MPWR
Monolithic Power Systems, Inc. · Technology · Semiconductors
Momentum inputs (comparable managers):
holder breadth +18.2% ·
share flow +4.2% ·
net new positions +15.4%
— formula
Broad accumulation — rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q4 2024
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 166 | +5 | 38.15M | $52.59B | +8 | −2 |
| Q1 2026 | 163 | +3 | 37.39M | $40.78B | +6 | −4 |
| Q4 2025 | 159 | 0 | 43.73M | $37.89B | +3 | −2 |
| Q3 2025 | 18 | +1 | 24.30M | $22.37B | +2 | −2 |
| Q2 2025 | 15 | -3 | 21.56M | $15.77B | — | −3 |
| Q1 2025 | 15 | +2 | 7.50M | $4.35B | +2 | — |
| Q4 2024 | 13 | +2 | 7.31M | $4.33B | +2 | — |
| Q3 2024 | 10 | -2 | 4.86M | $4.49B | — | −2 |
| Q2 2024 | 12 | — | 4.81M | $3.95B | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | State Street Global Advisors ✦ (passive) | 2.16M | — | $1.28B | 0.1% | n/c | 1 | SEC ↗ |
| 2 | T. Rowe Price ✦ | 1.53M | +16.3% | $904.30M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 3 | T. Rowe Price ✦ | 1.53M | +16.3% | $904.30M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 4 | Geode Capital Management ✦ (passive) | 1.37M | +2.4% | $807.16M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 5 | Geode Capital Management ✦ (passive) | 1.37M | +2.4% | $807.16M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 6 | Wellington Management ✦ | 853.03K | -22.8% | $504.74M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 7 | Wellington Management ✦ | 853.03K | -22.8% | $504.74M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 8 | Wellington Management ✦ | 853.03K | -22.8% | $504.74M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 9 | Norges Bank ✦ (passive) | 834.56K | +12.6% | $493.81M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 10 | Citadel Advisors ✦ | 131.11K | +5469.7% | $77.58M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 11 | Citadel Advisors ✦ | 131.11K | +5469.7% | $77.58M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 12 | Millennium Management ✦ | 124.57K | -21.6% | $73.71M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 13 | Marshall Wace ✦ | 104.73K | New | $61.97M | 0.1% | New | 1 | SEC ↗ |
| 14 | Marshall Wace ✦ | 104.73K | New | $61.97M | 0.1% | New | 1 | SEC ↗ |
| 15 | Adage Capital Partners ✦ | 93.60K | +31.8% | $55.38M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 16 | AQR Capital Management ✦ | 88.63K | +9.8% | $52.44M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 17 | AQR Capital Management ✦ | 88.63K | +9.8% | $52.44M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 18 | AQR Capital Management ✦ | 88.63K | +9.8% | $52.44M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 19 | AQR Capital Management ✦ | 88.63K | +9.8% | $52.44M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 20 | AQR Capital Management ✦ | 88.63K | +9.8% | $52.44M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 21 | Gotham Asset Management ✦ | 15.38K | -16.9% | $9.10M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 22 | D. E. Shaw & Co. ✦ | 12.31K | -59.4% | $7.28M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 23 | D. E. Shaw & Co. ✦ | 12.31K | -59.4% | $7.28M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 24 | Arrowstreet Capital ✦ | 768 | New | $454,426 | 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
| Marshall Wace | $61.97M | 0.1% |
| Marshall Wace | $61.97M | 0.1% |
| Arrowstreet Capital | $454,426 | 0.0% |
Exited
| No tracked exits this quarter. |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 1,109 holders, 45.61M shares, $45.88B 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.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Director · 50 sh · $64,078
Officer · 6 sh · $8,482
Director · 50 sh · $71,000
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology