Companies / Masimo Corporation / Activity

Activity — Masimo Corporation

155 moves.

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InsidersInstitutions
DateActorActionSecurityValueShares ΔPosition afterImpact
Q2 2026
as of
BlackRock, Inc.
13F manager
ExitCommon stock$-1.15B-8.9M
-100.00%
0
high
Q1 2026
as of
Hbk Investments L P
13F manager
NewCommon stock$458.21M+2.6M
2,576,109
4.92% of shares
high
Q1 2026
as of
Westfield Capital Management Company, L.P.
13F manager
TrimCommon stock$-210.03M-1.2M
-77.58%
341,229
0.65% of shares
high
Q2 2026
as of
State Street Corporation
13F manager
ExitCommon stock$-184.06M-1.4M
-100.00%
0
high
Q1 2026
as of
Millennium Management LLC
13F manager
AddCommon stock$142.45M+801K
+426.08%
988,853
1.89% of shares
high
Q1 2026
as of
Balyasny Asset Management L.P.
13F manager
NewCommon stock$137.14M+771K
770,986
1.47% of shares
high
Q1 2026
as of
Magnetar Financial LLC
13F manager
AddCommon stock$74.99M+422K
+7729.17%
427,081
0.82% of shares
high
Q1 2026
as of
AQR Arbitrage LLC
13F manager
NewCommon stock$73.87M+417K
416,956
0.80% of shares
high
Q1 2026
as of
Schroder Investment Management Group
13F manager
TrimCommon stock$-67.26M-379K
-79.77%
96,179
0.18% of shares
high
Q1 2026
as of
Viking Global Investors LP
13F manager
ExitCommon stock$-66.90M-514K
-100.00%
0
high
Q1 2026
as of
Hudson Bay Capital Management LP
13F manager
NewCommon stock$58.82M+331K
330,679
0.63% of shares
high
Q1 2026
as of
AllianceBernstein L.P.
13F manager
AddCommon stock$52.17M+401K
+739.78%
455,354
0.87% of shares
high
Q1 2026
as of
Norges Bank
13F manager
ExitCommon stock$-49.09M-377K
-100.00%
0
medium
Q1 2026
as of
Bamco Inc /Ny
13F manager
ExitCommon stock$-48.63M-374K
-100.00%
0
medium
Q1 2026
as of
Whitebox Advisors LLC
13F manager
NewCommon stock$48.03M+270K
270,001
0.52% of shares
medium
Q1 2026
as of
AQR Capital Management, LLC
13F manager
TrimCommon stock$-45.95M-259K
-23.77%
831,966
1.59% of shares
medium
Q4 2025
as of
Norges Bank
13F manager
AddCommon stock$43.96M+338K
+857.58%
377,421
0.72% of shares
medium
Q1 2026
as of
Polar Asset Management Partners Inc.
13F manager
NewCommon stock$41.27M+232K
232,026
0.44% of shares
medium
Q1 2026
as of
Amundi
13F manager
AddCommon stock$35.45M+199K
+454.36%
243,143
0.46% of shares
medium
Q1 2026
as of
Water Island Capital LLC
13F manager
NewCommon stock$34.54M+194K
194,197
0.37% of shares
medium
Q1 2026
as of
Alpine Associates Management Inc.
13F manager
NewCommon stock$33.62M+189K
189,000
0.36% of shares
medium
Q1 2026
as of
Renaissance Technologies LLC
13F manager
AddCommon stock$31.95M+180K
+299.83%
239,500
0.46% of shares
medium
Q1 2026
as of
Arrowstreet Capital, Limited Partnership
13F manager
NewCommon stock$30.70M+173K
172,588
0.33% of shares
medium
Q1 2026
as of
CPPIB Crestone Peak Resources Canada Inc.
13F manager
AddCommon stock$30.42M+171K
