Taranto Eric Robert

SEC source: 0001049502-26-000080 · form4.xml · nonDerivative · entry 1

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,596.2394

F1 · price: This transaction was executed in multiple trades at prices ranging from $319.930 to $320.345. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001049502-26-000055 · form4.xml · nonDerivative · entry 1

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,444.7614

F1 · price: This transaction was executed in multiple trades at prices ranging from $220.3701 to $220.780. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001049502-26-000042 · form4.xml · nonDerivative · entry 1

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,012.6404

SEC source: 0001049502-26-000028 · form4.xml · derivative · entry 14

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,028.666

Underlying: Common Stock · 1,303 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 the contingent right to receive one share of common stock of MKS Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F9 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on February 15, 2026, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F9 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on February 15, 2026, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001049502-26-000028 · form4.xml · derivative · entry 13

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,331.666

Underlying: Common Stock · 1,167.36 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 the contingent right to receive one share of common stock of MKS Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F8 · derivative.exercise_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 8, 2026, and thereafter vest in three equal annual installments beginning on February 15, 2026, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F8 · derivative.expiration_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 8, 2026, and thereafter vest in three equal annual installments beginning on February 15, 2026, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001049502-26-000028 · form4.xml · derivative · entry 12

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,499.026

Underlying: Common Stock · 976 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 the contingent right to receive one share of common stock of MKS Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F7 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on February 15, 2025, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F7 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on February 15, 2025, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001049502-26-000028 · form4.xml · derivative · entry 11

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,475.026

Underlying: Common Stock · 348.33 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 the contingent right to receive one share of common stock of MKS Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F6 · derivative.exercise_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 10, 2025, and thereafter vest in three equal annual installments beginning on February 15, 2025, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F6 · derivative.expiration_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 10, 2025, and thereafter vest in three equal annual installments beginning on February 15, 2025, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001049502-26-000028 · form4.xml · derivative · entry 10

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,823.356

Underlying: Common Stock · 914.048 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 the contingent right to receive one share of common stock of MKS Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F5 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on February 15, 2024, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F5 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on February 15, 2024, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001049502-26-000028 · form4.xml · derivative · entry 9

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,737.404

Underlying: Common Stock · 1,764.153 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 the contingent right to receive one share of common stock of MKS Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F4 · derivative.exercise_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 5, 2024, and thereafter vest in three equal annual installments beginning on February 15, 2024, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F4 · derivative.expiration_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 5, 2024, and thereafter vest in three equal annual installments beginning on February 15, 2024, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001049502-26-000028 · form4.xml · derivative · entry 8

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,501.557

Underlying: Common Stock · 1,758.956 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F3 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on February 15, 2027, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F3 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on February 15, 2027, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001049502-26-000028 · form4.xml · nonDerivative · entry 7

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,465.3704

F2 · kind: These shares were withheld by MKS Inc. to satisfy the tax withholding obligations triggered by the vesting of RSUs and do not represent a discretionary trade by the reporting person.

SEC source: 0001049502-26-000028 · form4.xml · nonDerivative · entry 6

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,177.1384

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 the contingent right to receive one share of common stock of MKS Inc.

SEC source: 0001049502-26-000028 · form4.xml · nonDerivative · entry 5

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,874.1384

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 the contingent right to receive one share of common stock of MKS Inc.

SEC source: 0001049502-26-000028 · form4.xml · nonDerivative · entry 4

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,706.7784

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 the contingent right to receive one share of common stock of MKS Inc.

SEC source: 0001049502-26-000028 · form4.xml · nonDerivative · entry 3

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,730.7784

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 the contingent right to receive one share of common stock of MKS Inc.

SEC source: 0001049502-26-000028 · form4.xml · nonDerivative · entry 2

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,382.4484

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 the contingent right to receive one share of common stock of MKS Inc.

SEC source: 0001049502-26-000028 · form4.xml · nonDerivative · entry 1

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,468.4004

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 the contingent right to receive one share of common stock of MKS Inc.

SEC source: 0001049502-26-000014 · form4.xml · derivative · entry 1

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,742.601

Underlying: Common Stock · 3,504.314 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F2 · derivative.exercise_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 8, 2026, and thereafter vest in three equal annual installments beginning on February 15, 2026, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F2 · derivative.expiration_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 8, 2026, and thereafter vest in three equal annual installments beginning on February 15, 2026, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-25-005650 · form4.xml · derivative · entry 14

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,238.287

Underlying: Common Stock · 975 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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F9 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on February 15, 2025, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F9 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on February 15, 2025, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-25-005650 · form4.xml · derivative · entry 13

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,213.287

Underlying: Common Stock · 347.82 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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F8 · derivative.exercise_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 10, 2025, and thereafter vest in three equal annual installments beginning on February 15, 2025, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F8 · derivative.expiration_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 10, 2025, and thereafter vest in three equal annual installments beginning on February 15, 2025, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-25-005650 · form4.xml · derivative · entry 12

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,561.107

Underlying: Common Stock · 914 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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F7 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on February 15, 2024, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F7 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on February 15, 2024, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-25-005650 · form4.xml · derivative · entry 11

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,475.107

Underlying: Common Stock · 1,764 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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F6 · derivative.exercise_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 5, 2024, and thereafter vest in three equal annual installments beginning on February 15, 2024, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F6 · derivative.expiration_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 5, 2024, and thereafter vest in three equal annual installments beginning on February 15, 2024, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-25-005650 · form4.xml · derivative · entry 10

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,239.107

Underlying: Common Stock · 804.704 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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F5 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on February 15, 2023, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F5 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on February 15, 2023, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-25-005650 · form4.xml · derivative · entry 9

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,043.811

Underlying: Common Stock · 1,118.659 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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F4 · derivative.exercise_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 8, 2023, and thereafter vest in three equal annual installments beginning on February 15, 2023, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F4 · derivative.expiration_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 8, 2023, and thereafter vest in three equal annual installments beginning on February 15, 2023, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-25-005650 · form4.xml · derivative · entry 8

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,162.47

Underlying: Common Stock · 3,911.065 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F3 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on February 15, 2026, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F3 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on February 15, 2026, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-25-005650 · form4.xml · nonDerivative · entry 7

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,466.5204

F2 · kind: These shares were withheld by MKS Instruments, Inc. to satisfy the tax withholding obligations triggered by the vesting of RSUs and do not represent a discretionary trade by the reporting person.

