Security record · archived quarter
MASI
Masimo Corporation · Healthcare · Medical - Devices
125Tracked holders
+1Δ holders
41.01MShares held
$5.33BReported value
+3New positions
−1Exits
Momentum inputs (comparable managers):
holder breadth +0.8% ·
share flow -4.1% ·
net new positions +1.6%
— formula
Ownership fragmentation — more holders, smaller aggregate stake
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q4 2025
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 · Q4 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 8.86M | -14.5% | $1.15B | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 2 | BlackRock ✦ (passive) | 8.86M | -14.5% | $1.15B | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 8.86M | -14.5% | $1.15B | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 4 | BlackRock ✦ (passive) | 8.86M | -14.5% | $1.15B | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 5 | BlackRock ✦ (passive) | 8.86M | -14.5% | $1.15B | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 8.86M | -14.5% | $1.15B | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 8.86M | -14.5% | $1.15B | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 8.86M | -14.5% | $1.15B | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 8.86M | -14.5% | $1.15B | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 8.86M | -14.5% | $1.15B | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 8.86M | -14.5% | $1.15B | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 8.86M | -14.5% | $1.15B | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 8.86M | -14.5% | $1.15B | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 8.86M | -14.5% | $1.15B | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 8.86M | -14.5% | $1.15B | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 8.86M | -14.5% | $1.15B | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 17 | Fidelity (FMR) ✦ | 7.86M | -4.3% | $1.02B | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 18 | Fidelity (FMR) ✦ | 7.86M | -4.3% | $1.02B | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 19 | Fidelity (FMR) ✦ | 7.86M | -4.3% | $1.02B | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 20 | Fidelity (FMR) ✦ | 7.86M | -4.3% | $1.02B | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 21 | Fidelity (FMR) ✦ | 7.86M | -4.3% | $1.02B | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 22 | Fidelity (FMR) ✦ | 7.86M | -4.3% | $1.02B | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 23 | Fidelity (FMR) ✦ | 7.86M | -4.3% | $1.02B | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 24 | The Vanguard Group ✦ (passive) | 4.35M | -9.6% | $565.60M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 25 | The Vanguard Group ✦ (passive) | 4.35M | -9.6% | $565.60M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 26 | The Vanguard Group ✦ (passive) | 4.35M | -9.6% | $565.60M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 27 | The Vanguard Group ✦ (passive) | 4.35M | -9.6% | $565.60M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 28 | The Vanguard Group ✦ (passive) | 4.35M | -9.6% | $565.60M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 29 | The Vanguard Group ✦ (passive) | 4.35M | -9.6% | $565.60M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 30 | Massachusetts Financial Services Co… | 2.66M | — | $346.46M | 0.1% | n/c | 1 | SEC ↗ |
