Basarsky Trent A.

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: 0001562180-22-003384 · 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: 0001562180-22-002645 · primarydocument.xml · derivative · entry 6

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 34,570

Underlying: Common Stock, par value $0.001 · 36,875 shares

Expires 2030-09-14

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.

F5 · derivative.exercise_date: The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 48 months following September 11, 2020, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-22-002645 · primarydocument.xml · derivative · entry 5

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,441

Underlying: Common Stock, par value $0.001 · 36,136 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: 0001562180-22-002645 · primarydocument.xml · nonDerivative · entry 4

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 60,000

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 $17.93 to $18.67,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: 0001562180-22-002645 · primarydocument.xml · nonDerivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 66,763

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 $16.93 to $17.71,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: 0001562180-22-002645 · primarydocument.xml · nonDerivative · entry 2

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: 0001562180-22-002645 · primarydocument.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 72,695

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: 0001562180-22-002263 · primarydocument.xml · derivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,828

Underlying: Common Stock, par value $0.001 · 17,828 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: 0001562180-22-002263 · primarydocument.xml · derivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,612

Underlying: Common Stock, par value $0.001 · 29,612 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: 0001562180-22-001929 · primarydocument.xml · derivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,136

Underlying: Common Stock, par value $0.001 · 51,136 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: 0001562180-22-001929 · primarydocument.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 60,000

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: 0001562180-22-001509 · primarydocument.xml · derivative · entry 6

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 51,136

Underlying: Common Stock, par value $0.001 · 60,428 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: 0001562180-22-001509 · primarydocument.xml · nonDerivative · entry 4

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,000

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 $15.00 to $15.43, 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: 0001562180-22-001509 · primarydocument.xml · nonDerivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 54,292

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: 0001562180-22-001509 · primarydocument.xml · derivative · entry 5

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 60,428

Underlying: Common Stock, par value $0.001 · 66,136 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: 0001562180-22-001509 · primarydocument.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,000

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 $15.38, 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: 0001562180-22-001509 · primarydocument.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,708

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: 0001562180-22-000476 · primarydocument.xml · derivative · entry 4

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 66,136

Underlying: Common Stock, par value $0.001 · 81,136 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: 0001562180-22-000476 · primarydocument.xml · nonDerivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,000

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 $19.90 to $20.53, 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: 0001562180-22-000476 · primarydocument.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 47,000

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 $18.87 to $19.80, 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: 0001562180-22-000476 · primarydocument.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 60,000

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: 0001562180-21-007601 · primarydocument.xml · derivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,779

Underlying: Common Stock, par value $0.001 · 85,779 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.

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

F2 · balance_after: On September 27, 2021, the reporting person filed a Form 4/A which inadvertently understated the remaining number of options available for exercise under this stock option by 7,275 shares. This Form 4 corrects the error caused by such understatement in Column 9 of Table II by increasing the total amount of derivative securities subject to this stock option by such 7,275 shares.

SEC source: 0001562180-21-007601 · primarydocument.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,000

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: 0001562180-21-006100 · primarydocument.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,000

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 $37.76 to $38.38, 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: 0001562180-21-006100 · primarydocument.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,872

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 $36.59 to $37.56, 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: 0001562180-21-006126 · primarydocument.xml · derivative · entry 4

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 78,504

Underlying: Common Stock · 84,504 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: 0001562180-21-006126 · primarydocument.xml · nonDerivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,000

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 $37.76 to $38.38, 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: 0001562180-21-006126 · primarydocument.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 38,872

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 $36.59 to $37.56, 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: 0001562180-21-006126 · primarydocument.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 41,000

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: 0001562180-21-005631 · primarydocument.xml · derivative · entry 7

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 84,504

Underlying: Common Stock · 84,643 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.

F3 · derivative.exercise_date: Twenty-five percent of the shares underlying the option became vested and exercisable on January 8, 2018 and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following January 8, 2018, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-21-005631 · primarydocument.xml · derivative · entry 6

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 84,643

Underlying: Common Stock · 85,779 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.

F3 · derivative.exercise_date: Twenty-five percent of the shares underlying the option became vested and exercisable on January 8, 2018 and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following January 8, 2018, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-21-005631 · primarydocument.xml · derivative · entry 5

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 85,779

Underlying: Common Stock · 86,507 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.

F3 · derivative.exercise_date: Twenty-five percent of the shares underlying the option became vested and exercisable on January 8, 2018 and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following January 8, 2018, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-21-005631 · primarydocument.xml · nonDerivative · entry 4

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,000

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 $34.90 to $35.18, 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: 0001562180-21-005631 · primarydocument.xml · nonDerivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 37,003

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: 0001562180-21-005631 · primarydocument.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,864

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: 0001562180-21-005631 · primarydocument.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,728

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: 0001562180-21-005566 · primarydocument.xml · derivative · entry 23

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 86,507

Underlying: Common Stock · 87,407 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.

F7 · derivative.exercise_date: Twenty-five percent of the shares underlying the option became vested and exercisable on January 8, 2018 and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following January 8, 2018, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-21-005566 · primarydocument.xml · derivative · entry 22

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 87,407

Underlying: Common Stock · 88,107 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.

F7 · derivative.exercise_date: Twenty-five percent of the shares underlying the option became vested and exercisable on January 8, 2018 and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following January 8, 2018, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-21-005566 · primarydocument.xml · nonDerivative · entry 14

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,000

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

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $34.90 to $35.01, 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: 0001562180-21-005566 · primarydocument.xml · nonDerivative · entry 13

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,600

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: 0001562180-21-005566 · primarydocument.xml · nonDerivative · entry 12

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,700

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: 0001562180-21-005566 · primarydocument.xml · derivative · entry 21

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 88,107

Underlying: Common Stock · 94,368 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.

F7 · derivative.exercise_date: Twenty-five percent of the shares underlying the option became vested and exercisable on January 8, 2018 and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following January 8, 2018, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0001562180-21-005566 · primarydocument.xml · derivative · entry 20

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 94,368

Underlying: Common Stock · 98,185 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.

F7 · derivative.exercise_date: Twenty-five percent of the shares underlying the option became vested and exercisable on January 8, 2018 and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following January 8, 2018, subject to the reporting person's continued service through the applicable vesting date.