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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 %
BDLIB
51
Banque de Luxembourg Investments (BLI)
Luxembourg
$16.5M – – –
Bank of Nova Scotia
52
Bank of Nova Scotia
Ontario, Canada
$15.5M +$15.5M +93,203 New
GLA
53
Great Lakes Advisors
Illinois
$15.5M -$476K -2,858 -3%
EAM
54
Erste Asset Management
Austria
$15.3M +$1.56M +9,348 +11%
TD Asset Management
55
TD Asset Management
Ontario, Canada
$14.8M +$671K +4,028 +5%
Swiss National Bank
56
Swiss National Bank
Switzerland
$14.7M -$200K -1,200 -1%
GI
57
GAMCO Investors
Connecticut
$14.1M – – –
American Century Companies
58
American Century Companies
Missouri
$13.2M +$11.1M +66,517 +525%
Walleye Capital
59
Walleye Capital
New York
$12.7M +$3.57M +21,432 +39%
Swedbank
60
Swedbank
Sweden
$12.6M +$12.6M +75,900 New
Neuberger Berman Group
61
Neuberger Berman Group
New York
$12.5M -$10.5M -63,160 -46%
BNP Paribas Financial Markets
62
BNP Paribas Financial Markets
France
$11.8M +$10.6M +63,703 +907%
California Public Employees Retirement System
63
California Public Employees Retirement System
California
$11.6M -$59K -354 -0.5%
BG
64
Bellevue Group
Switzerland
$11.6M +$7.6M +45,642 +189%
QCM
65
Quantinno Capital Management
New York
$10.6M +$9.95M +59,749 +1,497%
ECM
66
ExodusPoint Capital Management
New York
$9.96M +$5.73M +34,366 +135%
Retirement Systems of Alabama
67
Retirement Systems of Alabama
Alabama
$9.01M +$8.66K +52 +0.1%
Manulife (Manufacturers Life Insurance)
68
Manulife (Manufacturers Life Insurance)
Ontario, Canada
$8.98M +$407K +2,443 +5%
Citigroup
69
Citigroup
New York
$8.69M -$6.59M -39,533 -43%
Federated Hermes
70
Federated Hermes
Pennsylvania
$8.5M -$289K -1,732 -3%
TPSF
71
Texas Permanent School Fund
Texas
$8.34M +$8.34M +51,841 New
Citadel Advisors
72
Citadel Advisors
Florida
$8.24M -$65.2M -391,543 -89%
SEI Investments
73
SEI Investments
Pennsylvania
$8.22M +$3.79M +22,764 +86%
CF
74
Corebridge Financial
Texas
$8.22M -$201K -1,209 -2%
Baird Financial Group
75
Baird Financial Group
Wisconsin
$7.52M +$1.82M +10,922 +32%
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