Masimo Corporation
MX ˙ BMV ˙ US5747951003
SecurityMX:MASI / Masimo Corporation
InstitutionGuggenheim Capital Llc
Latest Disclosed Ownership1,407 shares
Latest Disclosed Value $ 250,263
Guggenheim Capital Llc ownership in MASI / Masimo Corporation

On May 15, 2026 - Guggenheim Capital Llc filed a 13F-HR form disclosing ownership of 1,407 shares of Masimo Corporation (MX:MASI) valued at $250,263 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 0 shares of Masimo Corporation.

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 1,407 1,407 250 0.0010
2026-02-17 2025-12-31 13F MASIMO COM 574795100 0 -5,276 -100.00 0 -100.00
2025-11-13 2025-09-30 13F MASIMO COM 574795100 5,276 -397 -7.00 778 -18.45 0.0056
2025-08-13 2025-06-30 13F MASIMO COM 574795100 5,673 -683 -10.75 954 -9.83 0.0076
2025-05-14 2025-03-31 13F MASIMO COM 574795100 6,356 -665 -9.47 1,059 -8.79 0.0097
2025-02-13 2024-12-31 13F MASIMO COM 574795100 7,021 2,674 61.51 1,161 100.35 0.0094
2024-11-13 2024-09-30 13F MASIMO COM 574795100 4,347 -152 -3.38 580 2.30 0.0041
2024-08-14 2024-06-30 13F MASIMO COM 574795100 4,499 -230 -4.86 567 -18.44 0.0040
2024-05-14 2024-03-31 13F MASIMO COM 574795100 4,729 659 16.19 694 45.49 0.0049
2024-02-14 2023-12-31 13F MASIMO COM 574795100 4,070 -200 -4.68 477 27.54 0.0036
2023-11-14 2023-09-30 13F MASIMO COM 574795100 4,270 278 6.96 374 -42.99 0.0032
2023-08-11 2023-06-30 13F MASIMO COM 574795100 3,992 -779 -16.33 657 -25.45 0.0052
2023-05-11 2023-03-31 13F MASIMO COM 574795100 4,771 -1,616 -25.30 880 -6.78 0.0074
2023-02-14 2022-12-31 13F MASIMO COM 574795100 6,387 -2,591 -28.86 945 -25.55 0.0083
2022-11-14 2022-09-30 13F MASIMO COM 574795100 8,978 157 1.78 1,268 9.97 0.0116
2022-08-15 2022-06-30 13F MASIMO COM 574795100 8,821 -397 -4.31 1,153 -14.08 0.0091
2022-05-16 2022-03-31 13F MASIMO COM 574795100 9,218 1,437 18.47 1,342 -41.09 0.0081
2022-02-14 2021-12-31 13F MASIMO COM 574795100 7,781 -2,814 -26.56 2,278 -20.57 0.0119
2021-11-15 2021-09-30 13F MASIMO COM 574795100 10,595 716 7.25 2,868 19.70 0.0172
2021-08-13 2021-06-30 13F MASIMO COM 574795100 9,879 -1,062 -9.71 2,396 -4.62 0.0141
2021-05-13 2021-03-31 13F MASIMO COM 574795100 10,941 1,220 12.55 2,512 -3.72 0.0165
2021-02-16 2020-12-31 13F MASIMO COM 574795100 9,721 -3,627 -27.17 2,609 -17.20 0.0164
2020-11-13 2020-09-30 13F MASIMO COM 574795100 13,348 -9,991 -42.81 3,151 -40.79 0.0228
2020-08-14 2020-06-30 13F MASIMO COM 574795100 23,339 14,027 150.63 5,322 222.74 0.0412
2020-06-02 2020-03-31 13F MASIMO COM 574795100 9,312 -3,502 -27.33 1,649 -18.57 0.0166
2020-02-20 2019-12-31 13F/A-1 MASIMO COM 574795100 12,814 2,832 28.37 2,025 36.36 0.0152
2020-02-14 2019-12-31 13F MASIMO COM 574795100 12,814 2,832 2,025 12,001.7702
2020-02-20 2019-09-30 13F/A-1 MASIMO COM 574795100 9,982 -1,262 -11.22 1,485 -11.24 0.0119
2019-11-14 2019-09-30 13F MASIMO COM 574795100 9,982 -1,262 1,485 10,882.5156
2019-08-14 2019-06-30 13F MASIMO COM 574795100 11,244 -4,491 -28.54 1,673 -23.12 0.0136
2019-05-15 2019-03-31 13F MASIMO COM 574795100 15,735 2,076 15.20 2,176 48.33 0.0177
2019-02-14 2018-12-31 13F MASIMO COM 574795100 13,659 -10,314 -43.02 1,467 -50.87 0.0124
2018-11-14 2018-09-30 13F MASIMO COM 574795100 23,973 -1,657 -6.47 2,986 19.30 0.0195
2018-08-14 2018-06-30 13F MASIMO COM 574795100 25,630 -88,613 -77.57 2,503 -75.09 0.0167
2018-05-15 2018-03-31 13F MASIMO COM 574795100 114,243 -3,674 -3.12 10,048 0.48 0.0245
2018-02-14 2017-12-31 13F MASIMO COM 574795100 117,917 -10,429 -8.13 10,000 -9.99 0.0237
2017-11-14 2017-09-30 13F MASIMO COM 574795100 128,346 12,597 10.88 11,110 5.28 0.0261
2017-08-14 2017-06-30 13F MASIMO COM 574795100 115,749 1,780 1.56 10,553 -0.70 0.0280
2017-05-15 2017-03-31 13F MASIMO COM 574795100 113,969 78,216 218.77 10,627 341.14 0.0288
2017-02-14 2016-12-31 13F MASIMO COM 574795100 35,753 -4,902 -12.06 2,409 -0.41 0.0069
2016-11-14 2016-09-30 13F MASIMO COM 574795100 40,655 -5,248 -11.43 2,419 0.33 0.0075
2016-08-15 2016-06-30 13F MASIMO COM 574795100 45,903 -2,496 -5.16 2,411 19.06 0.0076
2016-05-16 2016-03-31 13F MASIMO COM 574795100 48,399 -49,216 -50.42 2,025 -50.02 0.0064
2016-02-16 2015-12-31 13F MASIMO COM 574795100 97,615 57,927 145.96 4,052 164.66 0.0118
2015-11-16 2015-09-30 13F MASIMO COM 574795100 39,688 -12,356 -23.74 1,531 -24.06 0.0047
2015-08-14 2015-06-30 13F MASIMO COM 574795100 52,044 52,044 2,016 0.0050
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.