Masimo Corporation
US ˙ NasdaqGS ˙ US5747951003

SecurityMASI / Masimo Corporation
InstitutionBessemer Group Inc
Latest Disclosed Ownership1,857 shares
Latest Disclosed Value $ 331
Bessemer Group Inc reports 1,217.02% increase in ownership of MASI / Masimo Corporation

On May 6, 2026 - Bessemer Group Inc filed a 13F-HR form disclosing ownership of 1,857 shares of Masimo Corporation (US:MASI) valued at $330,305 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 141 shares of Masimo Corporation. The current value of the position is $331,994 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)
2026-05-06 2026-03-31 13F MASIMO SC 574795100 1,857 1,716 1,217.02 0 0.0005
2026-02-05 2025-12-31 13F MASIMO SC 574795100 141 0 0.00 0 0.0000
2025-11-05 2025-09-30 13F MASIMO SC 574795100 141 14 11.02 0 0.0000
2025-08-01 2025-06-30 13F MASIMO SC 574795100 127 6 4.96 0 0.0000
2025-04-23 2025-03-31 13F MASIMO SC 574795100 121 -25 -17.12 0 0.0000
2025-02-13 2024-12-31 13F MASIMO SC 574795100 146 50 52.08 0 0.0000
2024-11-12 2024-09-30 13F MASIMO SC 574795100 96 26 37.14 0 0.0000
2024-08-13 2024-06-30 13F MASIMO SC 574795100 70 0 0.00 0 0.0000
2024-08-13 2024-03-31 13F/A-1 MASIMO SC 574795100 70 -2,337 -97.09 0 0.0000
2024-05-13 2024-03-31 13F MASIMO SC 574795100 70 -2,337 0 0.0000
2024-02-09 2023-12-31 13F MASIMO SC 574795100 2,407 -150 -5.87 0 0.0005
2023-11-13 2023-09-30 13F MASIMO SC 574795100 2,557 -36,443 -93.44 0 -100.00 0.0005
2023-08-10 2023-06-30 13F MASIMO SC 574795100 39,000 2,614 7.18 6 0.00 0.0136
2023-05-10 2023-03-31 13F MASIMO SC 574795100 36,386 5,483 17.74 7 50.00 0.0159
2023-02-13 2022-12-31 13F MASIMO SC 574795100 30,903 1,043 3.49 5 -99.91 0.0111
2022-11-09 2022-09-30 13F MASIMO SC 574795100 29,860 8,258 38.23 4,215 49.31 0.0110
2022-08-10 2022-06-30 13F MASIMO SC 574795100 21,602 18,883 694.48 2,823 612.88 0.0070
2022-05-12 2022-03-31 13F MASIMO SC 574795100 2,719 729 36.63 396 -31.96 0.0008
2022-01-27 2021-12-31 13F MASIMO SC 574795100 1,990 970 95.10 582 110.87 0.0012
2021-11-12 2021-09-30 13F MASIMO SC 574795100 1,020 25 2.51 276 14.52 0.0006
2021-08-06 2021-06-30 13F MASIMO SC 574795100 995 -174 -14.88 241 -10.07 0.0005
2021-05-13 2021-03-31 13F MASIMO SC 574795100 1,169 174 17.49 268 0.37 0.0006
2021-02-09 2020-12-31 13F MASIMO SC 574795100 995 -20 -1.97 267 11.72 0.0007
2020-11-12 2020-09-30 13F MASIMO SC 574795100 1,015 -19,520 -95.06 239 -94.90 0.0007
2020-08-05 2020-06-30 13F MASIMO SC 574795100 20,535 3,617 21.38 4,682 56.28 0.0148
2020-04-30 2020-03-31 13F MASIMO SC 574795100 16,918 0 0.00 2,996 12.04 0.0121
2020-02-04 2019-12-31 13F MASIMO SC 574795100 16,918 18 0.11 2,674 6.32 0.0087
2019-11-07 2019-09-30 13F MASIMO SC 574795100 16,900 0 0.00 2,515 0.00 0.0090
2019-07-19 2019-06-30 13F MASIMO SC 574795100 16,900 -17 -0.10 2,515 7.52 0.0085
2019-05-13 2019-03-31 13F MASIMO SC 574795100 16,917 17 0.10 2,339 28.87 0.0090
2019-05-21 2018-12-31 13F/A-1 MASIMO SC 574795100 16,900 -1,300 -7.14 1,815 -19.94 0.0079
2019-02-12 2018-12-31 13F MASIMO SC 574795100 16,900 -1,300 1,815 0.0079
2018-11-06 2018-09-30 13F MASIMO SC 574795100 18,200 -4,500 -19.82 2,267 2.26 0.0084
2018-07-25 2018-06-30 13F MASIMO SC 574795100 22,700 0 0.00 2,217 11.07 0.0086
2018-05-10 2018-03-31 13F MASIMO SC 574795100 22,700 0 0.00 1,996 3.69 0.0078
2018-01-30 2017-12-31 13F MASIMO SC 574795100 22,700 -8,543 -27.34 1,925 -28.81 0.0075
2017-11-03 2017-09-30 13F MASIMO SC 574795100 31,243 -48 -0.15 2,704 -5.22 0.0108
2017-07-27 2017-06-30 13F MASIMO SC 574795100 31,291 -9 -0.03 2,853 -2.26 0.0115
2017-05-12 2017-03-31 13F MASIMO SC 574795100 31,300 -6,700 -17.63 2,919 13.98 0.0122
2017-02-07 2016-12-31 13F MASIMO SC 574795100 38,000 -344 -0.90 2,561 12.28 0.0118
2016-11-10 2016-09-30 13F MASIMO SC 574795100 38,344 38,344 2,281 0.0115
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.