MASIMO CORP

Ticker: MASI CUSIP: 574795100 Class: Common Stock

GW&K Investment Management, LLC's Holding History (CIK: 0001082917)

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

Q4 2025

Shares 119,362 Value ($000) $16 Avg Close $143.19 Range $129.77 - $157.72

Q3 2025

Shares 124,047 Value ($000) $18 Avg Close $151.39 Range $135.34 - $172.55

Q2 2025

Shares 135 Value ($000) $0 Avg Close $159.72 Range $133.70 - $174.50

Q1 2025

Shares 135 Value ($000) $0 Avg Close $173.51 Range $159.29 - $194.88

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	119,362	$16	$143.19	$129.77 - $157.72
Q3 2025	124,047	$18	$151.39	$135.34 - $172.55
Q2 2025	135	$0	$159.72	$133.70 - $174.50
Q1 2025	135	$0	$173.51	$159.29 - $194.88