MKS INSTRS INC

Ticker: MKSI CUSIP: 55306N104 Class: EQTY

Portolan Capital Management, LLC's Holding History (CIK: 0001350290)

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

Q4 2021

Shares 35,958 Value ($000) $6,263 Avg Close $151.09 Range $136.06 - $172.80

Q3 2021

Shares 18,215 Value ($000) $2,749 Avg Close $148.13 Range $133.76 - $168.78

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2021	35,958	$6,263	$151.09	$136.06 - $172.80
Q3 2021	18,215	$2,749	$148.13	$133.76 - $168.78