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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 %
PA
301
Parallel Advisors
California
$66.1K – – –
NS
302
NBC Securities
Alabama
$61K +$61K +368 New
DFA
303
DHJJ Financial Advisors
Illinois
$60K – – –
LC
304
Lindbrook Capital
California
$57.6K +$8.16K +49 +16%
Jones Financial Companies
305
Jones Financial Companies
Missouri
$54.8K +$28.5K +174 +108%
HNB
306
Huntington National Bank
Ohio
$51K -$2.83K -17 -5%
BTI
307
Blue Trust Inc
Georgia
$51K +$3.33K +20 +7%
AFS
308
Anderson Financial Strategies
Ohio
$49.1K +$49.1K +295 New
SS
309
SBI Securities
Japan
$46.5K +$167 +1 +0.4%
SAM
310
Smartleaf Asset Management
Massachusetts
$42.2K +$1.31K +8 +3%
MPWT
311
MassMutual Private Wealth & Trust
Connecticut
$40.2K +$167 +1 +0.4%
EWA
312
EverSource Wealth Advisors
Alabama
$36.8K -$500 -3 -1%
AF
313
Allworth Financial
California
$36.4K +$1.95K +12 +6%
FFA
314
Farther Finance Advisors
California
$34.5K +$19.4K +116 +129%
CIBC Private Wealth Group
315
CIBC Private Wealth Group
Georgia
$34.4K +$28.6K +197 +493%
WT
316
Washington Trust
Rhode Island
$30.7K – – –
Twin Tree Management
317
Twin Tree Management
Texas
$29.2K +$29.2K +175 New
RTC
318
Riverview Trust Company
Washington
$28.2K – – –
Northwestern Mutual Wealth Management
319
Northwestern Mutual Wealth Management
Wisconsin
$25.3K – – –
Acadian Asset Management
320
Acadian Asset Management
Massachusetts
$23K +$23K +143 New
GKIM
321
GW&K Investment Management
Massachusetts
$22K +$22K +135 New
Bessemer Group
322
Bessemer Group
New Jersey
$20K -$4.13K -25 -17%
Nomura Asset Management
323
Nomura Asset Management
Japan
$20K +$20K +120 New
Optiver Holding
324
Optiver Holding
Netherlands
$19.7K +$12.3K +74 +168%
BIG
325
Brooklyn Investment Group
New York
$18.7K +$2.67K +16 +17%
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