Security record · archived quarter
MASI
Masimo Corporation · Healthcare · Medical - Devices
19Tracked holders
+1Δ holders
27.33MShares held
$4.60BReported value
+1New positions
−0Exits
Momentum inputs (comparable managers):
holder breadth +5.6% ·
share flow +2.1% ·
net new positions +5.3%
— formula
Broad accumulation — rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 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 · Q2 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 10.51M | — | $1.77B | 0.0% | n/c | 1 | SEC ↗ |
| 2 | BlackRock ✦ (passive) | 10.51M | — | $1.77B | 0.0% | n/c | 1 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 10.51M | — | $1.77B | 0.0% | n/c | 1 | SEC ↗ |
| 4 | BlackRock ✦ (passive) | 10.51M | — | $1.77B | 0.0% | n/c | 1 | SEC ↗ |
| 5 | BlackRock ✦ (passive) | 10.51M | — | $1.77B | 0.0% | n/c | 1 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 10.51M | — | $1.77B | 0.0% | n/c | 1 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 10.51M | — | $1.77B | 0.0% | n/c | 1 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 10.51M | — | $1.77B | 0.0% | n/c | 1 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 10.51M | — | $1.77B | 0.0% | n/c | 1 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 10.51M | — | $1.77B | 0.0% | n/c | 1 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 10.51M | — | $1.77B | 0.0% | n/c | 1 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 10.51M | — | $1.77B | 0.0% | n/c | 1 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 10.51M | — | $1.77B | 0.0% | n/c | 1 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 10.51M | — | $1.77B | 0.0% | n/c | 1 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 10.51M | — | $1.77B | 0.0% | n/c | 1 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 10.51M | — | $1.77B | 0.0% | n/c | 1 | SEC ↗ |
| 17 | BlackRock ✦ (passive) | 10.51M | — | $1.77B | 0.0% | n/c | 1 | SEC ↗ |
| 18 | Fidelity (FMR) ✦ | 8.18M | — | $1.38B | 0.1% | n/c | 1 | SEC ↗ |
| 19 | Fidelity (FMR) ✦ | 8.18M | — | $1.38B | 0.1% | n/c | 1 | SEC ↗ |
| 20 | Fidelity (FMR) ✦ | 8.18M | — | $1.38B | 0.1% | n/c | 1 | SEC ↗ |
| 21 | Fidelity (FMR) ✦ | 8.18M | — | $1.38B | 0.1% | n/c | 1 | SEC ↗ |
| 22 | Fidelity (FMR) ✦ | 8.18M | — | $1.38B | 0.1% | n/c | 1 | SEC ↗ |
| 23 | Fidelity (FMR) ✦ | 8.18M | — | $1.38B | 0.1% | n/c | 1 | SEC ↗ |
| 24 | The Vanguard Group ✦ (passive) | 4.64M | — | $780.23M | 0.0% | n/c | 1 | SEC ↗ |
| 25 | The Vanguard Group ✦ (passive) | 4.64M | — | $780.23M | 0.0% | n/c | 1 | SEC ↗ |
| 26 | The Vanguard Group ✦ (passive) | 4.64M | — | $780.23M | 0.0% | n/c | 1 | SEC ↗ |
| 27 | The Vanguard Group ✦ (passive) | 4.64M | — | $780.23M | 0.0% | n/c | 1 | SEC ↗ |
| 28 | The Vanguard Group ✦ (passive) | 4.64M | — | $780.23M | 0.0% | n/c | 1 | SEC ↗ |
| 29 | The Vanguard Group ✦ (passive) | 4.64M | — | $780.23M | 0.0% | n/c | 1 | SEC ↗ |
| 30 | State Street Global Advisors ✦ (passive) | 1.49M | +0.7% | $250.04M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 31 | Geode Capital Management ✦ (passive) | 896.42K | +6.2% | $150.82M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 32 | Geode Capital Management ✦ (passive) | 896.42K | +6.2% | $150.82M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 33 | Viking Global Investors ✦ | 767.43K | New | $129.10M | 0.4% | New | 1 | SEC ↗ |
| 34 | T. Rowe Price ✦ | 405.46K | +43.5% | $68.21M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 35 | T. Rowe Price ✦ | 405.46K | +43.5% | $68.21M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 36 | Gotham Asset Management ✦ | 165.36K | +14.4% | $27.82M | 0.2% | ▲ Add | 5 | SEC ↗ |
| 37 | GAMCO Investors ✦ | 84.50K | 0.0% | $14.21M | 0.1% | Held | 5 | SEC ↗ |
| 38 | AQR Capital Management ✦ | 50.26K | +517.2% | $8.45M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 39 | AQR Capital Management ✦ | 50.26K | +517.2% | $8.45M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 40 | AQR Capital Management ✦ | 50.26K | +517.2% | $8.45M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 41 | AQR Capital Management ✦ | 50.26K | +517.2% | $8.45M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 42 | Norges Bank ✦ (passive) | 39.05K | -0.9% | $6.57M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 43 | Renaissance Technologies ✦ | 25.38K | +69.2% | $4.27M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 44 | Citadel Advisors ✦ | 24.28K | -50.9% | $4.08M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 45 | Point72 Asset Management ✦ | 24.22K | -92.3% | $4.07M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 46 | Two Sigma Investments ✦ | 15.46K | -38.5% | $2.60M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 47 | Marshall Wace ✦ | 7.21K | -34.3% | $1.21M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 48 | Marshall Wace ✦ | 7.21K | -34.3% | $1.21M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 49 | Millennium Management ✦ | 3.91K | -97.1% | $657,236 | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 50 | Wellington Management ✦ | 3.27K | +151.8% | $549,407 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 51 | Bridgewater Associates ✦ | 1.65K | -22.3% | $276,722 | 0.0% | ▼ Trim | 5 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Viking Global Investors | $129.10M | 0.4% |
Exited
| No tracked exits this quarter. |
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: Q2 2025 ·
Methodology ·
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