MPWR insider trading — Monolithic Power Systems, Inc.
Over the last 90 days, insiders at Monolithic Power Systems, Inc. (MPWR) made 0 open-market purchases worth $0 and 5 open-market sales worth $326K, making them net sellers by $326K. The largest sale was by Dean Robert W Ii (Interim CFO), who sold 105 shares for $141K on Aug 5, 2026.
Updated Oct 16, 2026.
Recent MPWR insider transactions
Every Form 4 filed by Monolithic Power Systems, Inc. officers, directors and 10% owners in the last 90 days, newest first. P = open-market purchase, S = open-market sale; other codes are awards, option exercises, tax withholding or gifts.
| Trade date | Insider | Role | Type | Ownership | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|---|
| Sep 28, 2026 | Hsing Michael | CEO | S · Sale · 10b5-1 | Direct | 30,000 | $1,344.97 | $40.35M | Form 4 |
| Aug 31, 2026 | Tseng Saria | EVP & General Counsel | G · Gift | Direct | 2,000 | — | — | Form 4 |
| Aug 31, 2026 | Tseng Saria | EVP & General Counsel | G · Gift | Indirect | 2,000 | — | — | Form 4 |
| Aug 24, 2026 | Dean Robert W Ii | Interim CFO | S · Sale | Direct | 32 | $1,297.72 | $42K | Form 4 |
| Aug 24, 2026 | Dean Robert W Ii | Interim CFO | J · Other | Direct | 5 | — | — | Form 4 |
| Aug 24, 2026 | Chang Kuo Wei Herbert | Director | S · Sale | Direct | 50 | $1,281.57 | $64K | Form 4 |
| Aug 17, 2026 | Dean Robert W Ii | Interim CFO | S · Sale | Direct | 6 | $1,413.64 | $8K | Form 4 |
| Aug 11, 2026 | Chang Kuo Wei Herbert | Director | S · Sale | Direct | 50 | $1,420.00 | $71K | Form 4 |
| Aug 4, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | G · Gift | Direct | 25,000 | — | — | Form 4 |
| Aug 4, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | G · Gift | Indirect | 25,000 | — | — | Form 4 |
| Aug 5, 2026 | Dean Robert W Ii | Interim CFO | S · Sale | Direct | 105 | $1,344.27 | $141K | Form 4 |
| Aug 3, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S · Sale · 10b5-1 | Indirect | 30 | $1,343.94 | $40K | Form 4 |
| Jul 25, 2026 | Dean Robert W Ii | Interim CFO | A · Grant/award | Direct | 1,359 | — | — | Form 4 |
MPWR insider trading FAQ
Are insiders buying MPWR stock?
Not on the open market. In the last 90 days, Monolithic Power Systems, Inc. insiders made no open-market purchases, and 5 open-market sales totaling $326K. Purchases with the insider's own money are generally seen as a stronger signal than sales, which happen for many reasons (taxes, diversification, planned 10b5-1 sales).
Who are the insiders trading MPWR?
Recent sellers: Chang Kuo Wei Herbert, Dean Robert W Ii.
Where does MPWR insider trading data come from?
Every transaction comes from SEC Form 4 filings on EDGAR. Company officers, directors and 10% owners must file a Form 4 within two business days of buying or selling. InsiderBolt reads these filings directly from the SEC.
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Insider trading data is for informational purposes only and is not investment advice. Filings can be amended; always confirm details on SEC EDGAR.