Masimo Corporation
MX ˙ BMV ˙ US5747951003
SecurityMX:MASI / Masimo Corporation
InstitutionSG Americas Securities, LLC
Latest Disclosed Ownership522,824 shares
Latest Disclosed Value $ 92,995
SG Americas Securities, LLC reports 3,082.32% increase in ownership of MASI / Masimo Corporation

On April 16, 2026 - SG Americas Securities, LLC filed a 13F-HR form disclosing ownership of 522,824 shares of Masimo Corporation (MX:MASI) valued at $92,995 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 9, 2026 disclosing 16,429 shares of Masimo Corporation. This represents a change in shares of 3,082.32% 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)
2026-04-16 2026-03-31 13F MASIMO CORP COM COM 574795100 522,824 506,395 3,082.32 93 4,500.00 0.0998
2026-01-09 2025-12-31 13F MASIMO CORP COM COM 574795100 16,429 7,510 84.20 2 100.00 0.0027
2025-10-23 2025-09-30 13F MASIMO CORP COM COM 574795100 8,919 -5,847 -39.60 1 -50.00 0.0044
2025-08-08 2025-06-30 13F MASIMO CORP COM COM 574795100 14,766 13,143 809.80 2 0.0103
2025-04-15 2025-03-31 13F MASIMO CORP COM COM 574795100 1,623 1,623 0 0.0009
2025-01-17 2024-12-31 13F MASIMO CORP COM COM 574795100 0 -28,967 -100.00 0 -100.00
2024-10-03 2024-09-30 13F MASIMO CORP COM COM 574795100 28,967 28,967 4 0.0140
2024-07-12 2024-06-30 13F MASIMO CORP COM COM 574795100 0 -1,979 -100.00 0 0.0000
2024-05-06 2024-03-31 13F MASIMO CORP COM COM 574795100 1,979 -2,030 -50.64 0 0.0014
2024-01-12 2023-12-31 13F MASIMO CORP COM COM 574795100 4,009 -8,705 -68.47 0 -100.00 0.0044
2023-10-13 2023-09-30 13F MASIMO CORP COM COM 574795100 12,714 2,995 30.82 1 0.00 0.0127
2023-07-10 2023-06-30 13F MASIMO CORP COM COM 574795100 9,719 3,324 51.98 2 0.00 0.0121
2023-04-28 2023-03-31 13F MASIMO CORP COM COM 574795100 6,395 5,030 368.50 1 0.0137
2023-02-02 2022-12-31 13F MASIMO CORP COM COM 574795100 1,365 1,365 0 0.0025
2022-10-31 2022-09-30 13F MASIMO CORP COM COM 574795100 0 -16,474 -100.00 0 -100.00
2022-07-29 2022-06-30 13F MASIMO CORP COM COM 574795100 16,474 9,202 126.54 2,153 103.50 0.0229
2022-04-29 2022-03-31 13F MASIMO CORP COM COM 574795100 7,272 3,979 120.83 1,058 9.75 0.0078
2022-02-07 2021-12-31 13F MASIMO CORP COM COM 574795100 3,293 -3,148 -48.87 964 -44.72 0.0052
2021-11-01 2021-09-30 13F MASIMO CORP COM COM 574795100 6,441 -5,935 -47.96 1,744 -41.89 0.0082
2021-08-12 2021-06-30 13F MASIMO CORP COM COM 574795100 12,376 4,473 56.60 3,001 65.34 0.0140
2021-05-13 2021-03-31 13F MASIMO CORP COM COM 574795100 7,903 -3,993 -33.57 1,815 -43.16 0.0095
2021-02-04 2020-12-31 13F MASIMO CORP COM COM 574795100 11,896 11,003 1,232.14 3,193 1,413.27 0.0170
2020-11-09 2020-09-30 13F MASIMO CORP COM COM 574795100 893 -6,673 -88.20 211 -87.77 0.0013
