Masimo Corporation
MX ˙ BMV ˙ US5747951003
SecurityMX:MASI / Masimo Corporation
InstitutionState Street Corp
Latest Disclosed Ownership1,437,724 shares
Latest Disclosed Value $ 255,727,968
State Street Corp reports 1.59% increase in ownership of MASI / Masimo Corporation

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 1,437,724 shares of Masimo Corporation (MX:MASI) valued at $255,727,968 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,415,196 shares of Masimo Corporation. This represents a change in shares of 1.59% 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 1,437,724 22,528 1.59 255,728 38.94 0.0088
2026-02-13 2025-12-31 13F MASIMO COM 574795100 1,415,196 -69,275 -4.67 184,060 -15.97 0.0062
2025-11-14 2025-09-30 13F MASIMO COM 574795100 1,484,471 -1,923 -0.13 219,034 -12.40 0.0076
2025-08-14 2025-06-30 13F MASIMO COM 574795100 1,486,394 10,403 0.70 250,041 1.68 0.0094
2025-05-15 2025-03-31 13F MASIMO COM 574795100 1,475,991 12,525 0.86 245,900 1.65 0.0101
2025-02-14 2024-12-31 13F MASIMO COM 574795100 1,463,466 24,652 1.71 241,911 26.10 0.0095
2024-11-14 2024-09-30 13F MASIMO COM 574795100 1,438,814 10,179 0.71 191,837 6.62 0.0078
2024-08-14 2024-06-30 13F MASIMO COM 574795100 1,428,635 68,313 5.02 179,922 -9.93 0.0079
2024-05-15 2024-03-31 13F MASIMO COM 574795100 1,360,322 2,920 0.22 199,763 25.56 0.0089
2024-02-14 2023-12-31 13F MASIMO COM 574795100 1,357,402 -45,806 -3.26 159,101 29.32 0.0077
2023-11-14 2023-09-30 13F MASIMO COM 574795100 1,403,208 -261,578 -15.71 123,033 -55.09 0.0068
2023-08-14 2023-06-30 13F MASIMO COM 574795100 1,664,786 -46,809 -2.73 273,941 -13.27 0.0144
2023-05-15 2023-03-31 13F MASIMO COM 574795100 1,711,595 12,836 0.76 315,858 25.67 0.0178
2023-05-15 2022-12-31 13F/A-99 MASIMO COM 574795100 1,698,759 41,611 2.51 251,331 7.44 0.0148
2023-05-15 2022-12-31 13F MASIMO COM 574795100 1,698,759 41,611 251,331 0.0148
2022-11-15 2022-09-30 13F MASIMO COM 574795100 1,657,148 -33,366 -1.97 233,923 5.90 0.0148
2022-08-15 2022-06-30 13F MASIMO COM 574795100 1,690,514 -40,477 -2.34 220,899 -12.32 0.0132
2022-05-16 2022-03-31 13F MASIMO COM 574795100 1,730,991 27,261 1.60 251,928 -49.50 0.0125
2022-02-14 2021-12-31 13F MASIMO COM 574795100 1,703,730 13,399 0.79 498,818 9.01 0.0237
2021-11-15 2021-09-30 13F MASIMO COM 574795100 1,690,331 -8,349 -0.49 457,590 11.11 0.0242
2021-08-16 2021-06-30 13F MASIMO COM 574795100 1,698,680 69,274 4.25 411,845 10.06 0.0217
2021-07-09 2021-03-31 13F/A-1 MASIMO COM 574795100 1,629,406 -37,643 -2.26 374,209 -16.36 0.0215
2021-05-17 2021-03-31 13F MASIMO COM 574795100 1,629,406 -37,643 374,209 0.0215
2021-02-16 2020-12-31 13F MASIMO COM 574795100 1,667,049 21,964 1.34 447,403 15.21 0.0274
2020-11-10 2020-09-30 13F MASIMO COM 574795100 1,645,085 -9,994 -0.60 388,339 2.91 0.0265
2020-08-14 2020-06-30 13F MASIMO COM 574795100 1,655,079 421,454 34.16 377,341 72.70 0.0274
2020-06-19 2020-03-31 13F/A-1 MASIMO COM 574795100 1,233,625 41,833 3.51 218,500 15.99 0.0191
2020-05-11 2020-03-31 13F MASIMO COM 574795100 1,233,625 41,833 218,500 19,188.6996
2020-02-06 2019-12-31 13F MASIMO COM 574795100 1,191,792 -16,758 -1.39 188,375 4.76 0.0129
