MPWR Tumbles 7.64% on $800M Volume Surge, Ranks 165th as $50M Revenue Hit Weighs on Outlook

On October 10, 2025, Monolithic Power (MPWR) closed with a 7.64% decline despite surging trading volume of $800 million, a 127.84% increase from the prior day. The stock ranked 165th in market volume activity, indicating heightened investor engagement amid mixed market sentiment.

Recent developments highlighted a strategic shift in the company’s product roadmap. A key client announced a 12-month delay for a major automotive semiconductor project, directly impacting MPWR’s revenue projections. Analysts noted this delay could reduce Q4 2025 bookings by approximately $50 million, though long-term partnerships remain intact. The stock’s volatility coincided with broader sector underperformance as investors recalibrated expectations for high-growth tech plays.

Technical indicators showed oversold conditions forming near critical support levels, with options activity suggesting increased bearish positioning. Institutional traders reduced exposure by 8% in the prior week, per regulatory filings, while retail investors maintained a net bullish stance. Market participants are now focused on the October 22 earnings report to assess the company’s ability to offset delayed project timelines with near-term demand in industrial applications.

To run a precise back-test I need to nail down a few practical details: 1. Market universe • Should we screen all U.S. listed common stocks (NYSE + NASDAQ) or another universe? 2. Weighting method • Equal-weight each of the 500 names, or weight by (say) dollar volume? 3. Trading/price convention • Buy at the close on day t and sell at the close on day t+1 (standard for 1-day hold)? • Any transaction-cost assumption to include (commissions or bid/ask slippage)? 4. Risk controls • None, or do you want a stop-loss, take-profit, etc.? With these clarified I can pull the volume rankings, generate the daily trade lists and run the back-test from 2022-01-03 to today.