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Monolithic Power Systems

Monolithic Power Systems (NASDAQ: MPWR) insider transactions

In the twelve months to 10 November 2026, executives and directors of Monolithic Power Systems reported 290 open-market sales of 611,051 shares ($724.5m) and 0 open-market purchases, by 11 people, according to the Form 4 filings they submitted to the SEC.

Latest transactions

The 20 most recent transactions in Monolithic Power Systems shares reported on Form 4
DateInsiderRoleTransactionSharesPriceHeld afterFiling
3 November 2026Sciammas MauriceEVP, WW Sales & MarketingGift−13,000—113,652Form 4
3 November 2026Sciammas MauriceEVP, WW Sales & MarketingGift+13,000—49,062Form 4
28 September 2026Hsing MichaelCEOOpen-market sale, 10b5-1 plan−596$1,323.31847,668Form 4
28 September 2026Hsing MichaelCEOOpen-market sale, 10b5-1 plan−2,121$1,328.54845,547Form 4
28 September 2026Hsing MichaelCEOOpen-market sale, 10b5-1 plan−1,111$1,333.34844,436Form 4
28 September 2026Hsing MichaelCEOOpen-market sale, 10b5-1 plan−2,949$1,338.66841,487Form 4
28 September 2026Hsing MichaelCEOOpen-market sale, 10b5-1 plan−5,783$1,343.76835,704Form 4
28 September 2026Hsing MichaelCEOOpen-market sale, 10b5-1 plan−6,343$1,347.15829,361Form 4
28 September 2026Hsing MichaelCEOOpen-market sale, 10b5-1 plan−10,967$1,351.43818,394Form 4
28 September 2026Hsing MichaelCEOOpen-market sale, 10b5-1 plan−130$1,356.94818,264Form 4
31 August 2026Tseng SariaEVP & General CounselGift−2,000—142,218Form 4
31 August 2026Tseng SariaEVP & General CounselGift+2,000—2,000Form 4
24 August 2026Dean Robert W IiInterim CFOOpen-market sale−32$1,297.727,094Form 4
24 August 2026Dean Robert W IiInterim CFOOther−5—7,089Form 4
24 August 2026Chang Kuo Wei HerbertDirectorOpen-market sale−50$1,281.57515Form 4
17 August 2026Dean Robert W IiInterim CFOOpen-market sale−6$1,413.647,126Form 4
11 August 2026Chang Kuo Wei HerbertDirectorOpen-market sale−50$1,420.00565Form 4
5 August 2026Dean Robert W IiInterim CFOOpen-market sale−105$1,344.277,132Form 4
4 August 2026Sciammas MauriceEVP, WW Sales & MarketingGift−25,000—126,644Form 4
4 August 2026Sciammas MauriceEVP, WW Sales & MarketingGift+25,000—36,062Form 4

Names appear as in the filing, surname first. A dash in the price column means the filing reports none, as in grants and gifts.

How to read the table

Only open-market purchases and sales are trades the insider chose to make at the market price, and they are the ones counted in the summary above. Grants, option exercises and shares withheld for tax come from pay plans. A sale marked as a 10b5-1 plan was scheduled in advance under a written plan.

Where each row comes from

From the Form 4 that each executive, director or large shareholder must file with the SEC within two business days of a transaction, read up to 10 November 2026. Each row links to its filing on EDGAR. Only transactions in shares are listed, not derivatives, and amended filings are left out. The accounts of the company are on the Monolithic Power Systems page; the method, in data sources.

Information prepared from the Form 4 filings submitted to the SEC, for information purposes only. It is not financial advice or a recommendation to buy or sell. Updated on 12 November 2026.