MPWR Congressional Stock Trades & Insider Buying (2026)

MPWR insider buying and selling over the past year

Insiders at MONOLITHIC POWER SYSTEMS, INC. only sold stock in the open market over the past year: 28 Form 4 sales totaling $447.95M, against no open-market purchases.

Only 12 of the 28 sales were flagged as Rule 10b5-1 plan trades, so most selling was discretionary rather than pre-scheduled. Activity clustered in 2025-11 (11 trades) and 2026-02 (11 trades); the latest filing in this window is dated 2026-03-20. The average open-market sale price was $1,073.76; the last close of $1,210.86 is 12.8% above that level, so sellers left upside on the table. The single largest trade was a sale of 54,923 shares worth $64.32M on 2026-02-06. Since the most recent filing the stock has moved +13.3%, from $1,068.85.

Where MPWR trades relative to its one-year range

MONOLITHIC POWER SYSTEMS, INC. closed at $1,210.86 on 2026-10-16, inside a one-year range of $856.96 to $1,689.89. That puts the stock in the middle of its range, at 42.5% of the distance from low to high. Over one year the share price moved +17.9%, and over roughly three months -7.7%. Average daily volume over the last month was about 767,322 shares.

Across 100 companies in the same SEC industry group (SIC 36) with a full year of prices in Gemral Edge, the median one-year return was +16.1%. MPWR is ahead of that median and beat 52% of that peer group on this measure.

Members of Congress who traded MPWR

STOCK Act disclosures show 21 trades in MPWR by 6 members of Congress over five years (13 purchases, 8 sales), most recently on 2026-07-27. The most active traders were Ro Khanna (D-CA), 10 trades; Markwayne Mullin (R-OK), 3 trades; Tommy Tuberville (R-AL), 3 trades; Byron Donalds (R-FL), 2 trades; Robert P. Bresnahan, Jr. (R-PA), 2 trades.

By party the trades split 11 by Republicans, 10 by Democrats; by chamber, 15 from the House, 6 from the Senate.

Compare MPWR with indexed peers from the same industry group

These peers have full Gemral Edge dossiers and the closest one-year price move to MPWR:

• NVDA one-year return +17.8%
• VRT one-year return +16.1%
• EMR one-year return +25.3%
• HUBB one-year return +7.5%
• MSI one-year return +5.9%

Sources and method

Every figure above is computed from public filings stored in Gemral Edge, not estimated. Insider figures count only open-market purchases and sales reported on SEC Form 4; option exercises, grants and gifts are excluded because they do not reflect a decision to buy or sell at market prices.

• SEC EDGAR Form 4 (edge_insider_trades, codes P/S open-market only) — as of 2026-03-20
• edge_prices_eod (end-of-day close) — as of 2026-10-16
• House PTR / Senate eFD disclosures (edge_congress_trades) — as of 2026-07-27

MPWR data questions

Are MPWR insiders buying or selling stock?

Insiders at MONOLITHIC POWER SYSTEMS, INC. only sold stock in the open market over the past year: 28 Form 4 sales totaling $447.95M, against no open-market purchases.

What is the one-year price range for MPWR?

Based on end-of-day closes through 2026-10-16, MPWR traded between $856.96 and $1,689.89, last closing at $1,210.86.

Has any member of Congress traded MPWR stock?

Yes. 6 members disclosed 21 trades in MPWR over five years; the most recent disclosed trade date is 2026-07-27.