마시모 코퍼레이션
MX ˙ BMV ˙ US5747951003
SecurityMX:MASI / Masimo Corporation
InstitutionBlackRock, Inc.
Latest Disclosed Ownership4,231,142 shares
Ownership 7.90%
BlackRock, Inc. ownership in MASI / Masimo Corporation

2025-02-07 - BlackRock, Inc. has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 4,231,142 shares of Masimo Corporation (MX:MASI). This represents 7.9 percent ownership of the company. In their previous filing dated 2024-06-07 , BlackRock, Inc. had reported owning 8,480,230 shares, indicating a decrease of -50.11 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2025-02-07 2025-02-07 13G/A 8,480,230 4,231,142 -50.11 7.90 -50.62
2024-06-07 2024-06-07 13G/A 5,659,131 8,480,230 49.85 16.00 49.53
2024-01-24 2024-01-24 13G/A 5,956,832 5,659,131 -5.00 10.70 -5.31
2023-01-26 2023-01-26 13G/A 5,956,832 5,956,832 0.00 11.30 0.00
2023-01-20 2023-01-20 13G/A 6,055,213 5,956,832 -1.62 11.30 3.67
2022-06-09 2022-06-09 13G 9,026,374 6,055,213 -32.92 10.90 -33.13
2022-01-27 2022-01-27 13G/A 9,026,374 9,026,374 0.00 16.30 0.00
2022-01-26 2022-01-26 13G 8,316,524 9,026,374 8.54 16.30 7.95
2021-01-26 2021-01-26 13G/A 6,544,721 8,316,524 27.07 15.10 23.77
2020-02-04 2020-02-04 13G/A 7,167,269 6,544,721 -8.69 12.20 -9.63
2019-01-31 2019-01-31 13G/A 7,247,465 7,167,269 -1.11 13.50 -3.57
2018-01-19 2018-01-19 13G/A 6,794,388 7,247,465 6.67 14.00 2.19
2017-01-12 2017-01-12 13G/A 5,829,624 6,794,388 16.55 13.70 18.10
2016-01-08 2016-01-08 13G/A 5,360,456 5,829,624 8.75 11.60 13.73
2015-03-10 2015-03-10 13G/A 5,360,456 10.20
2015-01-15 2015-01-15 13G/A 4,950,716 9.40
2014-01-30 2014-01-30 13G/A 4,230,231 7.50
2013-02-05 2013-02-05 13G/A 3,913,696 6.84
2012-02-13 2012-02-13 13G/A 4,130,330 6.88

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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)
2026-05-13 2026-03-31 13F MASIMO COM 574795100 4,644,578 -4,211,041 -47.55 826,131 -28.27 0.0011
2026-02-12 2025-12-31 13F MASIMO COM 574795100 8,855,619 -1,505,472 -14.53 1,151,762 -24.66 0.0195
2025-11-12 2025-09-30 13F MASIMO COM 574795100 10,361,091 -146,235 -1.39 1,528,779 -13.51 0.0268
2025-08-12 2025-06-30 13F MASIMO COM 574795100 10,507,326 635,898 6.44 1,767,542 7.48 0.0336
2025-05-02 2025-03-31 13F MASIMO COM 574795100 9,871,428 1,173,215 13.49 1,644,580 14.38 0.0345
2025-02-07 2024-12-31 13F MASIMO COM 574795100 8,698,213 -124,056 -1.41 1,437,815 22.23 0.0291
2024-11-13 2024-09-30 13F MASIMO COM 574795100 8,822,269 -528,970 -5.66 1,176,273 -0.12 0.0247
2024-08-13 2024-06-30 13F MASIMO COM 574795100 9,351,239 1,470,865 18.66 1,177,695 1.77 0.0267
2024-05-10 2024-03-31 13F MASIMO COM 574795100 7,880,374 2,221,243 39.25 1,157,233 74.46 0.0269
2024-02-13 2023-12-31 13F MASIMO COM 574795100 5,659,131 246,798 4.56 663,307 39.77 0.0169
2023-11-13 2023-09-30 13F MASIMO COM 574795100 5,412,333 -707,790 -11.56 474,553 -52.88 0.0136
2023-08-11 2023-06-30 13F MASIMO COM 574795100 6,120,123 178,267 3.00 1,007,066 -8.16 0.0278
2023-05-12 2023-03-31 13F MASIMO COM 574795100 5,941,856 -15,092 -0.25 1,096,510 24.42 0.0323
2023-02-13 2022-12-31 13F MASIMO COM 574795100 5,956,948 542,124 10.01 881,330 15.30 0.0276
2022-11-14 2022-09-30 13F MASIMO COM 574795100 5,414,824 -360,404 -6.24 764,355 1.29 0.0260
2022-08-12 2022-06-30 13F MASIMO COM 574795100 5,775,228 -1,100,319 -16.00 754,648 -24.59 0.0242
