MASIMO CORP

Ticker: MASI CUSIP: 574795100 Class: Common Stock

Atom Investors LP's Holding History (CIK: 0001738902)

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

Q4 2018

Shares 2,125 Value ($000) $228 Avg Close $111.51 Range $98.23 - $126.89

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2018	2,125	$228	$111.51	$98.23 - $126.89