MPWR
MONOLITHIC POWER SYSTEMS INC
Latest Form 4:Sale$42KbyDEAN ROBERT W II (Interim CFO) · filed Aug 26, 2026
MONOLITHIC POWER SYSTEMS INC (MPWR) has 90 SEC Form 4 filings (379 transaction rows) in the rolling window, disclosed by 12 distinct insiders. Most recent filing: Aug 26, 2026.
The most active filer is EVP, WW Sales & Marketing Sciammas Maurice with 14 filings. Insiders have net sold $240.9M over the trailing 6 months.
- Industry:Semiconductors
- CEO:Michael R. Hsing
- Employees:4,017
- HQ:West Palm Beach, FL, US
- IPO:2004-11-19
Insider Buying
$0
reported purchases (SEC code P)
Insider Selling
$729.0M
reported sales (SEC code S)
Unique Insiders
12
in the rolling window
Market Cap
$61.7B
latest known value
| Source | ||||||
|---|---|---|---|---|---|---|
| Interim CFO | Sale | 32 | $42K | Aug 26 | SEC ↗ | |
| Director | Sale | 50 | $64K | Aug 25 | SEC ↗ | |
| Interim CFO | Sale | 6 | $8K | Aug 20 | SEC ↗ | |
CHANG KUO WEI HERBERTFirst in 9 months | Director | Sale | 50 | $71K | Aug 13 | SEC ↗ |
| Interim CFO | Sale | 105 | $141K | Aug 6 | SEC ↗ | |
| EVP, WW Sales & Marketing | Sale | 30 | $40K | Aug 5 | SEC ↗ | |
| EVP, WW Sales & Marketing | Sale | 15,000 | $20.2M | Jul 17 | SEC ↗ | |
| EVP, WW Sales & Marketing | Sale | 30 | $41K | Jul 6 | SEC ↗ | |
| EVP, WW Sales & Marketing | Sale | 30 | $46K | Jun 3 | SEC ↗ | |
| EVP & General Counsel | Sale | 7,565 | $12.9M | May 29 | SEC ↗ | |
| Interim CFO | Sale | 22 | $36K | May 28 | SEC ↗ | |
| Director | Sale | 486 | $816K | May 27 | SEC ↗ | |
| EVP & General Counsel | Sale | 5,000 | $7.9M | May 27 | SEC ↗ | |
DEAN ROBERT W IIFirst filing | Interim CFO | Sale | 4 | $6K | May 20 | SEC ↗ |
Hsing MichaelFirst in 3 months | CEO | Sale | 40,000 | $59.3M | May 20 | SEC ↗ |
| EVP, WW Sales & Marketing | Sale | 12,000 | $18.7M | May 19 | SEC ↗ | |
Elmiger Eugen JFirst in 8 months | Director | Sale | 12,000 | $19.0M | May 8 | SEC ↗ |
| EVP, Global Operations | Sale | 30,000 | $49.6M | May 8 | SEC ↗ | |
Wynne EileenFirst filing | Director | Sale | 335 | $530K | May 8 | SEC ↗ |
Zhou JeffFirst filing | Director | Sale | 1,014 | $1.6M | May 6 | SEC ↗ |
Zhou JeffFirst filing | Director | Sale | 500 | $825K | May 6 | SEC ↗ |
| EVP, WW Sales & Marketing | Sale | 380 | $602K | May 6 | SEC ↗ | |
| EVP, WW Sales & Marketing | Sale | 30 | $48K | May 6 | SEC ↗ | |
| EVP & General Counsel | Sale | 8,963 | $11.7M | Apr 10 | SEC ↗ | |
| EVP & General Counsel | Sale | 7,636 | $8.9M | Apr 8 | SEC ↗ | |
| EVP & General Counsel | Sale | 1,400 | $1.6M | Apr 3 | SEC ↗ | |
| EVP, WW Sales & Marketing | Sale | 30 | $33K | Apr 3 | SEC ↗ | |
| EVP & General Counsel | Sale | 25,674 | $25.9M | Apr 1 | SEC ↗ | |
