MASI
Masimo Corporation · Healthcare · Medical - Devices
Momentum inputs (comparable managers):
holder breadth +15.4% ·
share flow -12.5% ·
net new positions +13.3%
— formula
Ownership fragmentation — more holders, smaller aggregate stake
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q1 2025
| 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 | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | State Street Global Advisors ✦ (passive) | 1.48M | +0.9% | $245.90M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 2 | Geode Capital Management ✦ (passive) | 844.32K | +5.4% | $140.70M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 3 | Geode Capital Management ✦ (passive) | 844.32K | +5.4% | $140.70M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 4 | Point72 Asset Management ✦ | 315.42K | +26.9% | $52.55M | 0.2% | ▲ Add | 2 | SEC ↗ |
| 5 | T. Rowe Price ✦ | 282.64K | +12.7% | $47.09M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 6 | T. Rowe Price ✦ | 282.64K | +12.7% | $47.09M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 7 | Gotham Asset Management ✦ | 144.59K | +13.2% | $24.09M | 0.2% | ▲ Add | 4 | SEC ↗ |
| 8 | Millennium Management ✦ | 134.81K | -67.0% | $22.46M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 9 | GAMCO Investors ✦ | 84.50K | 0.0% | $14.08M | 0.2% | Held | 4 | SEC ↗ |
| 10 | Citadel Advisors ✦ | 49.48K | -88.8% | $8.24M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 11 | Norges Bank ✦ (passive) | 39.41K | +18.0% | $6.57M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 12 | Two Sigma Investments ✦ | 25.16K | -36.9% | $4.19M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 13 | Renaissance Technologies ✦ | 15.00K | New | $2.50M | 0.0% | New | 1 | SEC ↗ |
| 14 | Marshall Wace ✦ | 10.97K | -17.4% | $1.83M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 15 | Marshall Wace ✦ | 10.97K | -17.4% | $1.83M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 16 | AQR Capital Management ✦ | 8.14K | +136.6% | $1.30M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 17 | AQR Capital Management ✦ | 8.14K | +136.6% | $1.30M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 18 | AQR Capital Management ✦ | 8.14K | +136.6% | $1.30M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 19 | AQR Capital Management ✦ | 8.14K | +136.6% | $1.30M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 20 | Bridgewater Associates ✦ | 2.12K | -81.4% | $352,859 | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 21 | Wellington Management ✦ | 1.30K | New | $216,080 | 0.0% | New | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Renaissance Technologies | $2.50M | 0.0% |
| Wellington Management | $216,080 | 0.0% |
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.
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.