Security record · archived quarter
MASI
Masimo Corporation · Healthcare · Medical - Devices
19Tracked holders
-2Δ holders
29.69MShares held
$4.38BReported value
+1New positions
−4Exits
Momentum inputs (comparable managers):
holder breadth -9.5% ·
share flow +2.6% ·
net new positions -15.8%
— formula
Concentrated accumulation — rising shares among fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q3 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 · Q3 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 10.36M | -1.4% | $1.53B | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 2 | BlackRock ✦ (passive) | 10.36M | -1.4% | $1.53B | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 10.36M | -1.4% | $1.53B | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 4 | BlackRock ✦ (passive) | 10.36M | -1.4% | $1.53B | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 5 | BlackRock ✦ (passive) | 10.36M | -1.4% | $1.53B | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 10.36M | -1.4% | $1.53B | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 10.36M | -1.4% | $1.53B | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 10.36M | -1.4% | $1.53B | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 10.36M | -1.4% | $1.53B | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 10.36M | -1.4% | $1.53B | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 10.36M | -1.4% | $1.53B | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 10.36M | -1.4% | $1.53B | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 10.36M | -1.4% | $1.53B | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 10.36M | -1.4% | $1.53B | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 10.36M | -1.4% | $1.53B | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 10.36M | -1.4% | $1.53B | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 17 | Fidelity (FMR) ✦ | 8.21M | +0.4% | $1.21B | 0.1% | ▲ Add | 2 | SEC ↗ |
| 18 | Fidelity (FMR) ✦ | 8.21M | +0.4% | $1.21B | 0.1% | ▲ Add | 2 | SEC ↗ |
| 19 | Fidelity (FMR) ✦ | 8.21M | +0.4% | $1.21B | 0.1% | ▲ Add | 2 | SEC ↗ |
| 20 | Fidelity (FMR) ✦ | 8.21M | +0.4% | $1.21B | 0.1% | ▲ Add | 2 | SEC ↗ |
| 21 | Fidelity (FMR) ✦ | 8.21M | +0.4% | $1.21B | 0.1% | ▲ Add | 2 | SEC ↗ |
| 22 | Fidelity (FMR) ✦ | 8.21M | +0.4% | $1.21B | 0.1% | ▲ Add | 2 | SEC ↗ |
| 23 | Fidelity (FMR) ✦ | 8.21M | +0.4% | $1.21B | 0.1% | ▲ Add | 2 | SEC ↗ |
| 24 | The Vanguard Group ✦ (passive) | 4.81M | +3.7% | $709.72M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 25 | The Vanguard Group ✦ (passive) | 4.81M | +3.7% | $709.72M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 26 | The Vanguard Group ✦ (passive) | 4.81M | +3.7% | $709.72M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 27 | The Vanguard Group ✦ (passive) | 4.81M | +3.7% | $709.72M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 28 | The Vanguard Group ✦ (passive) | 4.81M | +3.7% | $709.72M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 29 | The Vanguard Group ✦ (passive) | 4.81M | +3.7% | $709.72M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 30 | State Street Global Advisors ✦ (passive) | 1.48M | -0.1% | $219.03M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 31 | Viking Global Investors ✦ | 1.07M | +39.9% | $158.39M | 0.4% | ▲ Add | 2 | SEC ↗ |
| 32 | Geode Capital Management ✦ (passive) | 942.44K | +5.1% | $139.08M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 33 | Geode Capital Management ✦ (passive) | 942.44K | +5.1% | $139.08M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 34 | Goldman Sachs Group ✦ | 744.40K | — | $109.84M | 0.0% | n/c | 1 | SEC ↗ |
| 35 | Goldman Sachs Group ✦ | 744.40K | — | $109.84M | 0.0% | n/c | 1 | SEC ↗ |
| 36 | Morgan Stanley ✦ | 690.60K | — | $101.90M | 0.0% | n/c | 1 | SEC ↗ |
