MasimoMASI
13F holders, Q3 2025 (September 30)358holders −20
44new positions
63sold out
10famous investors
$147.50avg. 13F price*
At the end of Q3 2025, 358 institutions reported holding Masimo Corp. (MASI) in their 13F filings, down 20 from Q2 2025. 44 opened new positions and 63 sold out. The largest holders were BlackRock, Inc. ($1.5B), FMR LLC ($1.2B) and Vanguard Group Inc. ($709.7M). 10 famous investors held it, including Andreas Halvorsen (0.4% of Viking Global Investors's portfolio), Ron Baron (0.2% of Baron Capital (BAMCO)'s portfolio) and Mario Gabelli (0.1% of GAMCO Investors's portfolio).
- Company
- Masimo Corp.
- CUSIP
- 574795100
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 44 | $82.6M |
| Exits | 63 | $362.0M |
All 13F filers, Q2 2025 → Q3 2025: 4,170,999 shares bought and 5,440,991 shares sold, net −1,269,992 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 358 holders
| BlackRock, Inc. | 0.03% | Reduce -1.4% | 10,361,091 | $1.5B |
| FMR LLC | 0.06% | Add +0.4% | 8,213,721 | $1.2B |
| Vanguard Group Inc. | 0.01% | Add +3.7% | 4,810,011 | $709.7M |
| Politan Capital Management LP | 61.54% | Reduce -2.7% | 4,589,648 | $677.2M |
| Massachusetts Financial Services Co. | 0.12% | Add +6.0% | 2,619,960 | $386.6M |
| T. Rowe Price Investment Management, Inc. | 0.19% | Reduce -14.9% | 2,126,763 | $313.8M |
| Capital Research Global Investors | 0.05% | Reduce -0.1% | 1,854,128 | $273.6M |
| State Street Corp. | 0.01% | Reduce -0.1% | 1,484,471 | $219.0M |
| Westfield Capital Management Co. LP | 0.88% | Add +20.1% | 1,419,250 | $209.4M |
| Alyeska Investment Group, L.P. | 0.62% | Add +21.7% | 1,381,085 | $203.8M |
| Viking Global Investors | 0.41% | Add +39.9% | 1,073,433 | $158.4M |
| Geode Capital Management, LLC | 0.01% | Add +5.1% | 942,439 | $139.1M |
| Goldman Sachs Group Inc. | 0.02% | Add +57.9% | 744,402 | $109.8M |
| Morgan Stanley | 0.01% | Reduce -10.0% | 690,601 | $101.9M |
| RTW Investments, LP | 1.24% | No change | 683,294 | $100.8M |
| Liontrust Investment Partners LLP | 1.47% | Reduce -3.7% | 681,895 | $100.6M |
| Squarepoint Ops LLC | 0.20% | Add +738.8% | 620,932 | $91.6M |
| Durable Capital Partners LP | 0.68% | Reduce -46.7% | 620,619 | $91.6M |
| T. Rowe Price Associates Inc. | 0.01% | Add +27.0% | 514,946 | $76.0M |
| Ameriprise Financial Inc. | 0.02% | Add +16.9% | 460,951 | $68.0M |
| Bank of America Corp. | 0.00% | Add +113.0% | 405,061 | $59.8M |
| Sumitomo Mitsui Trust Group, Inc. | 0.03% | Reduce -15.7% | 397,248 | $58.6M |
| Northern Trust Corp. | 0.01% | Add +0.9% | 392,142 | $57.9M |
| Baron Capital (BAMCO) | 0.15% | Add +1.1% | 388,747 | $57.4M |
| Charles Schwab Investment Management Inc. | 0.01% | Reduce -1.7% | 364,457 | $53.8M |
| Corient Private Wealth LP | 0.08% | Add +1.8% | 336,215 | $49.6M |
| Schroder Investment Management Group | 0.04% | Reduce -24.9% | 336,650 | $48.1M |
| Invesco Ltd. | 0.01% | Add +35.4% | 321,363 | $47.4M |
| Bank of New York Mellon Corp | 0.01% | Reduce -1.6% | 312,618 | $46.1M |
| Dimensional Fund Advisors LP | 0.01% | Reduce -50.4% | 259,668 | $38.3M |
| GMO | 0.10% | Add +0.9% | 242,822 | $35.8M |
| Comerica Bank | 0.13% | Add +23.0% | 233,427 | $34.4M |
| Nuveen, LLC | 0.01% | Add +50.8% | 225,712 | $33.3M |
| Raymond James Financial Inc. | 0.01% | Reduce -2.1% | 196,021 | $28.9M |
| UBS Group AG | 0.00% | Add +19.4% | 169,800 | $25.1M |
| American Century Companies Inc. | 0.01% | Add +10.6% | 168,341 | $24.8M |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 0.06% | Add +150.6% | 164,926 | $24.3M |
| Erste Asset Management GmbH | 0.22% | Add +73.9% | 160,000 | $22.9M |
| Adage Capital Partners Gp, L.L.C. | 0.04% | New | 150,000 | $22.1M |
| Rockefeller Capital Management L.P. | 0.04% | Add +27.5% | 147,428 | $21.8M |
| Marshall Wace, LLP | 0.02% | Add +1760.7% | 134,122 | $19.8M |
| Tidal Investments LLC | 0.08% | Add +24.8% | 132,557 | $19.6M |
| Gotham Asset Management | 0.08% | Reduce -22.0% | 129,026 | $19.0M |
| Royal Bank of Canada | 0.00% | Add +15.9% | 127,117 | $18.8M |
