Monolithic Power Systems Inc
A fabless chipmaker that designs the power-management chips found inside cloud servers, AI systems, cars, and consumer gadgets. Its "monolithic" approach packs an entire power system—transistors and control logic—onto a single chip, making devices smaller and more energy-efficient. Founded in 1997 by engineer Michael Hsing, who named the company for that very idea of building a whole power system on one piece of silicon rather than wiring many separate parts together.
Sold 12.5K
Sold 40.0K
Sold 56.2K
Sold 30.0K
Sold 58
Sold 12.0K
Sold 2.0K
Sold 335
Sold 50
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Sciammas MauriceEVP, WW Sales & Marketing · 16 transactions | — | 1.09M | — | — | 12.5K |
| Hsing MichaelCEO, Director · 13 transactions | -3.8% | 1.00M | — | — | 40.0K |
| Tseng SariaEVP & General Counsel · 34 transactions | -15.3% | 312.5K | — | — | 56.2K |
| Xiao DemingEVP, Global Operations · 4 transactions | -6.7% | 243.3K | — | — | 30.0K |
| Dean Robert W IIInterim CFO · 5 transactions | — | 15.3K | — | — | 58 |
| Elmiger Eugen JDirector · 9 transactions | -28.3% | 12.5K | — | — | 12.0K |
| Zhou JeffDirector · 4 transactions | -34.5% | 3.8K | — | — | 2.0K |
| Wynne EileenDirector · 1 transaction | -25% | 1.0K | — | — | 335 |
| Chang Kuo Wei HerbertDirector · 1 transaction | -16.3% | 515 | — | — | 50 |
Select a row to see that insider’s individual transactions. Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.
Net open-market activity over the last 6 months: -153.2K shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.