Turner Michael S.

SEC source: 0001836524-26-000016 · form4-09172026_080950.xml · nonDerivative · entry 2

Turner Michael S. · CIK 0001836524 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 179,521

F3 · kind: Represents shares sold pursuant to a Rule 10b5-1 Plan adopted on May 21, 2026.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.02 to $16.52 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold each separate price within the range set forth in this footnote.

SEC source: 0001836524-26-000016 · form4-09172026_080950.xml · nonDerivative · entry 1

Turner Michael S. · CIK 0001836524 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 197,777

F1 · kind: 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.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.06 to $16.51 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold each separate price within the range set forth in this footnote.

SEC source: 0001562180-25-004948 · primarydocument.xml · nonDerivative · entry 3

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

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

SEC source: 0001562180-25-004948 · primarydocument.xml · nonDerivative · entry 2

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,373

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 $7.50 to $7.54, 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: 0001562180-25-004948 · primarydocument.xml · nonDerivative · entry 1

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,521

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 $7.50 to $7.60, 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: 0001562180-25-002121 · primarydocument.xml · derivative · entry 2

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 125,470

Underlying: Common Stock, par value $0.001 · 125,470 shares

Expires not disclosed

F2 · 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 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. The RSUs have no expiration date.

F3 · derivative.expiration_date: 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. The RSUs have no expiration date.

SEC source: 0001562180-25-002121 · primarydocument.xml · derivative · entry 1

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 57,111

Underlying: Common Stock, par value $0.001 · 57,111 shares

Expires 2034-03-02

F1 · derivative.exercise_date: One-third of the shares underlying the option become vested and exercisable on February 1, 2026, and the remaining two-thirds of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 24 months following February 1, 2026, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-25-000893 · primarydocument.xml · nonDerivative · entry 6

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,603

F2 · kind: 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.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.29 to $2.38, 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: 0001562180-25-000893 · primarydocument.xml · nonDerivative · entry 5

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,765

F2 · kind: 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.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.29 to $2.37, 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.

SEC source: 0001562180-25-000893 · primarydocument.xml · nonDerivative · entry 4

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,572

F2 · kind: 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.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.32 to $2.38, 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: 0001562180-25-000893 · primarydocument.xml · derivative · entry 9

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,500

Underlying: Common Stock · 10,834 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, at settlement, one share of Common Stock. This transaction represents the settlement of RSUs in shares of Common Stock on their scheduled vesting date.

F8 · derivative.exercise_date: These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2024, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

F8 · derivative.expiration_date: These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2024, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

SEC source: 0001562180-25-000893 · primarydocument.xml · derivative · entry 8

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,819

Underlying: Common Stock · 9,909 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, at settlement, one share of Common Stock. This transaction represents the settlement of RSUs in shares of Common Stock on their scheduled vesting date.

F7 · derivative.exercise_date: These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2023, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

F7 · derivative.expiration_date: These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2023, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

SEC source: 0001562180-25-000893 · primarydocument.xml · derivative · entry 7

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,427

Underlying: Common Stock · 4,427 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, at settlement, one share of Common Stock. This transaction represents the settlement of RSUs in shares of Common Stock on their scheduled vesting date.

F6 · derivative.exercise_date: These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2022, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

F6 · derivative.expiration_date: These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2022, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

SEC source: 0001562180-25-000893 · primarydocument.xml · nonDerivative · entry 3

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 34,275

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, at settlement, one share of Common Stock. This transaction represents the settlement of RSUs in shares of Common Stock on their scheduled vesting date.

SEC source: 0001562180-25-000893 · primarydocument.xml · nonDerivative · entry 2

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,441

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, at settlement, one share of Common Stock. This transaction represents the settlement of RSUs in shares of Common Stock on their scheduled vesting date.

SEC source: 0001562180-25-000893 · primarydocument.xml · nonDerivative · entry 1

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,532

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, at settlement, one share of Common Stock. This transaction represents the settlement of RSUs in shares of Common Stock on their scheduled vesting date.

