// company-profile
Monolithic Power Systems Inc
MPWR// activity-summary
Recent insider activity is bearish. Over the last 30 days, insiders net sold $13.7M across 3 transactions.
// 90-day insight
Over the last 90 days, Monolithic Power Systems Inc insiders sold $153.2M across 36 transactions with no open-market purchases.
- Most active insider: Hsing Michael with 13 transactions totaling $59.3M.
- Largest single sale: $23.4M by Xiao Deming on May 6, 2026.
- 20% of recent sales were pre-scheduled 10b5-1 trades — typically less informative than open-market activity.
Activity skews bearish — sales outpace buys.
Institutional Ownership
Top 13F-HR holders of Monolithic Power Systems Inc as of 2026-03-31
Data source: SEC Form 13F-HR filings. Joined with insider activity above — see who's loading up institutionally while insiders are trading. Full 13F-HR API →
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jun 1, 2026 | Sciammas Maurice | MPWR | Sale10b5 | 30 | $1533.95 | $46K |
| May 29, 2026 | Sciammas Maurice | MPWR | Gift | 12,472 | $0.00 | $0K |
| May 27, 2026 | Tseng Saria | MPWR | Sale | 7,565 | $1700.00 | $12.86M |
| May 26, 2026 | DEAN ROBERT W II | MPWR | Sale | 22 | $1649.56 | $36K |
| May 26, 2026 | Zhou Jeff | MPWR | Sale | 486 | $1680.00 | $816K |
45 more transactions hidden
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