MasimoMASI
13F holders, Q4 2024 (December 31)365holders +3
45new positions
49sold out
8famous investors
$165.36avg. 13F price*
At the end of Q4 2024, 365 institutions reported holding Masimo Corp. (MASI) in their 13F filings, up 3 from Q3 2024. 45 opened new positions and 49 sold out. The largest holders were BlackRock, Inc. ($1.4B), FMR LLC ($1.3B) and Politan Capital Management LP ($779.3M). 8 famous investors held it, including Joel Greenblatt (0.2% of Gotham Asset Management's portfolio), Mario Gabelli (0.1% of GAMCO Investors'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 2024 → Q4 2024
| Institutions | Total Value | |
|---|---|---|
| New Positions | 45 | $117.2M |
| Exits | 49 | $145.9M |
All 13F filers, Q3 2024 → Q4 2024: 7,933,172 shares bought and 6,820,140 shares sold, net +1,113,032 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 365 holders
| BlackRock, Inc. | 0.03% | Reduce -1.4% | 8,698,213 | $1.4B |
| FMR LLC | 0.08% | Add +19.8% | 8,097,454 | $1.3B |
| Politan Capital Management LP | 50.51% | No change | 4,714,746 | $779.3M |
| Vanguard Group Inc. | 0.01% | Add +1.5% | 4,586,702 | $758.2M |
| Capital Research Global Investors | 0.08% | Add +80.5% | 2,454,975 | $405.8M |
| Massachusetts Financial Services Co. | 0.09% | Add +119.0% | 1,735,167 | $286.8M |
| T. Rowe Price Investment Management, Inc. | 0.17% | Add +8.9% | 1,662,376 | $274.8M |
| State Street Corp. | 0.01% | Add +1.7% | 1,463,466 | $241.9M |
| Alliancebernstein L.P. | 0.05% | Add +1276.9% | 947,391 | $156.6M |
| Holocene Advisors, LP | 0.45% | Reduce -4.5% | 835,660 | $138.1M |
| Geode Capital Management, LLC | 0.01% | Add +1.0% | 801,125 | $132.5M |
| Liontrust Investment Partners LLP | 1.90% | Reduce -1.9% | 792,935 | $131.1M |
| Westfield Capital Management Co. LP | 0.55% | Reduce -44.9% | 768,858 | $127.1M |
| Morgan Stanley | 0.01% | Add +0.1% | 737,841 | $122.0M |
| RTW Investments, LP | 1.71% | Reduce -53.3% | 683,294 | $112.9M |
| Dimensional Fund Advisors LP | 0.03% | Add +8.4% | 647,720 | $107.1M |
| Alyeska Investment Group, L.P. | 0.36% | Reduce -22.3% | 578,635 | $95.6M |
| Schroder Investment Management Group | 0.09% | Reduce -22.7% | 566,469 | $95.5M |
| Citadel Advisors | 0.07% | Add +132.7% | 441,025 | $72.9M |
| Millennium Management | 0.06% | Add +1294.9% | 408,058 | $67.5M |
| Farallon Capital Management, L.L.C. | 0.35% | Reduce -68.5% | 397,000 | $65.6M |
| Northern Trust Corp. | 0.01% | Add +27.5% | 383,869 | $63.5M |
| Charles Schwab Investment Management Inc. | 0.01% | Add +2.1% | 377,836 | $62.5M |
| Sumitomo Mitsui Trust Group, Inc. | 0.04% | Add +0.4% | 373,705 | $61.8M |
| Corient Private Wealth LP | 0.10% | Add +8847.1% | 347,683 | $57.5M |
| Bank of New York Mellon Corp | 0.01% | Reduce -1.4% | 337,221 | $55.7M |
| Baron Capital (BAMCO) | 0.13% | Reduce -11.5% | 307,144 | $50.8M |
| Invesco Ltd. | 0.01% | Add +226.4% | 277,960 | $45.9M |
| T. Rowe Price Associates Inc. | 0.00% | Add +259.7% | 250,786 | $41.5M |
| Point72 Asset Management | 0.12% | New | 248,499 | $41.1M |
| Cramer Rosenthal McGlynn LLC | 2.08% | Add +20.4% | 222,817 | $36.8M |
| Assenagon Asset Management S.A. | 0.06% | Add +916.1% | 216,051 | $35.7M |
| Ameriprise Financial Inc. | 0.01% | Add +8.1% | 215,946 | $35.7M |
| Raymond James Financial Inc. | 0.01% | — | 203,971 | $33.7M |
| Goldman Sachs Group Inc. | 0.01% | Reduce -39.1% | 202,252 | $33.4M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.01% | Add +69.2% | 190,246 | $31.4M |
| UBS Group AG | 0.01% | Add +192.7% | 160,028 | $26.5M |
| Comerica Bank | 0.09% | Reduce -42.3% | 141,378 | $23.4M |
| Neuberger Berman Group LLC | 0.02% | Add +3114.4% | 138,122 | $22.8M |
| JPMorgan Chase & Co. | 0.00% | Reduce -17.5% | 128,639 | $21.3M |
| Gotham Asset Management | 0.20% | Reduce -16.8% | 127,780 | $21.1M |
| Rhumbline Advisers | 0.02% | Reduce -2.1% | 124,373 | $20.6M |
| Amundi | 0.01% | Add +363.8% | 111,481 | $18.8M |
| FIL Ltd | 0.02% | Add +4.4% | 110,332 | $18.2M |
