MONOLITHIC POWER SYSTEMS INC (MPWR) Insider Trading -- Recent Executive & Director Transactions
12 insiders reported 423 Form 4 transactions for MONOLITHIC POWER SYSTEMS INC (MPWR) over the past 18 months (most recent 2026-09-30). Recent activity: Hsing Michael (CEO) Sell 596 shares, Hsing Michael (CEO) Sell 2,121 shares, Hsing Michael (CEO) Sell 1,111 shares, Hsing Michael (CEO) Sell 2,949 shares, Hsing Michael (CEO) Sell 5,783 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-30 | Hsing Michael | CEO | Sell | 596 | $788,693 |
| 2026-09-30 | Hsing Michael | CEO | Sell | 2,121 | $2.8M |
| 2026-09-30 | Hsing Michael | CEO | Sell | 1,111 | $1.5M |
| 2026-09-30 | Hsing Michael | CEO | Sell | 2,949 | $3.9M |
| 2026-09-30 | Hsing Michael | CEO | Sell | 5,783 | $7.8M |
| 2026-09-30 | Hsing Michael | CEO | Sell | 6,343 | $8.5M |
| 2026-09-30 | Hsing Michael | CEO | Sell | 10,967 | $14.8M |
| 2026-09-30 | Hsing Michael | CEO | Sell | 130 | $176,402 |
| 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 | 527 | $692,494 |
| 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 |
Source: SEC Form 4 filings · as of 2026-09-30