Security record · archived quarter
MASI
Masimo Corporation · Healthcare · Medical - Devices
117Tracked holders
-8Δ holders
31.18MShares held
$5.52BReported value
+10New positions
−19Exits
Momentum inputs (comparable managers):
holder breadth -6.4% ·
share flow -18.9% ·
net new positions -7.7%
— formula
Broad distribution — falling shares and fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q1 2026
Ownership over time
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q1 2026 | 117 | -8 | 31.18M | $5.52B | +10 | −19 |
| Q4 2025 | 125 | +1 | 41.01M | $5.33B | +3 | −1 |
| Q3 2025 | 19 | -2 | 29.69M | $4.38B | +1 | −4 |
| Q2 2025 | 19 | +1 | 27.33M | $4.60B | +1 | — |
| Q1 2025 | 15 | +2 | 3.43M | $572.07M | +2 | — |
| Q4 2024 | 13 | +1 | 3.93M | $649.11M | +2 | −1 |
| Q3 2024 | 11 | 0 | 1.97M | $262.13M | +2 | −2 |
| Q2 2024 | 11 | — | 3.08M | $387.70M | — | — |
Who holds it · Q1 2026
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 4.64M | -47.5% | $826.13M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 2 | BlackRock ✦ (passive) | 4.64M | -47.5% | $826.13M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 4.64M | -47.5% | $826.13M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 4 | BlackRock ✦ (passive) | 4.64M | -47.5% | $826.13M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 5 | BlackRock ✦ (passive) | 4.64M | -47.5% | $826.13M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 4.64M | -47.5% | $826.13M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 4.64M | -47.5% | $826.13M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 4.64M | -47.5% | $826.13M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 4.64M | -47.5% | $826.13M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 4.64M | -47.5% | $826.13M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 4.64M | -47.5% | $826.13M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 4.64M | -47.5% | $826.13M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 4.64M | -47.5% | $826.13M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 4.64M | -47.5% | $826.13M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 4.64M | -47.5% | $826.13M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 4.64M | -47.5% | $826.13M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 17 | BlackRock ✦ (passive) | 4.64M | -47.5% | $826.13M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 18 | Barclays Plc | 2.74M | +4602.0% | $488.07M | 0.2% | ▲ Add | 2 | SEC ↗ |
| 19 | Barclays Plc | 2.74M | +4602.0% | $488.07M | 0.2% | ▲ Add | 2 | SEC ↗ |
| 20 | Barclays Plc | 2.74M | +4602.0% | $488.07M | 0.2% | ▲ Add | 2 | SEC ↗ |
| 21 | Barclays Plc | 2.74M | +4602.0% | $488.07M | 0.2% | ▲ Add | 2 | SEC ↗ |
| 22 | Massachusetts Financial Services Co… | 2.34M | -12.1% | $416.69M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 23 | Massachusetts Financial Services Co… | 2.34M | -12.1% | $416.69M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 24 | Massachusetts Financial Services Co… | 2.34M | -12.1% | $416.69M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 25 | Massachusetts Financial Services Co… | 2.34M | -12.1% | $416.69M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 26 | Massachusetts Financial Services Co… | 2.34M | -12.1% | $416.69M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 27 | Massachusetts Financial Services Co… | 2.34M | -12.1% | $416.69M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 28 | Vanguard Capital Management Llc | 2.05M | — | $364.64M | 0.0% | n/c | 1 | SEC ↗ |
| 29 | Fidelity (FMR) ✦ | 1.45M | -81.5% | $258.06M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 30 | Fidelity (FMR) ✦ | 1.45M | -81.5% | $258.06M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 31 | Fidelity (FMR) ✦ | 1.45M | -81.5% | $258.06M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 32 | Fidelity (FMR) ✦ | 1.45M | -81.5% | $258.06M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 33 | Fidelity (FMR) ✦ | 1.45M | -81.5% | $258.06M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 34 | Fidelity (FMR) ✦ | 1.45M | -81.5% | $258.06M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 35 | State Street Global Advisors ✦ (passive) | 1.44M | +1.6% | $255.73M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 36 | Millennium Management ✦ | 988.85K | +426.1% | $175.89M | 0.1% | ▲ Add | 8 | SEC ↗ |
