MASI — MASIMO CORP
Reported value held$4.23B
Funds holding (latest)54
Sector—
MASI (MASIMO CORP) is tracked on HoldingsHub across five years of quarterly 13F filings. 54 funds have reported positions historically, with the sum of their latest reported stakes valued at $4.23B. No fund in our coverage reported a position in the latest filing period, which typically means the stock has fallen out of the tracked funds' portfolios rather than that it cannot be bought.
All figures on this page are computed from SEC Form 13F quarterly filings. 13F filers disclose long positions of $100,000 or more within 45 days of quarter end; short positions, options overlays and intra-quarter trades are not included, so treat the numbers as a quarterly snapshot of institutional ownership rather than real-time positioning.
| Fund | Quarter | Shares | Value | Portfolio Weight | Change |
|---|---|---|---|---|---|
| BlackRock Inc history | Q1 2026 | 4.64M | $826.13M | 0.01% | Reduce |
| Vanguard Group history | Q4 2025 | 4.35M | $565.60M | 0.01% | Reduce |
| MFS Investment Management history | Q1 2026 | 2.34M | $416.69M | 0.14% | Reduce |
| Fidelity Management & Research (FMR) history | Q1 2026 | 1.45M | $258.06M | 0.01% | Reduce |
| Millennium Management history | Q1 2026 | 1.28M | $227.22M | 0.10% | Add |
| Goldman Sachs Group history | Q1 2026 | 984.19K | $175.06M | 0.02% | Add |
| Geode Capital Management history | Q1 2026 | 956.74K | $170.21M | 0.01% | Hold |
| Balyasny Asset Management history | Q1 2026 | 856.09K | $152.27M | 0.21% | New |
| AQR Capital Management history | Q1 2026 | 831.97K | $147.40M | 0.07% | Reduce |
| Morgan Stanley history | Q1 2026 | 752.42K | $133.83M | 0.01% | Reduce |
| Citigroup Inc history | Q1 2026 | 533.39K | $94.87M | 0.04% | Add |
| Fidelity International (FIL) history | Q1 2026 | 482.00K | $85.73M | 0.07% | New |
| UBS Group AG history | Q1 2026 | 468.26K | $83.29M | 0.01% | Reduce |
| Northern Trust Corp history | Q1 2026 | 390.44K | $69.45M | 0.01% | Add |
| Charles Schwab Investment Management history | Q1 2026 | 386.90K | $68.82M | 0.01% | Add |
| Viking Global Investors history | Q4 2025 | 514.34K | $66.90M | 0.18% | Reduce |
| Farallon Capital Management history | Q4 2024 | 397.00K | $65.62M | 0.33% | Reduce |
| Capital Research Global Investors history | Q1 2026 | 359.06K | $63.87M | 0.01% | Reduce |
| Citadel Advisors history | Q1 2026 | 332.77K | $59.19M | 0.01% | Add |
| BNY Mellon history | Q1 2026 | 306.40K | $54.50M | 0.01% | Reduce |
New Positions (latest)
No fund opened a new position this quarter.
Fully Exited (vs previous quarter)
No tracked fund fully exited this quarter.
Fund Position History — shares by quarter (top 20 funds)
| Fund | Q2 2021 | Q3 2021 | Q4 2021 | Q1 2022 | Q2 2022 | Q3 2022 | Q4 2022 | Q1 2023 | Q2 2023 | Q3 2023 | Q4 2023 | Q1 2024 | Q2 2024 | Q3 2024 | Q4 2024 | Q1 2025 | Q2 2025 | Q3 2025 | Q4 2025 | Q1 2026 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| BlackRock Inc | — | — | — | — | — | — | — | — | — | — | — | — | — | 8.82M | 8.70M | 9.87M | 10.51M | 10.36M | 8.86M | 4.64M |
| MFS Investment Management | 853.86K | 845.74K | 855.58K | — | — | — | — | — | — | 1.51M | 1.61M | 1.72M | 721.73K | 792.17K | 1.74M | 1.97M | 2.47M | 2.62M | 2.66M | 2.34M |
| Fidelity Management & Research (FMR) | — | 2.08M | 2.05M | 2.07M | 2.10M | 3.86M | 5.46M | 6.08M | 7.16M | 5.25M | 6.93M | 6.98M | 4.79M | 6.76M | 8.10M | 8.18M | 8.18M | 8.21M | 7.86M | 1.45M |
