005190 · primarydocument.xml · nonDerivative · entry 2

Griffith Joseph H. IV · CIK 0001431531 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 91,580

F1 · kind: Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.00 to $15.06, 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.

SEC source: 0001562180-22-005190 · primarydocument.xml · nonDerivative · entry 1

Griffith Joseph H. IV · CIK 0001431531 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 92,580

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001562180-22-005191 · primarydocument.xml · derivative · entry 3

BARTHELEMY NICOLAS · CIK 0001283576 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $0.001 · 1,379 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

F3 · derivative.exercise_date: The RSUs became fully vested on June 15, 2022, the day prior to the 2022 Annual Meeting of the Stockholders of 908 Devices Inc. The RSUs have no expiration date.

F3 · derivative.expiration_date: The RSUs became fully vested on June 15, 2022, the day prior to the 2022 Annual Meeting of the Stockholders of 908 Devices Inc. The RSUs have no expiration date.

SEC source: 0001562180-22-005191 · primarydocument.xml · nonDerivative · entry 1

BARTHELEMY NICOLAS · CIK 0001283576 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,379

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

SEC source: 0001562180-22-005194 · primarydocument.xml · derivative · entry 2

ELOI FENEL M · CIK 0001237190 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $0.001 · 1,379 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

F2 · derivative.exercise_date: The RSUs became fully vested on June 15, 2022, the day prior to the 2022 Annual Meeting of the Stockholders of 908 Devices Inc. The RSUs have no expiration date.

F2 · derivative.expiration_date: The RSUs became fully vested on June 15, 2022, the day prior to the 2022 Annual Meeting of the Stockholders of 908 Devices Inc. The RSUs have no expiration date.

SEC source: 0001562180-22-005194 · primarydocument.xml · nonDerivative · entry 1

ELOI FENEL M · CIK 0001237190 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,887

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

SEC source: 0001562180-22-005192 · primarydocument.xml · derivative · entry 3

CRANDELL KEITH · CIK 0001219039 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $0.001 · 1,379 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

F3 · derivative.exercise_date: The RSUs became fully vested on June 15, 2022, the day prior to the 2022 Annual Meeting of the Stockholders of 908 Devices Inc. The RSUs have no expiration date.

F3 · derivative.expiration_date: The RSUs became fully vested on June 15, 2022, the day prior to the 2022 Annual Meeting of the Stockholders of 908 Devices Inc. The RSUs have no expiration date.

SEC source: 0001562180-22-005192 · primarydocument.xml · nonDerivative · entry 1

CRANDELL KEITH · CIK 0001219039 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,379

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

SEC source: 0001562180-22-005197 · primarydocument.xml · derivative · entry 3

HRUSOVSKY E KEVIN · CIK 0001252546 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $0.001 · 1,379 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

F3 · derivative.exercise_date: The RSUs became fully vested on June 15, 2022, the day prior to the 2022 Annual Meeting of the Stockholders of 908 Devices Inc. The RSUs have no expiration date.

F3 · derivative.expiration_date: The RSUs became fully vested on June 15, 2022, the day prior to the 2022 Annual Meeting of the Stockholders of 908 Devices Inc. The RSUs have no expiration date.

SEC source: 0001562180-22-005197 · primarydocument.xml · nonDerivative · entry 1

HRUSOVSKY E KEVIN · CIK 0001252546 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 244,555

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

SEC source: 0001562180-22-005198 · primarydocument.xml · derivative · entry 3

Spoto Mark · CIK 0001836585 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $0.001 · 1,379 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

F4 · derivative.exercise_date: The RSUs became fully vested on June 15, 2022, the day prior to the 2022 Annual Meeting of the Stockholders of 908 Devices Inc. The RSUs have no expiration date.

F4 · derivative.expiration_date: The RSUs became fully vested on June 15, 2022, the day prior to the 2022 Annual Meeting of the Stockholders of 908 Devices Inc. The RSUs have no expiration date.

SEC source: 0001562180-22-005198 · primarydocument.xml · nonDerivative · entry 1

Spoto Mark · CIK 0001836585 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 37,838

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

F2 · balance_after: The number of shares reported reflect the receipt of shares pursuant to pro rata distributions in kind effected, subsequent to the reporting person's most recent Form 4, by Razor's Edge Fund LP, RE Sidecar 4, LLC and Yodabyte Investments, LLC to their respective partners and members, including the reporting person and Razor's Edge Ventures, LLC, for no additional consideration. 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.

SEC source: 0001562180-22-005189 · primarydocument.xml · nonDerivative · entry 2

Knopp Kevin J. · CIK 0001836523 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 696,038

F1 · kind: Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.98 to $15.06, 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.