| 37 | Goldman Sachs Group ✦ | 984.19K | +54.6% | $175.06M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 38 | Goldman Sachs Group ✦ | 984.19K | +54.6% | $175.06M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 39 | Geode Capital Management ✦ (passive) | 956.74K | +0.3% | $170.21M | 0.0% | ▲ Add | 8 | SEC ↗ |
| 40 | Geode Capital Management ✦ (passive) | 956.74K | +0.3% | $170.21M | 0.0% | ▲ Add | 8 | SEC ↗ |
| 41 | AQR Capital Management ✦ | 831.97K | -23.8% | $147.40M | 0.1% | ▼ Trim | 7 | SEC ↗ |
| 42 | AQR Capital Management ✦ | 831.97K | -23.8% | $147.40M | 0.1% | ▼ Trim | 7 | SEC ↗ |
| 43 | AQR Capital Management ✦ | 831.97K | -23.8% | $147.40M | 0.1% | ▼ Trim | 7 | SEC ↗ |
| 44 | AQR Capital Management ✦ | 831.97K | -23.8% | $147.40M | 0.1% | ▼ Trim | 7 | SEC ↗ |
| 45 | AQR Capital Management ✦ | 831.97K | -23.8% | $147.40M | 0.1% | ▼ Trim | 7 | SEC ↗ |
| 46 | AQR Capital Management ✦ | 831.97K | -23.8% | $147.40M | 0.1% | ▼ Trim | 7 | SEC ↗ |
| 47 | AQR Capital Management ✦ | 831.97K | -23.8% | $147.40M | 0.1% | ▼ Trim | 7 | SEC ↗ |
| 48 | Balyasny Asset Management L.P. | 770.99K | New | $137.14M | 0.3% | New | 1 | SEC ↗ |
| 49 | Morgan Stanley ✦ | 752.42K | -18.3% | $133.83M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 50 | Morgan Stanley ✦ | 752.42K | -18.3% | $133.83M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 51 | Morgan Stanley ✦ | 752.42K | -18.3% | $133.83M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 52 | Morgan Stanley ✦ | 752.42K | -18.3% | $133.83M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 53 | Morgan Stanley ✦ | 752.42K | -18.3% | $133.83M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 54 | Morgan Stanley ✦ | 752.42K | -18.3% | $133.83M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 55 | Morgan Stanley ✦ | 752.42K | -18.3% | $133.83M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 56 | Morgan Stanley ✦ | 752.42K | -18.3% | $133.83M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 57 | Morgan Stanley ✦ | 752.42K | -18.3% | $133.83M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 58 | Morgan Stanley ✦ | 752.42K | -18.3% | $133.83M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 59 | Morgan Stanley ✦ | 752.42K | -18.3% | $133.83M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 60 | Morgan Stanley ✦ | 752.42K | -18.3% | $133.83M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 61 | Morgan Stanley ✦ | 752.42K | -18.3% | $133.83M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 62 | Morgan Stanley ✦ | 752.42K | -18.3% | $133.83M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 63 | Morgan Stanley ✦ | 752.42K | -18.3% | $133.83M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 64 | JPMorgan Chase ✦ | 572.64K | +386.1% | $101.54M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 65 | JPMorgan Chase ✦ | 572.64K | +386.1% | $101.54M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 66 | JPMorgan Chase ✦ | 572.64K | +386.1% | $101.54M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 67 | JPMorgan Chase ✦ | 572.64K | +386.1% | $101.54M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 68 | JPMorgan Chase ✦ | 572.64K | +386.1% | $101.54M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 69 | JPMorgan Chase ✦ | 572.64K | +386.1% | $101.54M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 70 | JPMorgan Chase ✦ | 572.64K | +386.1% | $101.54M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 71 | JPMorgan Chase ✦ | 572.64K | +386.1% | $101.54M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 72 | JPMorgan Chase ✦ | 572.64K | +386.1% | $101.54M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 73 | Citigroup Inc | 533.39K | +340.0% | $94.87M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 74 | Citigroup Inc | 533.39K | +340.0% | $94.87M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 75 | FIL Ltd | 482.00K | New | $85.73M | 0.1% | New | 1 | SEC ↗ |
