MASIMO CORP

Ticker: MASI CUSIP: 574795100 Class: Common Stock

THOMPSON SIEGEL & WALMSLEY LLC's Holding History (CIK: 0001008322)

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

Q1 2019

Shares 1,500 Value ($000) $207 Avg Close $125.54 Range $101.87 - $139.48

Q3 2017

Shares 450 Value ($000) $39 Avg Close $88.42 Range $81.01 - $100.00

Q2 2017

Shares 450 Value ($000) $41 Avg Close $91.81 Range $82.71 - $104.71

Q4 2016

Shares 73 Value ($000) $5 Avg Close $61.46 Range $53.78 - $68.88

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2019	1,500	$207	$125.54	$101.87 - $139.48
Q3 2017	450	$39	$88.42	$81.01 - $100.00
Q2 2017	450	$41	$91.81	$82.71 - $104.71
Q4 2016	73	$5	$61.46	$53.78 - $68.88