MASIMO CORP

Ticker: MASI CUSIP: 574795100 Class: Common Stock

FRONTIER CAPITAL MANAGEMENT CO LLC's Holding History (CIK: 0000351173)

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

Q3 2019

Shares 4,332 Value ($000) $645 Avg Close $151.90 Range $139.36 - $160.25

Q2 2019

Shares 9,932 Value ($000) $1,478 Avg Close $137.22 Range $118.93 - $148.93

Q1 2019

Shares 40,935 Value ($000) $5,660 Avg Close $125.54 Range $101.87 - $139.48

Q4 2018

Shares 57,376 Value ($000) $6,160 Avg Close $111.51 Range $98.23 - $126.89

Q3 2018

Shares 77,231 Value ($000) $9,618 Avg Close $110.93 Range $96.14 - $124.74

Q2 2018

Shares 138,430 Value ($000) $13,518 Avg Close $95.08 Range $83.16 - $102.32

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2019	4,332	$645	$151.90	$139.36 - $160.25
Q2 2019	9,932	$1,478	$137.22	$118.93 - $148.93
Q1 2019	40,935	$5,660	$125.54	$101.87 - $139.48
Q4 2018	57,376	$6,160	$111.51	$98.23 - $126.89
Q3 2018	77,231	$9,618	$110.93	$96.14 - $124.74
Q2 2018	138,430	$13,518	$95.08	$83.16 - $102.32