| EVP, WW Sales & Marketing | Sale | 30 | $33K | Mar 24 | SEC ↗ | |
| CEO | Sale | 33,000 | $38.7M | Feb 17 | SEC ↗ | |
| CEO | Sale | 33,000 | $39.2M | Feb 13 | SEC ↗ | |
| CEO | Sale | 34,000 | $38.8M | Feb 12 | SEC ↗ | |
| EVP, WW Sales & Marketing | Sale | 200 | $236K | Feb 12 | SEC ↗ | |
| Director | Sale | 400 | $485K | Feb 11 | SEC ↗ | |
| EVP & General Counsel | Sale | 22,875 | $26.8M | Feb 10 | SEC ↗ | |
Xiao DemingFirst filing | EVP, Global Operations | Sale | 22,875 | $26.8M | Feb 10 | SEC ↗ |
| CEO | Sale | 54,923 | $64.3M | Feb 10 | SEC ↗ | |
| EVP, WW Sales & Marketing | Sale | 22,875 | $26.8M | Feb 10 | SEC ↗ | |
| EVP and CFO | Sale | 21,725 | $25.4M | Feb 10 | SEC ↗ | |
| EVP and CFO | Sale | 3,000 | $3.4M | Feb 4 | SEC ↗ | |
| EVP and CFO | Sale | 3,000 | $2.8M | Jan 6 | SEC ↗ | |
| Director | Sale | 600 | $559K | Jan 6 | SEC ↗ | |
Lee Victor KFirst filing | Director | Sale | 1,000 | $952K | Dec 29 | SEC ↗ |
| EVP and CFO | Sale | 3,000 | $2.7M | Dec 2 | SEC ↗ | |
| EVP & General Counsel | Sale | 20,000 | $18.1M | Nov 28 | SEC ↗ | |
| EVP & General Counsel | Sale | 20,000 | $18.5M | Nov 28 | SEC ↗ | |
| Director | Sale | 100 | $90K | Nov 25 | SEC ↗ | |
| EVP, WW Sales & Marketing | Sale | 3,976 | $3.6M | Nov 25 | SEC ↗ | |
CHANG KUO WEI HERBERTFirst filing | Director | Sale | 100 | $87K | Nov 24 | SEC ↗ |
| EVP, WW Sales & Marketing | Sale | 35,000 | $30.8M | Nov 20 | SEC ↗ | |
Hsing MichaelFirst filing | CEO | Sale | 40,000 | $38.3M | Nov 13 | SEC ↗ |
Hsing MichaelFirst filing | CEO | Sale | 37,000 | $35.7M | Nov 13 | SEC ↗ |
Sciammas MauriceFirst filing | EVP, WW Sales & Marketing | Sale | 200 | $197K | Nov 6 | SEC ↗ |
| EVP and CFO | Sale | 3,000 | $3.1M | Nov 4 | SEC ↗ | |
| EVP & General Counsel | Sale | 1,300 | $1.4M | Oct 24 | SEC ↗ | |
| EVP & General Counsel | Sale | 14,028 | $14.3M | Oct 17 | SEC ↗ | |
| EVP & General Counsel | Sale | 2,812 | $2.9M | Oct 17 | SEC ↗ | |
| EVP and CFO | Sale | 3,000 | $2.7M | Oct 1 | SEC ↗ | |
Martinez CarintiaFirst filing | Director | Sale | 1,400 | $1.3M | Sep 23 | SEC ↗ |
Tseng SariaFirst filing | EVP & General Counsel | Sale | 14,510 | $13.3M | Sep 23 | SEC ↗ |
BLEGEN THEODOREFirst filing | EVP and CFO | Sale | 3,000 | $2.4M | Sep 3 | SEC ↗ |
Elmiger Eugen JFirst filing | Director | Sale | 4,000 | $3.4M | Sep 2 | SEC ↗ |
Congress trading MPWR
See timeline →- RRep. Byron DonaldsSale$1,001 - $15,0002026-06-05
- RRep. Byron DonaldsSale$1,001 - $15,0002026-06-05
STOCK Act disclosures are filed up to 45 days after the trade. Amount is a disclosed range, not an exact figure.
Related companies
MONOLITHIC POWER SYSTEMS INC is in the Technology sector.