MKS INSTRS INC

Ticker: MKSI CUSIP: 55306N104 Class: EQTY

Aureus Asset Management, LLC's Holding History (CIK: 0001381296)

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

Q4 2021

Shares 1,725 Value ($000) $300 Avg Close $151.09 Range $136.06 - $172.80

Q3 2021

Shares 1,725 Value ($000) $260 Avg Close $148.13 Range $133.76 - $168.78

Q2 2021

Shares 1,725 Value ($000) $307 Avg Close $175.09 Range $158.98 - $192.11

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2021	1,725	$300	$151.09	$136.06 - $172.80
Q3 2021	1,725	$260	$148.13	$133.76 - $168.78
Q2 2021	1,725	$307	$175.09	$158.98 - $192.11