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 1.94M · Sold 1.96M
Granted 5.86M · Sold 5.84M
Granted 309.6K · Sold 314.1K
Granted 1.53M · Sold 1.31M
Granted 615.7K · Sold 338.1K
Granted 2.26M · Sold 1.98M
Granted 414.4K · Sold 322.5K
Granted 291.4K · Sold 259.9K
Granted 145.2K · Sold 117.5K
Granted 120.1K · Sold 97.1K
Granted 89.0K · Sold 101.7K
Granted 391.1K · Sold 1.70M
Sold 58
Granted 21.2K · Sold 16.0K
Granted 107.6K · Sold 101.9K
Granted 72.8K · Sold 69.0K
Granted 2.5K · Sold 1.4K
Granted 1.3K · Sold 335
Granted 218.8K · Sold 2.41M
Granted 117.0K · Sold 117.0K
Granted 60.0K · Sold 60.0K
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Sciammas MauriceEVP, WW Sales & Marketing · 823 transactions | — | 1.09M | 1.94M | — | 1.96M |
| Hsing MichaelCEO, Director · 1711 transactions | — | 1.00M | 5.86M | — | 5.84M |
| Ueunten PaulSr. V.P. Design Engineering · 98 transactions | — | 429.5Kas of Feb 2013 | 309.6K | — | 314.1K |
| Tseng SariaEVP & General Counsel · 494 transactions | — | 312.5K | 1.53M | — | 1.31M |
| Rao MeeraCFO · 175 transactions | — | 243.5Kas of Feb 2016 | 615.7K | — | 338.1K |
| Xiao DemingEVP, Global Operations · 639 transactions | — | 243.3K | 2.26M | — | 1.98M |
| Blegen TheodoreEVP and CFO · 521 transactions | — | 93.0K | 414.4K | — | 322.5K |
| Neely RickSr. VP and CFO · 117 transactions | — | 44.6Kas of Dec 2010 | 291.4K | — | 259.9K |
| Lee Victor KDirector · 90 transactions | — | 27.8K | 145.2K | — | 117.5K |
| Smith- Pilkington Karen ADirector · 19 transactions | — | 23.0Kas of Apr 2016 | 120.1K | — | 97.1K |
| Chiocchi AdrianaSenior V.P. and CLO · 26 transactions | — | 19.9Kas of Oct 2009 | 89.0K | — | 101.7K |
| Moyer James CDirector · 1865 transactions | — | 16.4Kas of Aug 2024 | 391.1K | — | 1.70M |
| Dean Robert W IIInterim CFO · 5 transactions | — | 15.3K | — | — | 58 |
| Elmiger Eugen JDirector · 29 transactions | — | 12.5K | 21.2K | — | 16.0K |
| Padval UmeshDirector · 24 transactions | — | 5.7Kas of Feb 2011 | 107.6K | — | 101.9K |
| Zhou JeffDirector · 80 transactions | — | 3.8K | 72.8K | — | 69.0K |
| Martinez CarintiaDirector · 7 transactions | — | 1.1K | 2.5K | — | 1.4K |
| Wynne EileenDirector · 5 transactions | — | 1.0K | 1.3K | — | 335 |
| Chang Kuo Wei HerbertDirector · 172 transactions | — | 515 | 218.8K | — | 2.41M |
| McBurnie Douglas MDirector · 27 transactions | — | 0as of May 2014 | 117.0K | — | 117.0K |
| Earhart Alan LDirector · 14 transactions | — | 0as of Aug 2008 | 60.0K | — | 60.0K |
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 all recorded history: -17.13M shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.