MPWR's three largest insider shareholders as of September 12, 2026 are Michael Hsing (Ceo, 996.75K shares), Michael Hsing (Ceo, 848.26K shares), Deming Xiao (Pres. Of Mps Asia Operations, 295.05K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Michael Hsing | Ceo | 1,845,009 | 0 | 1,845,009 | 48.4% | 20 May, 2026 |
| 2 | Maurice Sciammas | Evp, Ww Sales Marketing | 601,082 | 37,181 | 638,263 | 16.7% | 06 Aug, 2026 |
| 3 | Deming Xiao | Evp, Global Operations | 501,006 | 0 | 501,006 | 13.1% | 08 May, 2026 |
| 4 | Saria Tseng | Evp General Counsel | 403,601 | 2,000 | 405,601 | 10.6% | 02 Sep, 2026 |
| 5 | Theodore Blegen | Evp And Cfo | 361,884 | 0 | 361,884 | 9.5% | 10 Feb, 2026 |
| 6 | Victor K Lee | Director | 27,756 | 0 | 27,756 | 0.7% | 11 Feb, 2026 |
| 7 | Jeff Zhou | Director | 9,451 | 0 | 9,451 | 0.2% | 27 May, 2026 |
| 8 | James C Moyer | Director | 0 | 8,000 | 8,000 | 0.2% | 14 Feb, 2024 |
| 9 | Robert W Ii Dean | Interim Cfo | 7,089 | 0 | 7,089 | 0.2% | 26 Aug, 2026 |
| 10 | Eugen J Elmiger | Director | 5,402 | 0 | 5,402 | 0.1% | 08 May, 2026 |
| 11 | Carintia Martinez | Director | 1,067 | 0 | 1,067 | 0.0% | 03 Feb, 2026 |
| 12 | Eileen Wynne | Director | 1,007 | 0 | 1,007 | 0.0% | 08 May, 2026 |
| 13 | Kuo Wei Herbert Chang | Director | 515 | 0 | 515 | 0.0% | 25 Aug, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 24 Aug, 2026 | Robert W Ii Dean | Interim Cfo | Disposed S | 32 | $1,297.72 | $41.53K | 7,094 | Direct |
| 24 Aug, 2026 | Robert W Ii Dean | Interim Cfo | Disposed J | 5 | $0.00 | $0 | 7,089 | Direct |
| 24 Aug, 2026 | Kuo Wei Herbert Chang | Director | Disposed S | 50 | $1,281.57 | $64.08K | 515 | Direct |
| 17 Aug, 2026 | Robert W Ii Dean | Interim Cfo | Disposed S | 6 | $1,413.64 | $8.48K | 7,126 | Direct |
| 11 Aug, 2026 | Kuo Wei Herbert Chang | Director | Disposed S | 50 | $1,420.00 | $71.00K | 565 | Direct |
| 05 Aug, 2026 | Robert W Ii Dean | Interim Cfo | Disposed S | 105 | $1,344.27 | $141.15K | 7,132 | Direct |
| 04 Aug, 2026 | Maurice Sciammas | Evp, Ww Sales Marketing | Disposed G | 25,000 | $0.00 | $0 | 126,644 | Direct |
| 04 Aug, 2026 | Maurice Sciammas | Evp, Ww Sales Marketing | Acquired G | 25,000 | $0.00 | $0 | 36,062 | Indirect |
| 03 Aug, 2026 | Maurice Sciammas | Evp, Ww Sales Marketing | Disposed S | 30 | $1,343.94 | $40.32K | 1,119 | Indirect |
| 25 Jul, 2026 | Robert W Ii Dean | Interim Cfo | Acquired A | 1,359 | $0.00 | $0 | 7,237 | Direct |
| 15 Jul, 2026 | Maurice Sciammas | Evp, Ww Sales Marketing | Disposed S | 527 | $1,314.03 | $692.49K | 166,117 | Direct |
| 15 Jul, 2026 | Maurice Sciammas | Evp, Ww Sales Marketing | Disposed S | 274 | $1,318.42 | $361.25K | 165,843 | Direct |
| 15 Jul, 2026 | Maurice Sciammas | Evp, Ww Sales Marketing | Disposed S | 409 | $1,323.93 | $541.49K | 165,434 | Direct |
| 15 Jul, 2026 | Maurice Sciammas | Evp, Ww Sales Marketing | Disposed S | 464 | $1,329.30 | $616.80K | 164,970 | Direct |
| 15 Jul, 2026 | Maurice Sciammas | Evp, Ww Sales Marketing | Disposed S | 776 | $1,334.59 | $1.04Mn | 164,194 | Direct |
| 15 Jul, 2026 | Maurice Sciammas | Evp, Ww Sales Marketing | Disposed S | 1,460 | $1,339.59 | $1.96Mn | 162,734 | Direct |
| 15 Jul, 2026 | Maurice Sciammas | Evp, Ww Sales Marketing | Disposed S | 1,864 | $1,344.16 | $2.51Mn | 160,870 | Direct |
| 15 Jul, 2026 | Maurice Sciammas | Evp, Ww Sales Marketing | Disposed S | 1,506 | $1,348.91 | $2.03Mn | 159,364 | Direct |
| 15 Jul, 2026 | Maurice Sciammas | Evp, Ww Sales Marketing | Disposed S | 5,640 | $1,352.95 | $7.63Mn | 153,724 | Direct |
| 15 Jul, 2026 | Maurice Sciammas | Evp, Ww Sales Marketing | Disposed S | 50 | $1,359.36 | $67.97K | 153,674 | Direct |