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