SEC source: 0001562180-24-002326 · primarydocument.xml · derivative · entry 2

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 43,334

Underlying: Common Stock, par value $0.001 · 43,334 shares

Expires not disclosed

F2 · 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 shall vest 25% on February 1, 2025, with the remaining 75% vesting in three substantially equal annual installments at the three anniversary dates following February 1, 2025, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

F3 · derivative.expiration_date: The RSUs shall vest 25% on February 1, 2025, with the remaining 75% vesting in three substantially equal annual installments at the three anniversary dates following February 1, 2025, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

SEC source: 0001562180-24-002326 · primarydocument.xml · derivative · entry 1

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 59,201

Underlying: Common Stock, par value $0.001 · 59,201 shares

Expires 2034-02-28

F1 · derivative.exercise_date: Twenty-five percent of the shares underlying the option become vested and exercisable on February 1, 2025, and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following February 1, 2025, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-24-000998 · primarydocument.xml · derivative · entry 6

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,728

Underlying: Common Stock · 9,910 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, at settlement, one share of Common Stock. This transaction represents the settlement of RSUs in shares of Common Stock on their scheduled vesting date.

F6 · derivative.exercise_date: These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2023, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

F6 · derivative.expiration_date: These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2023, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

SEC source: 0001562180-24-000998 · primarydocument.xml · derivative · entry 5

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,854

Underlying: Common Stock · 4,427 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, at settlement, one share of Common Stock. This transaction represents the settlement of RSUs in shares of Common Stock on their scheduled vesting date.

F5 · derivative.exercise_date: These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2022, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

F5 · derivative.expiration_date: These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2022, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

SEC source: 0001562180-24-000998 · primarydocument.xml · nonDerivative · entry 4

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,105

F2 · kind: 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.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.95 to $7.06, 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: 0001562180-24-000998 · primarydocument.xml · nonDerivative · entry 3

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,721

F2 · kind: 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.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.95 to $7.11, 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: 0001562180-24-000998 · primarydocument.xml · nonDerivative · entry 2

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,337

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, at settlement, one share of Common Stock. This transaction represents the settlement of RSUs in shares of Common Stock on their scheduled vesting date.

SEC source: 0001562180-24-000998 · primarydocument.xml · nonDerivative · entry 1

Turner Michael S. · CIK 0001836524 · Chief Legal & Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,427

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, at settlement, one share of Common Stock. This transaction represents the settlement of RSUs in shares of Common Stock on their scheduled vesting date.

SEC source: 0001562180-23-002859 · primarydocument.xml · derivative · entry 2

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 39,638

Underlying: Common Stock, par value $0.001 · 39,638 shares

Expires not disclosed

F2 · 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 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. The RSUs have no expiration date.

F3 · derivative.expiration_date: 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. The RSUs have no expiration date.

SEC source: 0001562180-23-002859 · primarydocument.xml · derivative · entry 1

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 60,138

Underlying: Common Stock, par value $0.001 · 60,138 shares

Expires 2033-02-28

F1 · derivative.exercise_date: Twenty-five percent of the shares underlying the option become vested and exercisable on February 1, 2024, and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following February 1, 2024, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-23-000969 · primarydocument.xml · nonDerivative · entry 3

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F4 · kind: Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.00 to $10.08, 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: 0001562180-23-000969 · primarydocument.xml · derivative · entry 4

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,281

Underlying: Common Stock · 4,427 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, at settlement, one share of Common Stock. This transaction represents the settlement of RSUs in shares of Common Stock on their scheduled vesting date.

