馬西莫公司
MX ˙ BMV ˙ US5747951003
SecurityMX:MASI / Masimo Corporation
InstitutionNorthern Trust Corp
Latest Disclosed Ownership390,437 shares
Latest Disclosed Value $ 69,447,030
Northern Trust Corp reports 2.62% increase in ownership of MASI / Masimo Corporation

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 390,437 shares of Masimo Corporation (MX:MASI) valued at $69,447,030 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 380,464 shares of Masimo Corporation. This represents a change in shares of 2.62% 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 390,437 9,973 2.62 69,447 40.35 0.0092
2026-02-17 2025-12-31 13F MASIMO COM 574795100 380,464 -11,678 -2.98 49,483 -14.48 0.0063
2025-11-14 2025-09-30 13F MASIMO COM 574795100 392,142 3,600 0.93 57,861 -11.47 0.0074
2025-08-13 2025-06-30 13F MASIMO COM 574795100 388,542 5,186 1.35 65,361 2.34 0.0090
2025-05-13 2025-03-31 13F MASIMO COM 574795100 383,356 -513 -0.13 63,867 0.65 0.0095
2025-02-14 2024-12-31 13F MASIMO COM 574795100 383,869 82,828 27.51 63,454 58.09 0.0090
2024-11-13 2024-09-30 13F MASIMO COM 574795100 301,041 -16,262 -5.13 40,138 0.44 0.0066
2024-08-14 2024-06-30 13F MASIMO COM 574795100 317,303 39,852 14.36 39,961 -1.92 0.0067
2024-05-14 2024-03-31 13F MASIMO COM 574795100 277,451 -69,902 -20.12 40,744 0.07 0.0070
2024-02-13 2023-12-31 13F MASIMO COM 574795100 347,353 13,577 4.07 40,713 39.12 0.0074
2023-11-13 2023-09-30 13F MASIMO COM 574795100 333,776 -83,768 -20.06 29,265 -57.41 0.0057
2023-08-11 2023-06-30 13F MASIMO COM 574795100 417,544 -45,190 -9.77 68,707 -19.54 0.0132
2023-05-15 2023-03-31 13F MASIMO COM 574795100 462,734 1,098 0.24 85,393 25.03 0.0169
2023-02-13 2022-12-31 13F MASIMO COM 574795100 461,636 -6,192 -1.32 68,299 3.42 0.0143
2022-11-14 2022-09-30 13F MASIMO COM 574795100 467,828 -35,694 -7.09 66,039 0.37 0.0151
2022-08-12 2022-06-30 13F MASIMO COM 574795100 503,522 -51,338 -9.25 65,796 -18.52 0.0141
2022-05-13 2022-03-31 13F MASIMO COM 574795100 554,860 -4,821 -0.86 80,755 -50.72 0.0142
2022-02-08 2021-12-31 13F MASIMO COM 574795100 559,681 -8,110 -1.43 163,864 6.61 0.0268
2021-11-15 2021-09-30 13F MASIMO COM 574795100 567,791 36,369 6.84 153,708 19.30 0.0272
2021-08-13 2021-06-30 13F MASIMO COM 574795100 531,422 -2,988 -0.56 128,842 4.98 0.0227
2021-05-12 2021-03-31 13F MASIMO COM 574795100 534,410 32,846 6.55 122,733 -8.82 0.0228
2021-02-11 2020-12-31 13F MASIMO COM 574795100 501,564 -1,916 -0.38 134,609 13.26 0.0262
2020-11-16 2020-09-30 13F MASIMO COM 574795100 503,480 -20,329 -3.88 118,851 -0.48 0.0261
2020-08-14 2020-06-30 13F MASIMO COM 574795100 523,809 123,342 30.80 119,424 68.37 0.0283
