Masimo Corporation
MX ˙ BMV ˙ US5747951003
SecurityMX:MASI / Masimo Corporation
InstitutionBaird Financial Group, Inc.
Latest Disclosed Ownership14,192 shares
Latest Disclosed Value $ 2,524,331
Baird Financial Group, Inc. reports 53.74% decrease in ownership of MASI / Masimo Corporation

On May 14, 2026 - Baird Financial Group, Inc. filed a 13F-HR form disclosing ownership of 14,192 shares of Masimo Corporation (MX:MASI) valued at $2,524,331 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 30,679 shares of Masimo Corporation. This represents a change in shares of -53.74% 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)
2026-05-14 2026-03-31 13F MASIMO COM 574795100 14,192 -16,487 -53.74 2,524 -36.74 0.0021
2026-02-13 2025-12-31 13F MASIMO CORP COM COMMON 574795100 30,679 -5,155 -14.39 3,990 -24.53 0.0062
2025-11-13 2025-09-30 13F MASIMO COMMON 574795100 35,834 -4,886 -12.00 5,287 -22.81 0.0085
2025-08-13 2025-06-30 13F MASIMO CORP COM COMMON 574795100 40,720 -4,400 -9.75 6,850 -8.87 0.0120
2025-05-15 2025-03-31 13F MASIMO CORP COM COMMON 574795100 45,120 10,922 31.94 7,517 32.98 0.0145
2025-02-14 2024-12-31 13F MASIMO COMMON 574795100 34,198 26,914 369.49 5,653 482.08 0.0108
2024-11-14 2024-09-30 13F MASIMO COMMON 574795100 7,284 2,900 66.15 971 75.91 0.0019
2024-08-14 2024-06-30 13F MASIMO COMMON 574795100 4,384 -44 -0.99 552 -15.08 0.0011
2024-05-14 2024-03-31 13F MASIMO COMMON 574795100 4,428 16 0.36 650 25.73 0.0014
2024-02-14 2023-12-31 13F MASIMO COMMON 574795100 4,412 -170 -3.71 517 28.93 0.0012
2023-11-13 2023-09-30 13F MASIMO COMMON 574795100 4,582 -55 -1.19 402 -47.44 0.0011
2023-08-11 2023-06-30 13F MASIMO COMMON 574795100 4,637 1,878 68.07 763 49.90 0.0020
2023-05-15 2023-03-31 13F MASIMO COMMON 574795100 2,759 -84 -2.95 509 0.0013
2023-02-13 2022-12-31 13F MASIMO COMMON 574795100 2,843 209 7.93 0 -100.00 0.0011
2022-11-15 2022-09-30 13F MASIMO COMMON 574795100 2,634 -5 -0.19 372 7.83 0.0011
2022-08-08 2022-06-30 13F MASIMO COMMON 574795100 2,639 -1,513 -36.44 345 -42.88 0.0010
2022-05-13 2022-03-31 13F MASIMO COMMON 574795100 4,152 -11,893 -74.12 604 -87.14 0.0015
2022-02-09 2021-12-31 13F MASIMO COMMON 574795100 16,045 4,214 35.62 4,698 46.67 0.0110
2021-11-12 2021-09-30 13F MASIMO COMMON 574795100 11,831 1,564 15.23 3,203 28.69 0.0082
2021-08-11 2021-06-30 13F MASIMO COMMON 574795100 10,267 1,657 19.25 2,489 25.90 0.0065
2021-05-13 2021-03-31 13F MASIMO COMMON 574795100 8,610 1,686 24.35 1,977 6.40 0.0055
2021-02-11 2020-12-31 13F MASIMO COMMON 574795100 6,924 505 7.87 1,858 22.64 0.0056
2020-11-12 2020-09-30 13F MASIMO COMMON 574795100 6,419 2,840 79.35 1,515 85.66 0.0052
2020-10-22 2020-06-30 13F/A-1 MASIMO COMMON 574795100 3,579 -397 -9.98 816 15.91 0.0031
2020-08-14 2020-06-30 13F MASIMO COMMON 574795100 4,626 650 731 1,448.6759
2020-05-14 2020-03-31 13F MASIMO COMMON 574795100 3,976 -931 -18.97 704 -9.28 0.0032
2020-02-14 2019-12-31 13F MASIMO COMMON 574795100 4,907 -23,302 -82.60 776 -81.51 0.0028
2019-11-14 2019-09-30 13F MASIMO Common 574795100 28,209 -467 -1.63 4,197 -1.66 0.0165
2019-08-14 2019-06-30 13F MASIMO COMMON 574795100 28,676 26,834 1,456.79 4,268 1,573.73 0.0166
2019-05-14 2019-03-31 13F MASIMO COMMON 574795100 1,842 -941 -33.81 255 -14.72 0.0015
2019-02-14 2018-12-31 13F MASIMO COMMON 574795100 2,783 2,783 299 0.0020
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.