MKS INSTRS INC

Ticker: MKSI CUSIP: 55306N104 Class: EQTY

CONGRESS ASSET MANAGEMENT CO /MA's Holding History (CIK: 0000897378)

Note: Option positions (PUT/CALL) are excluded.

Q2 2018

Shares 759,300 Value ($000) $72,665 Avg Close $102.60 Range $86.55 - $115.42

Q1 2018

Shares 758,884 Value ($000) $87,765 Avg Close $103.13 Range $88.32 - $120.60

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2018	759,300	$72,665	$102.60	$86.55 - $115.42
Q1 2018	758,884	$87,765	$103.13	$88.32 - $120.60