Masimo Corporation
MX ˙ BMV ˙ US5747951003
SecurityMX:MASI / Masimo Corporation
InstitutionQuantinno Capital Management LP
Latest Disclosed Ownership22,501 shares
Latest Disclosed Value $ 4,002,253
Quantinno Capital Management LP reports 69.78% increase in ownership of MASI / Masimo Corporation

On May 15, 2026 - Quantinno Capital Management LP filed a 13F-HR form disclosing ownership of 22,501 shares of Masimo Corporation (MX:MASI) valued at $4,002,253 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 13,253 shares of Masimo Corporation. This represents a change in shares of 69.78% 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 22,501 9,248 69.78 4,002 132.27 0.0067
2026-02-17 2025-12-31 13F MASIMO COM 574795100 13,253 -26,336 -66.52 1,724 -70.50 0.0035
2025-11-14 2025-09-30 13F MASIMO COM 574795100 39,589 -80,794 -67.11 5,841 -71.16 0.0159
2025-08-14 2025-06-30 13F MASIMO COM 574795100 120,383 56,644 88.87 20,251 90.71 0.0875
2025-05-12 2025-03-31 13F MASIMO COM 574795100 63,739 59,749 1,497.47 10,619 1,511.23 0.0692
2025-02-14 2024-12-31 13F MASIMO COM 574795100 3,990 1,880 89.10 660 134.52 0.0065
2024-11-14 2024-09-30 13F MASIMO COM 574795100 2,110 -1,788 -45.87 281 -42.65 0.0037
2024-08-14 2024-06-30 13F MASIMO COM 574795100 3,898 238 6.50 491 -8.75 0.0088
2024-05-14 2024-03-31 13F MASIMO COM 574795100 3,660 3,660 537 0.0117
2023-11-14 2023-09-30 13F MASIMO COM 574795100 0 -1,382 -100.00 0 -100.00
2023-08-04 2023-06-30 13F MASIMO COM 574795100 1,382 -6,581 -82.64 227 -84.55 0.0130
2023-05-03 2023-03-31 13F MASIMO COM 1/1 574795100 7,963 5,244 192.87 1,469 265.42 0.0971
2023-02-13 2022-12-31 13F MASIMO COM 574795100 2,719 74 2.80 402 7.77 0.0300
2022-11-08 2022-09-30 13F MASIMO COM 574795100 2,645 6 0.23 373 8.12 0.0480
2022-08-15 2022-06-30 13F MASIMO COM 574795100 2,639 -329 -11.08 345 -20.14 0.0498
2022-05-12 2022-03-31 13F MASIMO COM 574795100 2,968 1,674 129.37 432 13.98 0.0659
2022-02-14 2021-12-31 13F MASIMO COM 574795100 1,294 -548 -29.75 379 -24.05 0.0686
2021-11-15 2021-09-30 13F MASIMO COM 574795100 1,842 0 0.00 499 11.63 0.5571
2021-08-16 2021-06-30 13F MASIMO COM 574795100 1,842 761 70.40 447 80.24 0.5068
2021-05-17 2021-03-31 13F MASIMO COM 574795100 1,081 -1,025 -48.67 248 -56.11 0.2703
2021-02-09 2020-12-31 13F MASIMO COM 574795100 2,106 -654 -23.70 565 -13.34 0.4368
2020-11-16 2020-09-30 13F MASIMO COM 574795100 2,760 1,778 181.06 652 191.07 0.4361
2020-08-14 2020-06-30 13F MASIMO COM 574795100 982 -1,502 -60.47 224 -49.09 0.2209
2020-05-15 2020-03-31 13F MASIMO COM 574795100 2,484 0 0.00 440 11.96 0.2748
2020-02-14 2019-12-31 13F MASIMO COM 574795100 2,484 -761 -23.45 393 -18.63 0.2473
2019-11-14 2019-09-30 13F MASIMO COM 574795100 3,245 0 0.00 483 0.00 0.3253
2019-08-14 2019-06-30 13F MASIMO COM 574795100 3,245 0 0.00 483 7.57 0.2835
2019-05-14 2019-03-31 13F MASIMO COM 574795100 3,245 0 0.00 449 29.02 0.2876
2019-02-14 2018-12-31 13F MASIMO COM 574795100 3,245 3,245 348 0.2834
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.