MONOLITHIC POWER SYSTEMS INC (MPWR) Stock
MPWR has an Alpha Score of 32 out of 100 (poor), computed on Oct 22, 2026 from 3 of 4 sub-scores. 4 members of Congress disclosed 5 trades in MPWR since 2019: 2 purchases and 3 sales, most recently Byron Donalds (partial sale, Jun 5, 2026). 8 of the hedge funds AlphaScala tracks reported MPWR in 13F filings for the quarter ended Jun 30, 2026; the largest reported position is Millennium Management's at $189.16M. Company insiders reported 0 open-market buys and 14 sales on SEC Form 4 in the 90 days to Oct 21, 2026. Its trailing P/E ratio is 78.0 and its net margin 24.6% (key statistics as of Oct 22, 2026).
What is MPWR's Alpha Score?
How it works →Alpha Score of 32 reflects weak overall profile with weak momentum, poor value, strong quality. Based on 3 of 4 signals – score is capped at 90 until remaining data ingests.
Computed from 3 of 4 sub-scores; a sub-score is left out when its inputs are missing, and the composite is capped accordingly.
Computed Oct 22, 2026
A rules-based research rating, not a recommendation to buy or sell.
Which members of Congress traded MONOLITHIC POWER SYSTEMS INC (MPWR)?
Most recent: Byron Donalds (partial sale, Jun 5, 2026); records start Jun 24, 2019.
| Politician | Trade date | Type | Amount |
|---|---|---|---|
| Byron Donalds R-FL · House | 2026-06-05 | partial sale | $1k – $15k |
| Michael Guest R-MS · House | 2025-10-20 | purchase | $1k – $15k |
| Rob Bresnahan R-PA · House | 2025-04-08 | purchase | $1k – $15k |
| Rob Bresnahan R-PA · House | 2025-01-13 | sale | $1k – $15k |
| Donna Shalala D-FL · House | 2019-06-24 | sale | $1k – $15k |
From STOCK Act periodic transaction reports. House filings as of Oct 20, 2026.
See all MPWR political trades →Which hedge funds own MPWR?
From 13F filings| Fund | Shares Held | Position Value | Change vs prior Q |
|---|---|---|---|
| Millennium Management Israel Englander | 137K | $189.16M | NEW |
| Citadel Ken Griffin | 63K | $87.76M | +370% |
| Renaissance Technologies Jim Simons (founder) | 63K | $87.18M | NEW |
| Bridgewater Associates Ray Dalio | 3K | $4.28M | -74% |
| D.E. Shaw David Shaw | 3K | $4.20M | +149% |
| Marshall Wace | 2K | $2.56M | -73% |
| Maverick Capital Lee Ainslie | 593 | $819.7K | NEW |
| Blackstone | 516 | $713.3K | NEW |
13F holdings as of Jun 30, 2026
Explore all tracked funds →Are MONOLITHIC POWER SYSTEMS INC insiders buying or selling?
SEC Form 4 filings| Date | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| Sep 28, 26 | Hsing Michael | CEO | SELL | 596 | $789K |
| Sep 28, 26 | Hsing Michael | CEO | SELL | 2.1K | $2.8M |
| Sep 28, 26 | Hsing Michael | CEO | SELL | 1.1K | $1.5M |
| Sep 28, 26 | Hsing Michael | CEO | SELL | 2.9K | $3.9M |
| Sep 28, 26 | Hsing Michael | CEO | SELL | 5.8K | $7.8M |
| Sep 28, 26 | Hsing Michael | CEO | SELL | 6.3K | $8.5M |
| Sep 28, 26 | Hsing Michael | CEO | SELL | 11.0K | $14.8M |
| Sep 28, 26 | Hsing Michael | CEO | SELL | 130 | $176K |
| Aug 24, 26 | Chang Kuo Wei Herbert | Director | SELL | 50 | $64K |
| Aug 24, 26 | Dean Robert W Ii | Interim CFO | SELL | 32 | $42K |
SEC Form 4 filings as of Oct 21, 2026
See cluster-buy signals across all tickers →What are MPWR's key statistics?
Key statistics as of Oct 22, 2026
How does MPWR's valuation compare with the Technology sector?
| Metric | MPWR | Technology median | Companies in median |
|---|---|---|---|
| P/E ratio | 78.0 | 34.3 | 139 |
| Net margin | 24.58% | 13.92% | 153 |
| Return on equity | 21.93% | 16.22% | 155 |
| Dividend yield (payers) | 0.73% | 1.45% | 63 |
Medians over the Technology stocks whose key statistics were refreshed in the last 35 days (newest Oct 22, 2026). P/E excludes loss-making companies.
MPWR price chart
Powered by TradingViewWhat does MONOLITHIC POWER SYSTEMS INC do?
Monolithic Power Systems, Inc. is a leading fabless semiconductor company specializing in analog and mixed-signal power management solutions. It designs, develops, markets, and sells semiconductor-based power electronics, primarily direct current (DC) to DC integrated circuits (ICs) that convert and control voltages in electronic systems. These solutions minimize total energy consumption across diverse end markets, including storage and computing, automotive, enterprise data centers, cloud-based and on-premises CPU servers, server artificial intelligence applications, consumer devices, communications infrastructure, industrial equipment, notebooks, infotainment systems, home appliances, network infrastructure, and satellite communications. The company also offers alternating current to DC converters, driver metal-oxide-semiconductor field-effect transistors, power management ICs, current limit switches, and lighting control products for LCD backlighting in computers, televisions, and automotive displays. With a global presence in the United States, China, Taiwan, South Korea, Europe, Southeast Asia, and Japan, Monolithic Power Systems, Inc. sells through distributors, value-added resellers, and direct sales to original equipment manufacturers, partnering with third-party foundries using its proprietary BCD process technology. Founded in 1997 and headquartered in Kirkland, Washington, it plays a critical role in enabling higher performance, smaller form factors, and improved energy efficiency in modern electronics.