MPWR · Monolithic Power Systems Inc. Common Stock
View on chartInsiders & Stakes
| Michael Hsing CEO | ▼ Sell | Open Market | 848,263 Shares held | 5/18/2026 | View profile |
| Deming Xiao Pres. of MPS Asia Operations | ▼ Sell | Open Market | 205,959 Shares held | 5/6/2026 | View profile |
| Saria Tseng VP & General Counsel | ▼ Sell | Open Market | 144,218 Shares held | 5/27/2026 | View profile |
| Theodore Blegen CFO | ▼ Sell | Open Market | 82,353 Shares held | 2/6/2026 | View profile |
| Maurice Sciammas Sr. V.P.of Sales and Marketing | ▼ Sell | Gift | 36,062 Shares held | 8/4/2026 | View profile |
| Victor K. Lee | ▼ Sell | Open Market | 27,756 Shares held | 2/9/2026 | View profile |
| Robert W. Dean II Interim CFO | ▼ Sell | Open Market | 7,126 Shares held | 8/17/2026 | View profile |
| Eugen J. Elmiger | ▼ Sell | Open Market | 5,402 Shares held | 5/6/2026 | View profile |
| Jeff Zhou | ▼ Sell | Open Market | 3,800 Shares held | 5/26/2026 | View profile |
| Martinez Carintia | ▲ Buy | Grant | 1,067 Shares held | 2/3/2026 | View profile |
| Eileen Wynne | ▼ Sell | Open Market | 1,007 Shares held | 5/6/2026 | View profile |
| Kuo Wei Herbert Chang | ▼ Sell | Open Market | 565 Shares held | 8/11/2026 | View profile |
| Moyer James C | ▼ Sell | Gift | 0 Shares held | 8/29/2024 | View profile |
Transaction History
| Robert W. Dean II | ▼ Sell | Open Market | 6 | $8K | 8/17/2026 |
| Kuo Wei Herbert Chang | ▼ Sell | Open Market | 50 | $71K | 8/11/2026 |
| Robert W. Dean II | ▼ Sell | Open Market | 105 | $141K | 8/5/2026 |
| Maurice Sciammas | ▼ Sell | Gift | 25,000 | $0 | 8/4/2026 |
| Maurice Sciammas | ▼ Sell | Gift | 25,000 | $0 | 8/4/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 30 | $40K | 8/3/2026 |
| Robert W. Dean II | ▲ Buy | Grant | 1,359 | $0 | 7/25/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 527 | $692K | 7/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 274 | $361K | 7/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 409 | $541K | 7/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 1,864 | $2.5M | 7/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 1,506 | $2.0M | 7/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 5,640 | $7.6M | 7/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 50 | $68K | 7/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 240 | $329K | 7/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 472 | $649K | 7/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 418 | $576K | 7/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 410 | $567K | 7/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 50 | $69K | 7/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 213 | $297K | 7/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 117 | $164K | 7/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 110 | $155K | 7/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 464 | $617K | 7/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 776 | $1.0M | 7/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 1,460 | $2.0M | 7/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 30 | $41K | 7/1/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 30 | $46K | 6/1/2026 |
| Maurice Sciammas | ▼ Sell | Gift | 12,472 | $0 | 5/29/2026 |
| Saria Tseng | ▼ Sell | Open Market | 7,565 | $12.9M | 5/27/2026 |
| Robert W. Dean II | ▼ Sell | Open Market | 22 | $36K | 5/26/2026 |
| Jeff Zhou | ▼ Sell | Open Market | 486 | $816K | 5/26/2026 |
| Saria Tseng | ▼ Sell | Gift | 200 | $0 | 5/22/2026 |
| Saria Tseng | ▼ Sell | Open Market | 5,000 | $7.9M | 5/22/2026 |
| Michael Hsing | ▼ Sell | Open Market | 3,424 | $5.0M | 5/18/2026 |
| Michael Hsing | ▼ Sell | Open Market | 5,819 | $8.5M | 5/18/2026 |
