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 |
|---|---|---|---|---|---|
| Police & Firemen's Retirement System of New Jersey | 19,484 | $3.47M | 0.03% | 00.0% | Unchanged |
| D. E. Shaw & Co., Inc. | 19,789 | $3.52M | 0.00% | −46,227−70.0% | Reduced |
| Janus Henderson Group PLC | 20,000 | $3.56M | 0.00% | 00.0% | Unchanged |
| Liontrust Investment Partners LLP | 20,138 | $3.58M | 0.06% | −607,658−96.8% | Reduced |
| ING Groep NV | 21,700 | $3.86M | 0.02% | +21,700 | New |
| Amalgamated Bank | 21,832 | $3.88M | 0.03% | +281+1.3% | Added |
| Cardinal Capital Management | 22,132 | $3.94M | 0.51% | +670+3.1% | Added |
| New York Life Investment Management LLC | 22,191 | $3.95M | 0.03% | +22,191 | New |
| Quantinno Capital Management LP | 22,501 | $4.00M | 0.01% | +9,248+69.8% | Added |
| Capricorn Fund Managers Ltd | 22,811 | $4.06M | 0.63% | +22,811 | New |
| Creative Planning | 22,920 | $4.08M | 0.00% | +5,811+34.0% | Added |
| Credit Industriel Et Commercial | 23,050 | $4.10M | 0.65% | +23,050 | New |
| Abc Arbitrage SA | 23,604 | $4.20M | 0.56% | +23,604 | New |
| Manufacturers Life Insurance Company, The | 23,637 | $4.20M | 0.00% | −9,547−28.8% | Reduced |
| Centiva Capital, LP | 23,713 | $4.22M | 0.20% | +23,713 | New |
| New York State Common Retirement Fund | 24,160 | $4.30M | 0.01% | 00.0% | Unchanged |
| Westmount Partners, LLC | 24,232 | $4.31M | 1.06% | 00.0% | Unchanged |
| MetLife Investment Management | 24,485 | $4.36M | 0.02% | +13+0.1% | Added |
| TPG GP A, LLC | 25,000 | $4.45M | 0.12% | +25,000 | New |
| Natixis | 25,495 | $4.53M | 0.02% | +23,209+1,015.3% | Added |
| Great West Life Assurance Co | 26,443 | $4.71M | 0.01% | −167−0.6% | Reduced |
| Quantbot Technologies LP | 27,425 | $4.88M | 0.20% | −29,500−51.8% | Reduced |
| Storebrand Asset Management AS | 27,714 | $4.93M | 0.01% | 00.0% | Unchanged |
| Tokio Marine Asset Management Co Ltd | 29,400 | $5.23M | 0.19% | +29,400 | New |
| Vestcor Inc | 30,000 | $5.34M | 0.15% | +26,175+684.3% | Added |
| Taconic Capital Advisors LP | 30,000 | $5.34M | 3.65% | +30,000 | New |
| Engineers Gate Manager LP | 30,423 | $5.41M | 0.07% | −53,035−63.5% | Reduced |
| Groupe la Francaise | 31,950 | $5.68M | 0.08% | +31,950 | New |
| Ieq Capital, LLC | 32,217 | $5.73M | 0.03% | +32,217 | New |
| Alberta Investment Management Corp | 34,107 | $6.07M | 0.04% | +34,107 | New |
| CWM, LLC | 34,690 | $6.17M | 0.02% | +16,155+87.2% | Added |
| BLI - Banque de Luxembourg Investments | 48,839 | $6.30M | 0.19% | 00.0% | Unchanged |
| Fortress Investment Group LLC | 35,900 | $6.39M | 1.63% | +35,900 | New |
| Thrivent Financial for Lutherans | 36,420 | $6.48M | 0.01% | +13,246+57.2% | Added |
| STRS Ohio | 37,213 | $6.62M | 0.03% | +298+0.8% | Added |
| New York State Teachers Retirement System | 38,569 | $6.86M | 0.01% | −1,479−3.7% | Reduced |
| Cerity Partners LLC | 38,820 | $6.90M | 0.01% | +15,046+63.3% | Added |
| State Board of Administration of Florida Retirement System | 39,654 | $7.05M | 0.01% | −95−0.2% | Reduced |
| Vanguard Asset Management, Ltd | 40,876 | $7.27M | 0.01% | +40,876 | New |
| NS Partners Ltd | 42,004 | $7.47M | 0.33% | −344−0.8% | Reduced |
| Lighthouse Investment Partners, LLC | 42,851 | $7.62M | 0.29% | +42,851 | New |
| Price T Rowe Associates Inc | 45,830 | $8.15M | 0.00% | −167,764−78.5% | Reduced |
| Caxton Associates LLP | 45,917 | $8.17M | 0.19% | +45,917 | New |
| Toroso Investments, LLC | 49,720 | $8.84M | 0.03% | −35,574−41.7% | Reduced |
| California State Teachers Retirement System | 53,287 | $9.48M | 0.01% | +9,464+21.6% | Added |
| Retirement Systems of Alabama | 55,974 | $9.96M | 0.03% | +1,179+2.2% | Added |
| Mariner, LLC | 61,265 | $10.9M | 0.01% | +39,816+185.6% | Added |
| Legal & General Group Plc | 62,545 | $11.1M | 0.00% | −29,891−32.3% | Reduced |
| Wilson Asset Management (International) Pty Ltd | 63,984 | $11.4M | 3.21% | +24,547+62.2% | Added |
| Carmignac Gestion | 64,831 | $11.5M | 0.18% | +64,831 | New |