2019-11-14 2019-09-30 13F MASIMO COM 574795100 1,208,550 -44,581 -3.56 179,820 -3.58 0.0134
2019-08-14 2019-06-30 13F MASIMO COM 574795100 1,253,131 5,101 0.41 186,491 8.06 0.0139
2019-05-15 2019-03-31 13F MASIMO COM 574795100 1,248,030 49,402 4.12 172,578 34.10 0.0135
2019-02-12 2018-12-31 13F MASIMO COM 574795100 1,198,628 -90,688 -7.03 128,697 -19.85 0.0117
2018-11-09 2018-09-30 13F MASIMO Common equity shares 574795100 1,289,316 36,983 2.95 160,569 31.30 0.0123
2018-08-14 2018-06-30 13F MASIMO Common equity shares 574795100 1,252,333 -328,718 -20.79 122,292 -12.06 0.0102
2018-05-15 2018-03-31 13F MASIMO Common equity shares 574795100 1,581,051 -64,212 -3.90 139,056 -0.33 0.0118
2018-02-14 2017-12-31 13F MASIMO Common equity shares 574795100 1,645,263 53,523 3.36 139,516 1.26 0.0112
2017-11-14 2017-09-30 13F MASIMO Common equity shares 574795100 1,591,740 44,012 2.84 137,781 -2.37 0.0119
2017-08-14 2017-06-30 13F MASIMO Common equity shares 574795100 1,547,728 146,212 10.43 141,121 7.97 0.0125
2017-05-15 2017-03-31 13F MASIMO Common equity shares 574795100 1,401,516 419,767 42.76 130,704 97.53 0.0117
2017-02-09 2016-12-31 13F MASIMO Common equity shares 574795100 981,749 35,945 3.80 66,169 17.60 0.0062
2017-01-13 2016-09-30 13F/A-1 MASIMO Common equity shares 574795100 945,804 76,202 8.76 56,264 23.20 0.0057
2016-11-14 2016-09-30 13F MASIMO Common equity shares 574795100 945,804 56,264
2016-08-12 2016-06-30 13F MASIMO Common equity shares 574795100 869,602 -21,335 -2.39 45,667 22.53 0.0049
2016-05-20 2016-03-31 13F/A-1 MASIMO Common equity shares 574795100 890,937 26,485 3.06 37,271 3.86 0.0040
2016-05-12 2016-03-31 13F MASIMO Common equity shares 574795100 890,937 37,271
2016-02-16 2015-12-31 13F MASIMO Common equity shares 574795100 864,452 19,856 2.35 35,885 10.19 0.0039
2015-11-16 2015-09-30 13F MASIMO Common equity shares 574795100 844,596 -16,405 -1.91 32,565 -2.37 0.0038
2015-08-13 2015-06-30 13F MASIMO Common equity shares 574795100 861,001 -24,872 -2.81 33,355 14.19 0.0036
2015-05-15 2015-03-31 13F MASIMO Common equity shares 574795100 885,873 10,401 1.19 29,211 26.68 0.0030
2015-02-11 2014-12-31 13F MASIMO Common equity shares 574795100 875,472 -71,292 -7.53 23,059 14.45 0.0023
2014-11-12 2014-09-30 13F/A-1 MASIMO Common equity shares 574795100 946,764 -36,317 -3.69 20,148 -13.15 0.0022
2014-11-10 2014-09-30 13F MASIMO Common equity shares 574795100 946,764 20,148
2014-08-12 2014-06-30 13F MASIMO Common equity shares 574795100 983,081 -611,726 -38.36 23,199 -46.74 0.0025
2014-05-15 2014-03-31 13F/A-1 MASIMO Common equity shares 574795100 1,594,807 5,737 0.36 43,557 -6.22 0.0049
2014-05-13 2014-03-31 13F MASIMO Common equity shares 574795100 1,596,193 43,595
2014-02-06 2013-12-31 13F/A-1 MASIMO Common equity shares 574795100 1,589,070 -27,789 -1.72 46,446 7.83 0.0052
2014-02-06 2013-12-31 13F MASIMO Common equity shares 574795100 1,822,290 38,284
2013-11-12 2013-09-30 13F MASIMO Common Stock 574795100 1,616,859 -38,009 -2.30 43,075 22.79 0.0053
2013-08-08 2013-06-30 13F MASIMO Common Stock 574795100 1,654,868 1,654,868 35,081 0.0046
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.