| Michael Hsing | ▼ Sell | Open Market | 5,049 | $7.4M | 5/18/2026 |
| Michael Hsing | ▼ Sell | Open Market | 4,082 | $6.0M | 5/18/2026 |
| Michael Hsing | ▼ Sell | Open Market | 5,737 | $8.5M | 5/18/2026 |
| Michael Hsing | ▼ Sell | Open Market | 6,688 | $9.9M | 5/18/2026 |
| Michael Hsing | ▼ Sell | Open Market | 862 | $1.3M | 5/18/2026 |
| Michael Hsing | ▼ Sell | Open Market | 608 | $912K | 5/18/2026 |
| Michael Hsing | ▼ Sell | Open Market | 2,929 | $4.4M | 5/18/2026 |
| Michael Hsing | ▼ Sell | Open Market | 3,769 | $5.7M | 5/18/2026 |
| Michael Hsing | ▼ Sell | Open Market | 551 | $834K | 5/18/2026 |
| Michael Hsing | ▼ Sell | Open Market | 352 | $534K | 5/18/2026 |
| Michael Hsing | ▼ Sell | Open Market | 130 | $198K | 5/18/2026 |
| Robert W. Dean II | ▼ Sell | Open Market | 4 | $6K | 5/18/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 3,741 | $5.8M | 5/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 1,717 | $2.7M | 5/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 2,010 | $3.1M | 5/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 2,020 | $3.2M | 5/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 1,312 | $2.1M | 5/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 703 | $1.1M | 5/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 447 | $707K | 5/15/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 50 | $79K | 5/15/2026 |
| Maurice Sciammas | ▼ Sell | Gift | 1,563 | $0 | 5/13/2026 |
| Maurice Sciammas | ▼ Sell | Gift | 1,563 | $0 | 5/13/2026 |
| Robert W. Dean II | ▼ Sell | Other | 2,156 | $0 | 5/13/2026 |
| Eugen J. Elmiger | ▼ Sell | Open Market | 320 | $499K | 5/6/2026 |
| Eugen J. Elmiger | ▼ Sell | Open Market | 814 | $1.3M | 5/6/2026 |
| Eugen J. Elmiger | ▼ Sell | Open Market | 1,078 | $1.7M | 5/6/2026 |
| Eugen J. Elmiger | ▼ Sell | Open Market | 834 | $1.3M | 5/6/2026 |
| Eugen J. Elmiger | ▼ Sell | Open Market | 1,879 | $3.0M | 5/6/2026 |
| Eugen J. Elmiger | ▼ Sell | Open Market | 2,587 | $4.1M | 5/6/2026 |
| Eugen J. Elmiger | ▼ Sell | Open Market | 1,355 | $2.2M | 5/6/2026 |
| Eugen J. Elmiger | ▼ Sell | Open Market | 2,619 | $4.2M | 5/6/2026 |
| Eugen J. Elmiger | ▼ Sell | Open Market | 514 | $822K | 5/6/2026 |
| Deming Xiao | ▼ Sell | Open Market | 3,329 | $5.5M | 5/6/2026 |
| Deming Xiao | ▼ Sell | Open Market | 14,167 | $23.4M | 5/6/2026 |
| Deming Xiao | ▼ Sell | Open Market | 11,597 | $19.2M | 5/6/2026 |
| Deming Xiao | ▼ Sell | Open Market | 907 | $1.5M | 5/6/2026 |
| Eileen Wynne | ▼ Sell | Open Market | 335 | $530K | 5/6/2026 |
| Jeff Zhou | ▼ Sell | Open Market | 500 | $825K | 5/6/2026 |
| Jeff Zhou | ▼ Sell | Open Market | 514 | $809K | 5/5/2026 |
| Jeff Zhou | ▼ Sell | Open Market | 500 | $800K | 5/5/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 380 | $602K | 5/5/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 30 | $48K | 5/4/2026 |
| Saria Tseng | ▼ Sell | Open Market | 560 | $709K | 4/8/2026 |
| Saria Tseng | ▼ Sell | Open Market | 360 | $457K | 4/8/2026 |
| Saria Tseng | ▼ Sell | Open Market | 240 | $307K | 4/8/2026 |
| Saria Tseng | ▼ Sell | Open Market | 120 | $154K | 4/8/2026 |
| Saria Tseng | ▼ Sell | Open Market | 400 | $517K | 4/8/2026 |
| Saria Tseng | ▼ Sell | Open Market | 800 | $1.0M | 4/8/2026 |
| Saria Tseng | ▼ Sell | Open Market | 1,279 | $1.7M | 4/8/2026 |
| Saria Tseng | ▼ Sell | Open Market | 4,244 | $5.6M | 4/8/2026 |
| Saria Tseng | ▼ Sell | Open Market | 840 | $1.1M | 4/8/2026 |
| Saria Tseng | ▼ Sell | Open Market | 120 | $159K | 4/8/2026 |
| Saria Tseng | ▼ Sell | Open Market | 244 | $278K | 4/6/2026 |
| Saria Tseng | ▼ Sell | Open Market | 556 | $636K | 4/6/2026 |
| Saria Tseng | ▼ Sell | Open Market | 480 | $552K | 4/6/2026 |