| 31 | Massachusetts Financial Services Co… | 2.66M | — | $346.46M | 0.1% | n/c | 1 | SEC ↗ |
| 32 | Massachusetts Financial Services Co… | 2.66M | — | $346.46M | 0.1% | n/c | 1 | SEC ↗ |
| 33 | Massachusetts Financial Services Co… | 2.66M | — | $346.46M | 0.1% | n/c | 1 | SEC ↗ |
| 34 | Massachusetts Financial Services Co… | 2.66M | — | $346.46M | 0.1% | n/c | 1 | SEC ↗ |
| 35 | Massachusetts Financial Services Co… | 2.66M | — | $346.46M | 0.1% | n/c | 1 | SEC ↗ |
| 36 | State Street Global Advisors ✦ (passive) | 1.42M | -4.7% | $184.06M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 37 | Alyeska Investment Group, L.P. | 1.26M | — | $163.79M | 0.5% | n/c | 1 | SEC ↗ |
| 38 | AQR Capital Management ✦ | 1.09M | +3416.6% | $141.94M | 0.1% | ▲ Add | 6 | SEC ↗ |
| 39 | AQR Capital Management ✦ | 1.09M | +3416.6% | $141.94M | 0.1% | ▲ Add | 6 | SEC ↗ |
| 40 | AQR Capital Management ✦ | 1.09M | +3416.6% | $141.94M | 0.1% | ▲ Add | 6 | SEC ↗ |
| 41 | AQR Capital Management ✦ | 1.09M | +3416.6% | $141.94M | 0.1% | ▲ Add | 6 | SEC ↗ |
| 42 | AQR Capital Management ✦ | 1.09M | +3416.6% | $141.94M | 0.1% | ▲ Add | 6 | SEC ↗ |
| 43 | AQR Capital Management ✦ | 1.09M | +3416.6% | $141.94M | 0.1% | ▲ Add | 6 | SEC ↗ |
| 44 | Geode Capital Management ✦ (passive) | 953.98K | +1.2% | $124.10M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 45 | Geode Capital Management ✦ (passive) | 953.98K | +1.2% | $124.10M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 46 | Morgan Stanley ✦ | 920.74K | +33.3% | $119.75M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 47 | Morgan Stanley ✦ | 920.74K | +33.3% | $119.75M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 48 | Morgan Stanley ✦ | 920.74K | +33.3% | $119.75M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 49 | Morgan Stanley ✦ | 920.74K | +33.3% | $119.75M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 50 | Morgan Stanley ✦ | 920.74K | +33.3% | $119.75M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 51 | Morgan Stanley ✦ | 920.74K | +33.3% | $119.75M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 52 | Morgan Stanley ✦ | 920.74K | +33.3% | $119.75M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 53 | Morgan Stanley ✦ | 920.74K | +33.3% | $119.75M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 54 | Morgan Stanley ✦ | 920.74K | +33.3% | $119.75M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 55 | Morgan Stanley ✦ | 920.74K | +33.3% | $119.75M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 56 | Corient Private Wealth LP | 681.96K | — | $88.70M | 0.1% | n/c | 1 | SEC ↗ |
| 57 | Corient Private Wealth LP | 681.96K | — | $88.70M | 0.1% | n/c | 1 | SEC ↗ |
| 58 | Corient Private Wealth LP | 681.96K | — | $88.70M | 0.1% | n/c | 1 | SEC ↗ |
| 59 | Capital Research Global Investors | 637.89K | — | $82.96M | 0.0% | n/c | 1 | SEC ↗ |
| 60 | Goldman Sachs Group ✦ | 636.70K | -14.5% | $82.81M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 61 | Goldman Sachs Group ✦ | 636.70K | -14.5% | $82.81M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 62 | Goldman Sachs Group ✦ | 636.70K | -14.5% | $82.81M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 63 | UBS Group AG | 599.27K | — | $77.94M | 0.0% | n/c | 1 | SEC ↗ |