| Picton Mahoney Asset Management | 65,000 | $11.6M | 0.12% | +54,500+519.0% | Added |
| Ameriprise Financial Inc | 65,203 | $11.6M | 0.00% | −403,204−86.1% | Reduced |
| Verition Fund Management LLC | 66,853 | $11.9M | 0.12% | +13,833+26.1% | Added |
| Healthcare of Ontario Pension Plan Trust Fund | 67,600 | $12.0M | 0.02% | +67,600 | New |
| Invesco Ltd. | 69,144 | $12.3M | 0.00% | −250,164−78.3% | Reduced |
| Voloridge Investment Management, LLC | 70,000 | $12.5M | 0.05% | +30,443+77.0% | Added |
| California Public Employees Retirement System | 77,397 | $13.8M | 0.01% | +14,038+22.2% | Added |
| Gabelli & Co Investment Advisers, Inc. | 88,650 | $15.8M | 2.34% | +88,650 | New |
| Deutsche Bank AG | 89,387 | $15.9M | 0.01% | +82,651+1,227.0% | Added |
| Swiss National Bank | 90,300 | $16.1M | 0.01% | −800−0.9% | Reduced |
| CIBRA Capital Ltd | 90,376 | $16.1M | 7.76% | +90,376 | New |
| Marshall Wace, LLP | 90,657 | $16.1M | 0.02% | −128,655−58.7% | Reduced |
| Gamco Investors, Inc. Et Al | 92,000 | $16.4M | 0.16% | +9,000+10.8% | Added |
| Schroder Investment Management Group | 96,179 | $17.1M | 0.01% | −379,325−79.8% | Reduced |
| Kryger Capital LLC | 100,589 | $17.9M | 1.27% | +100,589 | New |
| Soros Fund Management LLCSuperinvestorSoros Fund Management | 100,838 | $17.9M | 0.25% | +100,838 | New |
| Principal Financial Group Inc | 102,718 | $18.3M | 0.01% | +4,860+5.0% | Added |
| Blackstone Group Inc. | 109,383 | $19.5M | 0.08% | +109,383 | New |
| Nomura Holdings Inc | 109,390 | $19.5M | 0.16% | +109,390 | New |
| Nuveen, LLC | 111,542 | $19.8M | 0.01% | −112,526−50.2% | Reduced |
| Weiss Asset Management LP | 112,600 | $20.0M | 0.37% | +112,600 | New |
| Winton Group Ltd | 112,783 | $20.1M | 0.70% | +112,783 | New |
| Schonfeld Strategic Advisors LLC | 117,297 | $20.9M | 0.17% | −147,739−55.7% | Reduced |
| Sagefield Capital LP | 122,240 | $21.7M | 1.56% | +122,240 | New |
| GW&K Investment Management, LLC | 122,781 | $21.8M | 0.19% | +3,419+2.9% | Added |
| Gabelli Funds LLC | 126,082 | $22.4M | 0.15% | +93,382+285.6% | Added |
| Rhumbline Advisers | 129,619 | $23.1M | 0.02% | +5,063+4.1% | Added |
| UBS Asset Management Americas Inc | 133,689 | $23.8M | 0.00% | +14,725+12.4% | Added |
| TIG Advisors, LLC | 135,197 | $24.0M | 1.15% | +135,197 | New |
| Grantham, Mayo, Van Otterloo & Co. LLC | 137,617 | $24.5M | 0.06% | −6,208−4.3% | Reduced |
| Westchester Capital Management, LLC | 138,428 | $24.6M | 1.19% | +138,428 | New |
| Champlain Investment Partners, LLC | 141,284 | $25.1M | 0.32% | +141,284 | New |
| Capula Management Ltd | 142,800 | $25.4M | 0.22% | +142,800 | New |
| Tudor Investment Corp Et Al | 143,884 | $25.6M | 0.14% | +127,642+785.9% | Added |
| Bank of Nova Scotia | 152,584 | $27.1M | 0.05% | +147,337+2,808.0% | Added |
| Woodline Partners LP | 153,234 | $27.3M | 0.10% | +153,234 | New |
| Glazer Capital, LLC | 157,858 | $28.1M | 0.60% | +157,858 | New |
| Dimensional Fund Advisors LP | 164,402 | $29.2M | 0.01% | −9,548−5.5% | Reduced |
| Man Group plc | 166,235 | $29.6M | 0.06% | +18,819+12.8% | Added |
| Raymond James Financial Inc | 170,527 | $30.3M | 0.01% | −15,983−8.6% | Reduced |
| Readystate Asset Management LP | 171,115 | $30.4M | 1.78% | +171,115 | New |
| Arrowstreet Capital, Limited Partnership | 172,588 | $30.7M | 0.02% | +172,588 | New |
| American Century Companies Inc | 188,073 | $33.5M | 0.02% | +9,315+5.2% | Added |
| Alpine Associates Management Inc. | 189,000 | $33.6M | 1.98% | +189,000 | New |
| Water Island Capital LLC | 194,197 | $34.5M | 4.60% | +194,197 | New |
| Erste Asset Management GmbH | 200,000 | $35.5M | 0.33% | 00.0% | Unchanged |
| Canada Pension Plan Investment Board | 209,500 | $37.3M | 0.02% | +171,000+444.2% | Added |
| Beryl Capital Management LLC | 217,103 | $38.6M | 35.54% | +217,103 | New |
| MUFG Securities EMEA plc | 225,400 | $40.1M | 0.60% | +225,400 | New |
| Bank of America Corp | 232,003 | $41.3M | 0.00% | −52,699−18.5% | Reduced |