Masimo Corporation
MX ˙ BMV ˙ US5747951003
SecurityMX:MASI / Masimo Corporation
InstitutionM&t Bank Corp
Latest Disclosed Ownership3,516 shares
Latest Disclosed Value $ 625,392
M&t Bank Corp reports 5.78% increase in ownership of MASI / Masimo Corporation

On May 12, 2026 - M&t Bank Corp filed a 13F-HR form disclosing ownership of 3,516 shares of Masimo Corporation (MX:MASI) valued at $625,392 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on January 30, 2026 disclosing 3,324 shares of Masimo Corporation. This represents a change in shares of 5.78% 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)
2026-05-12 2026-03-31 13F MASIMO COM 574795100 3,516 192 5.78 625 45.01 0.0005
2026-01-30 2025-12-31 13F/A-1 MASIMO COM 574795100 3,324 317 10.54 432 -2.93 0.0014
2026-01-28 2025-12-31 13F MASIMO COM 574795100 9,585 6,578 882 0.0005
2025-11-14 2025-09-30 13F MASIMO COM 574795100 3,007 248 8.99 444 -4.31 0.0015
2025-08-13 2025-06-30 13F MASIMO COM 574795100 2,759 575 26.33 464 27.47 0.0016
2025-04-30 2025-03-31 13F MASIMO COM 574795100 2,184 -476 -17.89 364 -17.27 0.0013
2025-02-06 2024-12-31 13F MASIMO COM 574795100 2,660 124 4.89 440 30.18 0.0015
2024-11-19 2024-09-30 13F/A-1 MASIMO COM 574795100 2,536 56 2.26 338 8.33 0.0011
2024-11-15 2024-09-30 13F MASIMO COM 574795100 2,536 56 338 0.0002
2024-07-31 2024-06-30 13F MASIMO COM 574795100 2,480 22 0.90 313 -13.33 0.0011
2024-05-07 2024-03-31 13F MASIMO COM 574795100 2,458 80 3.36 361 29.50 0.0013
2024-02-06 2023-12-31 13F MASIMO COM 574795100 2,378 2,378 279 0.0010
2023-11-02 2023-09-30 13F MASIMO COM 574795100 0 -1,636 -100.00 0 -100.00
2023-08-09 2023-06-30 13F MASIMO COM 574795100 1,636 -139 -7.83 269 -18.04 0.0010
2023-05-11 2023-03-31 13F MASIMO COM 574795100 1,775 1 0.06 327 24.81 0.0013
2023-02-13 2022-12-31 13F/A-1 MASIMO COM 574795100 1,774 -63 -3.43 262 1.16 0.0011
2023-02-13 2022-12-31 13F MASCO COM 574795100 1,856 19 263 0.0011
2022-11-17 2022-09-30 13F/A-1 MASIMO COM 574795100 1,837 28 1.55 259 11.16 0.0012
2022-11-14 2022-09-30 13F MASIMO COM 574795100 1,837 28 255 0.0002
2022-08-05 2022-06-30 13F MASIMO COM 574795100 1,809 -157 -7.99 233 -18.53 0.0011
2022-05-09 2022-03-31 13F MASIMO COM 574795100 1,966 -161 -7.57 286 -54.17 0.0013
2022-02-07 2021-12-31 13F MASIMO COM 574795100 2,127 -40 -1.85 624 6.12 0.0026
2021-10-28 2021-09-30 13F MASIMO COM 574795100 2,167 -150 -6.47 588 4.63 0.0026
2021-08-13 2021-06-30 13F MASIMO COM 574795100 2,317 31 1.36 562 6.84 0.0025
2021-05-06 2021-03-31 13F MASIMO COM 574795100 2,286 342 17.59 526 0.57 0.0023
2021-02-12 2020-12-31 13F MASIMO COM 574795100 1,944 110 6.00 523 20.79 0.0023
2020-11-06 2020-09-30 13F MASIMO COM 574795100 1,834 3 0.16 433 3.84 0.0021
2020-07-29 2020-06-30 13F MASIMO COM 574795100 1,831 509 38.50 417 78.21 0.0022
2020-05-14 2020-03-31 13F MASIMO COM 574795100 1,322 1,322 234 0.0014
2020-02-07 2019-12-31 13F MASIMO COM 574795100 0 -1,753 -100.00 0 -100.00
2019-11-12 2019-09-30 13F MASIMO COM 574795100 1,753 -549 -23.85 261 -23.91 0.0013
2019-08-12 2019-06-30 13F MASIMO COM 574795100 2,302 388 20.27 343 29.43 0.0018
2019-05-15 2019-03-31 13F MASIMO COM 574795100 1,914 1,914 265 0.0014
2019-02-01 2018-12-31 13F MASIMO COM 574795100 0 -2,590 -100.00 0 -100.00
2018-11-09 2018-09-30 13F MASIMO COM 574795100 2,590 -4,649 -64.22 323 -54.31 0.0016
2018-08-10 2018-06-30 13F MASIMO COM 574795100 7,239 -1,040 -12.56 707 -2.88 0.0038
2018-05-04 2018-03-31 13F MASIMO COM 574795100 8,279 151 1.86 728 5.51 0.0039
2018-02-06 2017-12-31 13F MASIMO COM 574795100 8,128 141 1.77 690 -0.14 0.0036
2017-11-13 2017-09-30 13F MASIMO COM 574795100 7,987 -809 -9.20 691 -13.73 0.0037
2017-08-11 2017-06-30 13F MASIMO COM 574795100 8,796 16 0.18 801 -2.20 0.0047
2017-05-10 2017-03-31 13F MASIMO COM 574795100 8,780 -733 -7.71 819 27.57 0.0049
2017-02-14 2016-12-31 13F MASIMO COM 574795100 9,513 684 7.75 642 22.29 0.0040
2016-11-04 2016-09-30 13F MASIMO COM 574795100 8,829 348 4.10 525 18.24 0.0033
2016-08-04 2016-06-30 13F MASIMO COM 574795100 8,481 1,349 18.91 444 48.99 0.0030
2016-05-11 2016-03-31 13F MASIMO COM 574795100 7,132 -87 -1.21 298 -0.33 0.0020
2016-02-12 2015-12-31 13F MASIMO COM 574795100 7,219 -232 -3.11 299 4.18 0.0020
2015-11-13 2015-09-30 13F MASIMO COM 574795100 7,451 -2,804 -27.34 287 -27.71 0.0020
2015-08-14 2015-06-30 13F MASIMO COM 574795100 10,255 538 5.54 397 24.06 0.0024
2015-05-14 2015-03-31 13F MASIMO COM 574795100 9,717 57 0.59 320 25.49 0.0020
2015-02-12 2014-12-31 13F MASIMO COM 574795100 9,660 -1,766 -15.46 255 4.94 0.0016
2014-11-14 2014-09-30 13F MASIMO COM 574795100 11,426 11,426 243 0.0017
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.