SEC source: 0001562180-22-005189 · primarydocument.xml · nonDerivative · entry 1

Knopp Kevin J. · CIK 0001836523 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 698,038

F1 · kind: Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.98 to $14.96, 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.

SEC source: 0001562180-22-005119 · primarydocument.xml · derivative · entry 3

Griffith Joseph H. IV · CIK 0001431531 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 41,521

Underlying: Common Stock, par value $0.001 · 54,855 shares

Expires 2026-12-05

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: The shares underlying the option are fully vested and immediately exercisable.

SEC source: 0001562180-22-005119 · primarydocument.xml · nonDerivative · entry 2

Griffith Joseph H. IV · CIK 0001431531 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 91,580

F1 · kind: Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.38 to $13.82, 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.

SEC source: 0001562180-22-005119 · primarydocument.xml · nonDerivative · entry 1

Griffith Joseph H. IV · CIK 0001431531 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 104,914

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001562180-22-004912 · primarydocument.xml · derivative · entry 2

Eisenberg Marcia · CIK 0001866723 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,363

Underlying: Common Stock · 2,045 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

F2 · derivative.exercise_date: The RSUs become vested in substantially equal annual installments over the 3 years following June 7, 2021, 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.

F2 · derivative.expiration_date: The RSUs become vested in substantially equal annual installments over the 3 years following June 7, 2021, 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.

SEC source: 0001562180-22-004912 · primarydocument.xml · nonDerivative · entry 1

Eisenberg Marcia · CIK 0001866723 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 682

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

SEC source: 0001562180-22-003562 · primarydocument.xml · derivative · entry 2

Basarsky Trent A. · CIK 0001608021 · VP, Corporate Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 65,779

Underlying: Common Stock, par value $0.001 · 5,000 shares

Expires 2027-04-26

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_date: The shares underlying the option are fully vested and immediately exercisable.

SEC source: 0001562180-22-003562 · primarydocument.xml · nonDerivative · entry 1

Basarsky Trent A. · CIK 0001608021 · VP, Corporate Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 80,000

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001562180-22-003384 · primarydocument.xml · derivative · entry 6

Basarsky Trent A. · CIK 0001608021 · VP, Corporate Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 55,779

Underlying: Common Stock, par value $0.001 · 70,779 shares

Expires 2027-04-26

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: The shares underlying the option are fully vested and immediately exercisable.

SEC source: 0001562180-22-003384 · primarydocument.xml · nonDerivative · entry 4

Basarsky Trent A. · CIK 0001608021 · VP, Corporate Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,000

F1 · kind: Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.17 to $20.19, 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.

SEC source: 0001562180-22-003384 · primarydocument.xml · nonDerivative · entry 3

Basarsky Trent A. · CIK 0001608021 · VP, Corporate Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,200

F1 · kind: Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.16 to $20.15, 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.

SEC source: 0001562180-22-003384 · primarydocument.xml · nonDerivative · entry 2

Basarsky Trent A. · CIK 0001608021 · VP, Corporate Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 90,000

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001562180-22-003400 · primarydocument.xml · derivative · entry 3

Kenneweg John · CIK 0001836876 · Vice President, Government

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 53,153

Underlying: Common Stock, par value $0.001 · 63,033 shares

Expires 2023-04-18

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: The shares underlying the option are fully vested and immediately exercisable.

SEC source: 0001562180-22-003400 · primarydocument.xml · nonDerivative · entry 2

Kenneweg John · CIK 0001836876 · Vice President, Government

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · kind: Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.00 to $20.20, 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.

SEC source: 0001562180-22-003400 · primarydocument.xml · nonDerivative · entry 1

Kenneweg John · CIK 0001836876 · Vice President, Government

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,880

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001562180-22-003399 · primarydocument.xml · nonDerivative · entry 1

Brown Christopher D. · CIK 0001836988 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 959,083

F1 · kind: Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.00 to $20.20, 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.

SEC source: 0001562180-22-003384 · primarydocument.xml · derivative · entry 5

Basarsky Trent A. · CIK 0001608021 · VP, Corporate Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,441

Underlying: Common Stock, par value $0.001 · 23,441 shares

Expires 2027-04-26

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: The shares underlying the option are fully vested and immediately exercisable.

SEC source: 0001562180-22-003384 · primarydocument.xml · nonDerivative · entry 1

Basarsky Trent A. · CIK 0001608021 · VP, Corporate Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,000

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001562180-22-002845 · primarydocument.xml · derivative · entry 3

Kenneweg John · CIK 0001836876 · Vice President, Government

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 63,033

Underlying: Common Stock, par value $0.001 · 82,914 shares

Expires 2023-04-18

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: The shares underlying the option are fully vested and immediately exercisable.