MPWR Shares Slide 0.75% as Trading Volume Plummets 44.26% to Rank 437th

On September 9, 2025, Monolithic Power (MPWR) closed at a 0.75% decline with $240 million in trading volume, representing a 44.26% drop from the previous day's activity. The stock ranked 437th in trading volume among listed companies on the day.

Recent developments indicate mixed market sentiment toward MPWR. Analysts noted that the company's recent earnings report, while meeting revenue estimates, showed a narrowing gross margin due to higher component costs. Institutional investors reduced exposure in the wake of a bearish technical pattern forming on the 50-day moving average. Short interest data revealed a 12% increase in short positions over the last two weeks, suggesting growing bearish positioning ahead of the next earnings cycle.

Backtesting parameters for volume-based strategies highlight critical implementation challenges. A 1-day intraday approach requires precise execution timing, while overnight strategies face overnight liquidity risks. Position sizing remains a key variable, with equal-weight models showing divergent performance compared to volume-weighted allocations. Transaction cost assumptions significantly impact net returns, with 5 basis points per trade creating a material drag over extended periods.

To build an accurate back-test I need to nail down a few practical details: Universe definition, ranking frequency & trade execution, position sizing, and transaction costs & slippage. Once these points are established, the necessary volume data can be pulled to generate daily trade lists and run the back-test from 2022-01-03 through today.