Masimo Corporation
MX ˙ BMV ˙ US5747951003
SecurityMX:MASI / Masimo Corporation
InstitutionAmeriprise Financial Inc
Latest Disclosed Ownership65,203 shares
Latest Disclosed Value $ 11,597,658
Ameriprise Financial Inc reports 86.08% decrease in ownership of MASI / Masimo Corporation

On May 15, 2026 - Ameriprise Financial Inc filed a 13F-HR form disclosing ownership of 65,203 shares of Masimo Corporation (MX:MASI) valued at $11,597,658 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 468,407 shares of Masimo Corporation. This represents a change in shares of -86.08% 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)
2026-05-15 2026-03-31 13F MASIMO COM 574795100 65,203 -403,204 -86.08 11,598 -80.96 0.0005
2026-02-17 2025-12-31 13F MASIMO COM 574795100 468,407 7,456 1.62 60,921 -10.43 0.0138
2025-11-14 2025-09-30 13F MASIMO COM 574795100 460,951 66,464 16.85 68,013 2.49 0.0156
2025-08-14 2025-06-30 13F MASIMO COM 574795100 394,487 182,701 86.27 66,361 88.08 0.0164
2025-05-14 2025-03-31 13F MASIMO COM 574795100 211,786 -4,160 -1.93 35,284 -1.15 0.0095
2025-02-14 2024-12-31 13F MASIMO COM 574795100 215,946 16,085 8.05 35,696 33.96 0.0092
2024-11-14 2024-09-30 13F MASIMO COM 574795100 199,861 108,073 117.74 26,647 130.53 0.0068
2024-08-14 2024-06-30 13F MASIMO COM 574795100 91,788 12,907 16.36 11,560 -0.21 0.0031
2024-05-15 2024-03-31 13F MASIMO COM 574795100 78,881 -3,914 -4.73 11,584 19.36 0.0032
2024-02-14 2023-12-31 13F MASIMO COM 574795100 82,795 8,741 11.80 9,704 49.45 0.0029
2023-11-14 2023-09-30 13F MASIMO COM 574795100 74,054 -30,936 -29.47 6,493 -62.41 0.0021
2023-08-14 2023-06-30 13F MASIMO COM 574795100 104,990 21,279 25.42 17,276 11.83 0.0054
2023-05-22 2023-03-31 13F/A-1 MASIMO COM 574795100 83,711 13,041 18.45 15,448 47.76 0.0051
2023-05-15 2023-03-31 13F MASCO COM 574795100 83,711 13,041 15,448 0.0009
2023-02-14 2022-12-31 13F MASIMO COM 574795100 70,670 -51,131 -41.98 10,455 -39.19 0.0036
2022-11-14 2022-09-30 13F MASIMO COM 574795100 121,801 -9,835 -7.47 17,193 -0.09 0.0064
2022-08-15 2022-06-30 13F MASIMO COM 574795100 131,636 54,934 71.62 17,208 54.35 0.0060
2022-05-16 2022-03-31 13F MASIMO COM 574795100 76,702 -323,623 -80.84 11,149 -90.48 0.0033
2022-02-14 2021-12-31 13F MASIMO COM 574795100 400,325 -231,680 -36.66 117,172 -31.50 0.0324
2021-11-15 2021-09-30 13F MASIMO COM 574795100 632,005 -28,625 -4.33 171,061 6.80 0.0547
2021-08-16 2021-06-30 13F MASIMO COM 574795100 660,630 83,547 14.48 160,167 20.82 0.0495
2021-05-17 2021-03-31 13F MASIMO COM 574795100 577,083 -92,304 -13.79 132,565 -26.21 0.0441
2021-02-12 2020-12-31 13F MASIMO COM 574795100 669,387 -3,311 -0.49 179,652 13.14 0.0637
