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 |
|---|---|---|---|---|---|
| Campbell & CO Investment Adviser LLC | 27,783 | $3.61M | 0.17% | +27,783 | New |
| Nordea Investment Management AB | 28,319 | $3.69M | 0.00% | −4,180−12.9% | Reduced |
| Baird Financial Group, Inc. | 30,679 | $3.99M | 0.01% | −5,155−14.4% | Reduced |
| Gabelli Funds LLC | 32,700 | $4.25M | 0.03% | 00.0% | Unchanged |
| Manufacturers Life Insurance Company, The | 33,184 | $4.32M | 0.00% | −1,009−3.0% | Reduced |
| STRS Ohio | 36,915 | $4.80M | 0.02% | +20.0% | Added |
| Canada Pension Plan Investment Board | 38,500 | $5.01M | 0.00% | +22,700+143.7% | Added |
| Wilson Asset Management (International) Pty Ltd | 39,437 | $5.13M | 1.32% | +12,203+44.8% | Added |
| Voloridge Investment Management, LLC | 39,557 | $5.14M | 0.02% | +36,694+1,281.7% | Added |
| State Board of Administration of Florida Retirement System | 39,749 | $5.17M | 0.01% | −1,330−3.2% | Reduced |
| New York State Teachers Retirement System | 40,048 | $5.21M | 0.01% | 00.0% | Unchanged |
| Walleye Capital LLC | 42,049 | $5.47M | 0.03% | −47,314−52.9% | Reduced |
| NS Partners Ltd | 42,348 | $5.51M | 0.22% | −46−0.1% | Reduced |
| Citadel Advisors LLC | 43,052 | $5.60M | 0.00% | −44,698−50.9% | Reduced |
| California State Teachers Retirement System | 43,823 | $5.70M | 0.01% | +468+1.1% | Added |
| Amundi | 43,860 | $5.70M | 0.00% | −41,034−48.3% | Reduced |
| Sofinnova Investments, Inc. | 46,201 | $6.01M | 0.26% | +46,201 | New |
| Capital Fund Management S.A. | 47,586 | $6.19M | 0.06% | +13,162+38.2% | Added |
| BLI - Banque de Luxembourg Investments | 48,839 | $6.40M | 0.19% | −19,661−28.7% | Reduced |
| Verition Fund Management LLC | 53,020 | $6.90M | 0.04% | +43,617+463.9% | Added |
| Assenagon Asset Management S.A. | 53,525 | $6.96M | 0.01% | +51,068+2,078.5% | Added |
| Alliancebernstein L.P. | 54,223 | $7.05M | 0.00% | +662+1.2% | Added |
| Retirement Systems of Alabama | 54,795 | $7.13M | 0.02% | −1,036−1.9% | Reduced |
| Quantbot Technologies LP | 56,925 | $7.40M | 0.25% | +56,925 | New |
| Barclays PLC | 58,358 | $7.59M | 0.00% | −19,446−25.0% | Reduced |
| Swedbank AB | 59,500 | $7.74M | 0.01% | −8,000−11.9% | Reduced |
| Renaissance Technologies LLC | 59,900 | $7.79M | 0.01% | +59,900 | New |
| California Public Employees Retirement System | 63,359 | $8.24M | 0.00% | −15,101−19.2% | Reduced |
| D. E. Shaw & Co., Inc. | 66,016 | $8.59M | 0.01% | +66,016 | New |
| Falcon Edge Capital, LP | 75,552 | $9.83M | 1.20% | −21,550−22.2% | Reduced |
| Gamco Investors, Inc. Et Al | 83,000 | $10.8M | 0.10% | −800−1.0% | Reduced |
| Engineers Gate Manager LP | 83,458 | $10.9M | 0.13% | +52,685+171.2% | Added |
| Toroso Investments, LLC | 85,294 | $11.1M | 0.05% | −47,263−35.7% | Reduced |
| Rockefeller Capital Management L.P. | 86,411 | $11.2M | 0.02% | −61,017−41.4% | Reduced |
| Swiss National Bank | 91,100 | $11.8M | 0.01% | +1,800+2.0% | Added |
| Legal & General Group Plc | 92,436 | $12.0M | 0.00% | −10,241−10.0% | Reduced |
| HRT Financial LP | 92,776 | $12.1M | 0.04% | +92,776 | New |
| Bellevue Group AG | 97,285 | $12.7M | 0.24% | +317+0.3% | Added |
| Principal Financial Group Inc | 97,858 | $12.7M | 0.01% | −4,326−4.2% | Reduced |
| Jane Street Group, LLC | 102,881 | $13.4M | 0.02% | +102,881 | New |
| TD Asset Management Inc | 114,514 | $14.9M | 0.01% | +6,656+6.2% | Added |
| JPMorgan Chase & Co | 117,798 | $15.3M | 0.00% | +9,857+9.1% | Added |
| UBS Asset Management Americas Inc | 118,964 | $15.5M | 0.00% | +9,854+9.0% | Added |
| GW&K Investment Management, LLC | 119,362 | $15.5M | 0.13% | −4,685−3.8% | Reduced |
| Citigroup Inc | 121,231 | $15.8M | 0.01% | +4,559+3.9% | Added |
| Rhumbline Advisers | 124,556 | $16.2M | 0.01% | −2,052−1.6% | Reduced |
| DF Dent & Co Inc | 142,626 | $18.6M | 0.27% | +33,973+31.3% | Added |
| Grantham, Mayo, Van Otterloo & Co. LLC | 143,825 | $18.7M | 0.05% | −98,997−40.8% | Reduced |
| Man Group plc | 147,416 | $19.2M | 0.04% | +147,416 | New |