| Millennium Management | — | 89.99K | 300.74K | 1.02M | 767.76K | 557.63K | 205.94K | 402.55K | 233.98K | 385.60K | 216.46K | 352.32K | 756.04K | 62.35K | 433.06K | 144.81K | 3.91K | 16.13K | 187.97K | 1.28M |
| Goldman Sachs Group | — | 159.66K | 260.05K | 445.87K | 856.66K | 728.63K | 274.06K | 62.05K | 67.94K | 124.94K | 175.51K | 122.45K | 135.09K | 332.08K | 202.25K | 280.25K | 471.52K | 744.40K | 636.70K | 984.19K |
| Geode Capital Management | — | 648.82K | 662.77K | 686.38K | 695.01K | 671.53K | 703.20K | 726.02K | 758.61K | 699.75K | 723.94K | 754.16K | 780.90K | 792.89K | 801.12K | 844.32K | 896.42K | 942.44K | 953.98K | 956.74K |
| Balyasny Asset Management | — | — | — | 57.91K | — | 16.50K | 114.34K | 87.43K | 121.79K | 614.43K | 409.94K | 255.51K | 135.72K | — | — | — | — | — | — | 856.09K |
| AQR Capital Management | — | 51.72K | 51.31K | 205.38K | 391.74K | 4.01K | — | 13.60K | 5.10K | — | — | — | — | 16.22K | 3.44K | 8.14K | 50.26K | 31.03K | 1.09M | 831.97K |
| Morgan Stanley | — | 159.49K | 162.67K | 490.42K | 1.38M | 695.84K | 483.25K | 311.26K | 270.70K | 501.90K | 458.02K | 471.46K | 475.80K | 736.86K | 737.84K | 735.78K | 767.38K | 690.60K | 920.74K | 752.42K |
| Citigroup Inc | — | 292.99K | 292.07K | 551.93K | 555.04K | 623.85K | 119.15K | 121.14K | 64.91K | 53.58K | 52.61K | 55.92K | 44.72K | 121.79K | 91.69K | 52.16K | 49.96K | 116.67K | 121.23K | 533.39K |
| Fidelity International (FIL) | — | — | — | — | — | — | — | — | — | 117.47K | 216.47K | 73.19K | 76.15K | 105.71K | 110.33K | 169.79K | 56.33K | — | — | 482.00K |
| UBS Group AG | — | 208.21K | 211.93K | 205.10K | 101.78K | 89.40K | 96.66K | 94.92K | 81.59K | 66.67K | 32.12K | 43.75K | 43.86K | 54.68K | 160.03K | 190.18K | 142.16K | 169.80K | 599.27K | 468.26K |
| Northern Trust Corp | — | 567.79K | 559.68K | 554.86K | 503.52K | 467.83K | 461.64K | 462.73K | 417.54K | 333.78K | 347.35K | 277.45K | 317.30K | 301.04K | 383.87K | 383.36K | 388.54K | 392.14K | 380.46K | 390.44K |
| Charles Schwab Investment Management | — | 293.77K | 302.42K | 317.11K | 335.42K | 333.62K | 353.65K | 357.87K | 357.13K | 347.52K | 368.04K | 378.38K | 393.29K | 370.03K | 377.84K | 377.07K | 370.73K | 364.46K | 361.90K | 386.90K |
| Capital Research Global Investors | — | — | — | — | — | — | 950.72K | 1.65M | 1.65M | 2.13M | 2.27M | 2.27M | 1.06M | 1.36M | 2.45M | 2.06M | 1.86M | 1.85M | 637.89K | 359.06K |
| Citadel Advisors | — | 45.85K | 74.12K | 197.85K | 153.16K | 201.02K | 84.61K | 206.82K | 75.73K | 889.19K | 1.07M | 1.43M | 293.79K | 253.75K | 470.43K | 62.28K | 34.08K | 101.15K | 51.25K | 332.77K |
| BNY Mellon | — | 766.99K | 725.61K | 588.80K | 710.51K | 542.37K | 538.35K | 523.46K | 497.17K | 390.62K | 415.83K | 390.93K | 389.76K | 341.96K | 337.22K | 332.11K | 317.59K | 312.62K | 308.49K | 306.40K |
| Amundi US | — | 99.43K | 104.07K | 103.00K | 99.50K | 105.57K | 114.51K | 71.43K | 57.32K | 7.17K | 6.41K | 2 | — | 24.04K | 111.48K | 41.17K | 41.58K | 84.89K | 43.86K | 243.14K |
| Renaissance Technologies | — | — | 6.20K | — | — | 47.80K | 179.70K | 81.30K | 41.23K | — | — | — | — | — | — | 15.00K | 25.38K | — | 59.90K | 239.50K |
| Bank of America Corp | — | 194.15K | 151.12K | 78.40K | 52.09K | 22.40K | 23.42K | 63.33K | 19.18K | 32.26K | 19.63K | 130.29K | 115.03K | 117.84K | 107.30K | 316.64K | 190.18K | 405.06K | 284.70K | 232.00K |