MasimoMASI
13F holders, Q4 2025 (December 31)392holders +34
72new positions
49sold out
12famous investors
$130.08avg. 13F price*
At the end of Q4 2025, 392 institutions reported holding Masimo Corp. (MASI) in their 13F filings, up 34 from Q3 2025. 72 opened new positions and 49 sold out. The largest holders were BlackRock, Inc. ($1.2B), FMR LLC ($1.0B) and Politan Capital Management LP ($596.9M). 12 famous investors held it, including Andreas Halvorsen (0.2% of Viking Global Investors's portfolio), Joel Greenblatt (0.2% of Gotham Asset Management's portfolio) and Ron Baron (0.1% of Baron Capital (BAMCO)'s portfolio).
- Company
- Masimo Corp.
- CUSIP
- 574795100
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 72 | $373.6M |
| Exits | 49 | $176.7M |
All 13F filers, Q3 2025 → Q4 2025: 6,411,555 shares bought and 7,642,777 shares sold, net −1,231,222 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 392 holders
| BlackRock, Inc. | 0.02% | Reduce -14.5% | 8,855,619 | $1.2B |
| FMR LLC | 0.05% | Reduce -4.3% | 7,864,164 | $1.0B |
| Politan Capital Management LP | 71.01% | No change | 4,589,648 | $596.9M |
| Vanguard Group Inc. | 0.01% | Reduce -9.6% | 4,348,786 | $565.6M |
| Massachusetts Financial Services Co. | 0.11% | Add +1.7% | 2,663,875 | $346.5M |
| T. Rowe Price Investment Management, Inc. | 0.19% | Add +9.6% | 2,330,158 | $303.1M |
| Naya Capital Management UK Ltd. | 15.28% | New | 1,560,697 | $203.0M |
| Westfield Capital Management Co. LP | 0.82% | Add +7.2% | 1,522,049 | $198.0M |
| State Street Corp. | 0.01% | Reduce -4.7% | 1,415,196 | $184.1M |
| Alyeska Investment Group, L.P. | 0.46% | Reduce -8.8% | 1,259,307 | $163.8M |
| AQR Capital Management | 0.07% | Add +3416.6% | 1,091,326 | $141.9M |
| Geode Capital Management, LLC | 0.01% | Add +1.2% | 953,976 | $124.1M |
| Morgan Stanley | 0.01% | Add +33.3% | 920,735 | $119.8M |
| RTW Investments, LP | 0.89% | No change | 683,294 | $88.9M |
| Capital Research Global Investors | 0.02% | Reduce -65.6% | 637,894 | $83.0M |
| Goldman Sachs Group Inc. | 0.01% | Reduce -14.5% | 636,698 | $82.8M |
| Liontrust Investment Partners LLP | 1.21% | Reduce -7.9% | 627,796 | $81.7M |
| UBS Group AG | 0.02% | Add +252.9% | 599,274 | $77.9M |
| Squarepoint Ops LLC | 0.15% | Reduce -6.0% | 583,747 | $75.9M |
| Viking Global Investors | 0.18% | Reduce -52.1% | 514,340 | $66.9M |
| Schroder Investment Management Group | 0.05% | Add +41.3% | 475,504 | $62.3M |
| Ameriprise Financial Inc. | 0.01% | Add +1.6% | 468,407 | $60.9M |
| Northern Trust Corp. | 0.01% | Reduce -3.0% | 380,464 | $49.5M |
| Norges Bank | 0.01% | — | 377,421 | $49.1M |
| Baron Capital (BAMCO) | 0.13% | Reduce -3.8% | 373,899 | $48.6M |
| Charles Schwab Investment Management Inc. | 0.01% | Reduce -0.7% | 361,896 | $47.1M |
| Gotham Asset Management | 0.16% | Add +165.2% | 342,194 | $44.5M |
| Corient Private Wealth LP | 0.06% | Add +1.2% | 340,230 | $44.3M |
| Invesco Ltd. | 0.00% | Reduce -0.6% | 319,308 | $41.5M |
| Bank of New York Mellon Corp | 0.01% | Reduce -1.3% | 308,485 | $40.1M |
| Qube Research & Technologies Ltd | 0.05% | New | 293,536 | $38.2M |
| Bank of America Corp. | 0.00% | Reduce -29.7% | 284,702 | $37.0M |
| Schonfeld Strategic Advisors LLC | 0.17% | Add +2335.1% | 265,036 | $34.5M |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 0.03% | Add +41.0% | 232,565 | $30.2M |
| Nuveen, LLC | 0.01% | Reduce -0.7% | 224,068 | $29.1M |
| Marshall Wace, LLP | 0.03% | Add +63.5% | 219,312 | $28.5M |
| T. Rowe Price Associates Inc. | 0.00% | Reduce -58.5% | 213,594 | $27.8M |
| Parkman Healthcare Partners LLC | 2.48% | New | 200,000 | $26.0M |
| Erste Asset Management GmbH | 0.22% | Add +25.0% | 200,000 | $26.0M |
| Millennium Management | 0.02% | Add +1065.2% | 187,965 | $24.4M |
| Raymond James Financial Inc. | 0.01% | Reduce -4.8% | 186,510 | $24.3M |
| American Century Companies Inc. | 0.01% | Add +6.2% | 178,758 | $23.2M |
| Dimensional Fund Advisors LP | 0.00% | Reduce -33.0% | 173,950 | $22.6M |
| Man Group plc | 0.04% | New | 147,416 | $19.2M |