| Dimensional Fund Advisors LP | 173,950 | $22.6M | 0.00% | −85,718−33.0% | Reduced |
| American Century Companies Inc | 178,758 | $23.2M | 0.01% | +10,417+6.2% | Added |
| Raymond James Financial Inc | 186,510 | $24.3M | 0.01% | −9,511−4.9% | Reduced |
| Millennium Management LLC | 187,965 | $24.4M | 0.02% | +171,834+1,065.2% | Added |
| 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 |
| Price T Rowe Associates Inc | 213,594 | $27.8M | 0.00% | −301,352−58.5% | Reduced |
| Marshall Wace, LLP | 219,312 | $28.5M | 0.03% | +85,190+63.5% | Added |
| Nuveen, LLC | 224,068 | $29.1M | 0.01% | −1,644−0.7% | Reduced |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 232,565 | $30.2M | 0.03% | +67,639+41.0% | Added |
| Schonfeld Strategic Advisors LLC | 265,036 | $34.5M | 0.17% | +254,152+2,335.1% | Added |
| Bank of America Corp | 284,702 | $37.0M | 0.00% | −120,359−29.7% | Reduced |
| Qube Research & Technologies Ltd | 293,536 | $38.2M | 0.05% | +293,536 | New |
| Bank of New York Mellon Corp | 308,485 | $40.1M | 0.01% | −4,133−1.3% | Reduced |
| Invesco Ltd. | 319,308 | $41.5M | 0.00% | −2,055−0.6% | Reduced |
| CI Private Wealth, LLC | 340,230 | $44.3M | 0.06% | +4,015+1.2% | Added |
| Gotham Asset Management, LLC | 342,194 | $44.5M | 0.16% | +213,168+165.2% | Added |
| Charles Schwab Investment Management Inc | 361,896 | $47.1M | 0.01% | −2,561−0.7% | Reduced |
| Bamco Inc | 373,899 | $48.6M | 0.13% | −14,848−3.8% | Reduced |
| Norges Bank | 377,421 | $49.1M | 0.01% | +377,421 | New |
| Northern Trust Corp | 380,464 | $49.5M | 0.01% | −11,678−3.0% | Reduced |
| Ameriprise Financial Inc | 468,407 | $60.9M | 0.01% | +7,456+1.6% | Added |
| Schroder Investment Management Group | 475,504 | $62.3M | 0.05% | +138,854+41.2% | Added |
| Viking Global Investors LPSuperinvestorViking Global Investors | 514,340 | $66.9M | 0.18% | −559,093−52.1% | Reduced |
| Squarepoint Ops LLC | 583,747 | $75.9M | 0.15% | −37,185−6.0% | Reduced |
| UBS Group AG | 599,274 | $77.9M | 0.02% | +429,474+252.9% | Added |
| Liontrust Investment Partners LLP | 627,796 | $81.7M | 1.21% | −54,099−7.9% | Reduced |
| Goldman Sachs Group Inc | 636,698 | $82.8M | 0.01% | −107,704−14.5% | Reduced |
| Capital Research Global Investors | 637,894 | $83.0M | 0.02% | −1,216,234−65.6% | Reduced |
| RTW Investments, LP | 683,294 | $88.9M | 0.89% | 00.0% | Unchanged |
| Morgan Stanley | 920,735 | $119.8M | 0.01% | +230,134+33.3% | Added |
| Geode Capital Management, LLC | 953,976 | $124.1M | 0.01% | +11,537+1.2% | Added |
| AQR Capital Management LLC | 1,091,326 | $141.9M | 0.07% | +1,060,292+3,416.5% | Added |
| Alyeska Investment Group, L.P. | 1,259,307 | $163.8M | 0.46% | −121,778−8.8% | Reduced |
| State Street Corp | 1,415,196 | $184.1M | 0.01% | −69,275−4.7% | Reduced |
| Westfield Capital Management Co LP | 1,522,049 | $198.0M | 0.82% | +102,799+7.2% | Added |
| Naya Capital Management UK Ltd | 1,560,697 | $203.0M | 15.28% | +1,560,697 | New |
| T. Rowe Price Investment Management, Inc. | 2,330,158 | $303.1M | 0.19% | +203,395+9.6% | Added |
| Massachusetts Financial Services Co | 2,663,875 | $346.5M | 0.11% | +43,915+1.7% | Added |
| Vanguard Group Inc | 4,348,786 | $565.6M | 0.01% | −461,225−9.6% | Reduced |
| Politan Capital Management LP | 4,589,648 | $596.9M | 71.01% | 00.0% | Unchanged |
| FMR LLC | 7,864,164 | $1.02B | 0.05% | −349,557−4.3% | Reduced |
| BlackRock, Inc. | 8,855,619 | $1.15B | 0.02% | −1,505,472−14.5% | Reduced |
| Durable Capital Partners LP | 0 | $0 | 0.00% | −620,619−100.0% | Sold out |
| Adage Capital Partners GP, L.L.C. | 0 | $0 | 0.00% | −150,000−100.0% | Sold out |
| Cramer Rosenthal McGlynn LLC | 0 | $0 | 0.00% | −114,605−100.0% | Sold out |
| Jupiter Asset Management Ltd | 0 | $0 | 0.00% | −84,657−100.0% | Sold out |
| Bridger Management, LLC | 0 | $0 | 0.00% | −47,841−100.0% | Sold out |
| ING Groep NV | 0 | $0 | 0.00% | −20,800−100.0% | Sold out |
| Entropy Technologies, LP | 0 | $0 | 0.00% | −16,809−100.0% | Sold out |
| Landscape Capital Management, L.L.C. | 0 | $0 | 0.00% | −15,292−100.0% | Sold out |