MKS INC — Director's Dealing 2018

Feb 13, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2018-02-12

Reporting Person: Lee John Tseng-Chung (Sr. VP & COO)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2018-02-12	Restricted Stock Unit	$	J	2141.802	Disposed		Common Stock (2141.802)	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 reflects the forfeiture of RSUs due to performance criteria.

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, 2018, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.