Knopp Kevin J.

SEC source: 0001836523-26-000013 · form4-08172026_090848.xml · nonDerivative · entry 2

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 555,968

F1 · kind: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025.

F3 · price: The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.08 to $10.45 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 at each separate price within the range set forth in this footnote.

SEC source: 0001836523-26-000013 · form4-08172026_090848.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 575,968

F1 · kind: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025.

F2 · price: The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.05 to $10.12 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 at each separate price within the range set forth in this footnote.

SEC source: 0001836523-26-000011 · form4-08122026_050801.xml · nonDerivative · entry 4

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 583,590

F1 · kind: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025.

F5 · price: The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.05 to $10.25 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 at each separate price within the range set forth in this footnote.

SEC source: 0001836523-26-000011 · form4-08122026_050801.xml · nonDerivative · entry 3

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 586,337

F1 · kind: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025.

F4 · price: The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.08 to $10.34 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 at each separate price within the range set forth in this footnote.

SEC source: 0001836523-26-000011 · form4-08122026_050801.xml · nonDerivative · entry 2

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 616,507

F1 · kind: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025.

F3 · price: The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.08 to $10.0745 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 at each separate price within the range set forth in this footnote.

SEC source: 0001836523-26-000011 · form4-08122026_050801.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 732,255

F1 · kind: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025.

F2 · price: The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.05 to $9.08 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 at each separate price within the range set forth in this footnote.

SEC source: 0001836523-26-000009 · form4-07072026_040703.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 732,603

F1 · kind: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025.

F2 · price: The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.062 to $9.07 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 at each separate price within the range set forth in this footnote.

SEC source: 0001836523-26-000007 · form4-06302026_090609.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 732,825

F1 · kind: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025.

F2 · price: The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.05 to $9.20 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 at each separate price within the ranges set forth in footnotes (2), (3) and (4).

SEC source: 0001836523-26-000005 · form4-06252026_050601.xml · nonDerivative · entry 3

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 735,623

F1 · kind: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025.

F4 · price: The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.05 to $9.19 inclusive.

SEC source: 0001836523-26-000005 · form4-06252026_050601.xml · nonDerivative · entry 2

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 752,011

F1 · kind: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025.

F3 · price: The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.05 to $9.24 inclusive.

SEC source: 0001836523-26-000005 · form4-06252026_050601.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 792,546

F1 · kind: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025.

F2 · price: The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.05 to $9.08 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 at each separate price within the ranges set forth in footnotes (2), (3) and (4).

SEC source: 0001836523-26-000002 · form4-02032026_080205.xml · derivative · entry 12

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 90,043

Underlying: Common Stock · 90,043 shares

Expires 2036-02-01

F10 · derivative.exercise_date: One-third of the shares underlying the option become vested and exercisable on February 1, 2027, 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, 2027, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001836523-26-000002 · form4-02032026_080205.xml · derivative · entry 11

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 205,978

Underlying: Common Stock · 205,978 shares

Expires not disclosed

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.

F9 · derivative.exercise_date: The RSUs shall vest one-third on February 1, 2027, with the remaining two-thirds vesting in two substantially equal annual installments at the two anniversary dates following February 1, 2027, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

F9 · derivative.expiration_date: The RSUs shall vest one-third on February 1, 2027, with the remaining two-thirds vesting in two substantially equal annual installments at the two anniversary dates following February 1, 2027, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

SEC source: 0001836523-26-000002 · form4-02032026_080205.xml · nonDerivative · entry 5

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 795,968

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 $6.105 to $6.32, inclusive. The reporting person undertakes to provide to Issuer, any security holder of Issuer, 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: 0001836523-26-000002 · form4-02032026_080205.xml · derivative · entry 10

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 132,576

Underlying: Common Stock · 66,288 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: 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.

F8 · 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: 0001836523-26-000002 · form4-02032026_080205.xml · derivative · entry 9

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 34,014

Underlying: Common Stock · 17,007 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, 2024, 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, 2024, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

SEC source: 0001836523-26-000002 · form4-02032026_080205.xml · derivative · entry 8

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,448

Underlying: Common Stock · 13,449 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: 0001836523-26-000002 · form4-02032026_080205.xml · derivative · entry 7

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 11,255 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: 0001836523-26-000002 · form4-02032026_080205.xml · nonDerivative · entry 4

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 830,732

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: 0001836523-26-000002 · form4-02032026_080205.xml · nonDerivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 764,444

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: 0001836523-26-000002 · form4-02032026_080205.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 747,437

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: 0001836523-26-000002 · form4-02032026_080205.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 733,988

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: 0001562180-25-003998 · primarydocument.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 722,733

F1 · kind: 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.

