MASIMO CORP (MASI)
Institutional ownership reported to the SEC as of Q2 2026, across 31 quarters.
4
Reporting holders
$2.4M
Reported value
0.0%
Held as options
-424
Holder change
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| Louisiana State Employees Retirement System | $2.3M | 13,200 | 0.02% | 31q | HELD |
| IFP Advisors, Inc | $15.8K | 88 | 0.00% | 11q | -87.7%-$113.2K |
| HUNTINGTON NATIONAL BANK | $360 | 2 | 0.00% | 15q | -99.9%-$404.8K |
| MV CAPITAL MANAGEMENT, INC. | $356 | 2 | 0.00% | 2q | HELD |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-08-14 | 13G/A | Pentwater Capital Management LPwith 1 co-filers | 0.0% |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 4 | $2.4M | 13,292 | 0 | 0 | 2 | 0.0% |
| Q1 2026 | 428 | $9.7B | 53,238,059 | 128 | 125 | 96 | 3.1% |
| Q4 2025 | 363 | $6.8B | 52,470,809 | 70 | 92 | 119 | 0.2% |
| Q3 2025 | 330 | $7.8B | 53,134,964 | 45 | 101 | 107 | 0.1% |
| Q2 2025 | 344 | $9.2B | 54,343,945 | 41 | 107 | 119 | 0.1% |
| Q1 2025 | 357 | $8.7B | 51,900,163 | 62 | 112 | 96 | 0.1% |
| Q4 2024 | 332 | $8.2B | 49,185,699 | 40 | 102 | 100 | 0.4% |
| Q3 2024 | 329 | $6.6B | 48,667,717 | 54 | 91 | 109 | 2.3% |
| Q2 2024 | 322 | $6.0B | 46,748,979 | 47 | 106 | 85 | 1.3% |
| Q1 2024 | 312 | $7.5B | 50,541,018 | 44 | 77 | 107 | 0.9% |
| Q4 2023 | 303 | $5.8B | 47,921,736 | 42 | 96 | 102 | 2.9% |
| Q3 2023 | 311 | $4.2B | 45,454,087 | 56 | 68 | 132 | 6.0% |
| Q2 2023 | 352 | $7.3B | 44,314,433 | 41 | 92 | 130 | 0.5% |
| Q1 2023 | 360 | $9.0B | 48,677,964 | 66 | 91 | 114 | 0.5% |
| Q4 2022 | 315 | $6.0B | 40,680,810 | 37 | 82 | 130 | 0.3% |
| Q3 2022 | 414 | $6.6B | 46,357,875 | 56 | 101 | 177 | 0.3% |
| Q2 2022 | 406 | $5.8B | 44,326,474 | 45 | 143 | 154 | 0.4% |
| Q1 2022 | 449 | $6.7B | 45,927,565 | 67 | 173 | 133 | 0.6% |
| Q4 2021 | 517 | $13.7B | 46,411,233 | 63 | 171 | 145 | 0.6% |
| Q3 2021 | 474 | $12.6B | 46,262,759 | 53 | 136 | 154 | 0.6% |
| Q2 2021 | 460 | $11.2B | 45,840,268 | 41 | 155 | 165 | 1.0% |
| Q1 2021 | 482 | $10.4B | 45,061,897 | 53 | 179 | 152 | 0.7% |
| Q4 2020 | 492 | $12.5B | 46,395,379 | 60 | 174 | 130 | 0.6% |
| Q3 2020 | 463 | $10.8B | 45,519,957 | 54 | 152 | 162 | 1.0% |
| Q2 2020 | 476 | $10.6B | 45,929,267 | 126 | 148 | 144 | 1.1% |
| Q1 2020 | 400 | $8.4B | 47,080,769 | 60 | 110 | 156 | 0.4% |
| Q4 2019 | 381 | $7.3B | 45,946,240 | 33 | 108 | 136 | 0.2% |
| Q3 2019 | 392 | $6.7B | 44,725,456 | 46 | 103 | 161 | 0.2% |
| Q2 2019 | 387 | $6.7B | 44,923,526 | 48 | 119 | 132 | 0.6% |
| Q1 2019 | 406 | $6.3B | 45,278,055 | 65 | 133 | 129 | 0.6% |
| Q4 2018 | 368 | $4.9B | 45,111,073 | 6 | 9 | 10 | 0.3% |