마시모 코퍼레이션
MX ˙ BMV ˙ US5747951003
SecurityMX:MASI / Masimo Corporation
InstitutionProShare Advisors LLC
Latest Disclosed Ownership3,917 shares
Latest Disclosed Value $ 696,717
ProShare Advisors LLC reports 114.04% increase in ownership of MASI / Masimo Corporation

On April 24, 2026 - ProShare Advisors LLC filed a 13F-HR form disclosing ownership of 3,917 shares of Masimo Corporation (MX:MASI) valued at $696,717 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 1,830 shares of Masimo Corporation. This represents a change in shares of 114.04% 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)
2026-04-24 2026-03-31 13F MASIMO COM 574795100 3,917 2,087 114.04 697 192.44 0.0010
2026-02-06 2025-12-31 13F MASIMO COM 574795100 1,830 -134 -6.82 238 -17.65 0.0004
2025-11-06 2025-09-30 13F MASIMO COM 574795100 1,964 -31 -1.55 290 -13.73 0.0006
2025-08-07 2025-06-30 13F MASIMO COM 574795100 1,995 101 5.33 336 6.35 0.0007
2025-05-08 2025-03-31 13F MASIMO COM 574795100 1,894 -184 -8.85 316 -8.16 0.0007
2025-02-14 2024-12-31 13F MASIMO COM 574795100 2,078 153 7.95 343 33.98 0.0008
2024-11-14 2024-09-30 13F MASIMO COM 574795100 1,925 -178 -8.46 257 -3.03 0.0006
2024-08-13 2024-06-30 13F MASIMO COM 574795100 2,103 -61 -2.82 265 -16.72 0.0007
2024-05-08 2024-03-31 13F MASIMO COM 574795100 2,164 -172 -7.36 318 16.12 0.0008
2024-02-14 2023-12-31 13F MASIMO COM 574795100 2,336 -60 -2.50 274 30.00 0.0008
2023-11-13 2023-09-30 13F MASIMO COM 574795100 2,396 -441 -15.54 210 -54.94 0.0007
2023-08-10 2023-06-30 13F MASIMO COM 574795100 2,837 -185 -6.12 467 -16.34 0.0014
2023-05-26 2023-03-31 13F/A-1 MASIMO COM 574795100 3,022 -688 -18.54 558 1.64 0.0017
2023-05-12 2023-03-31 13F MASIMO COM 574795100 3,022 -688 558 0.0018
2023-02-02 2022-12-31 13F MASIMO COM 574795100 3,710 301 8.83 549 13.69 0.0019
2022-11-07 2022-09-30 13F MASIMO COM 574795100 3,409 -234 -6.42 482 1.47 0.0018
2022-08-01 2022-06-30 13F MASIMO COM 574795100 3,643 -1,413 -27.95 475 -35.37 0.0016
2022-05-10 2022-03-31 13F MASIMO COM 574795100 5,056 -807 -13.76 735 -57.19 0.0016
2022-02-08 2021-12-31 13F MASIMO COM 574795100 5,863 1,168 24.88 1,717 35.09 0.0034
2021-11-12 2021-09-30 13F MASIMO COM 574795100 4,695 -956 -16.92 1,271 -7.23 0.0036
2021-08-13 2021-06-30 13F MASIMO COM 574795100 5,651 784 16.11 1,370 22.54 0.0040
2021-05-14 2021-03-31 13F MASIMO COM 574795100 4,867 -10 -0.21 1,118 -14.59 0.0035
2021-02-09 2020-12-31 13F MASIMO COM 574795100 4,877 591 13.79 1,309 29.35 0.0049
2020-11-13 2020-09-30 13F MASIMO COM 574795100 4,286 188 4.59 1,012 8.35 0.0047
2020-08-03 2020-06-30 13F MASIMO COM 574795100 4,098 1,405 52.17 934 95.81 0.0050
2020-05-15 2020-03-31 13F MASIMO COM 574795100 2,693 -2,636 -49.47 477 -43.35 0.0034
2020-02-12 2019-12-31 13F MASIMO COM 574795100 5,329 485 10.01 842 16.78 0.0039
2019-11-12 2019-09-30 13F MASIMO COM 574795100 4,844 -249 -4.89 721 -4.88 0.0040
2019-08-13 2019-06-30 13F MASIMO COM 574795100 5,093 -918 -15.27 758 -8.78 0.0045
2019-05-15 2019-03-31 13F MASIMO COM 574795100 6,011 1,343 28.77 831 65.87 0.0050
2019-02-14 2018-12-31 13F MASIMO COM 574795100 4,668 -989 -17.48 501 -28.94 0.0035
2018-11-14 2018-09-30 13F MASIMO COM 574795100 5,657 470 9.06 705 39.05 0.0048
2018-08-13 2018-06-30 13F MASIMO COM 574795100 5,187 -5,769 -52.66 507 -47.41 0.0034
2018-05-14 2018-03-31 13F MASIMO COM 574795100 10,956 -1,090 -9.05 964 -5.68 0.0063
2018-02-14 2017-12-31 13F MASIMO COM 574795100 12,046 4,781 65.81 1,022 62.48 0.0071
2017-11-13 2017-09-30 13F MASIMO COM 574795100 7,265 156 2.19 629 -2.93 0.0058
2017-08-11 2017-06-30 13F MASIMO COM 574795100 7,109 -1,309 -15.55 648 -17.45 0.0065
2017-05-12 2017-03-31 13F/A-2 MASIMO COM 574795100 8,418 870 11.53 785 54.22 0.0082
2017-05-08 2017-03-31 13F/A-1 MASIMO COM 574795100 8,418 0 785 0.0082
2017-04-25 2017-03-31 13F MASIMO COM 574795100 8,418 785
2017-02-13 2016-12-31 13F MASIMO COM 574795100 7,548 2,641 53.82 509 74.32 0.0056
2016-11-10 2016-09-30 13F MASIMO COM 574795100 4,907 -1,080 -18.04 292 -7.01 0.0041
2016-08-12 2016-06-30 13F MASIMO COM 574795100 5,987 -387 -6.07 314 17.60 0.0040
2016-05-06 2016-03-31 13F MASIMO COM 574795100 6,374 -1,116 -14.90 267 -14.15 0.0037
2016-02-05 2015-12-31 13F MASIMO COM 574795100 7,490 7,490 0.00 311 0.0038
2015-11-06 2015-09-30 13F MASIMO COM 574795100 0 -6,381 -100.00 0 -100.00
2015-08-11 2015-06-30 13F MASIMO COM 574795100 6,381 -3,541 -35.69 247 -24.46 0.0034
2015-05-08 2015-03-31 13F MASIMO COM 574795100 9,922 9,922 0.00 327 0.0039
2015-01-30 2014-12-31 13F MASIMO COM 574795100 0 -20,505 -100.00 0 -100.00
2014-11-06 2014-09-30 13F MASIMO COM 574795100 20,505 -7,132 -25.81 436 -33.13 0.0058
2014-08-08 2014-06-30 13F MASIMO COM 574795100 27,637 -28,340 -50.63 652 -57.36 0.0084
2014-05-07 2014-03-31 13F MASIMO COM 574795100 55,977 13,988 33.31 1,529 24.61 0.0191
2014-02-04 2013-12-31 13F MASIMO COM 574795100 41,989 5,452 14.92 1,227 26.10 0.0183
2013-11-07 2013-09-30 13F MASIMO COM 574795100 36,537 157 0.43 973 26.20 0.0231
2013-07-25 2013-06-30 13F MASIMO COM 574795100 36,380 36,380 771 0.0151
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.