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, Q1 2026
Institutional positions in Masimo Corp as of Mar 31, 2026. 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
MASI is no longer listed, so this page shows Q1 2026. 13F filings for later quarters list far fewer holders.
- Institutional holders
- 451
- +65 vs. Q4 2025
- Shares held
- 54.6M
- +4.00M (+7.9%) vs. Q4 2025
- Total value
- $9.69B
- +$3.10B (+47.2%) vs. Q4 2025
- New holders
- 136
- 140 more added
- Sold out
- 71
- 107 more reduced
6 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 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, Q1 2026
Shares, value and share of portfolio for each institution holding Masimo Corp; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Picton Mahoney Asset Management | 65,000 | $11.6M | 0.12% | +54,500+519.0% | Added |
| Carmignac Gestion | 64,831 | $11.5M | 0.18% | +64,831 | New |
| Wilson Asset Management (International) Pty Ltd | 63,984 | $11.4M | 3.21% | +24,547+62.2% | Added |
| Legal & General Group Plc | 62,545 | $11.1M | 0.00% | −29,891−32.3% | Reduced |
| Mariner, LLC | 61,265 | $10.9M | 0.01% | +39,816+185.6% | Added |
| Retirement Systems of Alabama | 55,974 | $9.96M | 0.03% | +1,179+2.2% | Added |
| California State Teachers Retirement System | 53,287 | $9.48M | 0.01% | +9,464+21.6% | Added |
| Toroso Investments, LLC | 49,720 | $8.84M | 0.03% | −35,574−41.7% | Reduced |
| Caxton Associates LLP | 45,917 | $8.17M | 0.19% | +45,917 | New |
| Price T Rowe Associates Inc | 45,830 | $8.15M | 0.00% | −167,764−78.5% | Reduced |
| Lighthouse Investment Partners, LLC | 42,851 | $7.62M | 0.29% | +42,851 | New |
| NS Partners Ltd | 42,004 | $7.47M | 0.33% | −344−0.8% | Reduced |
| Vanguard Asset Management, Ltd | 40,876 | $7.27M | 0.01% | +40,876 | New |
| State Board of Administration of Florida Retirement System | 39,654 | $7.05M | 0.01% | −95−0.2% | Reduced |
| Cerity Partners LLC | 38,820 | $6.90M | 0.01% | +15,046+63.3% | Added |
| New York State Teachers Retirement System | 38,569 | $6.86M | 0.01% | −1,479−3.7% | Reduced |
| STRS Ohio | 37,213 | $6.62M | 0.03% | +298+0.8% | Added |
| Thrivent Financial for Lutherans | 36,420 | $6.48M | 0.01% | +13,246+57.2% | Added |
| Fortress Investment Group LLC | 35,900 | $6.39M | 1.63% | +35,900 | New |
| BLI - Banque de Luxembourg Investments | 48,839 | $6.30M | 0.19% | 00.0% | Unchanged |
| CWM, LLC | 34,690 | $6.17M | 0.02% | +16,155+87.2% | Added |
| Alberta Investment Management Corp | 34,107 | $6.07M | 0.04% | +34,107 | New |
| Ieq Capital, LLC | 32,217 | $5.73M | 0.03% | +32,217 | New |
| Groupe la Francaise | 31,950 | $5.68M | 0.08% | +31,950 | New |
| Engineers Gate Manager LP | 30,423 | $5.41M | 0.07% | −53,035−63.5% | Reduced |
| Taconic Capital Advisors LP | 30,000 | $5.34M | 3.65% | +30,000 | New |
| Vestcor Inc | 30,000 | $5.34M | 0.15% | +26,175+684.3% | Added |
| Tokio Marine Asset Management Co Ltd | 29,400 | $5.23M | 0.19% | +29,400 | New |
