MPWR
Monolithic Power Systems, Inc. · Technology · Semiconductors
Momentum inputs (comparable managers):
holder breadth +5.9% ·
share flow +2.6% ·
net new positions 0.0%
— formula
Broad accumulation — rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q3 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 166 | +5 | 38.17M | $52.65B | +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 | The Vanguard Group ✦ (passive) | 6.07M | +2.3% | $5.59B | 0.1% | ▲ Add | 2 | SEC ↗ ×6 |
| 2 | BlackRock ✦ (passive) | 5.73M | +9.5% | $5.27B | 0.1% | ▲ Add | 2 | SEC ↗ ×20 |
| 3 | Fidelity (FMR) ✦ | 3.56M | +5.1% | $3.28B | 0.2% | ▲ Add | 2 | SEC ↗ ×5 |
| 4 | State Street Global Advisors ✦ (passive) | 2.13M | +0.7% | $1.97B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 5 | JPMorgan Chase ✦ | 1.73M | — | $1.59B | 0.1% | n/c | 1 | SEC ↗ ×32 |
| 6 | T. Rowe Price ✦ | 1.57M | -24.7% | $1.45B | 0.2% | ▼ Trim | 6 | SEC ↗ ×2 |
| 7 | Geode Capital Management ✦ (passive) | 1.34M | +1.4% | $1.23B | 0.1% | ▲ Add | 6 | SEC ↗ ×2 |
| 8 | Morgan Stanley ✦ | 558.67K | — | $514.34M | 0.0% | n/c | 1 | SEC ↗ ×15 |
| 9 | Wellington Management ✦ | 452.94K | -35.6% | $416.99M | 0.1% | ▼ Trim | 6 | SEC ↗ ×4 |
| 10 | Goldman Sachs Group ✦ | 434.32K | — | $399.86M | 0.1% | n/c | 1 | SEC ↗ ×4 |
| 11 | Citadel Advisors ✦ | 260.47K | +3304.8% | $239.80M | 0.2% | ▲ Add | 6 | SEC ↗ ×2 |
| 12 | Millennium Management ✦ | 170.49K | +997.7% | $156.96M | 0.1% | ▲ Add | 6 | SEC ↗ |
| 13 | Marshall Wace ✦ | 132.15K | New | $121.66M | 0.1% | New | 1 | SEC ↗ ×2 |
| 14 | Adage Capital Partners ✦ | 83.15K | +9.5% | $76.55M | 0.1% | ▲ Add | 6 | SEC ↗ |
| 15 | AQR Capital Management ✦ | 37.70K | -9.0% | $34.43M | 0.0% | ▼ Trim | 6 | SEC ↗ ×6 |
| 16 | Gotham Asset Management ✦ | 19.61K | -2.6% | $18.05M | 0.1% | ▼ Trim | 6 | SEC ↗ |
| 17 | Renaissance Technologies ✦ | 8.09K | New | $7.44M | 0.0% | New | 1 | SEC ↗ |
| 18 | D. E. Shaw & Co. ✦ | 1.45K | -73.2% | $1.34M | 0.0% | ▼ Trim | 6 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Marshall Wace | $121.66M | 0.1% |
| Renaissance Technologies | $7.44M | 0.0% |
Exited
| Norges Bank | $438.01M | was 0.1% |
| Arrowstreet Capital | $3.79M | was 0.0% |
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)
Officer, Director · 130 sh · $176,402
Officer, Director · 596 sh · $788,693
Officer, Director · 2.12K sh · $2.82M
Officer, Director · 1.11K sh · $1.48M
Officer, Director · 2.95K sh · $3.95M
Officer, Director · 5.78K sh · $7.77M
Officer, Director · 6.34K sh · $8.54M
Officer, Director · 10.97K sh · $14.82M
Officer · 32 sh · $41,527
Director · 50 sh · $64,078
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology