Masimo Corporation
MX ˙ BMV ˙ US5747951003
SecurityMX:MASI / Masimo Corporation
InstitutionFifth Third Bancorp
Latest Disclosed Ownership11,736 shares
Latest Disclosed Value $ 2,087,572
Fifth Third Bancorp reports 1,933.97% increase in ownership of MASI / Masimo Corporation

On May 1, 2026 - Fifth Third Bancorp filed a 13F-HR form disclosing ownership of 11,736 shares of Masimo Corporation (MX:MASI) valued at $2,087,572 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 577 shares of Masimo Corporation. This represents a change in shares of 1,933.97% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-01 2026-03-31 13F MASIMO COM 574795100 11,736 11,159 1,933.97 2,088 2,682.67 0.0038
2026-02-02 2025-12-31 13F MASIMO COM 574795100 577 1 0.17 75 -10.71 0.0002
2025-11-07 2025-09-30 13F MASIMO COM 574795100 576 -8 -1.37 85 -14.29 0.0003
2025-07-15 2025-06-30 13F MASIMO COM 574795100 584 -64 -9.88 98 -8.41 0.0003
2025-04-15 2025-03-31 13F MASIMO COM 574795100 648 38 6.23 108 7.00 0.0004
2025-01-21 2024-12-31 13F MASIMO COM 574795100 610 -113 -15.63 101 4.17 0.0004
2024-10-17 2024-09-30 13F MASIMO COM 574795100 723 28 4.03 96 10.34 0.0003
2024-07-22 2024-06-30 13F MASIMO COM 574795100 695 98 16.42 88 0.00 0.0003
2024-04-23 2024-03-31 13F MASIMO COM 574795100 597 7 1.19 88 26.09 0.0003
2024-01-19 2023-12-31 13F MASIMO COM 574795100 590 350 145.83 69 228.57 0.0003
2023-10-31 2023-09-30 13F MASIMO COM 574795100 240 -56 -18.92 21 -56.25 0.0001
2023-07-26 2023-06-30 13F MASIMO COM 574795100 296 44 17.46 49 4.35 0.0002
2023-04-24 2023-03-31 13F MASIMO COM 574795100 252 2 0.80 47 27.78 0.0002
2023-01-25 2022-12-31 13F MASIMO COM 574795100 250 -1 -0.40 37 2.86 0.0002
2022-10-25 2022-09-30 13F MASIMO COM 574795100 251 -6 -2.33 35 2.94 0.0002
2022-08-04 2022-06-30 13F MASIMO COM 574795100 257 -19 -6.88 34 -15.00 0.0002
2022-04-19 2022-03-31 13F MASIMO COM 574795100 276 58 26.61 40 -37.50 0.0002
2022-02-01 2021-12-31 13F MASIMO COM 574795100 218 82 60.29 64 72.97 0.0002
2021-10-15 2021-09-30 13F MASIMO COM 574795100 136 46 51.11 37 68.18 0.0002
2021-08-06 2021-06-30 13F MASIMO COM 574795100 90 -28 -23.73 22 -18.52 0.0001
2021-05-07 2021-03-31 13F MASIMO COM 574795100 118 42 55.26 27 35.00 0.0001
2021-02-16 2020-12-31 13F MASIMO COM 574795100 76 58 322.22 20 400.00 0.0001
2020-11-09 2020-09-30 13F MASIMO COM 574795100 18 12 200.00 4 300.00 0.0000
2020-08-05 2020-06-30 13F MASIMO COM 574795100 6 -303 -98.06 1 -98.18 0.0000
2020-05-05 2020-03-31 13F MASIMO COM 574795100 309 -25 -7.49 55 3.77 0.0004
2020-02-14 2019-12-31 13F MASIMO COM 574795100 334 -10 -2.91 53 3.92 0.0003
2019-11-14 2019-09-30 13F MASIMO COM 574795100 344 169 96.57 51 96.15 0.0003
2019-08-07 2019-06-30 13F MASIMO COM 574795100 175 16 10.06 26 18.18 0.0002
2019-05-14 2019-03-31 13F MASIMO COM 574795100 159 -24 -13.11 22 10.00 0.0001
2019-02-14 2018-12-31 13F MASIMO COM 574795100 183 24 15.09 20 0.00 0.0001
2018-11-14 2018-09-30 13F MASIMO COM 574795100 159 0 0.00 20 25.00 0.0001
2018-08-14 2018-06-30 13F MASIMO COM 574795100 159 -7,459 -97.91 16 -97.61 0.0001
2018-05-15 2018-03-31 13F MASIMO COM 574795100 7,618 1,384 22.20 670 26.65 0.0046
2018-02-14 2017-12-31 13F MASIMO COM 574795100 6,234 672 12.08 529 9.98 0.0036
2017-11-14 2017-09-30 13F MASIMO COM 574795100 5,562 -47 -0.84 481 -5.87 0.0034
2017-08-11 2017-06-30 13F MASIMO COM 574795100 5,609 -820 -12.75 511 -14.83 0.0038
2017-05-12 2017-03-31 13F MASIMO COM 574795100 6,429 -2,351 -26.78 600 1.35 0.0045
2017-02-13 2016-12-31 13F/A-1 MASIMO COM 574795100 8,780 -2,060 -19.00 592 -8.22 0.0048
2017-02-09 2016-12-31 13F MASIMO COM 574795100 10,840 0 645 0.0053
2016-11-10 2016-09-30 13F MASIMO COM 574795100 10,840 -1,878 -14.77 645 -3.44 0.0053
2016-08-11 2016-06-30 13F MASIMO COM 574795100 12,718 12,708 127,080.00 668 0.0057
2016-05-13 2016-03-31 13F MASIMO COM 574795100 10 -116 -92.06 0 -100.00
2016-02-16 2015-12-31 13F MASIMO COM 574795100 126 -68 -35.05 5 -28.57 0.0000
2015-11-13 2015-09-30 13F MASIMO COM 574795100 194 108 125.58 7 133.33 0.0001
2015-08-14 2015-06-30 13F MASIMO COM 574795100 86 0 0.00 3 0.00 0.0000
2015-05-14 2015-03-31 13F MASIMO COM 574795100 86 86 10.26 3 50.00 0.0000
2013-11-14 2013-09-30 13F MASIMO COM 574795100 0 -78 -100.00 0 -100.00
2013-08-14 2013-06-30 13F MASIMO COM 574795100 78 78 2 0.0000
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.