| Saria Tseng | ▼ Sell | Open Market | 560 | $649K | 4/6/2026 |
| Saria Tseng | ▼ Sell | Open Market | 684 | $797K | 4/6/2026 |
| Saria Tseng | ▼ Sell | Open Market | 2,036 | $2.4M | 4/6/2026 |
| Saria Tseng | ▼ Sell | Open Market | 1,680 | $2.0M | 4/6/2026 |
| Saria Tseng | ▼ Sell | Open Market | 1,396 | $1.6M | 4/6/2026 |
| Saria Tseng | ▼ Sell | Open Market | 576 | $652K | 4/1/2026 |
| Saria Tseng | ▼ Sell | Open Market | 184 | $208K | 4/1/2026 |
| Saria Tseng | ▼ Sell | Open Market | 160 | $181K | 4/1/2026 |
| Saria Tseng | ▼ Sell | Open Market | 188 | $214K | 4/1/2026 |
| Saria Tseng | ▼ Sell | Open Market | 292 | $332K | 4/1/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 30 | $33K | 4/1/2026 |
| Saria Tseng | ▼ Sell | Open Market | 5,154 | $5.2M | 3/30/2026 |
| Saria Tseng | ▼ Sell | Open Market | 9,080 | $9.1M | 3/30/2026 |
| Saria Tseng | ▼ Sell | Open Market | 3,360 | $3.4M | 3/30/2026 |
| Saria Tseng | ▼ Sell | Open Market | 3,194 | $3.2M | 3/30/2026 |
| Saria Tseng | ▼ Sell | Open Market | 2,200 | $2.3M | 3/30/2026 |
| Saria Tseng | ▼ Sell | Open Market | 2,440 | $2.5M | 3/30/2026 |
| Saria Tseng | ▼ Sell | Open Market | 166 | $172K | 3/30/2026 |
| Saria Tseng | ▼ Sell | Open Market | 80 | $83K | 3/30/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 30 | $33K | 3/20/2026 |
| Michael Hsing | ▼ Sell | Open Market | 12,731 | $14.7M | 2/12/2026 |
| Michael Hsing | ▼ Sell | Open Market | 4,992 | $5.8M | 2/12/2026 |
| Michael Hsing | ▼ Sell | Open Market | 4,001 | $4.7M | 2/12/2026 |
| Michael Hsing | ▼ Sell | Open Market | 2,076 | $2.4M | 2/12/2026 |
| Michael Hsing | ▼ Sell | Open Market | 200 | $235K | 2/12/2026 |
| Michael Hsing | ▼ Sell | Open Market | 480 | $567K | 2/12/2026 |
| Michael Hsing | ▼ Sell | Open Market | 160 | $190K | 2/12/2026 |
| Michael Hsing | ▼ Sell | Open Market | 600 | $717K | 2/12/2026 |
| Michael Hsing | ▼ Sell | Open Market | 1,440 | $1.7M | 2/12/2026 |
| Michael Hsing | ▼ Sell | Open Market | 3,640 | $4.4M | 2/12/2026 |
| Michael Hsing | ▼ Sell | Open Market | 1,240 | $1.5M | 2/12/2026 |
| Michael Hsing | ▼ Sell | Open Market | 1,440 | $1.8M | 2/12/2026 |
| Michael Hsing | ▼ Sell | Open Market | 363 | $421K | 2/11/2026 |
| Michael Hsing | ▼ Sell | Open Market | 1,366 | $1.6M | 2/11/2026 |
| Michael Hsing | ▼ Sell | Open Market | 1,533 | $1.8M | 2/11/2026 |
| Michael Hsing | ▼ Sell | Open Market | 1,987 | $2.3M | 2/11/2026 |
| Michael Hsing | ▼ Sell | Open Market | 2,799 | $3.3M | 2/11/2026 |
| Michael Hsing | ▼ Sell | Open Market | 1,542 | $1.8M | 2/11/2026 |
| Michael Hsing | ▼ Sell | Open Market | 2,104 | $2.5M | 2/11/2026 |
| Michael Hsing | ▼ Sell | Open Market | 6,079 | $7.3M | 2/11/2026 |
| Michael Hsing | ▼ Sell | Open Market | 14,578 | $17.5M | 2/11/2026 |
| Michael Hsing | ▼ Sell | Open Market | 649 | $780K | 2/11/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 200 | $236K | 2/11/2026 |
| Michael Hsing | ▼ Sell | Open Market | 4,302 | $4.9M | 2/10/2026 |
| Michael Hsing | ▼ Sell | Open Market | 6,325 | $7.2M | 2/10/2026 |
| Michael Hsing | ▼ Sell | Open Market | 3,864 | $4.4M | 2/10/2026 |
| Michael Hsing | ▼ Sell | Open Market | 1,215 | $1.4M | 2/10/2026 |
| Michael Hsing | ▼ Sell | Open Market | 694 | $802K | 2/10/2026 |
| Michael Hsing | ▼ Sell | Open Market | 360 | $418K | 2/10/2026 |
| Michael Hsing | ▼ Sell | Open Market | 880 | $1.0M | 2/10/2026 |
| Michael Hsing | ▼ Sell | Open Market | 280 | $335K | 2/10/2026 |
| Michael Hsing | ▼ Sell | Open Market | 16,080 | $18.4M | 2/10/2026 |
| Victor K. Lee | ▼ Sell | Open Market | 400 | $485K | 2/9/2026 |
| Deming Xiao | ▼ Sell | Open Market | 22,875 | $26.8M | 2/6/2026 |