| Rhumbline Advisers | 0.01% | Reduce -0.7% | 126,608 | $18.7M |
| GW&K Investment Management, LLC | 0.16% | Add +91786.7% | 124,047 | $18.3M |
| Citigroup Inc. | 0.01% | Add +133.5% | 116,672 | $17.2M |
| Cramer Rosenthal McGlynn LLC | 1.09% | Add +20.7% | 114,605 | $16.9M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Reduce -47.9% | 109,110 | $16.1M |
| DF Dent & Co. Inc. | 0.21% | New | 108,653 | $16.0M |
| JPMorgan Chase & Co. | 0.00% | Reduce -21.8% | 107,941 | $15.9M |
| TD Asset Management Inc | 0.01% | Reduce -35.5% | 107,858 | $15.9M |
| Legal & General Group Plc | 0.00% | Reduce -1.6% | 102,677 | $15.1M |
| Principal Financial Group Inc. | 0.01% | Reduce -0.3% | 102,184 | $15.1M |
| Alpha Wave Global, LP | 1.45% | Reduce -4.9% | 97,102 | $14.3M |
| Bellevue Group AG | 0.30% | Add +8.1% | 96,968 | $14.3M |
| Walleye Capital LLC | 0.12% | Add +106.7% | 89,363 | $13.2M |
| Swiss National Bank | 0.01% | Add +1.8% | 89,300 | $13.2M |
| Citadel Advisors | 0.01% | Add +261.4% | 87,750 | $12.9M |
| Amundi | 0.00% | Add +104.2% | 84,894 | $12.6M |
| Jupiter Asset Management Ltd. | 0.11% | New | 84,657 | $12.5M |
| GAMCO Investors | 0.12% | Reduce -0.8% | 83,800 | $12.4M |
| California Public Employees Retirement System | 0.01% | Add +7.8% | 78,460 | $11.6M |
| Barclays PLC | 0.00% | Add +38.6% | 77,804 | $11.5M |
| Swedbank AB | 0.01% | Reduce -8.5% | 67,500 | $10.0M |
| BLI - Banque de Luxembourg Investments | 0.29% | Reduce -21.0% | 68,500 | $9.8M |
| First Trust Advisors LP | 0.01% | Reduce -37.8% | 61,934 | $9.1M |
| Retirement Systems of Alabama | 0.03% | Add +1.5% | 55,831 | $8.2M |
| Alliancebernstein L.P. | 0.00% | Reduce -93.7% | 53,561 | $7.9M |
| Bridger Management, LLC | 3.80% | Add +42.2% | 47,841 | $7.1M |
| California State Teachers Retirement System | 0.01% | Add +0.0% | 43,355 | $6.4M |
| NS Partners Ltd | 0.24% | Reduce -0.4% | 42,394 | $6.3M |
| State Board of Administration of Florida Retirement System | 0.01% | Reduce -5.2% | 41,079 | $6.1M |
| New York State Teachers Retirement System | 0.01% | No change | 40,048 | $5.9M |
| Quantinno Capital Management LP | 0.02% | Reduce -67.1% | 39,589 | $5.8M |
| STRS Ohio | 0.02% | Reduce -34.1% | 36,913 | $5.4M |
| Baird Financial Group, Inc. | 0.01% | Reduce -12.0% | 35,834 | $5.3M |
| Capital Fund Management S.A. | 0.05% | New | 34,424 | $5.1M |
| Manufacturers Life Insurance Company, The | 0.00% | Reduce -41.8% | 34,193 | $5.0M |
| Victory Capital Management Inc. | 0.00% | Add +12.5% | 33,045 | $4.9M |
| Gabelli Funds LLC | 0.03% | No change | 32,700 | $4.8M |
| Nordea Investment Management AB | 0.00% | Add +2.0% | 32,499 | $4.7M |
| Tudor Investment Corporation | 0.03% | New | 31,641 | $4.7M |
| Engineers Gate Manager LP | 0.05% | Add +347.7% | 30,773 | $4.5M |
| AQR Capital Management | 0.00% | Reduce -38.3% | 31,034 | $4.4M |
| Intech Investment Management LLC | 0.04% | Reduce -6.5% | 29,690 | $4.4M |
| Onex Canada Asset Management Inc. | 0.52% | Add +239.5% | 27,923 | $4.1M |
| Storebrand Asset Management As | 0.01% | Add +56.4% | 27,732 | $4.1M |
| Ensign Peak Advisors, Inc | 0.01% | Add +71.3% | 27,361 | $4.0M |
| Wilson Asset Management (international) PTY Ltd. | 0.99% | No change | 27,234 | $4.0M |
| CANADA LIFE ASSURANCE Co | 0.01% | Add +3.8% | 27,120 | $3.9M |
| MetLife Investment Management, LLC | 0.02% | Reduce -1.7% | 25,849 | $3.8M |
| Logan Capital Management Inc. | 0.16% | Reduce -19.9% | 25,105 | $3.7M |
| Westmount Partners, LLC | 0.95% | No change | 25,866 | $3.7M |
| Advisors Asset Management, Inc. | 0.06% | Reduce -0.8% | 24,188 | $3.6M |
| New York State Common Retirement Fund | 0.00% | No change | 24,160 | $3.6M |
| South Dakota Investment Council | 0.07% | Reduce -6.9% | 23,068 | $3.4M |
| Amalgamated Bank | 0.02% | Add +4.0% | 22,601 | $3.3M |
| State of Wisconsin Investment Board | 0.01% | Add +0.4% | 21,738 | $3.2M |
| Sei Investments Co. | 0.00% | Reduce -29.0% | 21,655 | $3.2M |
"% of holder's portfolio" is MASI's weight in each manager's 13F, not the share of Masimo Corp. the manager owns.