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Masimo
MASI

Overview Fund Activity

392 hedge funds and large institutions have $9.03B invested in Masimo in 2025 Q1 according to their latest regulatory filings, with 80 funds opening new positions, 134 increasing their positions, 117 reducing their positions, and 47 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
392
Holders Change
+29
Holders Change %
+7.99%
% of All Funds
5.32%
Holding in Top 10
4
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.05%
New
80
Increased
134
Reduced
117
Closed
47
Calls
$7.35M
Puts
$5.71M
Net Calls
+$1.63M
Net Calls Change
-$7.13M

Top Buyers

1
BlackRock
BlackRock
New York
+$195M
2
DCP
Durable Capital Partners
Maryland
+$188M
3
Holocene Advisors
Holocene Advisors
New York
+$82.9M
4
Artisan Partners
Artisan Partners
Wisconsin
+$49.8M
5
Massachusetts Financial Services
Massachusetts Financial Services
Massachusetts
+$38.8M

Top Sellers

1
Capital Research Global Investors
Capital Research Global Investors
California
-$66.5M
2
FCM
Farallon Capital Management
California
-$65.6M
3
Citadel Advisors
Citadel Advisors
Florida
-$65.2M
4
Millennium Management
Millennium Management
New York
-$45.5M
5
Assenagon Asset Management
Assenagon Asset Management
Luxembourg
-$35.3M
Name Holding Trade Value Shares
Change 		Shares
Change %
IHAM
76
Integral Health Asset Management
New York
$7.5M +$7.5M +45,000 New
PMAM
77
Picton Mahoney Asset Management
Ontario, Canada
$7.36M +$257K +1,542 +4%
Royal Bank of Canada
78
Royal Bank of Canada
Ontario, Canada
$7.31M +$2.25M +13,513 +44%
NP
79
NS Partners
United Kingdom
$7.26M +$151K +906 +2%
California State Teachers Retirement System (CalSTRS)
80
California State Teachers Retirement System (CalSTRS)
California
$7.21M +$145K +869 +2%
State Board of Administration of Florida Retirement System
81
State Board of Administration of Florida Retirement System
Florida
$7.13M -$15K -90 -0.2%
LCM
82
Logan Capital Management
Pennsylvania
$7.06M -$898K -5,392 -11%
PD
83
Point72 (DIFC)
United Arab Emirates
$6.94M -$2.8M -16,778 -29%
SO
84
STRS Ohio
Ohio
$6.69M +$4.12M +24,735 +161%
New York State Teachers Retirement System (NYSTRS)
85
New York State Teachers Retirement System (NYSTRS)
New York
$6.67M -$866K -5,200 -11%
Barclays
86
Barclays
United Kingdom
$6.64M -$2.23M -13,366 -25%
BM
87
Bridger Management
New York
$6.55M +$6.55M +39,300 New
Allspring Global Investments
88
Allspring Global Investments
North Carolina
$6.42M -$1.75M -10,462 -21%
Amundi
89
Amundi
France
$6.27M -$10.7M -70,314 -63%
Russell Investments Group
90
Russell Investments Group
United Kingdom
$5.79M +$2.51M +15,044 +76%
GF
91
Gabelli Funds
New York
$5.5M – – –
IIM
92
INTECH Investment Management
Florida
$5.41M +$1.14M +6,872 +27%
MAM
93
Montanaro Asset Management
United Kingdom
$5.38M -$2.37M -14,200 -31%
Envestnet Asset Management
94
Envestnet Asset Management
Illinois
$5.3M +$113K +681 +2%
LCG
95
Lisanti Capital Growth
New York
$5.08M +$5.08M +30,485 New
PL
96
Perpetual Ltd
Australia
$5.03M +$5.03M +30,209 New
4A
97
4D Advisors
California
$5M +$5M +30,000 New
ZIM
98
Zacks Investment Management
Illinois
$4.63M +$96.3K +578 +2%
AAM
99
Advisors Asset Management
Colorado
$4.55M +$719K +4,314 +19%
Canada Life
100
Canada Life
Manitoba, Canada
$4.43M -$1.82M -10,948 -29%
2 3
4
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