$MPWR insider trading
Over the last 12 months, Monolithic Power Systems insiders reported no purchases and 56 sales totaling $645.2M across SEC Form 4 filings. 46% of those filings were made under pre-arranged 10b5-1 trading plans.
- Bought · 12m
- — 0 events
- Sold · 12m
- $645.2M 56 events
- Events · 12m
- 56 Form 4 filings, grouped
- Insiders · 12m
- 12 distinct reporters
- 10b5-1 share
- 46% of events, not dollars
All insider trades
Scroll the table sideways for price, value and marks.
| Date | Insider | Type | Shares | Avg price | Value | Δ stake | Marks |
|---|---|---|---|---|---|---|---|
| Aug 24, 2026 | DEAN ROBERT W IIInterim CFO · O | ▼ Sale | 32 | $1297.72 | $42K | -0.4% | — |
| Aug 24, 2026 | CHANG KUO WEI HERBERTD | ▼ Sale | 50 | $1281.57 | $64K | -8.8% | — |
| Aug 17, 2026 | DEAN ROBERT W IIInterim CFO · O | ▼ Sale | 6 | $1413.64 | $8K | -0.1% | — |
| Aug 11, 2026 | CHANG KUO WEI HERBERTD | ▼ Sale | 50 | $1420 | $71K | -8.1% | — |
| Aug 5, 2026 | DEAN ROBERT W IIInterim CFO · O | ▼ Sale | 105 | $1344.27 | $141K | -1.5% | — |
| Aug 3, 2026 | Sciammas MauriceEVP, WW Sales & Marketing · O | ▼ Sale | 30 | $1343.94 | $40K | -2.6% | plan · indirect |
| Jul 15, 2026 | Sciammas MauriceEVP, WW Sales & Marketing · O | ▼ Sale | 15,000 | $1349.73 | $20.2M | -9% | plan · 18 tranches |
| Jul 1, 2026 | Sciammas MauriceEVP, WW Sales & Marketing · O | ▼ Sale | 30 | $1351.61 | $41K | -2.5% | plan · indirect |
| Jun 1, 2026 | Sciammas MauriceEVP, WW Sales & Marketing · O | ▼ Sale | 30 | $1533.95 | $46K | -2.5% | plan · indirect |
| May 27, 2026 | Tseng SariaEVP & General Counsel · O | ▼ Sale | 7,565 | $1700 | $12.9M | -5% | — |
| May 26, 2026 | DEAN ROBERT W IIInterim CFO · O | ▼ Sale | 22 | $1649.56 | $36K | -0.4% | — |
| May 26, 2026 | Zhou JeffD | ▼ Sale | 486 | $1680 | $816K | -11.3% | — |
| May 22, 2026 | Tseng SariaEVP & General Counsel · O | ▼ Sale | 5,000 | $1586.43 | $7.9M | -3.2% | — |
| May 6, 2026 | Elmiger Eugen JD | ▼ Sale | 12,000 | $1584.96 | $19.0M | -69% | 9 tranches |
| May 6, 2026 | Xiao DemingEVP, Global Operations · O | ▼ Sale | 30,000 | $1654.55 | $49.6M | -12.7% | 4 tranches |
| May 6, 2026 | Wynne EileenD | ▼ Sale | 335 | $1582.68 | $530K | -25% | — |
| May 6, 2026 | Zhou JeffD | ▼ Sale | 1,514 | $1607.85 | $2.4M | -26.1% | 3 tranches |
| May 5, 2026 | Sciammas MauriceEVP, WW Sales & Marketing · O | ▼ Sale | 380 | $1583.81 | $602K | -29.3% | indirect |
| May 4, 2026 | Sciammas MauriceEVP, WW Sales & Marketing · O | ▼ Sale | 30 | $1588.73 | $48K | -2.4% | plan · indirect |
| Apr 8, 2026 | Tseng SariaEVP & General Counsel · O | ▼ Sale | 8,963 | $1305.22 | $11.7M | -5.4% | plan · 10 tranches |
| Apr 6, 2026 | Tseng SariaEVP & General Counsel · O | ▼ Sale | 7,636 | $1167.95 | $8.9M | -4.4% | plan · 8 tranches |
| Apr 1, 2026 | Tseng SariaEVP & General Counsel · O | ▼ Sale | 1,400 | $1133.52 | $1.6M | -0.8% | plan · 5 tranches |
| Apr 1, 2026 | Sciammas MauriceEVP, WW Sales & Marketing · O | ▼ Sale | 30 | $1116.44 | $33K | -2.4% | plan · indirect |
| Mar 30, 2026 | Tseng SariaEVP & General Counsel · O | ▼ Sale | 25,674 | $1010.5 | $25.9M | -12.8% | plan · 8 tranches |
| Mar 20, 2026 | Sciammas MauriceEVP, WW Sales & Marketing · O | ▼ Sale | 30 | $1095.07 | $33K | -2.3% | plan · indirect |
| Feb 12, 2026 | Hsing MichaelCEO · O·D | ▼ Sale | 33,000 | $1171.83 | $38.7M | -3.6% | plan · 12 tranches |
| Feb 11, 2026 | Hsing MichaelCEO · O·D | ▼ Sale | 33,000 | $1188.92 | $39.2M | -3.5% | plan · 10 tranches |
| Feb 11, 2026 | Sciammas MauriceEVP, WW Sales & Marketing · O | ▼ Sale | 200 | $1179.98 | $236K | -13.3% | indirect |
| Feb 10, 2026 | Hsing MichaelCEO · O·D | ▼ Sale | 34,000 | $1142.28 | $38.8M | -3.4% | plan · 9 tranches |
| Feb 9, 2026 | Lee Victor KD | ▼ Sale | 400 | $1212.16 | $485K | -1.4% | plan |
| Feb 6, 2026 | Xiao DemingEVP, Global Operations · O | ▼ Sale | 22,875 | $1171.16 | $26.8M | -8.8% | — |
| Feb 6, 2026 | Tseng SariaEVP & General Counsel · O | ▼ Sale | 22,875 | $1171.16 | $26.8M | -10.2% | — |
| Feb 6, 2026 | Sciammas MauriceEVP, WW Sales & Marketing · O | ▼ Sale | 22,875 | $1171.16 | $26.8M | -11.4% | — |
| Feb 6, 2026 | BLEGEN THEODOREEVP and CFO · O | ▼ Sale | 21,725 | $1171.16 | $25.4M | -20.9% | — |
| Feb 6, 2026 | Hsing MichaelCEO · O·D | ▼ Sale | 54,923 | $1171.16 | $64.3M | -5.3% | — |
| Feb 2, 2026 | BLEGEN THEODOREEVP and CFO · O | ▼ Sale | 3,000 | $1129.76 | $3.4M | -4.4% | plan · 17 tranches |
| Jan 2, 2026 | Lee Victor KD | ▼ Sale | 600 | $930.86 | $559K | -2.1% | plan |
| Jan 2, 2026 | BLEGEN THEODOREEVP and CFO · O | ▼ Sale | 3,000 | $940.47 | $2.8M | -4.2% | plan · 15 tranches |
| Dec 24, 2025 | Lee Victor KD | ▼ Sale | 1,000 | $951.72 | $952K | -3.4% | plan · 6 tranches |
| Dec 1, 2025 | BLEGEN THEODOREEVP and CFO · O | ▼ Sale | 3,000 | $908.21 | $2.7M | -4% | plan · 10 tranches |
| Nov 26, 2025 | Tseng SariaEVP & General Counsel · O | ▼ Sale | 20,000 | $926.47 | $18.5M | -10.7% | 9 tranches |
| Nov 25, 2025 | Tseng SariaEVP & General Counsel · O | ▼ Sale | 20,000 | $904.18 | $18.1M | -9.6% | 19 tranches |
| Nov 25, 2025 | CHANG KUO WEI HERBERTD | ▼ Sale | 100 | $896.97 | $90K | -19% | — |
| Nov 24, 2025 | Sciammas MauriceEVP, WW Sales & Marketing · O | ▼ Sale | 3,976 | $895.23 | $3.6M | -2.7% | — |
| Nov 21, 2025 | CHANG KUO WEI HERBERTD | ▼ Sale | 100 | $873.97 | $87K | -16% | — |
| Nov 19, 2025 | Sciammas MauriceEVP, WW Sales & Marketing · O | ▼ Sale | 27,966 | $881.66 | $24.7M | -15.9% | 12 tranches |
| Nov 19, 2025 | Sciammas MauriceEVP, WW Sales & Marketing · O | ▼ Sale | 7,034 | $870.21 | $6.1M | -3.8% | 12 tranches |
| Nov 12, 2025 | Hsing MichaelCEO · O·D | ▼ Sale | 37,000 | $965.52 | $35.7M | -3.9% | 19 tranches |
| Nov 11, 2025 | Hsing MichaelCEO · O·D | ▼ Sale | 40,000 | $958.39 | $38.3M | -4% | 17 tranches |
| Nov 5, 2025 | Sciammas MauriceEVP, WW Sales & Marketing · O | ▼ Sale | 200 | $986.81 | $197K | -13.3% | indirect |
Every $MPWR filing on this page is one API call away
The same Form 4 data over REST or MCP, already grouped into events with the plan flag and the dollar value read. A free key does 100 calls a day and needs no card. Prefer email? Monolithic Power Systems filings can reach your inbox instead.
Corporate insiders — officers, directors and 10%+ owners — must report their trades to the SEC on Form 4 within two business days. This page shows open-market activity: purchases (code P), sales (S) and dispositions back to the issuer (D). Scheduled compensation events such as stock grants and option exercises are also filed on Form 4 but carry no trading signal, so they are not shown and counts here can be lower than the raw EDGAR filing total. We group each filing's transactions into one economic event (a laddered 10b5-1 sale is one event, not 25 rows), flag pre-arranged plans and late filings, and link every event to its AI-scored article in the $MPWR feed.