| 64 | UBS Group AG | 599.27K | — | $77.94M | 0.0% | n/c | 1 | SEC ↗ |
| 65 | UBS Group AG | 599.27K | — | $77.94M | 0.0% | n/c | 1 | SEC ↗ |
| 66 | UBS Group AG | 599.27K | — | $77.94M | 0.0% | n/c | 1 | SEC ↗ |
| 67 | Squarepoint Ops LLC | 583.75K | — | $75.92M | 0.2% | n/c | 1 | SEC ↗ |
| 68 | Viking Global Investors ✦ | 514.34K | -52.1% | $66.90M | 0.2% | ▼ Trim | 3 | SEC ↗ |
| 69 | Ameriprise Financial Inc | 468.41K | — | $60.92M | 0.0% | n/c | 1 | SEC ↗ |
| 70 | Ameriprise Financial Inc | 468.41K | — | $60.92M | 0.0% | n/c | 1 | SEC ↗ |
| 71 | Ameriprise Financial Inc | 468.41K | — | $60.92M | 0.0% | n/c | 1 | SEC ↗ |
| 72 | Northern Trust Corp | 380.46K | — | $49.48M | 0.0% | n/c | 1 | SEC ↗ |
| 73 | Northern Trust Corp | 380.46K | — | $49.48M | 0.0% | n/c | 1 | SEC ↗ |
| 74 | Northern Trust Corp | 380.46K | — | $49.48M | 0.0% | n/c | 1 | SEC ↗ |
| 75 | Northern Trust Corp | 380.46K | — | $49.48M | 0.0% | n/c | 1 | SEC ↗ |
| 76 | Northern Trust Corp | 380.46K | — | $49.48M | 0.0% | n/c | 1 | SEC ↗ |
| 77 | Northern Trust Corp | 380.46K | — | $49.48M | 0.0% | n/c | 1 | SEC ↗ |
| 78 | Norges Bank ✦ (passive) | 377.42K | New | $49.09M | 0.0% | New | 1 | SEC ↗ |
| 79 | Bamco Inc /Ny/ | 373.90K | — | $48.63M | 0.1% | n/c | 1 | SEC ↗ |
| 80 | Charles Schwab Investment… | 361.90K | — | $47.07M | 0.0% | n/c | 1 | SEC ↗ |
| 81 | Gotham Asset Management ✦ | 342.19K | +165.2% | $44.51M | 0.2% | ▲ Add | 7 | SEC ↗ |
| 82 | Invesco Ltd. | 319.31K | — | $41.53M | 0.0% | n/c | 1 | SEC ↗ |
| 83 | Invesco Ltd. | 319.31K | — | $41.53M | 0.0% | n/c | 1 | SEC ↗ |
| 84 | Invesco Ltd. | 319.31K | — | $41.53M | 0.0% | n/c | 1 | SEC ↗ |
| 85 | Invesco Ltd. | 319.31K | — | $41.53M | 0.0% | n/c | 1 | SEC ↗ |
| 86 | Invesco Ltd. | 319.31K | — | $41.53M | 0.0% | n/c | 1 | SEC ↗ |
| 87 | Invesco Ltd. | 319.31K | — | $41.53M | 0.0% | n/c | 1 | SEC ↗ |
| 88 | Bank of New York Mellon Corp | 308.49K | — | $40.12M | 0.0% | n/c | 1 | SEC ↗ |
| 89 | Bank of New York Mellon Corp | 308.49K | — | $40.12M | 0.0% | n/c | 1 | SEC ↗ |
| 90 | Bank of New York Mellon Corp | 308.49K | — | $40.12M | 0.0% | n/c | 1 | SEC ↗ |
| 91 | Bank of New York Mellon Corp | 308.49K | — | $40.12M | 0.0% | n/c | 1 | SEC ↗ |
| 92 | Bank of New York Mellon Corp | 308.49K | — | $40.12M | 0.0% | n/c | 1 | SEC ↗ |
| 93 | Bank of New York Mellon Corp | 308.49K | — | $40.12M | 0.0% | n/c | 1 | SEC ↗ |
| 94 | Bank of New York Mellon Corp | 308.49K | — | $40.12M | 0.0% | n/c | 1 | SEC ↗ |
| 95 | Bank of New York Mellon Corp | 308.49K | — | $40.12M | 0.0% | n/c | 1 | SEC ↗ |
| 96 | Bank of New York Mellon Corp | 308.49K | — | $40.12M | 0.0% | n/c | 1 | SEC ↗ |
| 97 | Bank of New York Mellon Corp | 308.49K | — | $40.12M | 0.0% | n/c | 1 | SEC ↗ |
| 98 | Bank of New York Mellon Corp | 308.49K | — | $40.12M | 0.0% | n/c | 1 | SEC ↗ |
| 99 | Bank of New York Mellon Corp | 308.49K | — | $40.12M | 0.0% | n/c | 1 | SEC ↗ |
| 100 | Bank of New York Mellon Corp | 308.49K | — | $40.12M | 0.0% | n/c | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Norges Bank | $49.09M | 0.0% |
Exited
| Adage Capital Partners | $22.13M | 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: Q4 2025 ·
Methodology ·
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