| GMO | 0.05% | Reduce -40.8% | 143,825 | $18.7M |
| DF Dent & Co. Inc. | 0.27% | Add +31.3% | 142,626 | $18.6M |
| Rhumbline Advisers | 0.01% | Reduce -1.6% | 124,556 | $16.2M |
| Citigroup Inc. | 0.01% | Add +3.9% | 121,231 | $15.8M |
| GW&K Investment Management, LLC | 0.13% | Reduce -3.8% | 119,362 | $15.5M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Add +9.0% | 118,964 | $15.5M |
| JPMorgan Chase & Co. | 0.00% | Add +9.1% | 117,798 | $15.3M |
| TD Asset Management Inc | 0.01% | Add +6.2% | 114,514 | $14.9M |
| Jane Street Group, LLC | 0.02% | New | 102,881 | $13.4M |
| Principal Financial Group Inc. | 0.01% | Reduce -4.2% | 97,858 | $12.7M |
| Bellevue Group AG | 0.24% | Add +0.3% | 97,285 | $12.7M |
| HRT Financial LP | 0.04% | New | 92,776 | $12.1M |
| Legal & General Group Plc | 0.00% | Reduce -10.0% | 92,436 | $12.0M |
| Swiss National Bank | 0.01% | Add +2.0% | 91,100 | $11.8M |
| Rockefeller Capital Management L.P. | 0.02% | Reduce -41.4% | 86,411 | $11.2M |
| Tidal Investments LLC | 0.05% | Reduce -35.6% | 85,294 | $11.1M |
| Engineers Gate Manager LP | 0.13% | Add +171.2% | 83,458 | $10.9M |
| GAMCO Investors | 0.10% | Reduce -0.9% | 83,000 | $10.8M |
| Alpha Wave Global, LP | 1.20% | Reduce -22.2% | 75,552 | $9.8M |
| D. E. Shaw & Co. | 0.01% | New | 66,016 | $8.6M |
| California Public Employees Retirement System | 0.00% | Reduce -19.3% | 63,359 | $8.2M |
| Renaissance Technologies | 0.01% | New | 59,900 | $7.8M |
| Swedbank AB | 0.01% | Reduce -11.8% | 59,500 | $7.7M |
| Barclays PLC | 0.00% | Reduce -25.0% | 58,358 | $7.6M |
| Quantbot Technologies LP | 0.25% | New | 56,925 | $7.4M |
| Retirement Systems of Alabama | 0.02% | Reduce -1.9% | 54,795 | $7.1M |
| Alliancebernstein L.P. | 0.00% | Add +1.2% | 54,223 | $7.1M |
| Assenagon Asset Management S.A. | 0.01% | Add +2078.5% | 53,525 | $7.0M |
| Verition Fund Management LLC | 0.04% | Add +463.9% | 53,020 | $6.9M |
| BLI - Banque de Luxembourg Investments | 0.19% | Reduce -28.7% | 48,839 | $6.4M |
| Capital Fund Management S.A. | 0.06% | Add +38.2% | 47,586 | $6.2M |
| Sofinnova Investments, Inc. | 0.26% | New | 46,201 | $6.0M |
| Amundi | 0.00% | Reduce -48.3% | 43,860 | $5.7M |
| California State Teachers Retirement System | 0.01% | Add +1.1% | 43,823 | $5.7M |
| Citadel Advisors | 0.00% | Reduce -50.9% | 43,052 | $5.6M |
| NS Partners Ltd | 0.22% | Reduce -0.1% | 42,348 | $5.5M |
| Walleye Capital LLC | 0.03% | Reduce -53.0% | 42,049 | $5.5M |
| New York State Teachers Retirement System | 0.01% | No change | 40,048 | $5.2M |
| State Board of Administration of Florida Retirement System | 0.01% | Reduce -3.2% | 39,749 | $5.2M |
| Voloridge Investment Management, LLC | 0.02% | Add +1281.7% | 39,557 | $5.1M |
| Wilson Asset Management (international) PTY Ltd. | 1.32% | Add +44.8% | 39,437 | $5.1M |
| Canada Pension Plan Investment Board | 0.00% | Add +143.7% | 38,500 | $5.0M |
| STRS Ohio | 0.02% | Add +0.0% | 36,915 | $4.8M |
| Manufacturers Life Insurance Company, The | 0.00% | Reduce -3.0% | 33,184 | $4.3M |
| Gabelli Funds LLC | 0.03% | No change | 32,700 | $4.3M |
| Baird Financial Group, Inc. | 0.01% | Reduce -14.4% | 30,679 | $4.0M |
| Nordea Investment Management AB | 0.00% | Reduce -12.9% | 28,319 | $3.7M |
| Campbell & CO Investment Adviser LLC | 0.17% | New | 27,783 | $3.6M |
| Storebrand Asset Management As | 0.01% | Reduce -0.1% | 27,714 | $3.6M |
| CANADA LIFE ASSURANCE Co | 0.01% | Reduce -1.9% | 26,610 | $3.5M |
| Logan Capital Management Inc. | 0.15% | Add +5.6% | 26,505 | $3.4M |
| Onex Canada Asset Management Inc. | 0.47% | Reduce -7.6% | 25,805 | $3.4M |
| Intech Investment Management LLC | 0.03% | Reduce -16.6% | 24,765 | $3.2M |
| MetLife Investment Management, LLC | 0.02% | Reduce -5.3% | 24,472 | $3.2M |
| Westmount Partners, LLC | 0.79% | Reduce -6.3% | 24,232 | $3.2M |
| New York State Common Retirement Fund | 0.00% | No change | 24,160 | $3.1M |
"% of holder's portfolio" is MASI's weight in each manager's 13F, not the share of Masimo Corp. the manager owns.