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 275.8K · Sold 291.7K
Granted 734.1K · Sold 738.2K
Granted 275.8K · Sold 332.9K
Granted 275.8K · Sold 279.3K
Granted 182.2K · Sold 182.2K
Granted 1.9K · Sold 3.0K
Granted 1.4K · Sold 55.6K
Sold 58
Granted 1.9K · Sold 16.0K
Granted 1.9K · Sold 3.6K
Granted 1.9K · Sold 1.4K
Granted 1.3K · Sold 335
Granted 1.9K · Sold 2.6K
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Sciammas MauriceEVP, WW Sales & Marketing · 192 transactions | — | 1.09M | 275.8K | — | 291.7K |
| Hsing MichaelCEO, Director · 265 transactions | -11.5% | 1.00M | 734.1K | — | 738.2K |
| Tseng SariaEVP & General Counsel · 138 transactions | — | 312.5K | 275.8K | — | 332.9K |
| Xiao DemingEVP, Global Operations · 86 transactions | — | 243.3K | 275.8K | — | 279.3K |
| Blegen TheodoreEVP and CFO · 352 transactions | -34.1% | 93.0K | 182.2K | — | 182.2K |
| Lee Victor KDirector · 14 transactions | -3.9% | 27.8K | 1.9K | — | 3.0K |
| Moyer James CDirector · 40 transactions | — | 16.4Kas of Aug 2024 | 1.4K | — | 55.6K |
| Dean Robert W IIInterim CFO · 5 transactions | — | 15.3K | — | — | 58 |
| Elmiger Eugen JDirector · 20 transactions | -36.1% | 12.5K | 1.9K | — | 16.0K |
| Zhou JeffDirector · 16 transactions | -31% | 3.8K | 1.9K | — | 3.6K |
| Martinez CarintiaDirector · 6 transactions | +83% | 1.1K | 1.9K | — | 1.4K |
| Wynne EileenDirector · 5 transactions | — | 1.0K | 1.3K | — | 335 |
| Chang Kuo Wei HerbertDirector · 21 transactions | -59.8% | 515 | 1.9K | — | 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 5 years: -1.91M shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.