Masimo Corp
MASIDelisted Jun 10, 2026- Industry
- Electromedical & Electrotherapeutic Apparatus
- SEC CIK
- 0000937556
Masimo Corp was delisted on Jun 10, 2026; its insiders filed their last Form 4 on Jun 12, 2026; 451 institutions reported holding it in 13F filings for Q1 2026, worth $9.69B in total; Soros Fund Management was the only superinvestor holding it.
13F holders, Q4 2025
Institutional positions in Masimo Corp as of Dec 31, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 392
- +37 vs. Q3 2025
- Shares held
- 55.4M
- −842.2K (−1.5%) vs. Q3 2025
- Total value
- $7.20B
- −$1.09B (−13.1%) vs. Q3 2025
- New holders
- 86
- 102 more added
- Sold out
- 49
- 132 more reduced
3 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting MASI on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 2 | $16.2K |
| Q1 2026 | 451 | $9.69B |
| Q4 2025 | 392 | $7.20B |
| Q3 2025 | 358 | $8.29B |
| Q2 2025 | 379 | $9.68B |
| Q1 2025 | 393 | $9.02B |
| Q4 2024 | 366 | $8.50B |
| Q3 2024 | 362 | $6.72B |
| Q2 2024 | 352 | $6.24B |
| Q1 2024 | 339 | $7.59B |
| Q4 2023 | 342 | $5.91B |
| Q3 2023 | 357 | $4.18B |
| Q2 2023 | 415 | $7.56B |
| Q1 2023 | 428 | $8.30B |
| Q4 2022 | 405 | $6.58B |
| Q3 2022 | 418 | $6.54B |
| Q2 2022 | 417 | $5.81B |
| Q1 2022 | 457 | $6.61B |
| Q4 2021 | 520 | $13.6B |
| Q3 2021 | 475 | $12.5B |
| Q2 2021 | 459 | $11.1B |
| Q1 2021 | 481 | $10.3B |
Institutions, Q4 2025
Shares, value and share of portfolio for each institution holding Masimo Corp; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BlackRock, Inc. | 8,855,619 | $1.15B | 0.02% | −1,505,472−14.5% | Reduced |
| FMR LLC | 7,864,164 | $1.02B | 0.05% | −349,557−4.3% | Reduced |
| Politan Capital Management LP | 4,589,648 | $596.9M | 71.01% | 00.0% | Unchanged |
| Vanguard Group Inc | 4,348,786 | $565.6M | 0.01% | −461,225−9.6% | Reduced |
| Massachusetts Financial Services Co | 2,663,875 | $346.5M | 0.11% | +43,915+1.7% | Added |
| T. Rowe Price Investment Management, Inc. | 2,330,158 | $303.1M | 0.19% | +203,395+9.6% | Added |
| Naya Capital Management UK Ltd | 1,560,697 | $203.0M | 15.28% | +1,560,697 | New |
| Westfield Capital Management Co LP | 1,522,049 | $198.0M | 0.82% | +102,799+7.2% | Added |
| State Street Corp | 1,415,196 | $184.1M | 0.01% | −69,275−4.7% | Reduced |
| Alyeska Investment Group, L.P. | 1,259,307 | $163.8M | 0.46% | −121,778−8.8% | Reduced |
| AQR Capital Management LLC | 1,091,326 | $141.9M | 0.07% | +1,060,292+3,416.5% | Added |
| Geode Capital Management, LLC | 953,976 | $124.1M | 0.01% | +11,537+1.2% | Added |
| Morgan Stanley | 920,735 | $119.8M | 0.01% | +230,134+33.3% | Added |
| RTW Investments, LP | 683,294 | $88.9M | 0.89% | 00.0% | Unchanged |
| Capital Research Global Investors | 637,894 | $83.0M | 0.02% | −1,216,234−65.6% | Reduced |
| Goldman Sachs Group Inc | 636,698 | $82.8M | 0.01% | −107,704−14.5% | Reduced |
| Liontrust Investment Partners LLP | 627,796 | $81.7M | 1.21% | −54,099−7.9% | Reduced |
| UBS Group AG | 599,274 | $77.9M | 0.02% | +429,474+252.9% | Added |
| Squarepoint Ops LLC | 583,747 | $75.9M | 0.15% | −37,185−6.0% | Reduced |
| Viking Global Investors LPSuperinvestorViking Global Investors | 514,340 | $66.9M | 0.18% | −559,093−52.1% | Reduced |
