| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| FMR LLC | 15% | $1,315,009,580 | 8,031,083 | FMR LLC | 31 Dec 2024 | |||
| KIANI JOE E | 10% | -7.3% | $767,956,048 | -$61,400,155 | 5,904,629 | -7.4% | Joe Kiani | 31 Dec 2025 |
| Politan Capital Management LP | 6.2% | $671,231,541 | 4,590,873 | Quentin Koffey | 16 Feb 2026 | |||
| BlackRock Portfolio Management LLC | 8.2% | -21% | $570,482,438 | -$149,630,388 | 4,386,302 | -21% | BlackRock Portfolio Management LLC | 31 Dec 2025 |
| BlackRock, Inc. | 7.9% | $692,807,191 | 4,231,142 | BlackRock, Inc. | 31 Jan 2025 |
As of 31 Dec 2025, 382 institutional investors reported holding 55,311,796 shares of MASIMO CORP - Common Stock, par value $0.001 per share (MASI). This represents 75% of the company’s total 74,046,339 outstanding shares.
The largest institutional shareholders of MASIMO CORP - Common Stock, par value $0.001 per share (MASI) together control 62% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 12% | 8,855,619 | -15% | 0.02% | $1,151,761,872 |
| FMR LLC | 11% | 7,864,164 | -4.3% | 0.05% | $1,022,813,172 |
| Politan Capital Management LP | 6.2% | 4,589,648 | 0% | 71% | $596,929,619 |
| VANGUARD GROUP INC | 5.9% | 4,348,786 | -9.6% | 0.01% | $565,603,107 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 3.6% | 2,663,875 | +1.7% | 0.11% | $346,463,583 |
| T. Rowe Price Investment Management, Inc. | 3.1% | 2,330,158 | +9.6% | 0.19% | $303,061,000 |
| NAYA CAPITAL MANAGEMENT UK LTD | 2.1% | 1,560,697 | 15% | $202,984,252 | |
| WESTFIELD CAPITAL MANAGEMENT CO LP | 2.1% | 1,522,049 | +7.2% | 0.82% | $197,957,646 |
| STATE STREET CORP | 1.9% | 1,415,196 | -4.7% | 0.01% | $184,060,392 |
| Alyeska Investment Group, L.P. | 1.7% | 1,259,307 | -8.8% | 0.46% | $163,785,468 |
| AQR CAPITAL MANAGEMENT LLC | 1.5% | 1,091,326 | +3417% | 0.07% | $141,937,886 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.3% | 953,976 | +1.2% | 0.01% | $124,096,067 |
| MORGAN STANLEY | 1.2% | 920,735 | +33% | 0.01% | $119,751,047 |
| RTW INVESTMENTS, LP | 0.92% | 683,294 | 0% | 0.89% | $88,869,218 |
| Capital Research Global Investors | 0.86% | 637,894 | -66% | 0.02% | $82,964,494 |
| GOLDMAN SACHS GROUP INC | 0.86% | 636,698 | -14% | 0.01% | $82,808,942 |
| Liontrust Investment Partners LLP | 0.85% | 627,796 | -7.9% | 1.2% | $81,651,148 |
| UBS Group AG | 0.81% | 599,274 | +253% | 0.02% | $77,941,576 |
| Squarepoint Ops LLC | 0.79% | 583,747 | -6% | 0.15% | $75,922,135 |
| VIKING GLOBAL INVESTORS LP | 0.69% | 514,340 | -52% | 0.18% | $66,895,060 |
| SCHRODER INVESTMENT MANAGEMENT GROUP | 0.64% | 475,504 | +41% | 0.05% | $62,324,309 |
| AMERIPRISE FINANCIAL INC | 0.63% | 468,407 | +1.6% | 0.01% | $60,921,015 |
| NORTHERN TRUST CORP | 0.51% | 380,464 | -3% | 0.01% | $49,483,147 |
| NORGES BANK | 0.51% | 377,421 | 0.01% | $49,087,375 | |
| BAMCO INC /NY/ | 0.5% | 373,899 | -3.8% | 0.13% | $48,629,304 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 55,311,796 | $7,194,847,309 | -$129,915,636 | $130.06 | 382 |
| 2025 Q3 | 56,175,682 | $8,285,636,420 | -$242,029,720 | $147.55 | 354 |
| 2025 Q2 | 57,531,263 | $9,678,040,277 | +$566,298,917 | $168.22 | 375 |
| 2025 Q1 | 54,245,883 | $9,034,866,757 | +$448,557,462 | $166.60 | 389 |
