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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 %
Vontobel Holding
276
Vontobel Holding
Switzerland
$232K -$69.6K -418 -23%
KP
277
Keel Point
Alabama
$227K +$6.16K +37 +3%
TRCT
278
Tower Research Capital (TRC)
New York
$225K -$206K -1,238 -48%
DTL
279
Dynamic Technology Lab
Singapore
$220K +$220K +1,320 New
FFM
280
Forum Financial Management
Illinois
$219K +$333 +2 +0.2%
GT
281
Greenleaf Trust
Michigan
$219K +$9.5K +57 +5%
Wellington Management Group
282
Wellington Management Group
Massachusetts
$216K +$216K +1,297 New
JG
283
Jain Global
New York
$212K +$212K +1,274 New
HWM
284
HB Wealth Management
Georgia
$212K +$9.33K +56 +5%
BP
285
Ballentine Partners
Massachusetts
$206K +$206K +1,236 New
CIS
286
Custom Index Systems
New York
$205K +$205K +1,230 New
WT
287
Whittier Trust
California
$193K – – –
Carson Wealth (CWM LLC)
288
Carson Wealth (CWM LLC)
Nebraska
$192K +$2.5K +15 +1%
HIA
289
Harbor Investment Advisory
Maryland
$162K – – –
Osaic Holdings
290
Osaic Holdings
Arizona
$159K -$18.2K -109 -10%
UCB
291
United Community Bank
South Carolina
$157K -$833 -5 -0.5%
GI
292
GAMMA Investing
California
$123K +$45.3K +272 +58%
CI Investments Inc
293
CI Investments Inc
Ontario, Canada
$122K +$108K +649 +791%
Fifth Third Bancorp
294
Fifth Third Bancorp
Ohio
$108K +$6.33K +38 +6%
CMBA
295
C.M. Bidwell & Associates
Hawaii
$99.5K -$2.83K -17 -3%
BC
296
Barrett & Company
Rhode Island
$94.4K – – –
PAS
297
Point72 Asia (Singapore)
Singapore
$78.1K +$78.1K +469 New
QL
298
Quarry LP
New York
$74.8K +$53.6K +322 +254%
UB
299
UMB Bank
Missouri
$74.5K +$42.6K +256 +134%
S
300
SignatureFD
Georgia
$69.6K -$833 -5 -1%
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