| Schroder Investment Management Group | 475,504 | $62.3M | 0.05% | +138,854+41.2% | Added |
| Ameriprise Financial Inc | 468,407 | $60.9M | 0.01% | +7,456+1.6% | Added |
| Northern Trust Corp | 380,464 | $49.5M | 0.01% | −11,678−3.0% | Reduced |
| Norges Bank | 377,421 | $49.1M | 0.01% | +377,421 | New |
| Bamco Inc | 373,899 | $48.6M | 0.13% | −14,848−3.8% | Reduced |
| Charles Schwab Investment Management Inc | 361,896 | $47.1M | 0.01% | −2,561−0.7% | Reduced |
| Gotham Asset Management, LLC | 342,194 | $44.5M | 0.16% | +213,168+165.2% | Added |
| CI Private Wealth, LLC | 340,230 | $44.3M | 0.06% | +4,015+1.2% | Added |
| Invesco Ltd. | 319,308 | $41.5M | 0.00% | −2,055−0.6% | Reduced |
| Bank of New York Mellon Corp | 308,485 | $40.1M | 0.01% | −4,133−1.3% | Reduced |
| Qube Research & Technologies Ltd | 293,536 | $38.2M | 0.05% | +293,536 | New |
| Bank of America Corp | 284,702 | $37.0M | 0.00% | −120,359−29.7% | Reduced |
| Schonfeld Strategic Advisors LLC | 265,036 | $34.5M | 0.17% | +254,152+2,335.1% | Added |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 232,565 | $30.2M | 0.03% | +67,639+41.0% | Added |
| Nuveen, LLC | 224,068 | $29.1M | 0.01% | −1,644−0.7% | Reduced |
| Marshall Wace, LLP | 219,312 | $28.5M | 0.03% | +85,190+63.5% | Added |
| Price T Rowe Associates Inc | 213,594 | $27.8M | 0.00% | −301,352−58.5% | Reduced |
| Erste Asset Management GmbH | 200,000 | $26.0M | 0.22% | +40,000+25.0% | Added |
| Parkman Healthcare Partners LLC | 200,000 | $26.0M | 2.48% | +200,000 | New |
| Millennium Management LLC | 187,965 | $24.4M | 0.02% | +171,834+1,065.2% | Added |
| Raymond James Financial Inc | 186,510 | $24.3M | 0.01% | −9,511−4.9% | Reduced |
| American Century Companies Inc | 178,758 | $23.2M | 0.01% | +10,417+6.2% | Added |
| Dimensional Fund Advisors LP | 173,950 | $22.6M | 0.00% | −85,718−33.0% | Reduced |
| Man Group plc | 147,416 | $19.2M | 0.04% | +147,416 | New |
| Grantham, Mayo, Van Otterloo & Co. LLC | 143,825 | $18.7M | 0.05% | −98,997−40.8% | Reduced |
| DF Dent & Co Inc | 142,626 | $18.6M | 0.27% | +33,973+31.3% | Added |
| Rhumbline Advisers | 124,556 | $16.2M | 0.01% | −2,052−1.6% | Reduced |
| Citigroup Inc | 121,231 | $15.8M | 0.01% | +4,559+3.9% | Added |
| GW&K Investment Management, LLC | 119,362 | $15.5M | 0.13% | −4,685−3.8% | Reduced |
| UBS Asset Management Americas Inc | 118,964 | $15.5M | 0.00% | +9,854+9.0% | Added |
| JPMorgan Chase & Co | 117,798 | $15.3M | 0.00% | +9,857+9.1% | Added |
| TD Asset Management Inc | 114,514 | $14.9M | 0.01% | +6,656+6.2% | Added |
| Jane Street Group, LLC | 102,881 | $13.4M | 0.02% | +102,881 | New |
| Principal Financial Group Inc | 97,858 | $12.7M | 0.01% | −4,326−4.2% | Reduced |
| Bellevue Group AG | 97,285 | $12.7M | 0.24% | +317+0.3% | Added |
| HRT Financial LP | 92,776 | $12.1M | 0.04% | +92,776 | New |
| Legal & General Group Plc | 92,436 | $12.0M | 0.00% | −10,241−10.0% | Reduced |
| Swiss National Bank | 91,100 | $11.8M | 0.01% | +1,800+2.0% | Added |
| Rockefeller Capital Management L.P. | 86,411 | $11.2M | 0.02% | −61,017−41.4% | Reduced |
| Toroso Investments, LLC | 85,294 | $11.1M | 0.05% | −47,263−35.7% | Reduced |
| Engineers Gate Manager LP | 83,458 | $10.9M | 0.13% | +52,685+171.2% | Added |
