Masimo Corporation
US ˙ NasdaqGS ˙ US5747951003

SecurityMASI / Masimo Corporation
InstitutionKBC Group NV
Latest Disclosed Ownership1,258 shares
Latest Disclosed Value $ 224
KBC Group NV ownership in MASI / Masimo Corporation

On May 7, 2026 - KBC Group NV filed a 13F-HR form disclosing ownership of 1,258 shares of Masimo Corporation (US:MASI) valued at $223,760 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 1,258 shares of Masimo Corporation. The current value of the position is $224,905 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)
2026-05-07 2026-03-31 13F MASIMO COM 574795100 1,258 0 0.00 0 0.0006
2026-01-26 2025-12-31 13F MASIMO COM 574795100 1,258 0 0.00 0 0.0004
2026-01-20 2025-09-30 13F MASIMO COM 574795100 1,258 0 0.00 0 0.0004
2025-08-08 2025-06-30 13F MASIMO COM 574795100 1,258 -847 -40.24 0 0.0006
2025-04-25 2025-03-31 13F MASIMO COM 574795100 2,105 -17,017 -88.99 0 -100.00 0.0011
2025-01-22 2024-12-31 13F MASIMO COM 574795100 19,122 17,842 1,393.91 3 0.0087
2024-11-06 2024-09-30 13F MASIMO COM 574795100 1,280 189 17.32 0 0.0005
2024-07-17 2024-06-30 13F MASIMO COM 574795100 1,091 -817 -42.82 0 0.0004
2024-05-08 2024-03-31 13F MASIMO COM 574795100 1,908 -1,182 -38.25 0 0.0009
2024-02-13 2023-12-31 13F MASIMO COM 574795100 3,090 -7,312 -70.29 0 -100.00 0.0013
2024-02-15 2023-09-30 13F/A-1 MASIMO COM 574795100 10,402 -1,846 -15.07 1 -100.00 0.0037
2023-11-22 2023-09-30 13F MASIMO COM 574795100 11,353 0 2 0.0078
2024-02-15 2023-06-30 13F/A-1 MASIMO COM 574795100 12,248 -4,997 -28.98 2 -33.33 0.0083
2023-07-28 2023-06-30 13F MASIMO COM 574795100 11,353 -5,796 2 0.0078
2024-02-14 2023-03-31 13F/A-1 MASIMO COM 574795100 17,245 14,211 468.39 3 0.0135
2023-05-04 2023-03-31 13F MASIMO COM 574795100 17,149 16,332 3 0.0149
2024-02-14 2022-12-31 13F/A-1 MASIMO COM 574795100 3,034 2,121 232.31 0 0.0022
2023-02-13 2022-12-31 13F MASIMO COM 574795100 817 -96 0 0.0000
2024-02-15 2022-09-30 13F/A-1 MASIMO COM 574795100 913 -1,498 -62.13 0 0.0007
2022-11-08 2022-09-30 13F MASIMO COM 574795100 817 -1,594 115 0.0006
2024-02-14 2022-06-30 13F/A-1 MASIMO COM 574795100 2,411 351 17.04 0 -100.00 0.0016
2022-07-26 2022-06-30 13F MASIMO COM 574795100 2,292 232 299 0.0015
2024-02-14 2022-03-31 13F/A-1 MASIMO COM 574795100 2,060 0 0.00 0 0.0012
2022-05-06 2022-03-31 13F MASIMO COM 574795100 2,060 0 300 0.0011
2024-02-14 2021-12-31 13F/A-1 MASIMO COM 574795100 2,060 -17,393 -89.41 1 -100.00 0.0020
2022-02-03 2021-12-31 13F MASIMO COM 574795100 2,060 -17,393 603 0.0019
2021-11-10 2021-09-30 13F MASIMO COM 574795100 19,453 -3,355 -14.71 5,266 -4.77 0.0193
2022-02-15 2021-06-30 13F/A-1 MASIMO COM 574795100 22,808 3,660 19.11 5,530 25.77 0.0199
2021-08-11 2021-06-30 13F MASIMO COM 574795100 22,808 3,660 5,530 0.0199
2022-02-14 2021-03-31 13F/A-1 MASIMO COM 574795100 19,148 7,424 63.32 4,397 -86.03 0.0178
2021-04-26 2021-03-31 13F MASIMO COM 574795100 19,148 7,424 4,397 0.0178
2022-02-14 2020-12-31 13F/A-1 MASIMO COM 574795100 11,724 5,065 76.06 31,465 1,901.59 0.0148
2021-02-10 2020-12-31 13F MASIMO COM 574795100 11,724 5,065 3,146 0.0145
2022-02-14 2020-09-30 13F/A-1 MASIMO COM 574795100 6,659 2,895 76.91 1,572 83.22 0.0093
2020-10-28 2020-09-30 13F MASIMO COM 574795100 6,659 2,895 1,572 0.0093
2022-02-14 2020-06-30 13F/A-1 MASIMO COM 574795100 3,764 3,764 858 0.0057
2020-08-10 2020-06-30 13F MASIMO COM 574795100 3,764 3,764 858 0.0057
2017-05-10 2017-03-31 13F MASIMO COM 574795100 0 -16,634 -100.00 0 -100.00
2017-02-16 2016-12-31 13F MASIMO COM 574795100 16,634 -227 -1.35 1,121 11.76 0.0111
2016-11-03 2016-09-30 13F MASIMO COM 574795100 16,861 3,161 23.07 1,003 39.50 0.0118
2016-08-03 2016-06-30 13F MASIMO COM 574795100 13,700 4,372 46.87 719 84.36 0.0103
2016-05-11 2016-03-31 13F MASIMO COM 574795100 9,328 0 0.00 390 0.78 0.0065
2016-02-11 2015-12-31 13F MASIMO COM 574795100 9,328 -765 -7.58 387 -0.51 0.0071
2015-11-12 2015-09-30 13F MASIMO COM 574795100 10,093 8,342 476.41 389 472.06 0.0078
2015-12-16 2015-06-30 13F/A-1 MASIMO COM 574795100 1,751 0 0.00 68 17.24 0.0009
2015-07-31 2015-06-30 13F MASIMO COM 574795100 1,751 68
2015-12-16 2015-03-31 13F/A-1 MASIMO COM 574795100 1,751 0 0.00 58 26.09 0.0007
2015-04-30 2015-03-31 13F MASIMO COM 574795100 1,751 58
2015-12-15 2014-12-31 13F/A-1 MASIMO COM 574795100 1,751 0 0.00 46 24.32 0.0005
2015-02-12 2014-12-31 13F MASIMO COM 574795100 1,751 46
2014-10-16 2014-09-30 13F MASIMO COM 574795100 1,751 0 0.00 37 -9.76 0.0013
2014-08-01 2014-06-30 13F MASIMO COM 574795100 1,751 0 0.00 41 -14.58 0.0005
2014-04-30 2014-03-31 13F MASIMO COM 574795100 1,751 0 0.00 48 -5.88 0.0008
2014-01-21 2013-12-31 13F MASIMO COM 574795100 1,751 0 0.00 51 8.51 0.0008
2013-11-06 2013-09-30 13F MASIMO COM 574795100 1,751 643 58.03 47 104.35 0.0008
2013-07-29 2013-06-30 13F MASIMO COM 574795100 1,108 1,108 23 0.0004
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.