MKS INC — Director's Dealing 2023

Feb 16, 2023

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2023-02-15

Reporting Person: Burke Kathleen Flaherty (EVP, GC & Secretary)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2023-02-15	Common Stock	M	1844.625	—	Acquired	49363.478	Direct
2023-02-15	Common Stock	M	1281.101	—	Acquired	50644.579	Direct
2023-02-15	Common Stock	M	2033	—	Acquired	52677.579	Direct
2023-02-15	Common Stock	M	1016	—	Acquired	53693.579	Direct
2023-02-15	Common Stock	M	2286	—	Acquired	55979.579	Direct
2023-02-15	Common Stock	M	1645	—	Acquired	57624.579	Direct
2023-02-15	Common Stock	F	3474	$100.29	Disposed	54150.579	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2023-02-15	Restricted Stock Unit	$	A	5608.735	Acquired		Common Stock (5608.735)	Direct
2023-02-15	Restricted Stock Unit	$	M	1844.625	Disposed		Common Stock (1844.625)	Direct
2023-02-15	Restricted Stock Unit	$	M	1281.101	Disposed		Common Stock (1281.101)	Direct
2023-02-15	Restricted Stock Unit	$	M	2033	Disposed		Common Stock (2033)	Direct
2023-02-15	Restricted Stock Unit	$	M	1016	Disposed		Common Stock (1016)	Direct
2023-02-15	Restricted Stock Unit	$	M	2286	Disposed		Common Stock (2286)	Direct
2023-02-15	Restricted Stock Unit	$	M	1645	Disposed		Common Stock (1645)	Direct

Footnotes

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

F2: This transaction was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the reporting person.

F3: 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.

F4: These RSUs were subject to performance criteria, the achievement of which was determined on January 25, 2021, and thereafter vest in three equal annual installments beginning on February 15, 2021, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F5: These RSUs vest in three equal annual installments commencing on February 15, 2021, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F6: 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.

F7: 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.

F8: 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.

F9: 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.