MASI — MASIMO CORP
Public company
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For educational research only.InvestorLens analyzes public regulatory filings (SEC EDGAR, STOCK Act PTRs) that may be delayed by 45 days or more. Information shown is historical and is not financial, legal, or tax advice, nor a recommendation or solicitation to buy or sell any security. Always do your own research.
InvestorLens aggregates public filing data to show which tracked investors reported holdings in this stock. Dollar values represent reported position values, not market capitalization, and may be delayed up to 45 days. Not a recommendation.
Sourced from SEC EDGAR public filings
Tracked investors currently reporting MASI
7 tracked investors have since exited this position — listed separately below.
- No tracked investors hold this ticker.
Previously held MASI
These investors reported MASI in an earlier quarter but not in their most recent 13F. Figures below are their last reported position, not a current holding.
| Investor | Firm | Last reported shares | Value then | Last held |
|---|---|---|---|---|
| Izzy Englander | Millennium Management | 1.3M | $227.2M | Mar 31, 2026 |
| Andreas Halvorsen | Viking Global Investors | 514.3K | $66.9M | Dec 31, 2025 |
| Steve Cohen | Point72 Asset Management | 24.2K | $4.1M | Jun 30, 2025 |
| Ken Griffin | Citadel Advisors | 332.8K | $59.2M | Mar 31, 2026 |
| Paul Tudor Jones | Tudor Investment Corp | 347.4K | $61.8M | Mar 31, 2026 |
| George Soros | Soros Fund Management | 100.8K | $17.9M | Mar 31, 2026 |
| Ray Dalio | Bridgewater Associates | 1.9K | $337.8K | Mar 31, 2026 |
Recent activity
- $129.1MAug 14, 2025
- Increased$158.4M(39.87%)Nov 14, 2025
- Reduced$66.9M(-52.08%)Feb 17, 2026
- $0(-100.00%)May 15, 2026
- New$17.9MMay 15, 2026
- Sold$0(-100.00%)Aug 14, 2026
- New$14.9KNov 14, 2025
- Reduced$6.7K(-49.33%)Feb 17, 2026
- Reduced$5.4M(-14.00%)Feb 14, 2024
- Reduced$2M(-69.63%)May 14, 2024
- Reduced$1.3M(-24.66%)Aug 14, 2024
- Reduced$1M(-27.19%)Nov 13, 2024
- Increased$1.9M(49.55%)Feb 13, 2025
- Reduced$352.9K(-81.41%)May 14, 2025
- Reduced$276.7K(-22.33%)Aug 13, 2025
- Increased$252(4.19%)Nov 13, 2025
- Reduced$210(-5.54%)Feb 13, 2026
- Increased$337.8K(17.29%)May 15, 2026
- Sold$0(-100.00%)Aug 14, 2026
- Reduced$8M(-91.15%)Nov 14, 2024
- Increased$49.3M(397.50%)Feb 14, 2025
- Increased$52.5M(5.67%)Jul 21, 2025
- Reduced$4.1M(-92.32%)Aug 14, 2025
- Sold$0(-100.00%)Nov 14, 2025
- New$4.7MNov 13, 2023
- New$85.3MSep 16, 2024