Monolithic Power (MPWR) insider trading
11 directors and officers declare holding shares of Monolithic Power (MPWR), each in their own filing with the SEC. The largest is Michael Hsing (CEO · Director) with 964,129 shares, 2.0% of the company, worth $1.3B at the last close. The most recent move on file: Michael Hsing sold 30,000 shares at $1,323.31 on Sep 28, 2026. Of the 11 with a trade on file, 1 last bought and 10 last sold. Purchases and sales are as reported on Forms 3, 4 and 5 — the SEC counts private transactions too, and many large sales follow a plan arranged in advance. Holdings are never added up: two spouses often report the same shares, and a joint filing carries a fund's.
| Insider | Role | Shares | % of company | Value | Last trade on file | Filed |
|---|---|---|---|---|---|---|
| Michael Hsing | CEO · Director | 964,129 | 2.0% | $1.3B | sold 30,000 shares at $1,323.31 on Sep 28, 2026 | Sep 28, 2026 |
| Maurice Sciammas | EVP, WW Sales & Marketing | 234,442 | 0.48% | $325.0M | sold 50,000 shares on Aug 4, 2026 | Aug 4, 2026 |
| Deming Xiao | EVP, Global Operations | 230,750 | 0.47% | $319.9M | sold 30,000 shares at $1,648.38 on May 6, 2026 | May 6, 2026 |
| Saria Tseng | EVP & General Counsel | 145,218 | 0.30% | $201.3M | sold 4,000 shares on Aug 31, 2026 | Aug 31, 2026 |
| Victor K. Lee | Director | 27,756 | 0.06% | $38.5M | sold 400 shares at $1,212.16 on Feb 9, 2026 | Feb 9, 2026 |
| Robert W. Dean II | Interim CFO | 7,154 | 0.01% | $9.9M | sold 32 shares at $1,297.72 on Aug 24, 2026 | Aug 24, 2026 |
| Eugen J. Elmiger | Director | 5,402 | 0.01% | $7.5M | sold 12,000 shares at $1,559.88 on May 6, 2026 | May 6, 2026 |
| Jeff Zhou | Director | 3,800 | <0.01% | $5.3M | sold 486 shares at $1,680.00 on May 26, 2026 | May 26, 2026 |
| Carintia Martinez | Director | 1,067 | <0.01% | $1.5M | bought 189 shares on Feb 3, 2026 | Feb 3, 2026 |
| Eileen Wynne | Director | 1,007 | <0.01% | $1.4M | sold 335 shares at $1,582.68 on May 6, 2026 | May 6, 2026 |
| Kuo Wei Herbert Chang | Director | 515 | <0.01% | $713,877.55 | sold 50 shares at $1,281.57 on Aug 24, 2026 | Aug 24, 2026 |
Each insider at Monolithic Power
- Michael Hsing — CEO · Director
- Maurice Sciammas — EVP, WW Sales & Marketing
- Deming Xiao — EVP, Global Operations
- Saria Tseng — EVP & General Counsel
- Victor K. Lee — Director
- Robert W. Dean II — Interim CFO
- Eugen J. Elmiger — Director
- Jeff Zhou — Director
- Carintia Martinez — Director
- Eileen Wynne — Director
- Kuo Wei Herbert Chang — Director
No longer filing
- Theodore Blegen — EVP and CFO
- James C. Moyer — Director
What insiders bought and sold across AI stocks · All filings on sec.gov