2020-07-20 2020-06-30 13F MASIMO CORP COM COM 574795100 7,566 3,501 86.13 1,725 139.58 0.0144
2020-04-30 2020-03-31 13F MASIMO CORP COM COM 574795100 4,065 -27,263 -87.02 720 -85.46 0.0068
2020-01-28 2019-12-31 13F MASIMO CORP COM COM 574795100 31,328 13,359 74.34 4,952 85.19 0.0452
2019-11-04 2019-09-30 13F MASIMO CORP COM COM 574795100 17,969 907 5.32 2,674 5.32 0.0219
2019-07-29 2019-06-30 13F MASIMO CORP COM COM 574795100 17,062 12,340 261.33 2,539 288.82 0.0175
2019-04-29 2019-03-31 13F MASIMO CORP COM COM 574795100 4,722 -1,954 -29.27 653 -8.93 0.0060
2019-01-31 2018-12-31 13F MASIMO CORP COM COM 574795100 6,676 -17,405 -72.28 717 -76.09 0.0063
2018-11-06 2018-09-30 13F MASIMO CORP COM COM 574795100 24,081 756 3.24 2,999 31.65 0.0222
2018-08-07 2018-06-30 13F MASIMO CORP COM COM 574795100 23,325 10,664 84.23 2,278 104.49 0.0205
2018-05-03 2018-03-31 13F MASIMO CORP COM COM 574795100 12,661 -8,334 -39.70 1,114 -37.42 0.0089
2018-01-24 2017-12-31 13F MASIMO CORP COM COM 574795100 20,995 15,771 301.90 1,780 293.81 0.0166
2017-11-07 2017-09-30 13F MASIMO CORP COM COM 574795100 5,224 -13,032 -71.38 452 -72.85 0.0040
2017-08-03 2017-06-30 13F MASIMO CORP COM COM 574795100 18,256 6,385 53.79 1,665 50.41 0.0150
2017-05-10 2017-03-31 13F MASIMO CORP COM COM 574795100 11,871 9,126 332.46 1,107 498.38 0.0098
2017-02-08 2016-12-31 13F MASIMO CORP COM COM 574795100 2,745 -10,006 -78.47 185 -75.63 0.0016
2017-02-08 2016-09-30 13F/A-1 MASIMO CORP COM COM 574795100 12,751 7,486 142.18 759 175.00 0.0080
2016-11-08 2016-09-30 13F MASIMO CORP COM COM 574795100 12,751 759
2016-08-03 2016-06-30 13F MASIMO CORP COM COM 574795100 5,265 -24,573 -82.35 276 -77.88 0.0020
2016-05-12 2016-03-31 13F MASIMO CORP COM COM 574795100 29,838 23,313 357.29 1,248 360.52 0.0090
2016-02-12 2015-12-31 13F MASIMO CORP COM COM 574795100 6,525 6,525 0.00 271 0.0019
2015-11-09 2015-09-30 13F MASIMO CORP COM COM 574795100 0 -6,473 -100.00 0 -100.00
2015-08-06 2015-06-30 13F MASIMO CORP COM COM 574795100 6,473 -3,276 -33.60 251 -22.05 0.0017
2015-05-13 2015-03-31 13F MASIMO CORP COM COM 574795100 9,749 9,749 0.00 322 0.0019
2015-02-12 2014-12-31 13F MASIMO CORP COM COM 574795100 0 -20,601 -100.00 0 -100.00
2014-11-13 2014-09-30 13F MASIMO CORP COM COM 574795100 20,601 14,781 253.97 438 175.47 0.0026
2014-05-14 2014-03-31 13F MASIMO CORP COM COM 574795100 5,820 5,820 -80.02 159 -79.51 0.0007
2014-02-12 2013-12-31 13F MASIMO CORP COM COM 574795100 0 -29,131 -100.00 0 -100.00
2013-11-12 2013-09-30 13F MASIMO CORP COM COM 574795100 29,131 22,492 338.79 776 450.35 0.0032
2013-08-13 2013-06-30 13F MASIMO CORP COM COM 574795100 6,639 6,639 141 0.0007
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.