Masimo Corporation
MX ˙ BMV ˙ US5747951003
SecurityMX:MASI / Masimo Corporation
InstitutionHighTower Advisors, LLC
Latest Disclosed Ownership5,024 shares
Latest Disclosed Value $ 893,619
HighTower Advisors, LLC reports 34.08% increase in ownership of MASI / Masimo Corporation

On May 5, 2026 - HighTower Advisors, LLC filed a 13F-HR form disclosing ownership of 5,024 shares of Masimo Corporation (MX:MASI) valued at $893,619 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 3,747 shares of Masimo Corporation. This represents a change in shares of 34.08% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-05 2026-03-31 13F MASIMO COM 574795100 5,024 1,277 34.08 894 83.37 0.0009
2026-02-06 2025-12-31 13F MASIMO COM 574795100 3,747 -406 -9.78 487 -20.42 0.0005
2025-11-07 2025-09-30 13F MASIMO COM 574795100 4,153 264 6.79 613 -6.42 0.0007
2025-08-11 2025-06-30 13F MASIMO COM 574795100 3,889 -661 -14.53 654 -13.72 0.0008
2025-05-13 2025-03-31 13F MASIMO COM 574795100 4,550 -2,263 -33.22 758 -32.68 0.0010
2025-02-07 2024-12-31 13F MASIMO COM 574795100 6,813 2,003 41.64 1,126 75.94 0.0015
2024-11-14 2024-09-30 13F MASIMO COM 574795100 4,810 -408 -7.82 640 -4.48 0.0009
2024-08-13 2024-06-30 13F MASIMO COM 574795100 5,218 591 12.77 670 -2.19 0.0010
2024-05-06 2024-03-31 13F MASIMO COM 574795100 4,627 1,555 50.62 685 90.81 0.0011
2024-02-12 2023-12-31 13F MASIMO COM 574795100 3,072 -187 -5.74 359 25.96 0.0006
2023-11-08 2023-09-30 13F MASIMO COM 574795100 3,259 -1,177 -26.53 285 -60.80 0.0005
2023-08-14 2023-06-30 13F MASIMO COM 574795100 4,436 2,298 107.48 727 84.05 0.0014
2023-05-12 2023-03-31 13F MASIMO COM 574795100 2,138 72 3.48 395 29.08 0.0009
2023-02-09 2022-12-31 13F MASIMO COM 574795100 2,066 -393 -15.98 306 -12.07 0.0007
2022-11-09 2022-09-30 13F MASIMO COM 574795100 2,459 275 12.59 348 21.68 0.0009
2022-08-10 2022-06-30 13F MASIMO COM 574795100 2,184 472 27.57 286 15.32 0.0007
2022-05-12 2022-03-31 13F MASIMO COM 574795100 1,712 -2,283 -57.15 248 -78.88 0.0006
2022-02-10 2021-12-31 13F MASIMO COM 574795100 3,995 -7,019 -63.73 1,174 -60.55 0.0026
2021-11-12 2021-09-30 13F MASIMO COM 574795100 11,014 151 1.39 2,976 12.90 0.0080
2021-08-06 2021-06-30 13F MASIMO COM 574795100 10,863 675 6.63 2,636 12.65 0.0076
2021-05-10 2021-03-31 13F MASIMO COM 574795100 10,188 270 2.72 2,340 -11.93 0.0074
2021-02-10 2020-12-31 13F MASIMO COM 574795100 9,918 -419 -4.05 2,657 8.94 0.0111
2020-11-13 2020-09-30 13F MASIMO COM 574795100 10,337 563 5.76 2,439 9.42 0.0118
2020-08-10 2020-06-30 13F MASIMO COM 574795100 9,774 9,774 2,229 0.0122
2016-05-16 2016-03-31 13F MASIMO COM 574795100 0 -14,515 -100.00 0 -100.00
2016-05-18 2015-12-31 13F/A-1 MASIMO COM 574795100 14,515 468 3.33 600 11.11 0.0071
2016-02-12 2015-12-31 13F MASIMO COM 574795100 14,515 600
2015-11-16 2015-09-30 13F MASIMO COM 574795100 14,047 -5,630 -28.61 540 -29.23 0.0071
2015-08-11 2015-06-30 13F MASIMO COM 574795100 19,677 19,677 763 0.0122
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.