Monolithic Power Systems, Inc. (MPWR)
Monolithic Power Systems, Inc. (MPWR) Insider Trading
Directors, officers and holders of more than 10% of MPWR report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.
Recent Form 4 transactions
The 50 most recent of 508 transactions on file: 0 with code P, 42 with code S and 8 with other codes.
| Date | Insider | Title | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 31, 2026 | Tseng Saria | EVP & General Counsel | G Gift | 2,000 | Not measured | Not measured |
| Aug 31, 2026 | Tseng Saria | EVP & General Counsel | G Gift | 2,000 | Not measured | Not measured |
| Aug 24, 2026 | DEAN ROBERT W II | Interim CFO | S Sale | 32 | $1297.72 | $41,527 |
| Aug 24, 2026 | DEAN ROBERT W II | Interim CFO | J Other | 5 | Not measured | Not measured |
| Aug 24, 2026 | CHANG KUO WEI HERBERT | Director | S Sale | 50 | $1281.57 | $64,079 |
| Aug 17, 2026 | DEAN ROBERT W II | Interim CFO | S Sale | 6 | $1413.64 | $8,482 |
| Aug 11, 2026 | CHANG KUO WEI HERBERT | Director | S Sale | 50 | $1420.00 | $71,000 |
| Aug 5, 2026 | DEAN ROBERT W II | Interim CFO | S Sale | 105 | $1344.27 | $141,148 |
| Aug 4, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | G Gift | 25,000 | Not measured | Not measured |
| Aug 4, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | G Gift | 25,000 | Not measured | Not measured |
| Aug 3, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 30 | $1343.94 | $40,318 |
| Jul 25, 2026 | DEAN ROBERT W II | Interim CFO | A Award | 1,359 | Not measured | Not measured |
| Jul 15, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 117 | $1400.45 | $163,853 |
| Jul 15, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 110 | $1405.71 | $154,628 |
| Jul 15, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 418 | $1378.73 | $576,309 |
| Jul 15, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 410 | $1384.11 | $567,485 |
| Jul 15, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 274 | $1318.42 | $361,247 |
| Jul 15, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 240 | $1369.18 | $328,603 |
| Jul 15, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 1,460 | $1339.59 | $1,955,801 |
| Jul 15, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 1,864 | $1344.16 | $2,505,514 |
| Jul 15, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 1,506 | $1348.91 | $2,031,458 |
| Jul 15, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 50 | $1359.36 | $67,968 |
| Jul 15, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 472 | $1375.47 | $649,222 |
| Jul 15, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 5,640 | $1352.95 | $7,630,638 |
| Jul 15, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 50 | $1388.19 | $69,410 |
| Jul 15, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 409 | $1323.93 | $541,487 |
| Jul 15, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 213 | $1396.16 | $297,382 |
| Jul 15, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 527 | $1314.03 | $692,494 |
| Jul 15, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 464 | $1329.30 | $616,795 |
| Jul 15, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 776 | $1334.59 | $1,035,642 |
| Jul 1, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 30 | $1351.61 | $40,548 |
| Jun 1, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | S Sale | 30 | $1533.95 | $46,019 |
| May 29, 2026 | Sciammas Maurice | EVP, WW Sales & Marketing | G Gift | 12,472 | Not measured | Not measured |
| May 27, 2026 | Tseng Saria | EVP & General Counsel | S Sale | 7,565 | $1700.00 | $12,860,500 |
| May 26, 2026 | DEAN ROBERT W II | Interim CFO | S Sale | 22 | $1649.56 | $36,290 |
| May 26, 2026 | Zhou Jeff | Director | S Sale | 486 | $1680.00 | $816,480 |
| May 22, 2026 | Tseng Saria | EVP & General Counsel | S Sale | 5,000 | $1586.43 | $7,932,150 |
| May 22, 2026 | Tseng Saria | EVP & General Counsel | G Gift | 200 | Not measured | Not measured |
| May 18, 2026 | Hsing Michael | CEO | S Sale | 130 | $1521.43 | $197,786 |
| May 18, 2026 | DEAN ROBERT W II | Interim CFO | S Sale | 4 | $1563.28 | $6,253 |
| May 18, 2026 | Hsing Michael | CEO | S Sale | 2,929 | $1503.05 | $4,402,433 |
| May 18, 2026 | Hsing Michael | CEO | S Sale | 6,688 | $1486.76 | $9,943,451 |
| May 18, 2026 | Hsing Michael | CEO | S Sale | 3,769 | $1507.70 | $5,682,521 |
| May 18, 2026 | Hsing Michael | CEO | S Sale | 551 | $1513.11 | $833,724 |
| May 18, 2026 | Hsing Michael | CEO | S Sale | 862 | $1491.48 | $1,285,656 |
| May 18, 2026 | Hsing Michael | CEO | S Sale | 352 | $1518.15 | $534,389 |
| May 18, 2026 | Hsing Michael | CEO | S Sale | 5,049 | $1472.84 | $7,436,369 |
| May 18, 2026 | Hsing Michael | CEO | S Sale | 4,082 | $1476.96 | $6,028,951 |
| May 18, 2026 | Hsing Michael | CEO | S Sale | 3,424 | $1462.61 | $5,007,977 |
| May 18, 2026 | Hsing Michael | CEO | S Sale | 5,819 | $1467.62 | $8,540,081 |
The full Form 4 history is on the MPWR company page (Insider Trades card, View all).
Questions about this data
Which insider transactions are open-market trades?
Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.
How quickly are insider trades reported?
A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.
Who has to file Form 4?
Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.
Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.