MKS INC — Director's Dealing 2016

Jun 2, 2016

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2016-05-31

Reporting Person: Werth Dennis L (Sr. VP, Business Units)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2016-05-31	Restricted Stock Unit	$	A	6100.536	Acquired		Common Stock (6100.536)	Direct
2016-05-31	Restricted Stock Unit	$	A	9150.805	Acquired		Common Stock (9150.805)	Direct
2016-05-31	Restricted Stock Unit	$	A	3660.322	Acquired		Common Stock (3660.322)	Direct
2016-05-31	Restricted Stock Unit	$	A	13528.55	Acquired		Common Stock (13528.55)	Direct

Footnotes

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

F2: 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.

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, 2017, 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 annual installments as follows: 20% of the RSUs vests on February 15, 2017, 30% of the RSUs vests on February 15, 2018 and the remaining 50% of the RSUs vests 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.