SEC Form 4 · Updated Daily
MPWR
— MONOLITHIC POWER SYSTEMS, INC. OwnershipInsider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| Hsing Michael | Director · Officer | 848,263 | 2026-05-18 | S |
| Xiao Deming | Officer | 205,959 | 2026-05-06 | S |
| BLEGEN THEODORE | Officer | 82,353 | 2026-02-06 | S |
| Sciammas Maurice | Officer | 36,062 | 2026-08-04 | G |
| Lee Victor K | Director | 27,756 | 2026-02-09 | S |
| DEAN ROBERT W II | Officer | 7,089 | 2026-08-24 | J |
| Elmiger Eugen J | Director | 5,402 | 2026-05-06 | S |
| Zhou Jeff | Director | 3,800 | 2026-05-26 | S |
| Tseng Saria | Officer | 2,000 | 2026-08-31 | G |
| Wynne Eileen | Director | 1,007 | 2026-05-06 | S |
| CHANG KUO WEI HERBERT | Director | 515 | 2026-08-24 | S |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-08-31 | Tseng Saria | Gift | 2,000 | $0.00 | 2,000 |
| 2026-08-31 | Tseng Saria | Gift | 2,000 | $0.00 | 142,218 |
| 2026-08-24 | CHANG KUO WEI HERBERT | Open-market sale | 50 | $1281.57 | 515 |
| 2026-08-24 | DEAN ROBERT W II | J | 5 | $0.00 | 7,089 |
| 2026-08-24 | DEAN ROBERT W II | Open-market sale | 32 | $1297.72 | 7,094 |
| 2026-08-17 | DEAN ROBERT W II | Open-market sale | 6 | $1413.64 | 7,126 |
| 2026-08-11 | CHANG KUO WEI HERBERT | Open-market sale | 50 | $1420.00 | 565 |
| 2026-08-05 | DEAN ROBERT W II | Open-market sale | 105 | $1344.27 | 7,132 |
| 2026-08-04 | Sciammas Maurice | Gift | 25,000 | $0.00 | 36,062 |
| 2026-08-04 | Sciammas Maurice | Gift | 25,000 | $0.00 | 126,644 |
| 2026-08-03 | Sciammas Maurice | Open-market sale | 30 | $1343.94 | 1,119 |
| 2026-07-25 | DEAN ROBERT W II | Grant / award | 1,359 | $0.00 | 7,237 |
| 2026-07-15 | Sciammas Maurice | Open-market sale | 110 | $1405.71 | 151,644 |
| 2026-07-15 | Sciammas Maurice | Open-market sale | 117 | $1400.45 | 151,754 |
| 2026-07-15 | Sciammas Maurice | Open-market sale | 213 | $1396.16 | 151,871 |
| 2026-07-15 | Sciammas Maurice | Open-market sale | 50 | $1388.19 | 152,084 |
| 2026-07-15 | Sciammas Maurice | Open-market sale | 410 | $1384.11 | 152,134 |
| 2026-07-15 | Sciammas Maurice | Open-market sale | 418 | $1378.73 | 152,544 |
| 2026-07-15 | Sciammas Maurice | Open-market sale | 472 | $1375.47 | 152,962 |
| 2026-07-15 | Sciammas Maurice | Open-market sale | 240 | $1369.18 | 153,434 |
| 2026-07-15 | Sciammas Maurice | Open-market sale | 50 | $1359.36 | 153,674 |
| 2026-07-15 | Sciammas Maurice | Open-market sale | 5,640 | $1352.95 | 153,724 |
| 2026-07-15 | Sciammas Maurice | Open-market sale | 1,506 | $1348.91 | 159,364 |
| 2026-07-15 | Sciammas Maurice | Open-market sale | 1,864 | $1344.16 | 160,870 |
| 2026-07-15 | Sciammas Maurice | Open-market sale | 1,460 | $1339.59 | 162,734 |
| 2026-07-15 | Sciammas Maurice | Open-market sale | 776 | $1334.59 | 164,194 |
| 2026-07-15 | Sciammas Maurice | Open-market sale | 464 | $1329.30 | 164,970 |
| 2026-07-15 | Sciammas Maurice | Open-market sale | 409 | $1323.93 | 165,434 |
| 2026-07-15 | Sciammas Maurice | Open-market sale | 274 | $1318.42 | 165,843 |
| 2026-07-15 | Sciammas Maurice | Open-market sale | 527 | $1314.03 | 166,117 |
| 2026-07-01 | Sciammas Maurice | Open-market sale | 30 | $1351.61 | 1,149 |
| 2026-06-01 | Sciammas Maurice | Open-market sale | 30 | $1533.95 | 1,179 |
| 2026-05-29 | Sciammas Maurice | Gift | 12,472 | $0.00 | 12,625 |
| 2026-05-27 | Tseng Saria | Open-market sale | 7,565 | $1700.00 | 144,218 |
| 2026-05-26 | Zhou Jeff | Open-market sale | 486 | $1680.00 | 3,800 |
| 2026-05-26 | DEAN ROBERT W II | Open-market sale | 22 | $1649.56 | 5,878 |
| 2026-05-22 | Tseng Saria | Open-market sale | 5,000 | $1586.43 | 151,783 |
| 2026-05-22 | Tseng Saria | Gift | 200 | $0.00 | 156,783 |
| 2026-05-18 | DEAN ROBERT W II | Open-market sale | 4 | $1563.28 | 5,900 |
| 2026-05-18 | Hsing Michael | Open-market sale | 130 | $1521.43 | 848,263 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.