Masimo Corporation
MX ˙ BMV ˙ US5747951003
SecurityMX:MASI / Masimo Corporation
InstitutionAdvisors Asset Management, Inc.
Latest Disclosed Ownership12,080 shares
Latest Disclosed Value $ 2,148,670
Advisors Asset Management, Inc. reports 39.17% decrease in ownership of MASI / Masimo Corporation

On May 15, 2026 - Advisors Asset Management, Inc. filed a 13F-HR form disclosing ownership of 12,080 shares of Masimo Corporation (MX:MASI) valued at $2,148,670 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 19,858 shares of Masimo Corporation. This represents a change in shares of -39.17% 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)
2026-05-15 2026-03-31 13F MASIMO COM 574795100 12,080 -7,778 -39.17 2,149 -16.81 0.0357
2026-02-12 2025-12-31 13F MASIMO COM 574795100 19,858 -4,330 -17.90 2,583 -27.63 0.0434
2025-11-06 2025-09-30 13F MASIMO COM 574795100 24,188 -195 -0.80 3,569 -13.00 0.0606
2025-08-12 2025-06-30 13F MASIMO COM 574795100 24,383 -2,905 -10.65 4,102 -9.79 0.0734
2025-05-15 2025-03-31 13F MASIMO COM 574795100 27,288 4,314 18.78 4,546 19.73 0.0854
2025-02-10 2024-12-31 13F MASIMO COM 574795100 22,974 8,758 61.61 3,798 100.37 0.0700
2024-11-08 2024-09-30 13F MASIMO COM 574795100 14,216 501 3.65 1,895 9.73 0.0348
2024-08-14 2024-06-30 13F MASIMO COM 574795100 13,715 4,706 52.24 1,727 30.64 0.0337
2024-05-14 2024-03-31 13F MASIMO COM 574795100 9,009 2,187 32.06 1,323 65.46 0.0254
2024-02-14 2023-12-31 13F MASIMO COM 574795100 6,822 3,773 123.75 800 199.25 0.0163
2023-11-14 2023-09-30 13F MASIMO COM 574795100 3,049 870 39.93 267 -25.42 0.0058
2023-08-14 2023-06-30 13F MASIMO COM 574795100 2,179 2,179 359 0.0073
2023-02-13 2022-12-31 13F MASIMO COM 574795100 0 -3,404 -100.00 0 -100.00
2022-11-08 2022-09-30 13F MASIMO COM 574795100 3,404 -29 -0.84 481 7.13 0.0101
2022-08-08 2022-06-30 13F MASIMO COM 574795100 3,433 -3,816 -52.64 449 -57.44 0.0085
2022-05-17 2022-03-31 13F MASIMO COM 574795100 7,249 -5,779 -44.36 1,055 -72.34 0.0162
2022-02-15 2021-12-31 13F MASIMO COM 574795100 13,028 -1,428 -9.88 3,814 -2.53 0.0545
2021-11-12 2021-09-30 13F MASIMO COM 574795100 14,456 -1,937 -11.82 3,913 -1.53 0.0595
2021-07-30 2021-06-30 13F MASIMO COM 574795100 16,393 -5,343 -24.58 3,974 -20.39 0.0586
2021-05-07 2021-03-31 13F MASIMO COM 574795100 21,736 2,949 15.70 4,992 -0.99 0.0776
2021-02-12 2020-12-31 13F MASIMO COM 574795100 18,787 4,213 28.91 5,042 46.57 0.0834
2020-11-16 2020-09-30 13F MASIMO COM 574795100 14,574 1,799 14.08 3,440 18.09 0.0636
2020-08-12 2020-06-30 13F MASIMO COM 574795100 12,775 4,055 46.50 2,913 88.67 0.0567
2020-05-15 2020-03-31 13F MASIMO COM 574795100 8,720 5,053 137.80 1,544 166.21 0.0367
2020-05-20 2019-12-31 13F/A-1 MASIMO COM 574795100 3,667 994 37.19 580 45.73 0.0102
2020-02-14 2019-12-31 13F MASIMO COM 574795100 3,667 994 580 5,133.5484
2019-11-14 2019-09-30 13F MASIMO COM 574795100 2,673 2,036 319.62 398 318.95 0.0073
2019-11-14 2019-06-30 13F/A-1 MASIMO COM 574795100 637 637 95 0.0017
2019-08-14 2019-06-30 13F MASIMO COM 574795100 637 637 95
2014-08-14 2014-06-30 13F MASIMO COM 574795100 0 -1,600 -100.00 0 -100.00
2014-05-15 2014-03-31 13F MASIMO COM 574795100 1,600 0 0.00 44 -6.38 0.0007
2014-02-03 2013-12-31 13F MASIMO COM 574795100 1,600 0 0.00 47 9.30 0.0008
2013-11-15 2013-09-30 13F MASIMO COM 574795100 1,600 -100 -5.88 43 19.44 0.0008
2013-08-14 2013-06-30 13F MASIMO COM 574795100 1,700 1,700 36 0.0007
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.