MKS INC — Director's Dealing 2018

Feb 16, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2018-02-15

Reporting Person: Quirk Brian Charles (Sr. VP, Global Operations)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-02-15	Common Stock	M	2181.553	—	Acquired	14044.436	Direct
2018-02-15	Common Stock	M	1773.149	—	Acquired	15817.585	Direct
2018-02-15	Common Stock	M	2805	—	Acquired	18622.585	Direct
2018-02-15	Common Stock	M	2157	—	Acquired	20779.585	Direct
2018-02-15	Common Stock	M	1489	—	Acquired	22268.585	Direct
2018-02-15	Common Stock	M	1230	—	Acquired	23498.585	Direct
2018-02-15	Common Stock	F	3858	$111.10	Disposed	19640.585	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2018-02-15	Restricted Stock Unit	$	A	3375.338	Acquired		Common Stock (3375.338)	Direct
2018-02-15	Restricted Stock Unit	$	A	2250.225	Acquired		Common Stock (2250.225)	Direct
2018-02-15	Restricted Stock Unit	$	M	2181.553	Disposed		Common Stock (2181.553)	Direct
2018-02-15	Restricted Stock Unit	$	M	1773.149	Disposed		Common Stock (1773.149)	Direct
2018-02-15	Restricted Stock Unit	$	M	2805	Disposed		Common Stock (2805)	Direct
2018-02-15	Restricted Stock Unit	$	M	2157	Disposed		Common Stock (2157)	Direct
2018-02-15	Restricted Stock Unit	$	M	1489	Disposed		Common Stock (1489)	Direct
2018-02-15	Restricted Stock Unit	$	M	1230	Disposed		Common Stock (1230)	Direct

Footnotes

F1: Each restricted stock unit 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 are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2019, 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 vest in three equal annual installments commencing on February 15, 2019, 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 are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2016, 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 vest in three equal annual installments commencing on February 15, 2016, 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 are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2017, 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 vest in three equal annual installments commencing on February 15, 2017, 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 are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments beginning on February 15, 2018, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

F10: These RSUs vest in three equal annual installments commencing on February 15, 2018, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.