| Saria Tseng | ▼ Sell | Open Market | 22,875 | $26.8M | 2/6/2026 |
| Maurice Sciammas | ▼ Sell | Open Market | 22,875 | $26.8M | 2/6/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 21,725 | $25.4M | 2/6/2026 |
| Michael Hsing | ▼ Sell | Open Market | 54,923 | $64.3M | 2/6/2026 |
| Eileen Wynne | ▲ Buy | Grant | 189 | $0 | 2/3/2026 |
| Jeff Zhou | ▲ Buy | Grant | 189 | $0 | 2/3/2026 |
| Kuo Wei Herbert Chang | ▲ Buy | Grant | 189 | $0 | 2/3/2026 |
| Eugen J. Elmiger | ▲ Buy | Grant | 189 | $0 | 2/3/2026 |
| Victor K. Lee | ▲ Buy | Grant | 189 | $0 | 2/3/2026 |
| Martinez Carintia | ▲ Buy | Grant | 189 | $0 | 2/3/2026 |
| Deming Xiao | ▲ Buy | Grant | 57,170 | $0 | 2/3/2026 |
| Theodore Blegen | ▲ Buy | Grant | 38,745 | $0 | 2/3/2026 |
| Saria Tseng | ▲ Buy | Grant | 57,170 | $0 | 2/3/2026 |
| Michael Hsing | ▲ Buy | Grant | 136,825 | $0 | 2/3/2026 |
| Maurice Sciammas | ▲ Buy | Grant | 57,170 | $0 | 2/3/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 220 | $244K | 2/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 40 | $45K | 2/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 80 | $90K | 2/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 40 | $45K | 2/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 200 | $225K | 2/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 80 | $90K | 2/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 240 | $271K | 2/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 240 | $271K | 2/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 320 | $362K | 2/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 198 | $224K | 2/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 322 | $365K | 2/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 379 | $430K | 2/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 241 | $273K | 2/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 120 | $136K | 2/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 120 | $136K | 2/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 80 | $91K | 2/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 80 | $91K | 2/2/2026 |
| Victor K. Lee | ▼ Sell | Open Market | 600 | $559K | 1/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 80 | $74K | 1/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 194 | $181K | 1/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 80 | $75K | 1/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 40 | $37K | 1/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 80 | $75K | 1/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 120 | $112K | 1/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 460 | $432K | 1/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 117 | $110K | 1/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 40 | $38K | 1/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 406 | $382K | 1/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 74 | $70K | 1/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 539 | $509K | 1/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 650 | $614K | 1/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 40 | $38K | 1/2/2026 |
| Theodore Blegen | ▼ Sell | Open Market | 80 | $76K | 1/2/2026 |
| Saria Tseng | ▼ Sell | Gift | 1,000 | $0 | 12/24/2025 |
| Saria Tseng | ▼ Sell | Gift | 1,000 | $0 | 12/24/2025 |
| Victor K. Lee | ▼ Sell | Open Market | 197 | $187K | 12/24/2025 |
| Victor K. Lee | ▼ Sell | Open Market | 280 | $266K | 12/24/2025 |
| Victor K. Lee | ▼ Sell | Open Market | 160 | $152K | 12/24/2025 |
| Victor K. Lee | ▼ Sell | Open Market | 83 | $79K | 12/24/2025 |
| Victor K. Lee | ▼ Sell | Open Market | 200 | $191K | 12/24/2025 |
| Victor K. Lee | ▼ Sell | Open Market | 80 | $76K | 12/24/2025 |