| 37 | Morgan Stanley ✦ | 690.60K | — | $101.90M | 0.0% | n/c | 1 | SEC ↗ |
| 38 | Morgan Stanley ✦ | 690.60K | — | $101.90M | 0.0% | n/c | 1 | SEC ↗ |
| 39 | Morgan Stanley ✦ | 690.60K | — | $101.90M | 0.0% | n/c | 1 | SEC ↗ |
| 40 | Morgan Stanley ✦ | 690.60K | — | $101.90M | 0.0% | n/c | 1 | SEC ↗ |
| 41 | Morgan Stanley ✦ | 690.60K | — | $101.90M | 0.0% | n/c | 1 | SEC ↗ |
| 42 | Morgan Stanley ✦ | 690.60K | — | $101.90M | 0.0% | n/c | 1 | SEC ↗ |
| 43 | Morgan Stanley ✦ | 690.60K | — | $101.90M | 0.0% | n/c | 1 | SEC ↗ |
| 44 | Morgan Stanley ✦ | 690.60K | — | $101.90M | 0.0% | n/c | 1 | SEC ↗ |
| 45 | Morgan Stanley ✦ | 690.60K | — | $101.90M | 0.0% | n/c | 1 | SEC ↗ |
| 46 | T. Rowe Price ✦ | 514.95K | +27.0% | $75.98M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 47 | T. Rowe Price ✦ | 514.95K | +27.0% | $75.98M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 48 | JPMorgan Chase ✦ | 215.88K | — | $31.85M | 0.0% | n/c | 1 | SEC ↗ |
| 49 | JPMorgan Chase ✦ | 215.88K | — | $31.85M | 0.0% | n/c | 1 | SEC ↗ |
| 50 | JPMorgan Chase ✦ | 215.88K | — | $31.85M | 0.0% | n/c | 1 | SEC ↗ |
| 51 | JPMorgan Chase ✦ | 215.88K | — | $31.85M | 0.0% | n/c | 1 | SEC ↗ |
| 52 | JPMorgan Chase ✦ | 215.88K | — | $31.85M | 0.0% | n/c | 1 | SEC ↗ |
| 53 | JPMorgan Chase ✦ | 215.88K | — | $31.85M | 0.0% | n/c | 1 | SEC ↗ |
| 54 | JPMorgan Chase ✦ | 215.88K | — | $31.85M | 0.0% | n/c | 1 | SEC ↗ |
| 55 | JPMorgan Chase ✦ | 215.88K | — | $31.85M | 0.0% | n/c | 1 | SEC ↗ |
| 56 | JPMorgan Chase ✦ | 215.88K | — | $31.85M | 0.0% | n/c | 1 | SEC ↗ |
| 57 | JPMorgan Chase ✦ | 215.88K | — | $31.85M | 0.0% | n/c | 1 | SEC ↗ |
| 58 | JPMorgan Chase ✦ | 215.88K | — | $31.85M | 0.0% | n/c | 1 | SEC ↗ |
| 59 | JPMorgan Chase ✦ | 215.88K | — | $31.85M | 0.0% | n/c | 1 | SEC ↗ |
| 60 | JPMorgan Chase ✦ | 215.88K | — | $31.85M | 0.0% | n/c | 1 | SEC ↗ |
| 61 | JPMorgan Chase ✦ | 215.88K | — | $31.85M | 0.0% | n/c | 1 | SEC ↗ |
| 62 | Adage Capital Partners ✦ | 150.00K | New | $22.13M | 0.0% | New | 1 | SEC ↗ |
| 63 | Marshall Wace ✦ | 134.12K | +1760.7% | $19.79M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 64 | Marshall Wace ✦ | 134.12K | +1760.7% | $19.79M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 65 | Marshall Wace ✦ | 134.12K | +1760.7% | $19.79M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 66 | Gotham Asset Management ✦ | 129.03K | -22.0% | $19.04M | 0.1% | ▼ Trim | 6 | SEC ↗ |
| 67 | Citadel Advisors ✦ | 87.75K | +261.4% | $12.95M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 68 | Citadel Advisors ✦ | 87.75K | +261.4% | $12.95M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 69 | GAMCO Investors ✦ | 83.80K | -0.8% | $12.36M | 0.1% | ▼ Trim | 6 | SEC ↗ |
| 70 | AQR Capital Management ✦ | 31.03K | -38.2% | $4.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 71 | AQR Capital Management ✦ | 31.03K | -38.2% | $4.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 72 | AQR Capital Management ✦ | 31.03K | -38.2% | $4.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 73 | AQR Capital Management ✦ | 31.03K | -38.2% | $4.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 74 | Millennium Management ✦ | 16.13K | +312.9% | $2.38M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 75 | Wellington Management ✦ | 2.19K | -32.8% | $323,725 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 76 | Bridgewater Associates ✦ | 1.71K | +4.2% | $252,901 | 0.0% | ▲ Add | 6 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Adage Capital Partners | $22.13M | 0.0% |
Exited
| Norges Bank | $6.57M | was 0.0% |
| Renaissance Technologies | $4.27M | was 0.0% |
| Point72 Asset Management | $4.07M | was 0.0% |
| Two Sigma Investments | $2.60M | 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: Q3 2025 ·
Methodology ·
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