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Masimo
MASI

Overview Fund Activity

373 hedge funds and large institutions have $9.67B invested in Masimo in 2025 Q2 according to their latest regulatory filings, with 43 funds opening new positions, 126 increasing their positions, 136 reducing their positions, and 58 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
373
Holders Change
-19
Holders Change %
-4.85%
% of All Funds
5%
Holding in Top 10
4
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.05%
New
43
Increased
126
Reduced
136
Closed
58
Calls
$10.1M
Puts
$3.87M
Net Calls
+$6.21M
Net Calls Change
+$4.58M

Top Buyers

1
T. Rowe Price Investment Management
T. Rowe Price Investment Management
Maryland
+$139M
2
Viking Global Investors
Viking Global Investors
Connecticut
+$129M
3
BlackRock
BlackRock
New York
+$107M
4
Westfield Capital Management
Westfield Capital Management
Massachusetts
+$85.7M
5
Massachusetts Financial Services
Massachusetts Financial Services
Massachusetts
+$84.5M

Top Sellers

1
Artisan Partners
Artisan Partners
Wisconsin
-$49.8M
2
Point72 Asset Management
Point72 Asset Management
Connecticut
-$49M
3
Capital Research Global Investors
Capital Research Global Investors
California
-$33.7M
4
Dimensional Fund Advisors
Dimensional Fund Advisors
Texas
-$30.3M
5
Millennium Management
Millennium Management
New York
-$22M
Name Holding Trade Value Shares
Change 		Shares
Change %
BlackRock
1
BlackRock
New York
$1.77B +$107M +635,898 +6%
Fidelity Investments
2
Fidelity Investments
Massachusetts
$1.38B +$439K +2,609 +0%
PCM
3
Politan Capital Management
New York
$793M +$301K +1,790 +0%
Vanguard Group
4
Vanguard Group
Pennsylvania
$780M +$9.23M +54,859 +1%
T. Rowe Price Investment Management
5
T. Rowe Price Investment Management
Maryland
$421M +$139M +826,892 +49%
Massachusetts Financial Services
6
Massachusetts Financial Services
Massachusetts
$416M +$84.5M +502,555 +26%
Capital Research Global Investors
7
Capital Research Global Investors
California
$312M -$33.7M -200,425 -10%
State Street
8
State Street
Massachusetts
$250M +$1.75M +10,403 +0.7%
Holocene Advisors
9
Holocene Advisors
New York
$209M -$15.1M -89,689 -7%
Westfield Capital Management
10
Westfield Capital Management
Massachusetts
$199M +$85.7M +509,724 +76%
DCP
11
Durable Capital Partners
Maryland
$196M +$6.44M +38,279 +3%
Alyeska Investment Group
12
Alyeska Investment Group
Illinois
$191M +$69.3M +411,956 +57%
Geode Capital Management
13
Geode Capital Management
Massachusetts
$151M +$8.77M +52,100 +6%
AllianceBernstein
14
AllianceBernstein
Tennessee
$142M -$3.67M -21,803 -3%
Viking Global Investors
15
Viking Global Investors
Connecticut
$129M +$129M +767,426 New
Morgan Stanley
16
Morgan Stanley
New York
$129M +$5.31M +31,593 +4%
LIP
17
Liontrust Investment Partners
United Kingdom
$119M -$6.59M -39,198 -5%
RI
18
RTW Investments
New York
$115M – – –
Dimensional Fund Advisors
19
Dimensional Fund Advisors
Texas
$88M -$30.3M -180,152 -26%
Goldman Sachs
20
Goldman Sachs
New York
$79.3M +$32.2M +191,270 +68%
Sumitomo Mitsui Trust Group
21
Sumitomo Mitsui Trust Group
Japan
$79.2M +$16.5M +98,063 +26%
Schroder Investment Management Group
22
Schroder Investment Management Group
United Kingdom
$75.4M +$2.18M +12,953 +3%
T. Rowe Price Associates
23
T. Rowe Price Associates
Maryland
$68.2M +$20.7M +122,823 +43%
Ameriprise
24
Ameriprise
Minnesota
$66.4M +$30.7M +182,701 +86%
Northern Trust
25
Northern Trust
Illinois
$65.4M +$872K +5,186 +1%
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