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, Q3 2025
Institutional positions in Masimo Corp as of Sep 30, 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
- 358
- −17 vs. Q2 2025
- Shares held
- 56.2M
- −1.27M (−2.2%) vs. Q2 2025
- Total value
- $8.29B
- −$1.38B (−14.3%) vs. Q2 2025
- New holders
- 46
- 120 more added
- Sold out
- 63
- 121 more reduced
4 institutions that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 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, Q3 2025
Shares, value and share of portfolio for each institution holding Masimo Corp; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BlackRock, Inc. | 10,361,091 | $1.53B | 0.03% | −146,235−1.4% | Reduced |
| FMR LLC | 8,213,721 | $1.21B | 0.06% | +32,349+0.4% | Added |
| Vanguard Group Inc | 4,810,011 | $709.7M | 0.01% | +171,876+3.7% | Added |
| Politan Capital Management LP | 4,589,648 | $677.2M | 61.54% | −126,888−2.7% | Reduced |
| Massachusetts Financial Services Co | 2,619,960 | $386.6M | 0.12% | +149,567+6.1% | Added |
| T. Rowe Price Investment Management, Inc. | 2,126,763 | $313.8M | 0.19% | −373,381−14.9% | Reduced |
| Capital Research Global Investors | 1,854,128 | $273.6M | 0.05% | −1,542−0.1% | Reduced |
| State Street Corp | 1,484,471 | $219.0M | 0.01% | −1,923−0.1% | Reduced |
| Westfield Capital Management Co LP | 1,419,250 | $209.4M | 0.88% | +238,047+20.2% | Added |
| Alyeska Investment Group, L.P. | 1,381,085 | $203.8M | 0.62% | +246,595+21.7% | Added |
| Viking Global Investors LPSuperinvestorViking Global Investors | 1,073,433 | $158.4M | 0.41% | +306,007+39.9% | Added |
| Geode Capital Management, LLC | 942,439 | $139.1M | 0.01% | +46,021+5.1% | Added |
| Goldman Sachs Group Inc | 744,402 | $109.8M | 0.02% | +272,877+57.9% | Added |
| Morgan Stanley | 690,601 | $101.9M | 0.01% | −76,774−10.0% | Reduced |
| RTW Investments, LP | 683,294 | $100.8M | 1.24% | 00.0% | Unchanged |
| Liontrust Investment Partners LLP | 681,895 | $100.6M | 1.47% | −26,405−3.7% | Reduced |
| Squarepoint Ops LLC | 620,932 | $91.6M | 0.19% | +546,905+738.8% | Added |
| Durable Capital Partners LP | 620,619 | $91.6M | 0.68% | −543,279−46.7% | Reduced |
| Price T Rowe Associates Inc | 514,946 | $76.0M | 0.01% | +109,486+27.0% | Added |
| Ameriprise Financial Inc | 460,951 | $68.0M | 0.02% | +66,464+16.8% | Added |
| Bank of America Corp | 405,061 | $59.8M | 0.00% | +214,885+113.0% | Added |
| Sumitomo Mitsui Trust Holdings, Inc. | 397,248 | $58.6M | 0.03% | −73,793−15.7% | Reduced |
| Northern Trust Corp | 392,142 | $57.9M | 0.01% | +3,600+0.9% | Added |
| Bamco Inc | 388,747 | $57.4M | 0.15% | +4,158+1.1% | Added |
| Charles Schwab Investment Management Inc | 364,457 | $53.8M | 0.01% | −6,277−1.7% | Reduced |
| CI Private Wealth, LLC | 336,215 | $49.6M | 0.08% | +5,801+1.8% | Added |
| Schroder Investment Management Group | 336,650 | $48.1M | 0.04% | −111,851−24.9% | Reduced |
