Monolithic Power Systems's three largest insider shareholders as of August 04, 2026 are Michael Hsing (Ceo, 996.75K shares), Michael Hsing (Ceo, 888.23K 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 | 1,884,980 | 0 | 1,884,980 | 50.4% | 17 Feb, 2026 |
| 2 | Deming Xiao | Evp, Global Operations | 530,979 | 0 | 530,979 | 14.2% | 10 Feb, 2026 |
| 3 | Maurice Sciammas | Evp, Ww Sales Marketing | 474,438 | 1,239 | 475,677 | 12.7% | 03 Apr, 2026 |
| 4 | Saria Tseng | Evp General Counsel | 418,366 | 0 | 418,366 | 11.2% | 10 Apr, 2026 |
| 5 | Theodore Blegen | Evp And Cfo | 361,884 | 0 | 361,884 | 9.7% | 10 Feb, 2026 |
| 6 | Victor K Lee | Director | 27,756 | 0 | 27,756 | 0.7% | 11 Feb, 2026 |
| 7 | Eugen J Elmiger | Director | 17,402 | 0 | 17,402 | 0.5% | 03 Feb, 2026 |
| 8 | Jeff Zhou | Director | 11,451 | 0 | 11,451 | 0.3% | 03 Feb, 2026 |
| 9 | James C Moyer | Director | 0 | 8,000 | 8,000 | 0.2% | 14 Feb, 2024 |
| 10 | Eileen Wynne | Director | 1,342 | 0 | 1,342 | 0.0% | 03 Feb, 2026 |
| 11 | Carintia Martinez | Director | 1,067 | 0 | 1,067 | 0.0% | 03 Feb, 2026 |
| 12 | Kuo Wei Herbert Chang | Director | 615 | 0 | 615 | 0.0% | 03 Feb, 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 |
|---|---|---|---|---|---|---|---|---|
| 08 Apr, 2026 | Saria Tseng | Evp General Counsel | Disposed S | 560 | $1,266.48 | $709.23K | 165,386 | Direct |
| 08 Apr, 2026 | Saria Tseng | Evp General Counsel | Disposed S | 360 | $1,270.29 | $457.30K | 165,026 | Direct |
| 08 Apr, 2026 | Saria Tseng | Evp General Counsel | Disposed S | 240 | $1,279.55 | $307.09K | 164,786 | Direct |
| 08 Apr, 2026 | Saria Tseng | Evp General Counsel | Disposed S | 120 | $1,287.12 | $154.45K | 164,666 | Direct |
| 08 Apr, 2026 | Saria Tseng | Evp General Counsel | Disposed S | 400 | $1,292.08 | $516.83K | 164,266 | Direct |
| 08 Apr, 2026 | Saria Tseng | Evp General Counsel | Disposed S | 800 | $1,302.52 | $1.04Mn | 163,466 | Direct |
| 08 Apr, 2026 | Saria Tseng | Evp General Counsel | Disposed S | 1,279 | $1,308.30 | $1.67Mn | 162,187 | Direct |
| 08 Apr, 2026 | Saria Tseng | Evp General Counsel | Disposed S | 4,244 | $1,312.82 | $5.57Mn | 157,943 | Direct |
| 08 Apr, 2026 | Saria Tseng | Evp General Counsel | Disposed S | 840 | $1,319.25 | $1.11Mn | 157,103 | Direct |
| 08 Apr, 2026 | Saria Tseng | Evp General Counsel | Disposed S | 120 | $1,321.94 | $158.63K | 156,983 | Direct |
| 06 Apr, 2026 | Saria Tseng | Evp General Counsel | Disposed S | 244 | $1,139.96 | $278.15K | 173,338 | Direct |
| 06 Apr, 2026 | Saria Tseng | Evp General Counsel | Disposed S | 556 | $1,144.42 | $636.30K | 172,782 | Direct |
| 06 Apr, 2026 | Saria Tseng | Evp General Counsel | Disposed S | 480 | $1,149.05 | $551.54K | 172,302 | Direct |
| 06 Apr, 2026 | Saria Tseng | Evp General Counsel | Disposed S | 560 | $1,159.62 | $649.39K | 171,742 | Direct |
| 06 Apr, 2026 | Saria Tseng | Evp General Counsel | Disposed S | 684 | $1,165.66 | $797.31K | 171,058 | Direct |
| 06 Apr, 2026 | Saria Tseng | Evp General Counsel | Disposed S | 2,036 | $1,170.38 | $2.38Mn | 169,022 | Direct |
| 06 Apr, 2026 | Saria Tseng | Evp General Counsel | Disposed S | 1,680 | $1,176.35 | $1.98Mn | 167,342 | Direct |
| 06 Apr, 2026 | Saria Tseng | Evp General Counsel | Disposed S | 1,396 | $1,179.50 | $1.65Mn | 165,946 | Direct |
| 01 Apr, 2026 | Saria Tseng | Evp General Counsel | Disposed S | 576 | $1,131.24 | $651.59K | 174,406 | Direct |
| 01 Apr, 2026 | Maurice Sciammas | Evp, Ww Sales Marketing | Disposed S | 30 | $1,116.44 | $33.49K | 1,239 | Indirect |