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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 %
Brown Advisory
126
Brown Advisory
Maryland
$2.61M +$7.4K +44 +0.3%
Two Sigma Investments
127
Two Sigma Investments
New York
$2.6M -$1.63M -9,700 -39%
TRSOTSOK
128
Teachers Retirement System of the State of Kentucky
Kentucky
$2.49M – – –
SG Americas Securities
129
SG Americas Securities
New York
$2.48M +$2.21M +13,143 +810%
Ohio Public Employees Retirement System (OPERS)
130
Ohio Public Employees Retirement System (OPERS)
Ohio
$2.41M +$101K +598 +4%
SSA
131
Schonfeld Strategic Advisors
New York
$2.4M +$668K +3,969 +39%
Empower Advisory Group
132
Empower Advisory Group
Colorado
$2.37M – – –
ASRS
133
Arizona State Retirement System
Arizona
$2.25M +$60.1K +357 +3%
LFG
134
Lockerman Financial Group
California
$2.2M – – –
LSERS
135
Louisiana State Employees Retirement System
Louisiana
$2.14M +$50.5K +300 +2%
IMRF
136
Illinois Municipal Retirement Fund
Illinois
$2.09M +$523K +3,111 +33%
Handelsbanken Fonder
137
Handelsbanken Fonder
Sweden
$2.07M -$101K -600 -5%
FAM
138
Fred Alger Management
New York
$2.05M +$574K +3,413 +39%
Teacher Retirement System of Texas
139
Teacher Retirement System of Texas
Texas
$1.96M -$268K -1,592 -12%
COPPSERS
140
Commonwealth of Pennsylvania Public School Employees Retirement System
Pennsylvania
$1.94M +$158K +939 +9%
PCMI
141
Paradigm Capital Management Inc
New York
$1.91M – – –
Creative Planning
142
Creative Planning
Kansas
$1.88M -$8.08K -48 -0.4%
Mirae Asset Global ETFs Holdings
143
Mirae Asset Global ETFs Holdings
Hong Kong
$1.86M -$52K -309 -3%
Russell Investments Group
144
Russell Investments Group
United Kingdom
$1.84M -$4.01M -23,812 -69%
XT
145
XTX Topco
Cayman Islands
$1.82M +$1.82M +10,837 New
SOMRS
146
State of Michigan Retirement System
Michigan
$1.82M +$33.6K +200 +2%
Thrivent Financial for Lutherans
147
Thrivent Financial for Lutherans
Minnesota
$1.78M +$29.8K +177 +2%
GCM
148
Graham Capital Management
Connecticut
$1.76M +$1.76M +10,480 New
NMIMC
149
Northwestern Mutual Investment Management Company
Wisconsin
$1.69M +$27.9K +166 +2%
WSFS
150
Wilmington Savings Fund Society
Delaware
$1.67M -$217K -1,290 -11%
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