| Invesco Ltd. | 321,363 | $47.4M | 0.01% | +84,060+35.4% | Added |
| Bank of New York Mellon Corp | 312,618 | $46.1M | 0.01% | −4,975−1.6% | Reduced |
| Dimensional Fund Advisors LP | 259,668 | $38.3M | 0.01% | −263,558−50.4% | Reduced |
| Grantham, Mayo, Van Otterloo & Co. LLC | 242,822 | $35.8M | 0.10% | +2,259+0.9% | Added |
| Comerica Bank | 233,427 | $34.4M | 0.13% | +43,605+23.0% | Added |
| Nuveen, LLC | 225,712 | $33.3M | 0.01% | +76,054+50.8% | Added |
| Raymond James Financial Inc | 196,021 | $28.9M | 0.01% | −4,208−2.1% | Reduced |
| UBS Group AG | 169,800 | $25.1M | 0.00% | +27,636+19.4% | Added |
| American Century Companies Inc | 168,341 | $24.8M | 0.01% | +16,113+10.6% | Added |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 164,926 | $24.3M | 0.06% | +99,105+150.6% | Added |
| Erste Asset Management GmbH | 160,000 | $22.9M | 0.22% | +68,000+73.9% | Added |
| Adage Capital Partners GP, L.L.C. | 150,000 | $22.1M | 0.04% | +150,000 | New |
| Rockefeller Capital Management L.P. | 147,428 | $21.8M | 0.04% | +31,802+27.5% | Added |
| Marshall Wace, LLP | 134,122 | $19.8M | 0.02% | +126,914+1,760.7% | Added |
| Toroso Investments, LLC | 132,557 | $19.6M | 0.08% | +26,359+24.8% | Added |
| Gotham Asset Management, LLC | 129,026 | $19.0M | 0.08% | −36,330−22.0% | Reduced |
| Royal Bank of Canada | 127,117 | $18.8M | 0.00% | +17,427+15.9% | Added |
| Rhumbline Advisers | 126,608 | $18.7M | 0.02% | −888−0.7% | Reduced |
| GW&K Investment Management, LLC | 124,047 | $18.3M | 0.16% | +123,912+91,786.7% | Added |
| Citigroup Inc | 116,672 | $17.2M | 0.01% | +66,710+133.5% | Added |
| Cramer Rosenthal McGlynn LLC | 114,605 | $16.9M | 1.09% | +19,666+20.7% | Added |
| UBS Asset Management Americas Inc | 109,110 | $16.1M | 0.00% | −100,453−47.9% | Reduced |
| DF Dent & Co Inc | 108,653 | $16.0M | 0.21% | +108,653 | New |
| JPMorgan Chase & Co | 107,941 | $15.9M | 0.00% | −30,149−21.8% | Reduced |
| TD Asset Management Inc | 107,858 | $15.9M | 0.01% | −59,318−35.5% | Reduced |
| Legal & General Group Plc | 102,677 | $15.1M | 0.00% | −1,687−1.6% | Reduced |
| Principal Financial Group Inc | 102,184 | $15.1M | 0.01% | −283−0.3% | Reduced |
| Falcon Edge Capital, LP | 97,102 | $14.3M | 1.45% | −4,966−4.9% | Reduced |
| Bellevue Group AG | 96,968 | $14.3M | 0.30% | +7,295+8.1% | Added |
| Walleye Capital LLC | 89,363 | $13.2M | 0.11% | +46,131+106.7% | Added |
| Swiss National Bank | 89,300 | $13.2M | 0.01% | +1,600+1.8% | Added |
| Citadel Advisors LLC | 87,750 | $12.9M | 0.01% | +63,473+261.5% | Added |
| Amundi | 84,894 | $12.6M | 0.00% | +43,311+104.2% | Added |
| Jupiter Asset Management Ltd | 84,657 | $12.5M | 0.11% | +84,657 | New |
| Gamco Investors, Inc. Et Al | 83,800 | $12.4M | 0.12% | −700−0.8% | Reduced |
| California Public Employees Retirement System | 78,460 | $11.6M | 0.01% | +5,653+7.8% | Added |
| Barclays PLC | 77,804 | $11.5M | 0.00% | +21,690+38.7% | Added |
