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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 %
BlackRock
1
BlackRock
New York
$1.64B +$195M +1,173,215 +13%
Fidelity Investments
2
Fidelity Investments
Massachusetts
$1.36B +$13.5M +81,309 +1%
PCM
3
Politan Capital Management
New York
$785M – – –
Vanguard Group
4
Vanguard Group
Pennsylvania
$764M -$571K -3,426 -0.1%
Capital Research Global Investors
5
Capital Research Global Investors
California
$343M -$66.5M -398,880 -16%
Massachusetts Financial Services
6
Massachusetts Financial Services
Massachusetts
$328M +$38.8M +232,671 +13%
T. Rowe Price Investment Management
7
T. Rowe Price Investment Management
Maryland
$279M +$1.81M +10,876 +0.7%
State Street
8
State Street
Massachusetts
$246M +$2.09M +12,525 +0.9%
Holocene Advisors
9
Holocene Advisors
New York
$222M +$82.9M +497,636 +60%
DCP
10
Durable Capital Partners
Maryland
$188M +$188M +1,125,619 New
AllianceBernstein
11
AllianceBernstein
Tennessee
$144M -$13.6M -81,521 -9%
Geode Capital Management
12
Geode Capital Management
Massachusetts
$141M +$7.2M +43,193 +5%
LIP
13
Liontrust Investment Partners
United Kingdom
$125M -$7.57M -45,437 -6%
Morgan Stanley
14
Morgan Stanley
New York
$123M -$343K -2,059 -0.3%
Alyeska Investment Group
15
Alyeska Investment Group
Illinois
$120M +$24M +143,899 +25%
Dimensional Fund Advisors
16
Dimensional Fund Advisors
Texas
$117M +$9.27M +55,658 +9%
RI
17
RTW Investments
New York
$114M – – –
Westfield Capital Management
18
Westfield Capital Management
Massachusetts
$112M -$16.2M -97,379 -13%
Schroder Investment Management Group
19
Schroder Investment Management Group
United Kingdom
$71.2M -$21.4M -130,921 -23%
Northern Trust
20
Northern Trust
Illinois
$63.9M -$85.5K -513 -0.1%
Charles Schwab
21
Charles Schwab
California
$62.8M -$128K -766 -0.2%
Sumitomo Mitsui Trust Group
22
Sumitomo Mitsui Trust Group
Japan
$62.1M -$121K -727 -0.2%
Corient Private Wealth
23
Corient Private Wealth
Florida
$58M +$59.1K +355 +0.1%
Bank of New York Mellon
24
Bank of New York Mellon
New York
$55.3M -$852K -5,113 -2%
BAMCO Inc
25
BAMCO Inc
New York
$52.9M +$1.69M +10,138 +3%
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