Latest Period
Q4 2025
Security Snapshot
MASIMO CORP - Common Stock (MASI) Institutional Ownership
CUSIP: 574795100
13F Institutional Holders and Ownership History from Q1 2014 to Q1 2026
Institutions Reporting
388
Shares (Excl. Options)
55,327,406
Price
$130.06
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- Type / Class
- Equity / Common Stock
- Symbol
- MASI on Nasdaq
- Shares outstanding
- 52,221,656
- Price per share
- $178.47
- All holders as of 31 Dec 2025
- Q4 2025
- Total 13F shares
- 55,327,406
- Total reported value
- $7,196,877,546
- % of total 13F portfolios
- 0%
- Share change
- -844,710
- Value change
- -$130,519,661
- Number of holders
- 388
- Price from insider filings
- $178.47
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- MASI - MASIMO CORP - Common Stock is tracked under CUSIP 574795100.
- 388 institutions reported positions in Q4 2025.
- 5 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 388 to 112 between Q4 2025 and Q1 2026.
- Reported value moved from $7,196,877,546 to $344,242,857.
Why This Matters
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 388 institutions filings for Q4 2025.
Investment Quick Answers
What is CUSIP 574795100?
CUSIP 574795100 identifies MASI - MASIMO CORP - Common Stock in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 574795100:
Significant Owners of MASIMO CORP - Common Stock (MASI) based on Schedule 13D/G filings
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| 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, Inc. | 7.9% | $692,807,191 | 4,231,142 | BlackRock, Inc. | 31 Jan 2025 | |||
| FMR LLC | 4.5% | -70% | $317,340,559 | -$767,176,959 | 2,349,975 | -71% | FMR LLC | 27 Feb 2026 |
| BlackRock Portfolio Management LLC | 0.2% | -100% | $20,787,845 | -$759,403,692 | 116,871 | -97% | BlackRock Portfolio Management LLC | 31 Mar 2026 |
As of 31 Dec 2025, 388 institutional investors reported holding 55,327,406 shares of MASIMO CORP - Common Stock (MASI). This represents 106% of the company’s total 52,221,656 outstanding shares.
Top 25 Institutional Shareholders
The largest institutional shareholders of MASIMO CORP - Common Stock (MASI) together control 88% 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. | 17% | 8,855,619 | -15% | 0.02% | $1,151,761,872 |
| FMR LLC | 15% | 7,864,164 | -4.3% | 0.05% | $1,022,813,172 |
| Politan Capital Management LP | 8.8% | 4,589,648 | 0% | 71% | $596,929,619 |
| VANGUARD GROUP INC | 8.3% | 4,348,786 | -9.6% | 0.01% | $565,603,107 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 5.1% | 2,663,875 | +1.7% | 0.11% | $346,463,583 |
| T. Rowe Price Investment Management, Inc. | 4.5% | 2,330,158 | +9.6% | 0.19% | $303,061,000 |
| NAYA CAPITAL MANAGEMENT UK LTD | 3% | 1,560,697 | 15% | $202,984,252 | |
| WESTFIELD CAPITAL MANAGEMENT CO LP | 2.9% | 1,522,049 | +7.2% | 0.82% | $197,957,646 |
| STATE STREET CORP | 2.7% | 1,415,196 | -4.7% | 0.01% | $184,060,392 |
| Alyeska Investment Group, L.P. | 2.4% | 1,259,307 | -8.8% | 0.46% | $163,785,468 |
| AQR CAPITAL MANAGEMENT LLC | 2.1% | 1,091,326 | +3417% | 0.07% | $141,937,886 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.8% | 953,976 | +1.2% | 0.01% | $124,096,067 |
| MORGAN STANLEY | 1.8% | 920,735 | +33% | 0.01% | $119,751,047 |
| RTW INVESTMENTS, LP | 1.3% | 683,294 | 0% | 0.89% | $88,869,218 |
| Capital Research Global Investors | 1.2% | 637,894 | -66% | 0.02% | $82,964,494 |
| GOLDMAN SACHS GROUP INC | 1.2% | 636,698 | -14% | 0.01% | $82,808,942 |
| Liontrust Investment Partners LLP | 1.2% | 627,796 | -7.9% | 1.2% | $81,651,148 |
| UBS Group AG | 1.1% | 599,274 | +253% | 0.02% | $77,941,576 |
| Squarepoint Ops LLC | 1.1% | 583,747 | -6% | 0.15% | $75,922,135 |
| VIKING GLOBAL INVESTORS LP | 0.98% | 514,340 | -52% | 0.18% | $66,895,060 |
| SCHRODER INVESTMENT MANAGEMENT GROUP | 0.91% | 475,504 | +41% | 0.05% | $62,324,309 |
| AMERIPRISE FINANCIAL INC | 0.9% | 468,407 | +1.6% | 0.01% | $60,921,015 |
| NORTHERN TRUST CORP | 0.73% | 380,464 | -3% | 0.01% | $49,483,147 |
| NORGES BANK | 0.72% | 377,421 | 0.01% | $49,087,375 | |
| BAMCO INC /NY/ | 0.72% | 373,899 | -3.8% | 0.13% | $48,629,304 |
Institutional Holders of MASIMO CORP - Common Stock (MASI) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 1,937,489 | $344,242,857 | +$205,583,675 | $177.87 | 112 |
| 2025 Q4 | 55,327,406 | $7,196,877,546 | -$130,519,661 | $130.06 | 388 |
| 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 |