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Masimo
MASI

Overview Fund Activity

373 hedge funds and large institutions have $9.67B invested in Masimo in 2025 Q2 according to their latest regulatory filings, with 43 funds opening new positions, 126 increasing their positions, 136 reducing their positions, and 58 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
373
Holders Change
-19
Holders Change %
-4.85%
% of All Funds
5%
Holding in Top 10
4
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.05%
New
43
Increased
126
Reduced
136
Closed
58
Calls
$10.1M
Puts
$3.87M
Net Calls
+$6.21M
Net Calls Change
+$4.58M

Top Buyers

1
T. Rowe Price Investment Management
T. Rowe Price Investment Management
Maryland
+$139M
2
Viking Global Investors
Viking Global Investors
Connecticut
+$129M
3
BlackRock
BlackRock
New York
+$107M
4
Westfield Capital Management
Westfield Capital Management
Massachusetts
+$85.7M
5
Massachusetts Financial Services
Massachusetts Financial Services
Massachusetts
+$84.5M

Top Sellers

1
Artisan Partners
Artisan Partners
Wisconsin
-$49.8M
2
Point72 Asset Management
Point72 Asset Management
Connecticut
-$49M
3
Capital Research Global Investors
Capital Research Global Investors
California
-$33.7M
4
Dimensional Fund Advisors
Dimensional Fund Advisors
Texas
-$30.3M
5
Millennium Management
Millennium Management
New York
-$22M
Name Holding Trade Value Shares
Change 		Shares
Change %
4A
76
4D Advisors
California
$7.57M +$2.52M +15,000 +50%
PMAM
77
Picton Mahoney Asset Management
Ontario, Canada
$7.49M +$68.1K +405 +0.9%
California State Teachers Retirement System (CalSTRS)
78
California State Teachers Retirement System (CalSTRS)
California
$7.29M +$17K +101 +0.2%
State Board of Administration of Florida Retirement System
79
State Board of Administration of Florida Retirement System
Florida
$7.29M +$92.2K +548 +1%
Walleye Capital
80
Walleye Capital
New York
$7.27M -$5.57M -33,138 -43%
NP
81
NS Partners
United Kingdom
$7.16M -$166K -989 -2%
Amundi
82
Amundi
France
$7.12M +$71.3K +416 +1%
Baird Financial Group
83
Baird Financial Group
Wisconsin
$6.85M -$740K -4,400 -10%
New York State Teachers Retirement System (NYSTRS)
84
New York State Teachers Retirement System (NYSTRS)
New York
$6.74M – – –
Norges Bank
85
Norges Bank
Norway
$6.57M +$6.57M +39,053 New
BM
86
Bridger Management
New York
$5.66M -$952K -5,659 -14%
GF
87
Gabelli Funds
New York
$5.5M -$50.5K -300 -0.9%
IIM
88
INTECH Investment Management
Florida
$5.34M -$125K -744 -2%
Nordea Investment Management
89
Nordea Investment Management
Sweden
$5.33M +$947K +5,659 +22%
LCM
90
Logan Capital Management
Pennsylvania
$5.27M -$1.86M -11,043 -26%
SEI Investments
91
SEI Investments
Pennsylvania
$5.13M -$3.17M -18,859 -38%
Victory Capital Management
92
Victory Capital Management
Texas
$4.94M +$505K +3,001 +11%
Envestnet Asset Management
93
Envestnet Asset Management
Illinois
$4.58M -$766K -4,554 -14%
WAM
94
Wilson Asset Management
Australia
$4.58M +$4.58M +27,234 New
HCA
95
Harbor Capital Advisors
Illinois
$4.44M +$4.44M +26,412 New
MIM
96
MetLife Investment Management
New Jersey
$4.42M +$109K +645 +3%
Canada Life
97
Canada Life
Manitoba, Canada
$4.39M -$82.8K -492 -2%
WP
98
Westmount Partners
California
$4.35M -$21K -125 -0.5%
Renaissance Technologies
99
Renaissance Technologies
New York
$4.27M +$1.75M +10,377 +69%
SDIC
100
South Dakota Investment Council
South Dakota
$4.17M – – –
2 3
4
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