+444.16%
209,500
0.40% of shares
medium
Q1 2026
as of
Champlain Investment Partners, LLC
13F manager
NewCommon stock$25.13M+141K
141,284
0.27% of shares
medium
Q1 2026
as of
TIG Advisors, LLC
13F manager
NewCommon stock$24.05M+135K
135,197
0.26% of shares
medium
Q1 2026
as of
Marshall Wace, LLP
13F manager
TrimCommon stock$-22.88M-129K
-58.66%
90,657
0.17% of shares
medium
Q1 2026
as of
Weiss Asset Management LP
13F manager
NewCommon stock$20.03M+113K
112,600
0.22% of shares
medium
Q1 2026
as of
Nomura Holdings Inc
13F manager
NewCommon stock$19.46M+109K
109,390
0.21% of shares
medium
Q1 2026
as of
Soros Fund Management LLC
13F manager
NewCommon stock$17.94M+101K
100,838
0.19% of shares
medium
Q1 2026
as of
Gabelli Funds LLC
13F manager
AddCommon stock$16.61M+93K
+285.57%
126,082
0.24% of shares
medium
Q4 2025
as of
Bank of America Corp /De
13F manager
TrimCommon stock$-15.65M-120K
-29.71%
284,702
0.54% of shares
medium
Q1 2026
as of
TD Asset Management Inc
13F manager
ExitCommon stock$-14.89M-115K
-100.00%
0
medium
Q1 2026
as of
D. E. Shaw & Co., Inc.
13F manager
TrimCommon stock$-8.22M-46K
-70.02%
19,789
0.04% of shares
medium
Q1 2026
as of
Mariner, LLC
13F manager
AddCommon stock$7.08M+40K
+185.63%
61,265
0.12% of shares
medium
Q1 2026
as of
Fortress Investment Group LLC
13F manager
NewCommon stock$6.39M+36K
35,900
0.07% of shares
medium
Q2 2024
as of
Barclays PLC
13F manager
TrimCommon stock$-6.32M-50K
-76.04%
15,820
0.03% of shares
medium
Q1 2026
as of
Capital Fund Management S.A.
13F manager
ExitCommon stock$-6.19M-48K
-100.00%
0
medium
Q1 2026
as of
Natixis
13F manager
AddCommon stock$4.13M+23K
+1015.27%
25,495
0.05% of shares
low
Q1 2026
as of
Credit Industriel Et Commercial
13F manager
NewCommon stock$4.10M+23K
23,050
0.04% of shares
low
Q1 2026
as of
New York Life Investment Management LLC
13F manager
NewCommon stock$3.95M+22K
22,191
0.04% of shares
low
Q1 2026
as of
ING Groep NV
13F manager
NewCommon stock$3.86M+22K
21,700
0.04% of shares
low
Q1 2026
as of
Nordea Investment Management AB
13F manager
ExitCommon stock$-3.69M-28K
-100.00%
0
low
Q1 2026
as of
Campbell & CO Investment Adviser LLC
13F manager
ExitCommon stock$-3.61M-28K
-100.00%
0
low
Q3 2024
as of
Barclays PLC
13F manager
AddCommon stock$3.22M+24K
+152.57%
39,957
0.08% of shares
low
Q3 2025
as of
Barclays PLC
13F manager
AddCommon stock$3.20M+22K
+38.65%
77,804
0.15% of shares
low
Q2 2025
as of
Barclays PLC
13F manager
AddCommon stock$2.74M+16K
+40.80%
56,114
0.11% of shares
low
Q1 2026
as of
P Schoenfeld Asset Management LP
13F manager
NewCommon stock$2.67M+15K
15,000
0.03% of shares
low
Q4 2025
as of
Barclays PLC
13F manager
TrimCommon stock$-2.53M-19K
-24.99%
58,358
0.11% of shares
low
Q1 2024
as of
Barclays PLC
13F manager
AddCommon stock$2.46M+17K
+34.06%
66,040
0.13% of shares
low
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