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Monolithic Power Systems, Inc. insider trading

Every open-market purchase and sale by Monolithic Power Systems, Inc.'s officers, directors and largest shareholders since November 4, 2021, and what the share price did next.

Insider purchases, 5 years $0 0 trades by 0 insiders Insider sales, 5 years $1.5B 340 trades by 13 insiders 3 months later: median +3.1% (+3.3% vs S&P 500)

No insider has bought shares on the open market in five years.

Insider purchase Insider sale Marker size reflects trade value. Weekly closes adjusted for splits; may be delayed.
DateInsiderTrade SharesPriceValue 1M after 3M after 6M after

From insiders' Form 4 filings with the SEC: open-market purchases and sales only (awards, option exercises and shares withheld for tax are excluded), combined to one line per insider per day. "Plan" marks trades the filing says were made under a pre-set Rule 10b5-1 trading plan, which are scheduled in advance. Price changes run from the close on the trade date; hover a figure for the change relative to the S&P 500. Past moves don't predict future ones.

Does following Monolithic Power Systems, Inc.’s insiders pay?

From February 2, 2010 to August 26, 2026, 17 insiders reported 0 open-market purchases and 816 sales not made under a pre-set plan in Monolithic Power Systems, Inc. After sales, the shares moved +22.3% against the index over 12 months (a negative figure means selling was the right call).

InsiderRolePurchases12 months after their purchasesBeat the S&P 500Sales12 months after their salesLatest report
Xiao Deming EVP, Global Operations 0 — — 166 +20.6% (164) May 8, 2026
Hsing Michael CEO 0 — — 129 +20.9% (125) May 20, 2026
Sciammas Maurice EVP, WW Sales & Marketing 0 — — 128 +22.1% (121) May 6, 2026
Tseng Saria EVP & General Counsel 0 — — 125 +24.8% (120) May 29, 2026
Blegen Theodore EVP and CFO 0 — — 82 +23.2% (81) February 10, 2026
Chang Kuo Wei Herbert Director 0 — — 63 +24.4% (59) August 25, 2026
Rao Meera CFO 0 — — 31 +26.5% (31) February 4, 2016
Zhou Jeff Director 0 — — 24 +24.3% (22) May 27, 2026
Ueunten Paul Sr. V.P. Design Engineering 0 — — 23 +12.0% (23) February 6, 2013
Moyer James C Director 0 — — 18 +23.9% (18) November 20, 2023
Lee Victor K Director 0 — — 14 +25.9% (14) November 23, 2016
Mcburnie Douglas M Director 0 — — 4 +28.5% (4) May 23, 2014
Dean Robert W II Interim CFO 0 — — 3 — August 26, 2026
Elmiger Eugen J Director 0 — — 2 +26.2% (1) May 8, 2026
Smith-Bogart Karen A Director 0 — — 2 +23.9% (2) February 23, 2015
Neely Rick Sr. VP and CFO 0 — — 1 −40.5% (1) August 13, 2010
Wynne Eileen Director 0 — — 1 — May 8, 2026

Moves are the shares’ return including dividends minus the S&P 500’s, from the close on the first trading day after each report; the number of trades with a finished 12-month window is in brackets. Green means the trade went the insider’s way (a purchase ahead of the index, a sale followed by the shares trailing it). A trade reported both by a director or officer and by a fund or company they are linked to counts once here, under the person. Purchases count only where the share price actually traded was at least $5. These figures describe what the shares did, not why anyone traded. Insiders across all companies.

When several insiders traded Monolithic Power Systems, Inc.

Months when 2 or more insiders became net buyers, or 3 or more net sellers, of Monolithic Power Systems, Inc. in reports dated in the 91 days before the month end, and how the stock did against the S&P 500 from that month end. After 2 selling crowds, −6.7%. One company's history is too short to judge by; the test across every company is the better guide.

MonthCrowd3 months on, vs S&P 5006 months12 months
September 30, 20253 selling−3.1%+23.1%+32.9%
April 30, 20104 selling−21.8%−36.5%−48.2%

Colours show whether the crowd was right: green when buyers were followed by a rise above the index, or sellers by a fall below it. Total returns from the month end; past patterns are not a forecast.

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