| 76 | Hsbc Holdings Plc | 473.43K | New | $84.27M | 0.1% | New | 1 | SEC ↗ |
| 77 | UBS Group AG | 468.26K | -21.9% | $83.29M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 78 | UBS Group AG | 468.26K | -21.9% | $83.29M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 79 | UBS Group AG | 468.26K | -21.9% | $83.29M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 80 | Neuberger Berman Group LLC | 403.31K | +7956.5% | $71.74M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 81 | Neuberger Berman Group LLC | 403.31K | +7956.5% | $71.74M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 82 | Northern Trust Corp | 390.44K | +2.6% | $69.45M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 83 | Northern Trust Corp | 390.44K | +2.6% | $69.45M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 84 | Northern Trust Corp | 390.44K | +2.6% | $69.45M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 85 | Northern Trust Corp | 390.44K | +2.6% | $69.45M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 86 | Northern Trust Corp | 390.44K | +2.6% | $69.45M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 87 | Northern Trust Corp | 390.44K | +2.6% | $69.45M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 88 | Squarepoint Ops LLC | 389.36K | -33.3% | $69.26M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 89 | Charles Schwab Investment… | 386.90K | +6.9% | $68.82M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 90 | Capital Research Global Investors | 359.06K | -43.7% | $63.87M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 91 | Gotham Asset Management ✦ | 341.47K | -0.2% | $60.74M | 0.2% | ▼ Trim | 8 | SEC ↗ |
| 92 | Alliancebernstein L.P. | 455.35K | +739.8% | $59.22M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 93 | Corient Private Wealth LP | 321.60K | -52.8% | $57.20M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 94 | Bank of New York Mellon Corp | 306.40K | -0.7% | $54.50M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 95 | Bank of New York Mellon Corp | 306.40K | -0.7% | $54.50M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 96 | Bank of New York Mellon Corp | 306.40K | -0.7% | $54.50M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 97 | Bank of New York Mellon Corp | 306.40K | -0.7% | $54.50M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 98 | Bank of New York Mellon Corp | 306.40K | -0.7% | $54.50M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 99 | Bank of New York Mellon Corp | 306.40K | -0.7% | $54.50M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 100 | Bank of New York Mellon Corp | 306.40K | -0.7% | $54.50M | 0.0% | ▼ Trim | 2 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Balyasny Asset Management L.P. | $137.14M | 0.3% |
| FIL Ltd | $85.73M | 0.1% |
| Hsbc Holdings Plc | $84.27M | 0.1% |
Exited
| Alyeska Investment Group, L.P. | $163.79M | was 0.5% |
| Viking Global Investors | $66.90M | was 0.2% |
| Norges Bank | $49.09M | was 0.0% |
| Bamco Inc /Ny/ | $48.63M | was 0.1% |
| Td Asset Management Inc | $14.89M | was 0.0% |
| Swedbank AB | $7.74M | was 0.0% |
| Assenagon Asset Management… | $6.96M | was 0.0% |
| Nordea Investment Management… | $3.69M | was 0.0% |
| Susquehanna International… | $2.19M | was 0.0% |
| Kayne Anderson Rudnick… | $2.07M | was 0.0% |
| Sumitomo Mitsui Trust Group… | $1.90M | was 0.0% |
| Wellington Management | $1.02M | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 440 holders, 53.43M shares, $9.20B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
Frequently co-owned
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.
Provenance: Ownership from parsed 13F common-stock positions (tracked universe, comparable sets for changes); insider rows from Forms 3/4/5; stakes from Schedules 13D/13G; every filing links to its original on SEC EDGAR.
Reporting period: Q1 2026 ·
Methodology ·
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