馬西莫公司
MX ˙ BMV ˙ US5747951003
SecurityMX:MASI / Masimo Corporation
InstitutionCreative Planning
Latest Disclosed Ownership22,920 shares
Latest Disclosed Value $ 4,076,697
Creative Planning ownership in MASI / Masimo Corporation

On May 12, 2026 - Creative Planning filed a 13F-HR form disclosing ownership of 22,920 shares of Masimo Corporation (MX:MASI) valued at $4,076,697 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 17,109 shares of Masimo Corporation. This represents a change in shares of 33.96% during the quarter.

Creative Planning has a history of taking positions in derivatives of the underlying security (MASI) in the form of stock options.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:MASI / Masimo Corporation Historical Put/Call Ratio
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)
2026-05-12 2026-03-31 13F MASIMO COM 574795100 22,920 5,811 33.96 4,077 83.19 0.0027
2026-02-17 2025-12-31 13F MASIMO COM 574795100 17,109 6,075 55.06 2,225 36.67 0.0016
2025-11-14 2025-09-30 13F MASIMO COM 574795100 11,034 -136 -1.22 1,628 -13.36 0.0012
2025-08-08 2025-06-30 13F MASIMO COM 574795100 11,170 -48 -0.43 1,879 0.59 0.0016
2025-05-15 2025-03-31 13F MASIMO COM 574795100 11,218 -2,979 -20.98 1,869 -20.38 0.0018
2025-02-14 2024-12-31 13F MASIMO COM 574795100 14,197 -503 -3.42 2,347 19.75 0.0023
2024-10-11 2024-09-30 13F MASIMO COM 574795100 14,700 -916 -5.87 1,960 -0.36 0.0019
2024-08-15 2024-06-30 13F MASIMO COM 574795100 15,616 -1,080 -6.47 1,967 -19.79 0.0021
2024-05-13 2024-03-31 13F MASIMO COM 574795100 16,696 -3,073 -15.54 2,452 5.78 0.0027
2024-02-14 2023-12-31 13F MASIMO COM 574795100 19,769 1,483 8.11 2,317 44.54 0.0043
2023-11-16 2023-09-30 13F MASIMO COM 574795100 18,286 3,581 24.35 1,603 -33.73 0.0021
2023-07-21 2023-06-30 13F MASIMO COM 574795100 14,705 3,332 29.30 2,420 15.30 0.0032
2023-05-15 2023-03-31 13F MASIMO COM 574795100 11,373 -354 -3.02 2,099 20.99 0.0030
2023-02-10 2022-12-31 13F MASIMO COM 574795100 11,727 677 6.13 1,735 11.15 0.0026
2022-11-03 2022-09-30 13F MASIMO COM 574795100 11,050 661 6.36 1,560 14.87 0.0027
2022-08-15 2022-06-30 13F MASIMO COM 574795100 10,389 450 4.53 1,358 -6.09 0.0022
2022-05-16 2022-03-31 13F MASIMO COM 574795100 9,939 1,210 13.86 1,446 -43.43 0.0022
2022-02-11 2021-12-31 13F MASIMO COM 574795100 8,729 92 1.07 2,556 9.32 0.0041
2021-11-10 2021-09-30 13F MASIMO COM 574795100 8,637 -116 -1.33 2,338 10.18 0.0041
2021-08-04 2021-06-30 13F MASIMO COM 574795100 8,753 -121 -1.36 2,122 4.12 0.0038
2021-04-30 2021-03-31 13F CreativePlanning COM 574795100 8,874 396 4.67 2,038 -10.42 0.0041
2021-01-29 2020-12-31 13F MASIMO COM 574795100 8,478 -7,468 -46.83 2,275 -39.56 0.0050
2020-11-05 2020-09-30 13F MASIMO COM 574795100 15,946 15,946 3,764 0.0098
2018-01-17 2017-12-31 13F MASIMO COM 574795100 0 -3,056 -100.00 0 -100.00
2017-10-17 2017-09-30 13F MASIMO COM 574795100 3,056 2,170 244.92 265 227.16 0.0012
2017-07-12 2017-06-30 13F MASIMO COM 574795100 886 23 2.67 81 1.25 0.0004
2017-04-07 2017-03-31 13F MASIMO COM 574795100 863 779 927.38 80 1,233.33 0.0004
2017-01-09 2016-12-31 13F MASIMO COM 574795100 84 67 394.12 6 500.00 0.0000
2016-10-12 2016-09-30 13F MASIMO COM 574795100 17 9 112.50 1 0.0000
2016-07-12 2016-06-30 13F MASIMO COM 574795100 8 -80 -90.91 0 -100.00
2016-04-08 2016-03-31 13F MASIMO COM 574795100 88 -51 -36.69 4 -33.33 0.0000
2016-01-11 2015-12-31 13F MASIMO COM 574795100 139 39 39.00 6 50.00 0.0000
2015-10-09 2015-09-30 13F MASIMO COM 574795100 100 100 0.00 4 0.0000
2015-07-09 2015-06-30 13F MASIMO COM 574795100 0 -104 -100.00 0 -100.00
2015-04-13 2015-03-31 13F MASIMO COM 574795100 104 104 0.00 3 0.0000
2015-01-29 2014-12-31 13F MASIMO COM 574795100 0 -1,204 -100.00 0 -100.00
2014-10-10 2014-09-30 13F MASIMO COM 574795100 1,204 1,200 30,000.00 26 0.0003
2014-08-20 2014-06-30 13F MASIMO COM 574795100 4 0 0.00 0 0.0000
2014-04-11 2014-03-31 13F MASIMO COM 574795100 4 0 0.00 0 0.0000
2014-01-06 2013-12-31 13F MASIMO COM 574795100 4 0 0.00 0 0.0000
2013-10-10 2013-09-30 13F MASIMO COM 574795100 4 0 0.00 0 0.0000
2013-07-09 2013-06-30 13F MASIMO COM 574795100 4 4 0 0.0000
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2021-08-04 2021-06-30 13F CreativePlanning COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2021-04-30 2021-03-31 13F CreativePlanning COM Put 5,000 900.00 90 n/a n/a n/a
2021-01-29 2020-12-31 13F MASIMO COM Put 500 -94.44 0 -100.00 n/a n/a n/a
2020-11-05 2020-09-30 13F MASIMO COM Put 9,000 53 n/a n/a n/a
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.