| Bank of America Corp. | 0.00% | Reduce -8.9% | 107,303 | $17.7M |
| BLI - Banque de Luxembourg Investments | 0.46% | — | 101,200 | $17.1M |
| Principal Financial Group Inc. | 0.01% | Add +0.1% | 102,660 | $17.0M |
| Legal & General Group Plc | 0.00% | Add +3.3% | 97,187 | $16.1M |
| Great Lakes Advisors, LLC | 0.14% | New | 95,730 | $15.8M |
| Citigroup Inc. | 0.01% | Add +47.7% | 91,691 | $15.2M |
| Rockefeller Capital Management L.P. | 0.04% | Reduce -33.8% | 90,901 | $15.0M |
| Swiss National Bank | 0.01% | Add +1.3% | 89,400 | $14.8M |
| Catalio Capital Management, LP | 3.16% | — | 87,377 | $14.4M |
| Tidal Investments LLC | 0.12% | Add +3530.4% | 86,731 | $14.3M |
| TD Asset Management Inc | 0.01% | Add +82.8% | 84,640 | $14.0M |
| GAMCO Investors | 0.15% | No change | 84,500 | $14.0M |
| Erste Asset Management GmbH | 0.17% | Add +50.3% | 82,652 | $13.9M |
| Nuveen Asset Management, LLC | 0.00% | Reduce -9.5% | 75,754 | $12.5M |
| California Public Employees Retirement System | 0.01% | Reduce -4.2% | 70,229 | $11.6M |
| Man Group plc | 0.03% | Reduce -83.8% | 64,889 | $10.7M |
| Point72 (DIFC) Ltd | 0.87% | New | 58,417 | $9.7M |
| Walleye Capital LLC | 0.10% | Add +22.4% | 54,938 | $9.1M |
| Retirement Systems of Alabama | 0.03% | Reduce -52.7% | 54,035 | $8.9M |
| Barclays PLC | 0.00% | Add +33.2% | 53,219 | $8.8M |
| Federated Hermes, Inc. | 0.02% | Reduce -55.5% | 52,734 | $8.7M |
| Manufacturers Life Insurance Company, The | 0.01% | Add +40.9% | 51,457 | $8.5M |
| Woodline Partners LP | 0.06% | Add +450.4% | 51,185 | $8.5M |
| Corebridge Financial, Inc. | 0.05% | Reduce -3.7% | 50,536 | $8.4M |
| Allspring Global Investments Holdings, LLC | 0.01% | Add +1936.9% | 48,764 | $8.2M |
| Logan Capital Management Inc. | 0.33% | Reduce -5.1% | 47,787 | $7.9M |
| Ace Management Global Ltd. | 100.00% | Reduce -95.1% | 47,694 | $7.9M |
| First Trust Advisors LP | 0.01% | Add +780.4% | 47,328 | $7.8M |
| Montanaro Asset Management Ltd | 1.59% | Reduce -16.5% | 46,500 | $7.7M |
| New York State Teachers Retirement System | 0.02% | Reduce -0.4% | 45,248 | $7.5M |
| State Board of Administration of Florida Retirement System | 0.01% | Reduce -0.1% | 42,861 | $7.1M |
| NS Partners Ltd | 0.29% | Reduce -0.9% | 42,649 | $7.0M |
| Picton Mahoney Asset Management | 0.27% | Add +194.7% | 42,610 | $7.0M |
| LMR Partners LLP | 0.16% | New | 42,448 | $7.0M |
| California State Teachers Retirement System | 0.01% | Reduce -0.5% | 42,383 | $7.0M |
| Two Sigma Investments, LP | 0.02% | Reduce -88.4% | 39,889 | $6.6M |
| CANADA LIFE ASSURANCE Co | 0.01% | No change | 37,560 | $6.2M |
| Onex Canada Asset Management Inc. | 0.73% | Add +156.9% | 37,061 | $6.1M |
| Atika Capital Management LLC | 0.79% | New | 36,800 | $6.1M |
| Baird Financial Group, Inc. | 0.01% | Add +369.5% | 34,198 | $5.7M |
| Norges Bank | 0.00% | Reduce -86.9% | 33,394 | $5.5M |
| Gabelli Funds LLC | 0.04% | No change | 33,000 | $5.5M |
| O'shaughnessy Asset Management, LLC | 0.04% | New | 31,375 | $5.2M |
| Envestnet Asset Management Inc. | 0.00% | Add +17.3% | 31,107 | $5.1M |
| South Dakota Investment Council | 0.10% | No change | 30,611 | $5.1M |
| Jane Street Group, LLC | 0.01% | Add +23.5% | 30,487 | $5.0M |
| Royal Bank of Canada | 0.00% | Add +125.2% | 30,371 | $5.0M |
| Zacks Investment Management | 0.04% | Add +2.5% | 27,229 | $4.5M |
| Sei Investments Co. | 0.01% | Reduce -5.3% | 26,601 | $4.4M |
| Sterling Capital Management LLC | 0.06% | Reduce -36.0% | 26,221 | $4.3M |
| MetLife Investment Management, LLC | 0.02% | Add +9.3% | 26,026 | $4.3M |
| Westmount Partners, LLC | 1.31% | No change | 25,991 | $4.3M |
| Intech Investment Management LLC | 0.04% | Add +171.3% | 25,622 | $4.2M |
| ExodusPoint Capital Management, LP | 0.04% | New | 25,426 | $4.2M |
| Cinctive Capital Management LP | 0.22% | New | 25,176 | $4.2M |
| Bellevue Group AG | 0.08% | New | 24,166 | $4.0M |
"% of holder's portfolio" is MASI's weight in each manager's 13F, not the share of Masimo Corp. the manager owns.