F2 · price: The price reported in Column 4 is a weighted average price. 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.

SEC source: 0001562180-25-003819 · primarydocument.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 707,733

F1 · kind: 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.

F2 · price: 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.

SEC source: 0001562180-25-002123 · primarydocument.xml · derivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 198,864

Underlying: Common Stock, par value $0.001 · 198,864 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: 0001562180-25-002123 · primarydocument.xml · derivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 90,518

Underlying: Common Stock, par value $0.001 · 90,518 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: 0001562180-25-000892 · primarydocument.xml · nonDerivative · entry 6

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 692,733

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 $2.40, 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.

SEC source: 0001562180-25-000892 · primarydocument.xml · nonDerivative · entry 5

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 699,257

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 $2.29 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: 0001562180-25-000892 · primarydocument.xml · nonDerivative · entry 4

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 704,416

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 $2.29 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: 0001562180-25-000892 · primarydocument.xml · derivative · entry 10

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 51,021

Underlying: Common Stock · 17,007 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: 0001562180-25-000892 · primarydocument.xml · derivative · entry 9

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,897

Underlying: Common Stock · 13,448 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: 0001562180-25-000892 · primarydocument.xml · derivative · entry 8

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,255

Underlying: Common Stock · 11,254 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: 0001562180-25-000892 · primarydocument.xml · nonDerivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 708,734

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: 0001562180-25-000892 · primarydocument.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 691,727

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: 0001562180-25-000892 · primarydocument.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 678,279

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: 0001562180-24-008416 · primarydocument.xml · derivative · entry 5

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 110,626 shares

Expires 2029-01-21

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 are fully vested and immediately exercisable.

SEC source: 0001562180-24-008416 · primarydocument.xml · derivative · entry 4

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 47,418 shares

Expires 2027-01-01

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 are fully vested and immediately exercisable.

SEC source: 0001562180-24-008416 · primarydocument.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 667,025

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: 0001562180-24-008416 · primarydocument.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 556,399

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: 0001562180-24-003971 · primarydocument.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 508,981

F1 · kind: As a result of the reporting person's prior matchable purchases of Common Stock on May 7, 2024 with sales by the reporting person on February 1, 2024, the reporting person paid to 908 Devices Inc. the full amount of the profit realized in connection with such short-swing transactions. 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.

F2 · price: 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. 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: 0001562180-24-003963 · primarydocument.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 498,981

F1 · kind: As a result of the reporting person's prior matchable purchases of Common Stock on May 7, 2024 with sales by the reporting person on February 1, 2024, the reporting person paid to 908 Devices Inc. the full amount of the profit realized in connection with such short-swing transactions. 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.

F2 · price: 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. 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: 0001562180-24-003946 · primarydocument.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 488,981

F1 · kind: As a result of the reporting person's prior matchable purchases of Common Stock on May 7, 2024 with sales by the reporting person on February 1, 2024, the reporting person paid to 908 Devices Inc. the full amount of the profit realized in connection with such short-swing transactions. 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.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.73 to $5.94, 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: 0001562180-24-003921 · primarydocument.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 478,981

F1 · kind: As a result of the reporting person's prior matchable purchases of Common Stock on May 7, 2024 with sales by the reporting person on February 1, 2024, the reporting person paid to 908 Devices Inc. the full amount of the profit realized in connection with such short-swing transactions. 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.

F2 · price: 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.

SEC source: 0001562180-24-003883 · primarydocument.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 468,981

F1 · kind: 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. The reporting person has paid to 908 Devices Inc. an amount equal to $12,698.28, representing the full amount of the profit realized in connection with the short-swing transactions.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $5.57 to $5.70, 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: 0001562180-24-003426 · primarydocument.xml · derivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 47,418

Underlying: Common Stock · 94,418 shares

Expires 2027-01-01

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 are fully vested and immediately exercisable.

SEC source: 0001562180-24-003426 · primarydocument.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 458,981

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: 0001562180-24-002323 · primarydocument.xml · derivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 68,028

Underlying: Common Stock, par value $0.001 · 68,028 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: 0001562180-24-002323 · primarydocument.xml · derivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 92,937

Underlying: Common Stock, par value $0.001 · 92,937 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: 0001562180-24-000997 · primarydocument.xml · derivative · entry 7

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,345

Underlying: Common Stock · 13,449 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: 0001562180-24-000997 · primarydocument.xml · derivative · entry 6

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,509

Underlying: Common Stock · 11,255 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.