| Storebrand Asset Management AS | 27,714 | $4.93M | 0.01% | 00.0% | Unchanged |
| Quantbot Technologies LP | 27,425 | $4.88M | 0.20% | −29,500−51.8% | Reduced |
| Great West Life Assurance Co | 26,443 | $4.71M | 0.01% | −167−0.6% | Reduced |
| Natixis | 25,495 | $4.53M | 0.02% | +23,209+1,015.3% | Added |
| TPG GP A, LLC | 25,000 | $4.45M | 0.12% | +25,000 | New |
| MetLife Investment Management | 24,485 | $4.36M | 0.02% | +13+0.1% | Added |
| Westmount Partners, LLC | 24,232 | $4.31M | 1.06% | 00.0% | Unchanged |
| New York State Common Retirement Fund | 24,160 | $4.30M | 0.01% | 00.0% | Unchanged |
| Centiva Capital, LP | 23,713 | $4.22M | 0.20% | +23,713 | New |
| Manufacturers Life Insurance Company, The | 23,637 | $4.20M | 0.00% | −9,547−28.8% | Reduced |
| Abc Arbitrage SA | 23,604 | $4.20M | 0.56% | +23,604 | New |
| Credit Industriel Et Commercial | 23,050 | $4.10M | 0.65% | +23,050 | New |
| Creative Planning | 22,920 | $4.08M | 0.00% | +5,811+34.0% | Added |
| Capricorn Fund Managers Ltd | 22,811 | $4.06M | 0.63% | +22,811 | New |
| Quantinno Capital Management LP | 22,501 | $4.00M | 0.01% | +9,248+69.8% | Added |
| New York Life Investment Management LLC | 22,191 | $3.95M | 0.03% | +22,191 | New |
| Cardinal Capital Management | 22,132 | $3.94M | 0.51% | +670+3.1% | Added |
| Amalgamated Bank | 21,832 | $3.88M | 0.03% | +281+1.3% | Added |
| ING Groep NV | 21,700 | $3.86M | 0.02% | +21,700 | New |
| Liontrust Investment Partners LLP | 20,138 | $3.58M | 0.06% | −607,658−96.8% | Reduced |
| Janus Henderson Group PLC | 20,000 | $3.56M | 0.00% | 00.0% | Unchanged |
| D. E. Shaw & Co., Inc. | 19,789 | $3.52M | 0.00% | −46,227−70.0% | Reduced |
| Police & Firemen's Retirement System of New Jersey | 19,484 | $3.47M | 0.03% | 00.0% | Unchanged |
| Treasurer of the State of North Carolina | 19,294 | $3.43M | 0.01% | +408+2.2% | Added |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 18,940 | $3.37M | 0.02% | +7,515+65.8% | Added |
| Vanguard Global Advisers, LLC | 18,433 | $3.28M | 0.00% | +18,433 | New |
| Mercer Global Advisors Inc | 18,139 | $3.23M | 0.00% | +7,277+67.0% | Added |
| South Dakota Investment Council | 17,568 | $3.13M | 0.06% | −3,700−17.4% | Reduced |
| Mutual of America Capital Management LLC | 17,496 | $3.11M | 0.04% | −1,505−7.9% | Reduced |
| State of New Jersey Common Pension Fund D | 16,320 | $2.90M | 0.01% | −332−2.0% | Reduced |
| LMR Partners LLP | 16,300 | $2.90M | 0.03% | +16,300 | New |
| ExodusPoint Capital Management, LP | 15,979 | $2.84M | 0.03% | +6,594+70.3% | Added |
| ADAR1 Capital Management, LLC | 15,000 | $2.67M | 0.16% | 00.0% | Unchanged |
| P Schoenfeld Asset Management LP | 15,000 | $2.67M | 2.12% | +15,000 | New |
| Teachers Retirement System of the State of Kentucky | 14,771 | $2.63M | 0.02% | 00.0% | Unchanged |
| Brown Advisory Inc | 14,734 | $2.62M | 0.00% | −120−0.8% | Reduced |
| Handelsbanken Fonder AB | 14,730 | $2.62M | 0.01% | 00.0% | Unchanged |