| Swedbank AB | 67,500 | $9.96M | 0.01% | −6,300−8.5% | Reduced |
| BLI - Banque de Luxembourg Investments | 68,500 | $9.79M | 0.29% | −18,200−21.0% | Reduced |
| First Trust Advisors LP | 61,934 | $9.14M | 0.01% | −37,678−37.8% | Reduced |
| Retirement Systems of Alabama | 55,831 | $8.24M | 0.03% | +828+1.5% | Added |
| Alliancebernstein L.P. | 53,561 | $7.90M | 0.00% | −790,506−93.7% | Reduced |
| Bridger Management, LLC | 47,841 | $7.06M | 3.80% | +14,200+42.2% | Added |
| California State Teachers Retirement System | 43,355 | $6.40M | 0.01% | +20.0% | Added |
| NS Partners Ltd | 42,394 | $6.26M | 0.24% | −172−0.4% | Reduced |
| State Board of Administration of Florida Retirement System | 41,079 | $6.06M | 0.01% | −2,240−5.2% | Reduced |
| New York State Teachers Retirement System | 40,048 | $5.91M | 0.01% | 00.0% | Unchanged |
| Quantinno Capital Management LP | 39,589 | $5.84M | 0.02% | −80,794−67.1% | Reduced |
| STRS Ohio | 36,913 | $5.45M | 0.02% | −19,070−34.1% | Reduced |
| Baird Financial Group, Inc. | 35,834 | $5.29M | 0.01% | −4,886−12.0% | Reduced |
| Capital Fund Management S.A. | 34,424 | $5.08M | 0.05% | +34,424 | New |
| Manufacturers Life Insurance Company, The | 34,193 | $5.05M | 0.00% | −24,521−41.8% | Reduced |
| Victory Capital Management Inc | 33,045 | $4.88M | 0.00% | +3,677+12.5% | Added |
| Gabelli Funds LLC | 32,700 | $4.82M | 0.03% | 00.0% | Unchanged |
| Nordea Investment Management AB | 32,499 | $4.69M | 0.00% | +631+2.0% | Added |
| Tudor Investment Corp Et Al | 31,641 | $4.67M | 0.03% | +31,641 | New |
| Engineers Gate Manager LP | 30,773 | $4.54M | 0.05% | +23,900+347.7% | Added |
| AQR Capital Management LLC | 31,034 | $4.44M | 0.00% | −19,222−38.2% | Reduced |
| Intech Investment Management LLC | 29,690 | $4.38M | 0.04% | −2,060−6.5% | Reduced |
| Gluskin Sheff & Assoc Inc | 27,923 | $4.12M | 0.52% | +19,699+239.5% | Added |
| Storebrand Asset Management AS | 27,732 | $4.09M | 0.01% | +10,000+56.4% | Added |
| Ensign Peak Advisors, Inc | 27,361 | $4.04M | 0.01% | +11,385+71.3% | Added |
| Wilson Asset Management (International) Pty Ltd | 27,234 | $4.02M | 0.99% | 00.0% | Unchanged |
| Great West Life Assurance Co | 27,120 | $3.87M | 0.01% | +1,000+3.8% | Added |
| MetLife Investment Management | 25,849 | $3.81M | 0.02% | −436−1.7% | Reduced |
| Logan Capital Management Inc | 25,105 | $3.70M | 0.16% | −6,247−19.9% | Reduced |
| Westmount Partners, LLC | 25,866 | $3.69M | 0.95% | 00.0% | Unchanged |
| Advisors Asset Management, Inc. | 24,188 | $3.57M | 0.06% | −195−0.8% | Reduced |
| New York State Common Retirement Fund | 24,160 | $3.56M | 0.00% | 00.0% | Unchanged |
| South Dakota Investment Council | 23,068 | $3.40M | 0.07% | −1,700−6.9% | Reduced |
| Amalgamated Bank | 22,601 | $3.33M | 0.02% | +858+3.9% | Added |
| State of Wisconsin Investment Board | 21,738 | $3.21M | 0.01% | +94+0.4% | Added |
| SEI Investments Co | 21,655 | $3.20M | 0.00% | −8,851−29.0% | Reduced |