MASIMO CORP

Ticker: MASI CUSIP: 574795100 Class: Common Stock

MAINSTAY CAPITAL MANAGEMENT LLC /ADV's Holding History (CIK: 0001127612)

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

Q3 2018

Shares 300 Value ($000) $37 Avg Close $110.93 Range $96.14 - $124.74

Q2 2018

Shares 300 Value ($000) $29 Avg Close $95.08 Range $83.16 - $102.32

Q1 2018

Shares 300 Value ($000) $26 Avg Close $87.17 Range $80.69 - $96.45

Q4 2017

Shares 400 Value ($000) $34 Avg Close $86.74 Range $84.05 - $91.04

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2018	300	$37	$110.93	$96.14 - $124.74
Q2 2018	300	$29	$95.08	$83.16 - $102.32
Q1 2018	300	$26	$87.17	$80.69 - $96.45
Q4 2017	400	$34	$86.74	$84.05 - $91.04