| Wealth Enhancement Advisory Services, LLC | 16,837 | $2.56M | 0.01% | +5,466+48.1% | Added |
| Intech Investment Management LLC | 14,216 | $2.53M | 0.02% | −10,549−42.6% | Reduced |
| Baird Financial Group, Inc. | 14,192 | $2.52M | 0.00% | −16,487−53.7% | Reduced |
| Empower Advisory Group, LLC | 14,105 | $2.51M | 0.01% | +1,000+7.6% | Added |
| State of Tennessee, Treasury Department | 13,918 | $2.48M | 0.01% | 00.0% | Unchanged |
| Yousif Capital Management, LLC | 13,868 | $2.47M | 0.03% | −660−4.5% | Reduced |
| Public Employees Retirement System of Ohio | 13,446 | $2.39M | 0.01% | −433−3.1% | Reduced |
| Louisiana State Employees Retirement System | 13,200 | $2.35M | 0.04% | +600+4.8% | Added |
| SEI Investments Co | 13,195 | $2.35M | 0.00% | +5,480+71.0% | Added |
| Skandinaviska Enskilda Banken AB (publ) | 12,978 | $2.31M | 0.05% | +12,978 | New |
| Envestnet Asset Management Inc | 12,596 | $2.24M | 0.00% | −4,379−25.8% | Reduced |
| Arizona State Retirement System | 12,541 | $2.23M | 0.01% | −277−2.2% | Reduced |
| Alpine Global Management, LLC | 12,500 | $2.22M | 0.34% | +12,500 | New |
| Oxford Asset Management LLP | 12,202 | $2.17M | 0.88% | +12,202 | New |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 12,140 | $2.16M | 0.00% | +2,442+25.2% | Added |
| Advisors Asset Management, Inc. | 12,080 | $2.15M | 0.04% | −7,778−39.2% | Reduced |
| Mint Tower Capital Management B.V. | 12,000 | $2.13M | 0.21% | +12,000 | New |
| Fifth Third Bancorp | 11,736 | $2.09M | 0.00% | +11,159+1,934.0% | Added |
| Vanguard Investments Australia, Ltd. | 11,498 | $2.05M | 0.01% | +11,498 | New |
| Paradigm Capital Management Inc | 11,353 | $2.02M | 0.08% | 00.0% | Unchanged |
| Wells Fargo & Company | 11,337 | $2.02M | 0.00% | −7,360−39.4% | Reduced |
| Occudo Quantitative Strategies LP | 11,269 | $2.01M | 0.11% | +1,606+16.6% | Added |
| Harvest Management LLC | 11,000 | $1.96M | 1.04% | +11,000 | New |
| State of Michigan Retirement System | 10,996 | $1.96M | 0.01% | +200+1.9% | Added |
| BNP Paribas Arbitrage, SA | 10,993 | $1.96M | 0.00% | +3,464+46.0% | Added |
| KLP Kapitalforvaltning AS | 10,900 | $1.94M | 0.01% | +300+2.8% | Added |
| Brevan Howard Capital Management LP | 10,628 | $1.89M | 0.02% | +10,628 | New |
| Lockerman Financial Group, Inc. | 10,500 | $1.87M | 3.36% | −1,300−11.0% | Reduced |
| JustInvest LLC | 10,251 | $1.82M | 0.02% | +2,728+36.3% | Added |
| Northwestern Mutual Investment Management Company, LLC | 10,228 | $1.82M | 0.03% | +13+0.1% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 10,187 | $1.81M | 0.00% | −3,350−24.7% | Reduced |
| Moore Capital Management, LP | 10,020 | $1.78M | 0.06% | +10,020 | New |
| Xponance, Inc. | 9,958 | $1.77M | 0.01% | +1,220+14.0% | Added |
| New Mexico Educational Retirement Board | 9,900 | $1.76M | 0.05% | 00.0% | Unchanged |
| Oregon Public Employees Retirement Fund | 9,374 | $1.67M | 0.02% | +300+3.3% | Added |