Form4.ai tracks every SEC insider trade in real time. See every MPWR insider filing with a free account — no card.
See every MPWR insider filing — free account, no card.
Free accountMONOLITHIC POWER SYSTEMS, INC. (MPWR) has 8 SEC Form 4 insider filings on record in the last 90 days. No insider purchases were filed — 6 sales totalling $40.7M. Most recent filing: Sept. 30, 2026.
Open-market value, last 90 days
Form 4 filings by type, last 90 days
| Date | Insider | Trade | Value | Price since buy |
|---|---|---|---|---|
| Sep 30, 2026 SEC filing | Hsing Michael CEO | Sold | $40,349,047 | — |
| Sep 2, 2026 SEC filing | Tseng Saria EVP & General Counsel | Gift | — | — |
| Aug 26, 2026 SEC filing | DEAN ROBERT W II Interim CFO | Sold | $41,527 | — |
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Form 4 is the filing company officers, directors and 10% shareholders must submit to the SEC within two business days of trading their own company's stock. Open-market purchases generally carry more signal than sales, which are often scheduled in advance. More on how this works.