Theodore Blegen is CFO & VP at MONOLITHIC POWER SYSTEMS INC (MPWR). They have made 135 open-market trades across 1 company since 2016, most recently 2026-02-06.
CIK 0001415033
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 135 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| MPWR | 82,353 | $99.7M |
Shares reported on the most recent Form 4, priced at the 2026-02-10 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| MPWR | SELL | 2026-02-06 | 2026-02-10 | $1171.16 | $25.4M | +2.2% | -11.3% | +42.6% |
| MPWR | SELL | 2026-02-02 | 2026-02-04 | $1129.76 | $3.4M | +4.2% | -9.1% | +41.1% |
| MPWR | SELL | 2026-01-02 | 2026-01-06 | $940.47 | $2.8M | +4.3% | +16.7% | +19.2% |
| MPWR | SELL · 10b5-1 | 2025-12-01 | 2025-12-02 | $908.03 | $3.5M | -0.8% | -1.9% | +19.7% |
| MPWR | SELL · 10b5-1 | 2025-11-03 | 2025-11-04 | $1023.76 | $5.2M | -4.3% | -0.9% | +22.1% |
| MPWR | SELL · 10b5-1 | 2025-10-01 | 2025-10-01 | $913.65 | $5.2M | +5.9% | +8.4% | -0.4% |
| MPWR | SELL · 10b5-1 | 2025-09-02 | 2025-09-03 | $814.95 | $3.0M | +2.7% | +11.0% | +15.1% |
| MPWR | SELL · 10b5-1 | 2025-08-01 | 2025-08-04 | $750.00 | $2.3M | +2.3% | -0.3% | +21.0% |
| MPWR | SELL · 10b5-1 | 2025-07-01 | 2025-07-02 | $750.00 | $4.5M | -6.8% | +2.0% | +19.6% |
| MPWR | SELL | 2025-02-10 | 2025-02-12 | $717.10 | $763K | -6.9% | -13.4% | +5.5% |
| MPWR | SELL · 10b5-1 | 2024-12-09 | 2024-12-11 | $600.00 | $1.5M | +1.0% | -3.3% | -6.7% |
| MPWR | SELL | 2024-11-08 | 2024-11-13 | $765.15 | $1.1M | -0.4% | +0.9% | +15.9% |
| MPWR | SELL | 2024-11-01 | 2024-11-05 | $773.28 | $3.1M | -25.9% | -26.1% | -18.8% |
| MPWR | SELL | 2024-10-01 | 2024-10-02 | $907.04 | $3.8M | +4.2% | -16.1% | -34.6% |
| MPWR | SELL | 2024-09-03 | 2024-09-03 | $903.78 | $4.1M | +10.1% | +11.1% | -30.1% |
| MPWR | SELL | 2024-08-08 | 2024-08-12 | $778.39 | $1.1M | +8.1% | +6.6% | -22.9% |
| MPWR | SELL | 2024-08-01 | 2024-08-02 | $852.58 | $3.7M | +15.3% | +12.1% | +1.5% |
| MPWR | SELL | 2024-07-22 | 2024-07-24 | $831.58 | $4.3M | -2.2% | +18.8% | +11.3% |
| MPWR | SELL | 2024-07-01 | 2024-07-02 | $804.46 | $3.8M | +4.5% | -5.8% | +10.9% |
| MPWR | SELL | 2024-06-03 | 2024-06-05 | $705.93 | $3.4M | +9.3% | +11.2% | +10.8% |
| MPWR | SELL | 2024-05-08 | 2024-05-09 | $689.98 | $1.0M | +5.2% | +8.4% | +5.2% |
| MPWR | SELL | 2024-05-01 | 2024-05-03 | $663.46 | $1.9M | +3.1% | +1.8% | +9.2% |
| MPWR | SELL | 2024-04-01 | 2024-04-03 | $677.28 | $2.0M | -2.0% | +7.2% | +25.6% |
| MPWR | SELL | 2024-03-01 | 2024-03-04 | $726.31 | $3.1M | -4.1% | -10.0% | +1.3% |
| MPWR | SELL | 2024-02-08 | 2024-02-09 | $680.00 | $495K | -1.5% | -4.4% | -5.9% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.