Masimo Corp
MASIDelisted- Industry
- Electromedical & Electrotherapeutic Apparatus
- SEC CIK
- 0000937556
Masimo Corp was delisted in 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 |
|---|---|---|---|---|---|
| MAI Capital Management | 913 | $162.4K | 0.00% | +774+556.8% | Added |
| EverSource Wealth Advisors, LLC | 1,064 | $189.3K | 0.01% | +88+9.0% | Added |
| SRS Capital Advisors, Inc. | 1,076 | $191.4K | 0.01% | +998+1,279.5% | Added |
| Walleye Trading LLC | 1,100 | $195.7K | 0.00% | +1,100 | New |
| Knollwood Investment Advisory, LLC | 1,137 | $202.2K | 0.02% | +1,137 | New |
| Whittier Trust Co | 1,134 | $202.4K | 0.00% | 00.0% | Unchanged |
| Frec Markets, Inc. | 1,143 | $203.3K | 0.03% | +1,143 | New |
| Net Worth Advisory Group | 1,177 | $209.3K | 0.04% | +1,177 | New |
| Ballentine Partners, LLC | 1,177 | $209.4K | 0.00% | +1,177 | New |
| Essential Partners LLC | 1,183 | $210.4K | 0.07% | +296+33.4% | Added |
| Jane Street Group, LLC | 1,215 | $216.1K | 0.00% | −101,666−98.8% | Reduced |
| Oak Thistle LLC | 1,217 | $216.5K | 0.02% | +1,217 | New |
| Keel Point, LLC | 1,228 | $218.4K | 0.01% | +1,228 | New |
| KBC Group NV | 1,258 | $224.0K | 0.00% | 00.0% | Unchanged |
| Worldquant Millennium Advisors LLC | 1,270 | $225.9K | 0.00% | −17,288−93.2% | Reduced |
| FORA Capital, LLC | 1,280 | $227.7K | 0.02% | −3,894−75.3% | Reduced |
| United Capital Financial Advisers, LLC | 1,281 | $227.9K | 0.00% | +1,281 | New |
| R Squared Ltd | 1,289 | $229.3K | 0.13% | +1,289 | New |
| Parcion Private Wealth LLC | 1,291 | $229.6K | 0.01% | +1,291 | New |
| GenTrust, LLC | 1,304 | $231.9K | 0.01% | +1,304 | New |
| North Dakota State Investment Board | 1,318 | $234.4K | 0.01% | −284−17.7% | Reduced |
| Ground Swell Capital, LLC | 1,319 | $234.6K | 0.46% | +1,319 | New |
| Pinnacle Wealth Management Advisory Group, LLC | 1,324 | $235.5K | 0.02% | +1,324 | New |
| Wick Capital Partners, LLC | 1,326 | $235.9K | 0.04% | +1,326 | New |
| Corient IA LLC | 1,340 | $238.3K | 0.22% | +1,340 | New |
| Empowered Funds, LLC | 1,376 | $244.7K | 0.00% | +1,376 | New |
| Guggenheim Capital LLC | 1,407 | $250.3K | 0.00% | +1,407 | New |
| Nelson, Van Denburg & Campbell Wealth Management Group, LLC | 1,410 | $250.8K | 0.01% | −2,387−62.9% | Reduced |
| Warren Averett Asset Management, LLC | 1,415 | $251.7K | 0.00% | +1,415 | New |
| Andina Capital Management, LLC | 1,420 | $252.6K | 0.22% | +1,420 | New |
| Shelton Capital Management | 1,478 | $262.9K | 0.01% | −114−7.2% | Reduced |
| Calamos Advisors LLC | 1,511 | $268.8K | 0.00% | +1,511 | New |
| Calamos Wealth Management LLC | 1,511 | $268.8K | 0.01% | +1,511 | New |
| MML Investors Services, LLC | 1,524 | $271.1K | 0.00% | +1,524 | New |
| Caerus Investment Advisors, LLC | 1,526 | $271.4K | 0.11% | +1,526 | New |
| Fifth Third Wealth Advisors LLC | 1,528 | $271.8K | 0.01% | +1,528 | New |
| M&G Plc | 1,623 | $288.9K | 0.00% | 00.0% | Unchanged |
| TownSquare Capital, LLC | 1,638 | $291.4K | 0.07% | −806−33.0% | Reduced |
| Armistice Capital, LLC | 1,642 | $292.1K | 0.01% | +1,642 | New |
| CIBC Asset Management Inc | 1,669 | $296.9K | 0.00% | 00.0% | Unchanged |
| Sanctuary Advisors, LLC | 1,689 | $300.4K | 0.00% | +17+1.0% | Added |
| Inscription Capital, LLC | 1,713 | $304.7K | 0.03% | +143+9.1% | Added |
| Evolve Private Wealth, LLC | 1,713 | $304.7K | 0.02% | +1,713 | New |
| Wesleyan Assurance Society | 1,750 | $311.0K | 0.02% | −800−31.4% | Reduced |
| Silver Oak Securities, Inc | 1,755 | $312.2K | 0.02% | −200−10.2% | Reduced |
| Hantz Financial Services, Inc. | 1,762 | $313.0K | 0.00% | +1,107+169.0% | Added |
| CAPROCK Group, Inc. | 1,761 | $313.3K | 0.01% | +1,761 | New |
| Everence Capital Management Inc | 1,773 | $315.0K | 0.02% | +1,773 | New |
| Chicago Partners Investment Group LLC | 1,802 | $321.7K | 0.01% | +6+0.3% | Added |
| Pinnacle Associates Ltd | 1,824 | $324.4K | 0.00% | +157+9.4% | Added |
