MASIMO CORP

Ticker: MASI CUSIP: 574795100 Class: Common Stock

VIKING GLOBAL INVESTORS LP's Holding History (CIK: 0001103804)

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

Q4 2025

Shares 514,340 Value ($000) $66,895 Avg Close $143.19 Range $129.77 - $157.72

Q3 2025

Shares 1,073,433 Value ($000) $158,385 Avg Close $151.39 Range $135.34 - $172.55

Q2 2025

Shares 767,426 Value ($000) $129,096 Avg Close $159.72 Range $133.70 - $174.50

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	514,340	$66,895	$143.19	$129.77 - $157.72
Q3 2025	1,073,433	$158,385	$151.39	$135.34 - $172.55
Q2 2025	767,426	$129,096	$159.72	$133.70 - $174.50