MKS INC — Director's Dealing 2017

Feb 14, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2017-02-10

Reporting Person: Abrams John R (Sr. VP, Global Sales & Service)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-02-10	Common Stock	M	1722.289	—	Acquired	6665.076	Direct
2017-02-10	Common Stock	M	1148.526	—	Acquired	7813.602	Direct
2017-02-10	Common Stock	F	999	$66.95	Disposed	6814.602	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-02-10	Restricted Stock Unit	$	M	1722.289	Disposed		Common Stock (1722.289)	Direct
2017-02-10	Restricted Stock Unit	$	M	1148.526	Disposed		Common Stock (1148.526)	Direct
2017-02-13	Restricted Stock Unit	$	J	1204.095	Disposed		Common Stock (1204.095)	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 the grant and thereafter vest in equal annual installments over three years.

F4: The RSUs vest in equal annual installments over three years from the respective original grant date.

F5: This transaction reflects the forfeiture of RSUs due to performance criteria.

F6: 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.