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.
Granted 192.7K · Sold 74.8K
Granted 439.7K · Sold 271.9K
Granted 192.7K · Sold 151.8K
Granted 192.7K · Sold 52.9K
Granted 126.4K · Sold 39.7K
Granted 189 · Sold 2.0K
Sold 58
Granted 189 · Sold 16.0K
Granted 189 · Sold 2.0K
Granted 189 · Sold 1.4K
Granted 189 · Sold 335
Granted 189 · Sold 250
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Sciammas MauriceEVP, WW Sales & Marketing · 49 transactions | — | 1.09M | 192.7K | — | 74.8K |
| Hsing MichaelCEO, Director · 85 transactions | +3.9% | 1.00M | 439.7K | — | 271.9K |
| Tseng SariaEVP & General Counsel · 73 transactions | — | 312.5K | 192.7K | — | 151.8K |
| Xiao DemingEVP, Global Operations · 8 transactions | +67.2% | 243.3K | 192.7K | — | 52.9K |
| Blegen TheodoreEVP and CFO · 95 transactions | +70.4% | 93.0K | 126.4K | — | 39.7K |
| Lee Victor KDirector · 9 transactions | -6.1% | 27.8K | 189 | — | 2.0K |
| Dean Robert W IIInterim CFO · 5 transactions | — | 15.3K | — | — | 58 |
| Elmiger Eugen JDirector · 16 transactions | -41.2% | 12.5K | 189 | — | 16.0K |
| Zhou JeffDirector · 5 transactions | -32.3% | 3.8K | 189 | — | 2.0K |
| Martinez CarintiaDirector · 2 transactions | -53.2% | 1.1K | 189 | — | 1.4K |
| Wynne EileenDirector · 2 transactions | -12.7% | 1.0K | 189 | — | 335 |
| Chang Kuo Wei HerbertDirector · 4 transactions | -17.7% | 515 | 189 | — | 250 |
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 year: -613.1K shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.