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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 %
SSA
151
Schonfeld Strategic Advisors
New York
$1.71M +$1.05M +6,290 +158%
NICM
152
Neo Ivy Capital Management
New York
$1.71M +$1.71M +10,248 New
VRS
153
Virginia Retirement Systems
Virginia
$1.7M +$1.7M +10,197 New
NMERB
154
New Mexico Educational Retirement Board
New Mexico
$1.65M – – –
NMIMC
155
Northwestern Mutual Investment Management Company
Wisconsin
$1.65M +$833 +5 +0.1%
TC
156
TownSquare Capital
Utah
$1.64M +$291K +1,744 +21%
IMRF
157
Illinois Municipal Retirement Fund
Illinois
$1.55M – – –
OPERF
158
Oregon Public Employees Retirement Fund
Oregon
$1.5M -$10K -60 -0.7%
KK
159
KLP Kapitalforvaltning
Norway
$1.48M -$83.3K -500 -5%
FAM
160
Fred Alger Management
New York
$1.46M -$1.94M -11,658 -57%
AIP
161
Ameritas Investment Partners
Nebraska
$1.46M -$26.2K -157 -2%
FCM
162
Fieldview Capital Management
Michigan
$1.45M +$1.45M +8,675 New
DBG
163
De Burlo Group
Massachusetts
$1.4M -$25K -150 -2%
Zurich Cantonal Bank
164
Zurich Cantonal Bank
Switzerland
$1.37M – – –
MUAMU
165
Mitsubishi UFJ Asset Management (UK)
United Kingdom
$1.33M +$1.33M +8,000 New
AQR Capital Management
166
AQR Capital Management
Connecticut
$1.3M +$753K +4,700 +137%
EGM
167
Engineers Gate Manager
New York
$1.29M +$1.29M +7,754 New
CC
168
Centiva Capital
New York
$1.25M +$1.25M +7,530 New
AG
169
Algert Global
California
$1.22M +$1.22M +7,310 New
X
170
Xponance
Pennsylvania
$1.18M +$12.7K +76 +1%
VI
171
Versor Investments
New York
$1.16M +$1.16M +6,978 New
Pictet Asset Management
172
Pictet Asset Management
Switzerland
$1.13M +$66.4K +399 +6%
RA
173
RFG Advisory
Alabama
$1.13M +$479K +2,875 +74%
Universal-Beteiligungs- und Servicegesellschaft
174
Universal-Beteiligungs- und Servicegesellschaft
Germany
$1.07M +$1.07M +6,405 New
SPC
175
Sigma Planning Corp
Michigan
$1.06M +$500K +3,000 +89%
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