Masimo Corporation
US ˙ NasdaqGS ˙ US5747951003

SecurityMASI / Masimo Corporation
InstitutionBellevue Group AG
Latest Disclosed Ownership8,753 shares
Latest Disclosed Value $ 1,556,896
Bellevue Group AG reports 91.00% decrease in ownership of MASI / Masimo Corporation

On May 14, 2026 - Bellevue Group AG filed a 13F-HR form disclosing ownership of 8,753 shares of Masimo Corporation (US:MASI) valued at $1,556,896 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 97,285 shares of Masimo Corporation. This represents a change in shares of -91.00% during the quarter. The current value of the position is $1,564,861 USD.

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 8,753 -88,532 -91.00 1,557 -87.70 0.0368
2026-02-17 2025-12-31 13F MASIMO COM 574795100 97,285 317 0.33 12,653 -11.57 0.2398
2025-11-14 2025-09-30 13F MASIMO COM 574795100 96,968 7,295 8.14 14,308 -5.15 0.2973
2025-08-14 2025-06-30 13F MASIMO COM 574795100 89,673 19,865 28.46 15,085 29.70 0.3325
2025-05-14 2025-03-31 13F MASIMO COM 574795100 69,808 45,642 188.87 11,630 191.19 0.2606
2025-02-14 2024-12-31 13F MASIMO COM 574795100 24,166 24,166 3,995 0.0769
2022-05-13 2022-03-31 13F MASIMO COM 574795100 0 -131,376 -100.00 0 -100.00
2022-02-10 2021-12-31 13F MASIMO COM 574795100 131,376 3,663 2.87 38,464 11.25 0.3965
2021-11-12 2021-09-30 13F MASIMO COM 574795100 127,713 0 0.00 34,573 11.66 0.3509
2021-08-12 2021-06-30 13F MASIMO COM 574795100 127,713 1,517 1.20 30,964 6.84 0.3023
2021-05-12 2021-03-31 13F MASIMO COM 574795100 126,196 18,372 17.04 28,982 0.15 0.3066
2021-02-16 2020-12-31 13F MASIMO COM 574795100 107,824 5,671 5.55 28,938 20.00 0.3314
2020-11-16 2020-09-30 13F MASIMO COM 574795100 102,153 4,612 4.73 24,114 8.44 0.3332
2020-08-13 2020-06-30 13F MASIMO COM 574795100 97,541 5,296 5.74 22,238 36.11 0.3147
2020-05-14 2020-03-31 13F MASIMO COM 574795100 92,245 13,196 16.69 16,338 30.77 0.3168
2020-02-14 2019-12-31 13F MASIMO COM 574795100 79,049 10,657 15.58 12,494 22.78 0.1981
2019-11-14 2019-09-30 13F MASIMO COM 574795100 68,392 2,800 4.27 10,176 4.25 0.1893
2019-08-14 2019-06-30 13F MASIMO COM 574795100 65,592 42,812 187.94 9,761 209.87 0.1667
2019-05-15 2019-03-31 13F MASIMO COM 574795100 22,780 0 0.00 3,150 28.78 0.1733
2019-02-12 2018-12-31 13F MASIMO COM 574795100 22,780 3,304 16.96 2,446 0.82 0.1608
2018-11-13 2018-09-30 13F MASIMO COM 574795100 19,476 4,676 31.59 2,426 67.89 0.1539
2018-08-07 2018-06-30 13F MASIMO COM 574795100 14,800 -2,200 -12.94 1,445 -3.34 0.1232
2018-05-09 2018-03-31 13F MASIMO COM 574795100 17,000 0 0.00 1,495 3.68 0.1481
2018-02-14 2017-12-31 13F MASIMO COM 574795100 17,000 0 0.00 1,442 -2.04 0.1506
2017-11-13 2017-09-30 13F MASIMO COM 574795100 17,000 0 0.00 1,472 -5.03 0.1540
2017-08-14 2017-06-30 13F MASIMO COM 574795100 17,000 -6,000 -26.09 1,550 -27.74 0.1833
2017-05-11 2017-03-31 13F MASIMO COM 574795100 23,000 -7,000 -23.33 2,145 6.08 0.2858
2017-02-10 2016-12-31 13F MASIMO COM 574795100 30,000 -40,000 -57.14 2,022 -51.44 0.4141
2016-11-10 2016-09-30 13F Masimo COM 574795100 70,000 -5,000 -6.67 4,164 5.71 0.7523
2016-08-12 2016-06-30 13F Masimo COM 574795100 75,000 0 0.00 3,939 25.53 0.7412
2016-05-16 2016-03-31 13F Masimo COM 574795100 75,000 75,000 3,138 0.5694
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.