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Masimo
MASI

Overview Fund Activity

369 hedge funds and large institutions have $9.59B invested in Masimo in 2025 Q2 according to their latest regulatory filings, with 43 funds opening new positions, 124 increasing their positions, 135 reducing their positions, and 58 closing their positions.

Holders
369
Holders Change
-23
Holders Change %
-5.87%
% of All Funds
4.96%
Holding in Top 10
4
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.05%
New
43
Increased
124
Reduced
135
Closed
58
Calls
$2.02M
Puts
$403K
Net Calls
+$1.62M
Net Calls Change
-$17K

Top Buyers

1
T. Rowe Price Investment Management
1
T. Rowe Price Investment Management
Maryland
$421M
2
Viking Global Investors
2
Viking Global Investors
Connecticut
$129M
3
BlackRock
3
BlackRock
New York
$1.77B
4
Westfield Capital Management
4
Westfield Capital Management
Massachusetts
$199M
5
Massachusetts Financial Services
5
Massachusetts Financial Services
Massachusetts
$416M

Top Sellers

1
Artisan Partners
1
Artisan Partners
Wisconsin
$0
2
Point72 Asset Management
2
Point72 Asset Management
Connecticut
$4.07M
3
Capital Research Global Investors
3
Capital Research Global Investors
California
$312M
4
Dimensional Fund Advisors
4
Dimensional Fund Advisors
Texas
$88M
5
Millennium Management
5
Millennium Management
New York
$657K
Name Market Value Shares Shares
Change 		Shares
Change %
BlackRock
1
BlackRock
New York
$1.77B 10,507,326 +635,898 +6%
Fidelity Investments
2
Fidelity Investments
Massachusetts
$1.38B 8,181,372 +2,609 +0%
PCM
3
Politan Capital Management
New York
$793M 4,716,536 +1,790 +0%
Vanguard Group
4
Vanguard Group
Pennsylvania
$780M 4,638,135 +54,859 +1%
T. Rowe Price Investment Management
5
T. Rowe Price Investment Management
Maryland
$421M 2,500,144 +826,892 +49%
Massachusetts Financial Services
6
Massachusetts Financial Services
Massachusetts
$416M 2,470,393 +502,555 +26%
Capital Research Global Investors
7
Capital Research Global Investors
California
$312M 1,855,670 -200,425 -10%
State Street
8
State Street
Massachusetts
$250M 1,486,394 +10,403 +0.7%
Holocene Advisors
9
Holocene Advisors
New York
$209M 1,243,607 -89,689 -7%
Westfield Capital Management
10
Westfield Capital Management
Massachusetts
$199M 1,181,203 +509,724 +76%
DCP
11
Durable Capital Partners
Maryland
$196M 1,163,898 +38,279 +3%
Alyeska Investment Group
12
Alyeska Investment Group
Illinois
$191M 1,134,490 +411,956 +57%
Geode Capital Management
13
Geode Capital Management
Massachusetts
$151M 896,418 +52,100 +6%
AllianceBernstein
14
AllianceBernstein
Tennessee
$142M 844,067 -21,803 -3%
Viking Global Investors
15
Viking Global Investors
Connecticut
$129M 767,426 +767,426 New
Morgan Stanley
16
Morgan Stanley
New York
$129M 767,375 +31,593 +4%
LIP
17
Liontrust Investment Partners
United Kingdom
$119M 708,300 -39,198 -5%
RI
18
RTW Investments
New York
$115M 683,294 – –
Dimensional Fund Advisors
19
Dimensional Fund Advisors
Texas
$88M 523,226 -180,152 -26%
Goldman Sachs
20
Goldman Sachs
New York
$79.3M 471,525 +191,270 +68%
Sumitomo Mitsui Trust Group
21
Sumitomo Mitsui Trust Group
Japan
$79.2M 471,041 +98,063 +26%
T. Rowe Price Associates
22
T. Rowe Price Associates
Maryland
$68.2M 405,460 +122,823 +43%
Ameriprise
23
Ameriprise
Minnesota
$66.4M 394,487 +182,701 +86%
Northern Trust
24
Northern Trust
Illinois
$65.4M 388,542 +5,186 +1%
BAMCO Inc
25
BAMCO Inc
New York
$64.7M 384,589 +67,307 +21%
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