F6 · derivative.exercise_date: The 4,427 RSUs vested on February 1, 2023, with the remaining 13,281 RSUs vesting in three substantially equal annual installments at the three anniversary dates following February 1, 2023, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

F6 · derivative.expiration_date: The 4,427 RSUs vested on February 1, 2023, with the remaining 13,281 RSUs vesting in three substantially equal annual installments at the three anniversary dates following February 1, 2023, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

SEC source: 0001562180-23-000969 · primarydocument.xml · nonDerivative · entry 2

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,848

F2 · kind: 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.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.00 to $9.63, 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: 0001562180-23-000969 · primarydocument.xml · nonDerivative · entry 1

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,427

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, at settlement, one share of Common Stock. This transaction represents the settlement of RSUs in shares of Common Stock on their scheduled vesting date.

SEC source: 0001562180-22-006218 · primarydocument.xml · derivative · entry 3

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 76,069

Underlying: Common Stock, par value $0.001 · 81,069 shares

Expires 2030-11-03

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 become vested and exercisable in substantially equal monthly installments over the 48 months following November 2, 2020, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-22-006218 · primarydocument.xml · nonDerivative · entry 2

Turner Michael S. · CIK 0001836524 · VP, General Counsel

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 $17.90 to $18.79, 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: 0001562180-22-006218 · primarydocument.xml · nonDerivative · entry 1

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,000

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: 0001562180-22-005869 · primarydocument.xml · derivative · entry 3

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 81,069

Underlying: Common Stock, par value $0.001 · 91,069 shares

Expires 2030-11-03

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 become vested and exercisable in substantially equal monthly installments over the 48 months following November 2, 2020, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-22-005869 · primarydocument.xml · nonDerivative · entry 2

Turner Michael S. · CIK 0001836524 · VP, General Counsel

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 $23.90 to $24.02, 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: 0001562180-22-005869 · primarydocument.xml · nonDerivative · entry 1

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,000

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: 0001562180-22-005443 · primarydocument.xml · nonDerivative · entry 1

Turner Michael S. · CIK 0001836524 · VP, General Counsel

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 $20.09, 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: 0001562180-22-005371 · primarydocument.xml · derivative · entry 3

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 91,069

Underlying: Common Stock, par value $0.001 · 101,069 shares

Expires 2030-11-03

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.

F2 · derivative.exercise_date: The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 48 months following November 2, 2020, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-22-005371 · primarydocument.xml · nonDerivative · entry 2

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,000

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

SEC source: 0001562180-22-005371 · primarydocument.xml · nonDerivative · entry 1

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,000

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: 0001562180-22-002270 · primarydocument.xml · derivative · entry 2

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,708

Underlying: Common Stock, par value $0.001 · 17,708 shares

Expires not disclosed

F2 · 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 shall vest 25% on March 1, 2023, with the remaining 75% vesting in three substantially equal annual installments at the three anniversary dates following March 1, 2023, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

F3 · derivative.expiration_date: The RSUs shall vest 25% on March 1, 2023, with the remaining 75% vesting in three substantially equal annual installments at the three anniversary dates following March 1, 2023, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

SEC source: 0001562180-22-002270 · primarydocument.xml · derivative · entry 1

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,412

Underlying: Common Stock, par value $0.001 · 29,412 shares

Expires 2032-03-01

F1 · derivative.exercise_date: Twenty-five percent of the shares underlying the option become vested and exercisable on March 1, 2023, and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following March 1, 2023, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-21-005903 · primarydocument.xml · derivative · entry 4

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 101,070

Underlying: Common Stock, par value $0.001 · 122,918 shares

Expires 2030-11-03

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 become vested and exercisable in substantially equal monthly installments over the 48 months following November 2, 2020, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-21-005903 · primarydocument.xml · nonDerivative · entry 3

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,000

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 $36.78 to $37.59, 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: 0001562180-21-005903 · primarydocument.xml · nonDerivative · entry 2

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,896

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 $35.78 to $36.73, 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: 0001562180-21-005903 · primarydocument.xml · nonDerivative · entry 1

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,848

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: 0001104659-20-138755 · tm2039218d10_4.xml · nonDerivative · entry 1

Turner Michael S. · CIK 0001836524 · VP, General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,000