마시모 코퍼레이션
MX ˙ BMV ˙ US5747951003
SecurityMX:MASI / Masimo Corporation
InstitutionMan Group plc
Latest Disclosed Ownership166,235 shares
Latest Disclosed Value $ 29,568,219
Man Group plc reports 12.77% increase in ownership of MASI / Masimo Corporation

On May 15, 2026 - Man Group plc filed a 13F-HR form disclosing ownership of 166,235 shares of Masimo Corporation (MX:MASI) valued at $29,568,219 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 147,416 shares of Masimo Corporation. This represents a change in shares of 12.77% 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 166,235 18,819 12.77 29,568 54.22 0.0536
2026-02-17 2025-12-31 13F MASIMO COM 574795100 147,416 147,416 19,173 0.0326
2025-05-15 2025-03-31 13F MASIMO COM 574795100 0 -64,889 -100.00 0 -100.00
2025-02-14 2024-12-31 13F MASIMO COM 574795100 64,889 -335,056 -83.78 10,726 -79.89 0.0282
2024-11-14 2024-09-30 13F MASIMO COM 574795100 399,945 108,156 37.07 53,325 45.11 0.1388
2024-08-14 2024-06-30 13F MASIMO COM 574795100 291,789 291,789 36,748 0.0928
2024-05-15 2024-03-31 13F MASIMO COM 574795100 0 -41,955 -100.00 0 -100.00
2024-02-14 2023-12-31 13F MASIMO COM 574795100 41,955 4,918 1,403.67 0.0137
2023-11-14 2023-09-30 13F MASIMO COM 574795100 327 -93.89 0.0010
2023-08-14 2023-06-30 13F MASIMO COM 574795100 32,548 5,356 1,290.91 0.0165
2023-05-15 2023-03-31 13F MASIMO COM 574795100 386 -31.37 0.0014
2023-02-14 2022-12-31 13F MASIMO COM 574795100 3,795 561 -77.38 0.0020
2022-08-15 2022-06-30 13F MASIMO COM 574795100 2,480 -89.89 0.0105
2022-05-16 2022-03-31 13F MASIMO COM 574795100 168,607 124,645 283.53 24,539 90.65 0.0854
2022-02-14 2021-12-31 13F MASIMO COM 574795100 43,962 1,833 4.35 12,871 12.85 0.0414
2021-11-15 2021-09-30 13F MASIMO COM 574795100 42,129 18,461 78.00 11,405 98.76 0.0400
2021-08-16 2021-06-30 13F MASIMO COM 574795100 23,668 725 3.16 5,738 8.90 0.0202
2021-05-17 2021-03-31 13F MASIMO COM 574795100 22,943 -27,689 -54.69 5,269 -61.23 0.0232
2021-02-16 2020-12-31 13F MASIMO COM 574795100 50,632 -42,696 -45.75 13,589 -38.32 0.0597
2020-11-16 2020-09-30 13F MASIMO COM 574795100 93,328 12,117 14.92 22,031 18.99 0.0867
2020-08-14 2020-06-30 13F MASIMO COM 574795100 81,211 -26,243 -24.42 18,515 -2.72 0.0934
2020-05-15 2020-03-31 13F MASIMO COM 574795100 107,454 -85,134 -44.21 19,032 -37.48 0.1233
2020-02-18 2019-12-31 13F MASIMO COM 574795100 192,588 33,410 20.99 30,440 28.53 0.1001
2019-11-14 2019-09-30 13F MASIMO COM 574795100 159,178 -26,964 -14.49 23,684 -14.50 0.0880
2019-08-14 2019-06-30 13F MASIMO COM 574795100 186,142 -4,721 -2.47 27,702 4.96 0.1001
2019-05-15 2019-03-31 13F MASIMO COM 574795100 190,863 1,024 0.54 26,393 29.49 0.1001
2019-02-14 2018-12-31 13F MASIMO COM 574795100 189,839 -336 -0.18 20,383 -13.94 0.0907
2018-11-14 2018-09-30 13F MASIMO COM 574795100 190,175 43,824 29.94 23,684 65.73 0.0865
2018-08-14 2018-06-30 13F MASIMO COM 574795100 146,351 -67,271 -31.49 14,291 -23.94 0.0588
2018-05-15 2018-03-31 13F MASIMO COM 574795100 213,622 213,622 18,788 0.0860
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.