2020-11-16 2020-09-30 13F MASIMO COM 574795100 672,698 -42,608 -5.96 158,794 -2.63 0.0646
2020-08-14 2020-06-30 13F MASIMO COM 574795100 715,306 -188,636 -20.87 163,084 1.86 0.0699
2020-05-15 2020-03-31 13F MASIMO COM 574795100 903,942 191,583 26.89 160,103 42.24 0.0840
2020-02-14 2019-12-31 13F MASIMO COM 574795100 712,359 6,183 0.88 112,555 7.12 0.0468
2019-11-14 2019-09-30 13F MASIMO COM 574795100 706,176 -41,658 -5.57 105,069 -5.59 0.0471
2019-08-14 2019-06-30 13F MASIMO COM 574795100 747,834 -69,332 -8.48 111,289 -1.51 0.0498
2019-05-15 2019-03-31 13F MASIMO COM 574795100 817,166 -82,195 -9.14 112,998 17.02 0.0520
2019-02-14 2018-12-31 13F MASIMO COM 574795100 899,361 -267,289 -22.91 96,565 -33.54 0.0483
2018-11-14 2018-09-30 13F MASIMO COM 574795100 1,166,650 -311,564 -21.08 145,295 0.64 0.0508
2018-08-14 2018-06-30 13F MASIMO COM 574795100 1,478,214 -187,566 -11.26 144,378 -1.45 0.0639
2018-05-14 2018-03-31 13F MASIMO COM 574795100 1,665,780 1,392,917 510.48 146,508 533.14 0.0663
2018-02-12 2017-12-31 13F MASIMO COM 574795100 272,863 4,510 1.68 23,140 -0.38 0.0106
2017-11-07 2017-09-30 13F MASIMO COM 574795100 268,353 1,930 0.72 23,228 -4.38 0.0111
2017-08-10 2017-06-30 13F MASIMO COM 574795100 266,423 14,553 5.78 24,293 3.41 0.0122
2017-05-05 2017-03-31 13F MASIMO COM 574795100 251,870 -171,964 -40.57 23,491 -17.76 0.0122
2017-02-03 2016-12-31 13F MASIMO COM 574795100 423,834 72,526 20.64 28,565 36.67 0.0156
2016-11-08 2016-09-30 13F MASIMO COM 574795100 351,308 7,244 2.11 20,900 15.67 0.0117
2016-08-08 2016-06-30 13F MASIMO COM 574795100 344,064 -8,808 -2.50 18,068 22.36 0.0106
2016-05-12 2016-03-31 13F MASIMO COM 574795100 352,872 -27,467 -7.22 14,766 -6.47 0.0088
2016-02-11 2015-12-31 13F MASIMO COM 574795100 380,339 -46,832 -10.96 15,788 -4.15 0.0093
2015-11-12 2015-09-30 13F MASIMO COM 574795100 427,171 -37,032 -7.98 16,472 -8.40 0.0102
2015-08-13 2015-06-30 13F MASIMO COM 574795100 464,203 -70,509 -13.19 17,983 1.97 0.0102
2015-05-14 2015-03-31 13F MASIMO COM 574795100 534,712 -42,307 -7.33 17,635 16.03 0.0101
2015-02-13 2014-12-31 13F MASIMO COM 574795100 577,019 -114,641 -16.57 15,199 3.27 0.0089
2014-11-14 2014-09-30 13F MASIMO COM 574795100 691,660 44,361 6.85 14,718 -3.65 0.0089
2014-08-13 2014-06-30 13F MASIMO COM 574795100 647,299 302,254 87.60 15,276 62.10 0.0090
2014-05-14 2014-03-31 13F MASIMO COM 574795100 345,045 226,655 191.45 9,424 172.37 0.0057
2014-02-14 2013-12-31 13F MASIMO COM 574795100 118,390 -1,045 -0.87 3,460 8.70 0.0021
2013-11-14 2013-09-30 13F MASIMO COM 574795100 119,435 8,464 7.63 3,183 35.39 0.0021
2013-08-14 2013-06-30 13F MASIMO COM 574795100 110,971 110,971 2,351 0.0016
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.