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 179.9K
Granted 439.7K · Sold 471.3K
Granted 192.7K · Sold 250.5K
Granted 192.7K · Sold 164.7K
Granted 126.4K · Sold 118.2K
Granted 872 · Sold 3.0K
Granted 348 · Sold 3.8K
Sold 58
Granted 872 · Sold 16.0K
Granted 872 · Sold 3.2K
Granted 872 · Sold 1.4K
Granted 872 · Sold 335
Granted 872 · Sold 2.6K
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Sciammas MauriceEVP, WW Sales & Marketing · 137 transactions | — | 1.09M | 192.7K | — | 179.9K |
| Hsing MichaelCEO, Director · 232 transactions | -13.6% | 1.00M | 439.7K | — | 471.3K |
| Tseng SariaEVP & General Counsel · 105 transactions | — | 312.5K | 192.7K | — | 250.5K |
| Xiao DemingEVP, Global Operations · 43 transactions | — | 243.3K | 192.7K | — | 164.7K |
| Blegen TheodoreEVP and CFO · 257 transactions | -30.1% | 93.0K | 126.4K | — | 118.2K |
| Lee Victor KDirector · 12 transactions | -7.1% | 27.8K | 872 | — | 3.0K |
| Moyer James CDirector · 12 transactions | — | 16.4Kas of Aug 2024 | 348 | — | 3.8K |
| Dean Robert W IIInterim CFO · 5 transactions | — | 15.3K | — | — | 58 |
| Elmiger Eugen JDirector · 18 transactions | -39.2% | 12.5K | 872 | — | 16.0K |
| Zhou JeffDirector · 12 transactions | -37.9% | 3.8K | 872 | — | 3.2K |
| Martinez CarintiaDirector · 4 transactions | -33.1% | 1.1K | 872 | — | 1.4K |
| Wynne EileenDirector · 4 transactions | +114.3% | 1.0K | 872 | — | 335 |
| Chang Kuo Wei HerbertDirector · 19 transactions | -77.5% | 515 | 872 | — | 2.6K |
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 3 years: -1.21M shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.