| 2024 Q4 | 51,411,548 | $8,501,447,911 | +$221,294,182 | $165.30 | 362 |
| 2024 Q3 | 50,430,653 | $6,717,968,664 | +$195,557,848 | $133.33 | 357 |
| 2024 Q2 | 49,545,428 | $6,238,873,009 | -$289,595,358 | $125.94 | 350 |
| 2024 Q1 | 51,603,603 | $7,578,656,800 | +$54,858,314 | $146.85 | 330 |
| 2023 Q4 | 50,338,512 | $5,900,007,837 | +$429,947,280 | $117.21 | 333 |
| 2023 Q3 | 47,611,421 | $4,174,934,463 | -$49,427,852 | $87.68 | 349 |
| 2023 Q2 | 45,905,078 | $7,556,450,399 | +$147,455,979 | $164.55 | 406 |
| 2023 Q1 | 44,980,748 | $8,299,415,764 | +$131,407,346 | $184.54 | 422 |
| 2022 Q4 | 44,446,198 | $6,576,885,382 | -$261,109,381 | $147.95 | 399 |
| 2022 Q3 | 46,357,468 | $6,545,831,305 | +$305,043,460 | $141.16 | 405 |
| 2022 Q2 | 44,331,887 | $5,805,221,289 | -$135,171,216 | $130.67 | 394 |
| 2022 Q1 | 45,258,877 | $6,588,554,196 | -$700,651,716 | $145.54 | 435 |
| 2021 Q4 | 46,324,863 | $13,546,650,154 | -$6,634,536 | $292.78 | 502 |
| 2021 Q3 | 46,260,495 | $12,512,067,827 | +$159,621,988 | $270.71 | 457 |
| 2021 Q2 | 45,755,768 | $11,088,901,374 | +$303,542,126 | $242.45 | 447 |
| 2021 Q1 | 45,034,445 | $10,334,233,469 | -$154,653,705 | $229.66 | 469 |
| 2020 Q4 | 46,134,675 | $12,367,769,029 | +$118,456,546 | $268.38 | 480 |
| 2020 Q3 | 45,513,746 | $10,736,770,297 | -$426,567 | $236.06 | 449 |
| 2020 Q2 | 45,565,863 | $10,382,684,886 | -$45,339,410 | $227.99 | 467 |
| 2020 Q1 | 45,927,274 | $8,139,877,716 | +$51,831,017 | $177.12 | 394 |
| 2019 Q4 | 44,938,202 | $7,100,269,622 | +$134,499,433 | $158.06 | 376 |
| 2019 Q3 | 44,078,987 | $6,554,014,971 | -$26,539,658 | $148.79 | 387 |
| 2019 Q2 | 44,253,000 | $6,579,080,937 | +$87,334,220 | $148.82 | 380 |
| 2019 Q1 | 44,448,873 | $6,143,880,819 | +$95,355,328 | $138.28 | 397 |
| 2018 Q4 | 43,916,003 | $4,715,440,176 | +$4,670,131 | $107.37 | 362 |
| 2018 Q3 | 43,758,851 | $5,449,391,811 | +$30,553,990 | $124.54 | 347 |
| 2018 Q2 | 43,689,354 | $4,266,798,989 | +$9,236,648 | $97.65 | 334 |
| 2018 Q1 | 43,588,229 | $3,833,601,534 | +$188,073,886 | $87.95 | 319 |
| 2017 Q4 | 43,928,863 | $3,723,381,823 | -$101,698,184 | $84.80 | 333 |
| 2017 Q3 | 43,964,692 | $3,803,529,775 | -$1,695,010 | $86.56 | 316 |
| 2017 Q2 | 43,952,421 | $4,007,992,911 | +$119,093,443 | $91.18 | 330 |
| 2017 Q1 | 42,650,521 | $3,978,048,815 | +$842,907,910 | $93.26 | 363 |
| 2016 Q4 | 40,449,406 | $2,726,201,878 | -$2,875,693 | $67.40 | 308 |
| 2016 Q3 | 40,553,020 | $2,411,634,707 | +$66,436,055 | $59.49 | 290 |
| 2016 Q2 | 39,482,461 | $2,073,623,320 | +$7,155,965 | $52.51 | 261 |
| 2016 Q1 | 39,653,579 | $1,658,291,704 | -$7,451,543 | $41.84 | 223 |
| 2015 Q4 | 39,855,135 | $1,654,226,332 | -$19,334,090 | $41.51 | 234 |
| 2015 Q3 | 40,350,761 | $1,555,877,307 | -$10,152,670 | $38.56 | 216 |
| 2015 Q2 | 40,873,752 | $1,583,092,408 | -$59,576,606 | $38.74 | 198 |
| 2015 Q1 | 42,183,688 | $1,389,342,995 | +$18,569,076 | $32.98 | 174 |
| 2014 Q4 | 42,045,270 | $1,107,548,336 | -$9,241,122 | $26.34 | 177 |
| 2014 Q3 | 43,030,779 | $915,663,226 | -$56,283,952 | $21.28 | 166 |
| 2014 Q2 | 45,421,118 | $1,071,924,710 | -$84,818,879 | $23.60 | 176 |
| 2014 Q1 | 48,536,107 | $1,325,418,870 | +$23,725,182 | $27.31 | 168 |