SEC source: 0001127602-25-005650 · form4.xml · nonDerivative · entry 6

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,226.5204

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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-25-005650 · form4.xml · nonDerivative · entry 5

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,251.5204

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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-25-005650 · form4.xml · nonDerivative · entry 4

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,903.7004

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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-25-005650 · form4.xml · nonDerivative · entry 3

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,989.7004

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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-25-005650 · form4.xml · nonDerivative · entry 2

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,225.7004

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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-25-005650 · form4.xml · nonDerivative · entry 1

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,420.9964

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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-25-004223 · form4.xml · derivative · entry 1

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,251.405

Underlying: Common Stock · 1,044.913 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F2 · derivative.exercise_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 10, 2025, and thereafter vest in three equal annual installments beginning on February 15, 2025, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F2 · derivative.expiration_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 10, 2025, and thereafter vest in three equal annual installments beginning on February 15, 2025, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-24-005331 · form4.xml · derivative · entry 14

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,206.492

Underlying: Common Stock · 914 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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F9 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on February 15, 2024, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F9 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on February 15, 2024, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-24-005331 · form4.xml · derivative · entry 13

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,120.492

Underlying: Common Stock · 1,764 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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F8 · derivative.exercise_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 5, 2024, and thereafter vest in three equal annual installments beginning on February 15, 2024, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F8 · derivative.expiration_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 5, 2024, and thereafter vest in three equal annual installments beginning on February 15, 2024, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-24-005331 · form4.xml · derivative · entry 12

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,884.492

Underlying: Common Stock · 804 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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F7 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on February 15, 2023, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F7 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on February 15, 2023, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-24-005331 · form4.xml · derivative · entry 11

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,688.492

Underlying: Common Stock · 1,118 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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F6 · derivative.exercise_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 8, 2023, and thereafter vest in three equal annual installments beginning on February 15, 2023, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F6 · derivative.expiration_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 8, 2023, and thereafter vest in three equal annual installments beginning on February 15, 2023, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-24-005331 · form4.xml · derivative · entry 10

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,806.492

Underlying: Common Stock · 387.44 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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F5 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on February 15, 2022, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F5 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on February 15, 2022, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-24-005331 · form4.xml · derivative · entry 9

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,193.932

Underlying: Common Stock · 774.88 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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F4 · derivative.exercise_date: These RSUs were subject to performance criteria, the achievement of which was determined on January 21, 2022, and thereafter vest in three equal annual installments beginning on February 15, 2022, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F4 · derivative.expiration_date: These RSUs were subject to performance criteria, the achievement of which was determined on January 21, 2022, and thereafter vest in three equal annual installments beginning on February 15, 2022, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-24-005331 · form4.xml · derivative · entry 8

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,968.812

Underlying: Common Stock · 2,926.928 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F3 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on February 15, 2025, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F3 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on February 15, 2025, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-24-005331 · form4.xml · nonDerivative · entry 7

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,054.7984

F2 · kind: These shares were withheld by MKS Instruments, Inc. to satisfy the tax withholding obligations triggered by the vesting of RSUs and do not represent a discretionary trade by the reporting person.

SEC source: 0001127602-24-005331 · form4.xml · nonDerivative · entry 6

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,748.7984

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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-24-005331 · form4.xml · nonDerivative · entry 5

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,834.7984

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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-24-005331 · form4.xml · nonDerivative · entry 4

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,070.7984

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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-24-005331 · form4.xml · nonDerivative · entry 3

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,266.7984

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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-24-005331 · form4.xml · nonDerivative · entry 2

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,148.7984

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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-24-005331 · form4.xml · nonDerivative · entry 1

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,761.3584

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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

SEC source: 0001127602-24-003538 · form4.xml · derivative · entry 1

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,041.884

Underlying: Common Stock · 5,292.153 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F2 · derivative.exercise_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 5, 2024, and thereafter vest in three equal annual installments beginning on February 15, 2024, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F2 · derivative.expiration_date: These RSUs were subject to performance criteria, the achievement of which was determined on February 5, 2024, and thereafter vest in three equal annual installments beginning on February 15, 2024, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-23-013194 · form4.xml · derivative · entry 3

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,749.731

Underlying: Common Stock · 934.537 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 the contingent right to receive one share of common stock of MKS Instruments, Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F3 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on April 17, 2021, provided that if, in any vesting year, April 17th is not a business day, such vesting shall occur on the next business day.

F3 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on April 17, 2021, provided that if, in any vesting year, April 17th is not a business day, such vesting shall occur on the next business day.

SEC source: 0001127602-23-013194 · form4.xml · nonDerivative · entry 2

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,710.3104

F2 · kind: These shares were withheld by MKS Instruments, Inc. to satisfy the tax withholding obligations triggered by the vesting of RSUs and do not represent a discretionary trade by the reporting person.