| Gamco Investors, Inc. Et Al | 83,000 | $10.8M | 0.10% | −800−1.0% | Reduced |
| Falcon Edge Capital, LP | 75,552 | $9.83M | 1.20% | −21,550−22.2% | Reduced |
| D. E. Shaw & Co., Inc. | 66,016 | $8.59M | 0.01% | +66,016 | New |
| California Public Employees Retirement System | 63,359 | $8.24M | 0.00% | −15,101−19.2% | Reduced |
| Renaissance Technologies LLC | 59,900 | $7.79M | 0.01% | +59,900 | New |
| Swedbank AB | 59,500 | $7.74M | 0.01% | −8,000−11.9% | Reduced |
| Barclays PLC | 58,358 | $7.59M | 0.00% | −19,446−25.0% | Reduced |
| Quantbot Technologies LP | 56,925 | $7.40M | 0.25% | +56,925 | New |
| Retirement Systems of Alabama | 54,795 | $7.13M | 0.02% | −1,036−1.9% | Reduced |
| Alliancebernstein L.P. | 54,223 | $7.05M | 0.00% | +662+1.2% | Added |
| Assenagon Asset Management S.A. | 53,525 | $6.96M | 0.01% | +51,068+2,078.5% | Added |
| Verition Fund Management LLC | 53,020 | $6.90M | 0.04% | +43,617+463.9% | Added |
| BLI - Banque de Luxembourg Investments | 48,839 | $6.40M | 0.19% | −19,661−28.7% | Reduced |
| Capital Fund Management S.A. | 47,586 | $6.19M | 0.06% | +13,162+38.2% | Added |
| Sofinnova Investments, Inc. | 46,201 | $6.01M | 0.26% | +46,201 | New |
| Amundi | 43,860 | $5.70M | 0.00% | −41,034−48.3% | Reduced |
| California State Teachers Retirement System | 43,823 | $5.70M | 0.01% | +468+1.1% | Added |
| Citadel Advisors LLC | 43,052 | $5.60M | 0.00% | −44,698−50.9% | Reduced |
| NS Partners Ltd | 42,348 | $5.51M | 0.22% | −46−0.1% | Reduced |
| Walleye Capital LLC | 42,049 | $5.47M | 0.03% | −47,314−52.9% | Reduced |
| New York State Teachers Retirement System | 40,048 | $5.21M | 0.01% | 00.0% | Unchanged |
| State Board of Administration of Florida Retirement System | 39,749 | $5.17M | 0.01% | −1,330−3.2% | Reduced |
| Voloridge Investment Management, LLC | 39,557 | $5.14M | 0.02% | +36,694+1,281.7% | Added |
| Wilson Asset Management (International) Pty Ltd | 39,437 | $5.13M | 1.32% | +12,203+44.8% | Added |
| Canada Pension Plan Investment Board | 38,500 | $5.01M | 0.00% | +22,700+143.7% | Added |
| STRS Ohio | 36,915 | $4.80M | 0.02% | +20.0% | Added |
| Manufacturers Life Insurance Company, The | 33,184 | $4.32M | 0.00% | −1,009−3.0% | Reduced |
| Gabelli Funds LLC | 32,700 | $4.25M | 0.03% | 00.0% | Unchanged |
| Baird Financial Group, Inc. | 30,679 | $3.99M | 0.01% | −5,155−14.4% | Reduced |
| Nordea Investment Management AB | 28,319 | $3.69M | 0.00% | −4,180−12.9% | Reduced |
| Campbell & CO Investment Adviser LLC | 27,783 | $3.61M | 0.17% | +27,783 | New |
| Storebrand Asset Management AS | 27,714 | $3.60M | 0.01% | −18−0.1% | Reduced |
| Great West Life Assurance Co | 26,610 | $3.46M | 0.01% | −510−1.9% | Reduced |
| Logan Capital Management Inc | 26,505 | $3.45M | 0.15% | +1,400+5.6% | Added |
| Gluskin Sheff & Assoc Inc | 25,805 | $3.36M | 0.47% | −2,118−7.6% | Reduced |
| Intech Investment Management LLC | 24,765 | $3.22M | 0.03% | −4,925−16.6% | Reduced |
| MetLife Investment Management | 24,472 | $3.18M | 0.02% | −1,377−5.3% | Reduced |
| Westmount Partners, LLC | 24,232 | $3.15M | 0.79% | −1,634−6.3% | Reduced |
| New York State Common Retirement Fund | 24,160 | $3.14M | 0.00% | 00.0% | Unchanged |