| GWM Advisors LLC | 1,827 | $325.0K | 0.00% | +1,715+1,531.3% | Added |
| Bessemer Group Inc | 1,857 | $331.0K | 0.00% | +1,716+1,217.0% | Added |
| Two Sigma Securities, LLC | 1,875 | $333.5K | 0.04% | −836−30.8% | Reduced |
| Krilogy Financial LLC | 1,879 | $335.0K | 0.01% | −1,483−44.1% | Reduced |
| Bridgewater Associates, LP | 1,899 | $337.8K | 0.00% | +280+17.3% | Added |
| Mission Wealth Management, LP | 1,905 | $338.8K | 0.01% | +20+1.1% | Added |
| Tower Research Capital LLC (TRC) | 1,919 | $341.3K | 0.01% | +717+59.7% | Added |
| Prudential Financial Inc | 1,955 | $347.7K | 0.00% | −3−0.2% | Reduced |
| Skopos Labs, Inc. | 2,015 | $358.4K | 0.01% | +2,015 | New |
| Maryland State Retirement & Pension System | 2,028 | $360.7K | 0.01% | 00.0% | Unchanged |
| Assetmark, Inc | 2,068 | $367.8K | 0.00% | +218+11.8% | Added |
| Vident Advisory, LLC | 2,103 | $374.1K | 0.00% | +355+20.3% | Added |
| Farther Finance Advisors, LLC | 2,118 | $377.0K | 0.00% | −26−1.2% | Reduced |
| Bull Harbor Capital LLC | 2,151 | $382.6K | 0.10% | +2,151 | New |
| AlphaGrep UK Ltd | 2,199 | $391.1K | 0.12% | −1,458−39.9% | Reduced |
| Sentinus, LLC | 2,250 | $400.2K | 0.04% | +503+28.8% | Added |
| Huntington National Bank | 2,251 | $400.4K | 0.00% | +2,171+2,713.8% | Added |
| Fiduciary Trust Co | 2,339 | $416.0K | 0.00% | 00.0% | Unchanged |
| Beese Fulmer Investment Management, Inc. | 2,360 | $419.8K | 0.03% | +358+17.9% | Added |
| Hardy Reed LLC | 2,381 | $423.5K | 0.03% | +209+9.6% | Added |
| Utah Retirement Systems | 2,382 | $423.7K | 0.00% | 00.0% | Unchanged |
| Polymer Capital Management (US) LLC | 2,398 | $426.5K | 0.06% | −7,125−74.8% | Reduced |
| DnB Asset Management AS | 2,411 | $428.8K | 0.00% | +2,411 | New |
| CWM Advisors, LLC | 2,497 | $444.2K | 0.03% | +2,459+6,471.1% | Added |
| KCM Investment Advisors LLC | 2,515 | $447.3K | 0.01% | 00.0% | Unchanged |
| NorthCrest Asset Manangement, LLC | 2,516 | $449.3K | 0.01% | −617−19.7% | Reduced |
| Jones Financial Companies LLLP | 2,545 | $450.7K | 0.00% | +2,240+734.4% | Added |
| Summit Trail Advisors, LLC | 2,551 | $453.7K | 0.01% | −9,145−78.2% | Reduced |
| Allworth Financial LP | 2,594 | $461.3K | 0.00% | +899+53.0% | Added |
| Crossmark Global Holdings, Inc. | 2,647 | $470.8K | 0.01% | +7+0.3% | Added |
| Buckhead Capital Management LLC | 2,650 | $471.4K | 0.18% | 00.0% | Unchanged |
| Blueshift Asset Management, LLC | 2,665 | $474.0K | 0.14% | +699+35.6% | Added |
| O'Shaughnessy Asset Management, LLC | 2,691 | $478.6K | 0.00% | +929+52.7% | Added |
| HB Wealth Management, LLC | 2,704 | $481.0K | 0.00% | +367+15.7% | Added |
| 180 Wealth Advisors, LLC | 2,728 | $485.2K | 0.06% | +66+2.5% | Added |
| Federation des caisses Desjardins du Quebec | 2,739 | $487.2K | 0.00% | −918−25.1% | Reduced |
| Royal Bank of Canada | 2,748 | $489.0K | 0.00% | −8,592−75.8% | Reduced |
| Machina Capital S.A.S. | 2,761 | $491.1K | 0.10% | +2,761 | New |
| Swiss Life Asset Management Ltd | 2,812 | $500.2K | 0.00% | +639+29.4% | Added |
| Federated Hermes, Inc. | 2,921 | $519.6K | 0.00% | −751−20.5% | Reduced |
| Integrated Wealth Concepts LLC | 3,077 | $547.3K | 0.00% | +3,077 | New |
| Diametric Capital, LP | 3,100 | $551.4K | 0.14% | +3,100 | New |
| Canvas Wealth Advisors, LLC | 3,191 | $567.6K | 0.10% | +3,191 | New |
| Buckingham Strategic Partners | 3,296 | $586.2K | 0.01% | +3,296 | New |
| Securian Asset Management, Inc | 3,333 | $592.8K | 0.02% | 00.0% | Unchanged |
| Oxford Financial Group Ltd | 3,430 | $610.1K | 0.03% | 00.0% | Unchanged |
| RMB Capital Management, LLC | 3,542 | $630.0K | 0.01% | +399+12.7% | Added |
| Mitsubishi UFJ Kokusai Asset Management Co., Ltd. | 3,558 | $632.9K | 0.00% | +56+1.6% | Added |
| M&T Bank Corp | 3,581 | $637.4K | 0.00% | +257+7.7% | Added |
| Verus Capital Partners, LLC | 3,651 | $649.4K | 0.04% | 00.0% | Unchanged |