2022-05-12 2022-03-31 13F MASIMO COM 574795100 6,875,547 -2,150,827 -23.83 1,000,668 -62.14 0.0270
2022-02-10 2021-12-31 13F MASIMO COM 574795100 9,026,374 133,072 1.50 2,642,740 9.77 0.0673
2021-11-09 2021-09-30 13F MASIMO COM 574795100 8,893,302 -24,811 -0.28 2,407,507 11.35 0.0674
2021-08-11 2021-06-30 13F MASIMO COM 574795100 8,918,113 763,064 9.36 2,162,196 15.45 0.0602
2021-05-07 2021-03-31 13F MASIMO COM 574795100 8,155,049 -161,475 -1.94 1,872,890 -16.09 0.0550
2021-02-05 2020-12-31 13F MASIMO COM 574795100 8,316,524 418,292 5.30 2,231,987 19.71 0.0712
2020-11-06 2020-09-30 13F MASIMO COM 574795100 7,898,232 458,222 6.16 1,864,456 9.92 0.0688
2020-08-14 2020-06-30 13F MASIMO COM 574795100 7,440,010 761,539 11.40 1,696,248 43.40 0.0677
2020-05-01 2020-03-31 13F MASIMO COM 574795100 6,678,471 133,750 2.04 1,182,890 14.35 0.0579
2020-02-13 2019-12-31 13F MASIMO COM 574795100 6,544,721 -339,810 -4.94 1,034,459 0.99 0.0397
2019-11-08 2019-09-30 13F MASIMO COM 574795100 6,884,531 -119,359 -1.70 1,024,348 -1.72 0.0430
2019-08-22 2019-06-30 13F/A-1 MASIMO COM 574795100 7,003,890 22,277 0.32 1,042,320 7.97 0.0446
2019-08-13 2019-06-30 13F MASIMO COM 574795100 7,003,890 22,277 1,042,320
2019-05-09 2019-03-31 13F MASIMO COM 574795100 6,981,613 -185,656 -2.59 965,417 25.45 0.0431
2019-02-08 2018-12-31 13F MASIMO COM 574795100 7,167,269 -1,144,631 -13.77 769,548 -25.66 0.0388
2018-11-09 2018-09-30 13F MASIMO COM 574795100 8,311,900 1,562,019 23.14 1,035,164 57.05 0.0448
2018-08-09 2018-06-30 13F MASIMO COM 574795100 6,749,881 -551,471 -7.55 659,127 2.64 0.0304
2018-05-09 2018-03-31 13F MASIMO COM 574795100 7,301,352 53,887 0.74 642,154 4.49 0.0307
2018-02-09 2017-12-31 13F MASIMO COM 574795100 7,247,465 -178,773 -2.41 614,586 -4.39 0.0292
2017-11-14 2017-09-30 13F MASIMO COM 574795100 7,426,238 -488,992 -6.18 642,815 -10.93 0.0324
2017-08-10 2017-06-30 13F MASIMO COM 574795100 7,915,230 550,995 7.48 721,710 5.08 0.0383
2017-05-12 2017-03-31 13F MASIMO COM 574795100 7,364,235 7,210,051 4,676.26 686,789 6,508.82 0.0377
2017-02-10 2016-12-31 13F MASIMO COM 574795100 154,184 -17,898 -10.40 10,392 1.51 0.0147
2016-11-08 2016-09-30 13F MASIMO COM 574795100 172,082 91,110 112.52 10,237 140.76 0.0147
2016-08-10 2016-06-30 13F MASIMO COM 574795100 80,972 43,976 118.87 4,252 174.68 0.0064
2016-05-10 2016-03-31 13F MASIMO COM 574795100 36,996 -15,771 -29.89 1,548 -29.32 0.0025
2016-02-11 2015-12-31 13F MASIMO COM 574795100 52,767 -82,723 -61.05 2,190 -58.09 0.0032
2015-11-13 2015-09-30 13F MASIMO COM 574795100 135,490 12,854 10.48 5,225 10.00 0.0082
2015-08-07 2015-06-30 13F MASIMO COM 574795100 122,636 -439 -0.36 4,750 17.05 0.0070
2015-05-13 2015-03-31 13F MASIMO COM 574795100 123,075 34,600 39.11 4,058 74.09 0.0056
2015-02-09 2014-12-31 13F MASIMO COM 574795100 88,475 31,200 54.47 2,331 91.38 0.0033
2014-10-29 2014-09-30 13F MASIMO COM 574795100 57,275 2,600 4.76 1,218 -5.65 0.0018
2014-08-06 2014-06-30 13F MASIMO COM 574795100 54,675 53,104 3,380.27 1,291 2,902.33 0.0019
2014-05-02 2014-03-31 13F MASIMO COM 574795100 1,571 -3,157 -66.77 43 -68.84 0.0001
2014-02-12 2013-12-31 13F MASIMO COM 574795100 4,728 -54 -1.13 138 8.66 0.0002
2013-11-12 2013-09-30 13F MASIMO COM 574795100 4,782 0 0.00 127 24.51 0.0002
2013-08-13 2013-06-30 13F MASIMO COM 574795100 4,782 4,782 102 0.0002
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.