2020-05-14 2020-03-31 13F MASIMO COM 574795100 400,467 12,676 3.27 70,931 15.72 0.0204
2020-02-14 2019-12-31 13F MASIMO COM 574795100 387,791 6,651 1.75 61,294 8.08 0.0137
2019-11-13 2019-09-30 13F MASIMO COM 574795100 381,140 -6,827 -1.76 56,710 -1.78 0.0136
2019-08-13 2019-06-30 13F MASIMO COM 574795100 387,967 1,930 0.50 57,737 8.16 0.0137
2019-05-13 2019-03-31 13F MASIMO COM 574795100 386,037 10,199 2.71 53,382 32.28 0.0132
2019-02-12 2018-12-31 13F MASIMO COM 574795100 375,838 2,444 0.65 40,354 -13.22 0.0113
2018-11-14 2018-09-30 13F MASIMO COM 574795100 373,394 -2,529 -0.67 46,502 26.67 0.0114
2018-09-18 2018-06-30 13F/A-1 MASIMO COM 574795100 375,923 -354,455 -48.53 36,710 -42.85 0.0093
2018-08-14 2018-06-30 13F MASIMO COM 574795100 379,244 -351,134 37,034
2018-05-09 2018-03-31 13F MASIMO COM 574795100 730,378 -4,577 -0.62 64,238 3.07 0.0167
2018-02-14 2017-12-31 13F MASIMO COM 574795100 734,955 -29,660 -3.88 62,325 -5.83 0.0158
2017-11-13 2017-09-30 13F MASIMO COM 574795100 764,615 -4,152 -0.54 66,185 -5.58 0.0172
2017-08-11 2017-06-30 13F MASIMO COM 574795100 768,767 51,945 7.25 70,097 4.86 0.0196
2017-05-12 2017-03-31 13F MASIMO COM 574795100 716,822 162,053 29.21 66,849 78.78 0.0193
2017-02-13 2016-12-31 13F MASIMO COM 574795100 554,769 9,757 1.79 37,391 15.32 0.0115
2016-11-09 2016-09-30 13F MASIMO COM 574795100 545,012 2,782 0.51 32,423 13.86 0.0101
2016-08-12 2016-06-30 13F MASIMO COM 574795100 542,230 -24,033 -4.24 28,475 20.39 0.0092
2016-08-19 2016-03-31 13F/A-1 MASIMO COM 574795100 566,263 2,724 0.48 23,652 1.11 0.0078
2016-05-13 2016-03-31 13F Masimo COMM 574795100 566,263 23,693
2016-02-12 2015-12-31 13F Masimo COMM 574795100 563,539 13,328 2.42 23,393 10.26 0.0078
2015-11-12 2015-09-30 13F Masimo COMM 574795100 550,211 550,211 0.00 21,217 0.0071
2015-08-13 2015-06-30 13F Masimo COMM 574795100 0 -568,559 -100.00 0 -100.00
2015-05-14 2015-03-31 13F Masimo COMM 574795100 568,559 5,683 1.01 18,751 26.48 0.0056
2015-02-12 2014-12-31 13F Masimo COM 574795100 562,876 -59,334 -9.54 14,825 11.96 0.0045
2014-11-13 2014-09-30 13F Masimo COMM 574795100 622,210 -31,531 -4.82 13,241 -14.18 0.0042
2014-08-14 2014-06-30 13F MASIMO com 574795100 653,741 -234,881 -26.43 15,429 -36.43 0.0048
2014-05-14 2014-03-31 13F MASIMO COMM 574795100 888,622 -35,012 -3.79 24,269 -10.11 0.0076
2014-02-21 2013-12-31 13F/A-1 MASIMO COM 574795100 923,634 13,948 1.53 26,998 11.41 0.0087
2014-02-12 2013-12-31 13F MASIMO COM 574795100 923,634 26,998
2013-11-13 2013-09-30 13F MASIMO COM 574795100 909,686 -33,300 -3.53 24,234 21.23 0.0085
2013-08-09 2013-06-30 13F MASIMO COM 574795100 942,986 942,986 19,990 0.0072
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.