Masimo Corporation
US ˙ NasdaqGS ˙ US5747951003

SecurityMASI / Masimo Corporation
InstitutionSquarepoint Ops LLC
Latest Disclosed Ownership389,359 shares
Latest Disclosed Value $ 69,255,285
Squarepoint Ops LLC reports 33.30% decrease in ownership of MASI / Masimo Corporation

On May 15, 2026 - Squarepoint Ops LLC filed a 13F-HR form disclosing ownership of 389,359 shares of Masimo Corporation (US:MASI) valued at $69,255,285 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 583,747 shares of Masimo Corporation. This represents a change in shares of -33.30% during the quarter. The current value of the position is $69,609,602 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.

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)
2026-05-15 2026-03-31 13F MASIMO COM 574795100 389,359 -194,388 -33.30 69,255 -8.78 0.0814
2026-02-13 2025-12-31 13F MASIMO COM 574795100 583,747 -37,185 -5.99 75,922 -17.13 0.0808
2025-11-14 2025-09-30 13F MASIMO COM 574795100 620,932 546,905 738.79 91,619 635.77 0.0920
2025-08-27 2025-06-30 13F/A-1 MASIMO COM 574795100 74,027 57,359 344.13 12,453 348.56 0.0129
2025-08-14 2025-06-30 13F MASIMO COM 574795100 74,027 57,359 12,453 0.0129
2025-08-27 2025-03-31 13F/A-1 MASIMO COM 574795100 16,668 16,668 2,777 0.0034
2025-05-15 2025-03-31 13F MASIMO COM 574795100 16,668 16,668 2,777 0.0034
2025-02-14 2024-12-31 13F MASIMO COM 574795100 0 -53,226 -100.00 0 -100.00
2024-11-14 2024-09-30 13F MASIMO COM 574795100 53,226 43,540 449.51 7,097 482.12 0.0111
2024-08-14 2024-06-30 13F MASIMO COM 574795100 9,686 9,686 1,220 0.0020
2023-11-14 2023-09-30 13F MASIMO COM 574795100 0 -18,451 -100.00 0 -100.00
2023-08-14 2023-06-30 13F MASIMO COM 574795100 18,451 18,451 3,036 0.0093
2023-05-15 2023-03-31 13F MASIMO COM 574795100 0 -19,862 -100.00 0 -100.00
2023-02-14 2022-12-31 13F MASIMO COM 574795100 19,862 16,101 428.10 2,939 453.30 0.0116
2022-11-14 2022-09-30 13F MASIMO COM 574795100 3,761 -2,318 -38.13 531 -33.12 0.0027
2022-08-15 2022-06-30 13F MASIMO COM 574795100 6,079 -125,226 -95.37 794 -95.85 0.0044
2022-05-16 2022-03-31 13F MASIMO COM 574795100 131,305 79,429 153.11 19,110 25.82 0.0818
2022-02-14 2021-12-31 13F MASIMO COM 574795100 51,876 40,272 347.05 15,188 383.54 0.0402
2021-11-15 2021-09-30 13F MASIMO COM 574795100 11,604 11,604 3,141 0.0090
2021-08-16 2021-06-30 13F MASIMO COM 574795100 0 -1,787 -100.00 0 -100.00
2021-05-17 2021-03-31 13F MASIMO COM 574795100 1,787 -6,899 -79.43 410 -82.41 0.0024
2021-02-16 2020-12-31 13F MASIMO COM 574795100 8,686 8,686 386.07 2,331 468.54 0.0174
2020-11-16 2020-09-30 13F MASIMO COM 574795100 0 -24,658 -100.00 0 -100.00
2020-08-14 2020-06-30 13F MASIMO COM 574795100 24,658 18,720 315.26 5,622 434.41 0.0909
2020-05-15 2020-03-31 13F MASIMO COM 574795100 5,938 -13,873 -70.03 1,052 -66.40 0.0269
2020-02-14 2019-12-31 13F MASIMO COM 574795100 19,811 -3,654 -15.57 3,131 -10.31 0.0186
2019-11-14 2019-09-30 13F MASIMO COM 574795100 23,465 2,158 10.13 3,491 10.09 0.0312
2019-08-14 2019-06-30 13F MASIMO COM 574795100 21,307 7,900 58.92 3,171 71.04 0.0309
2019-05-15 2019-03-31 13F MASIMO COM 574795100 13,407 -91,105 -87.17 1,854 -83.48 0.0196
2019-02-14 2018-12-31 13F MASIMO COM 574795100 104,512 71,803 219.52 11,221 175.43 0.1306
2018-11-14 2018-09-30 13F MASIMO COM 574795100 32,709 -70,751 -68.38 4,074 -59.68 0.0487
2018-08-14 2018-06-30 13F MASIMO COM 574795100 103,460 100,635 3,562.30 10,103 3,973.79 0.1339
2018-05-15 2018-03-31 13F MASIMO COM 574795100 2,825 -20,150 -87.70 248 -87.27 0.0039
2018-02-14 2017-12-31 13F MASIMO COM 574795100 22,975 -36,412 -61.31 1,948 -62.11 0.0339
2017-11-14 2017-09-30 13F MASIMO COM 574795100 59,387 -10,821 -15.41 5,141 -19.70 0.0989
2017-08-14 2017-06-30 13F MASIMO COM 574795100 70,208 4,955 7.59 6,402 5.21 0.1260
2017-05-15 2017-03-31 13F MASIMO COM 574795100 65,253 55,534 571.40 6,085 829.01 0.1678
2017-02-14 2016-12-31 13F MASIMO COM 574795100 9,719 2,545 35.48 655 53.40 0.0268
2016-11-14 2016-09-30 13F MASIMO COM 574795100 7,174 2,356 48.90 427 68.77 0.0283
2016-08-15 2016-06-30 13F MASIMO COM 574795100 4,818 4,818 253 0.0158
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.