12 insiders reported 415 Form 4 transactions for MONOLITHIC POWER SYSTEMS INC (MPWR) over the past 18 months (most recent 2026-09-02). Recent activity: Tseng Saria (EVP & General Counsel) Sell 2,000 shares, Tseng Saria (EVP & General Counsel) Buy 2,000 shares, DEAN ROBERT W II (Interim CFO) Sell 32 shares, DEAN ROBERT W II (Interim CFO) Sell 5 shares, CHANG KUO WEI HERBERT (Director) Sell 50 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-02 | Tseng Saria | EVP & General Counsel | Sell | 2,000 | $0 |
| 2026-09-02 | Tseng Saria | EVP & General Counsel | Buy | 2,000 | $0 |
| 2026-08-26 | DEAN ROBERT W II | Interim CFO | Sell | 32 | $41,527 |
| 2026-08-26 | DEAN ROBERT W II | Interim CFO | Sell | 5 | $0 |
| 2026-08-25 | CHANG KUO WEI HERBERT | Director | Sell | 50 | $64,078 |
| 2026-08-19 | DEAN ROBERT W II | Interim CFO | Sell | 6 | $8,482 |
| 2026-08-13 | CHANG KUO WEI HERBERT | Director | Sell | 50 | $71,000 |
| 2026-08-06 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 25,000 | $0 |
| 2026-08-06 | DEAN ROBERT W II | Interim CFO | Sell | 105 | $141,148 |
| 2026-08-06 | Sciammas Maurice | EVP, WW Sales & Marketing | Buy | 25,000 | $0 |
| 2026-08-05 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 30 | $40,318 |
| 2026-07-28 | DEAN ROBERT W II | Interim CFO | Buy | 1,359 | $0 |
| 2026-07-17 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 418 | $576,309 |
| 2026-07-17 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 274 | $361,247 |
| 2026-07-17 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 409 | $541,487 |
| 2026-07-17 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 464 | $616,795 |
| 2026-07-17 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 776 | $1.0M |
| 2026-07-17 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 1,460 | $2.0M |
| 2026-07-17 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 1,864 | $2.5M |
| 2026-07-17 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 1,506 | $2.0M |
| 2026-07-17 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 5,640 | $7.6M |
| 2026-07-17 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 50 | $67,968 |
| 2026-07-17 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 240 | $328,603 |
| 2026-07-17 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 472 | $649,222 |
| 2026-07-17 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 527 | $692,494 |
来源：SEC Form 4 申报文件 · 截至 2026-09-02