Carmax Shares Drop 0.95% Amid 47.27% Volume Surge Ranks 358th in U.S. Trading Activity

Carmax (KMX) closed on Sept. 24, 2025 with a 0.95% decline, trading at a volume of $0.28 billion—47.27% higher than the previous day's activity. The stock ranked 358th in trading volume among U.S. equities, indicating heightened short-term market engagement despite the downward price movement.

Recent market dynamics highlight shifting investor sentiment toward automotive retail platforms. Analysts noted increased scrutiny of sector fundamentals amid evolving consumer preferences and inventory management strategies. While no direct earnings or strategic announcements were reported for Carmax, broader macroeconomic indicators and sector-specific trends contributed to the stock's volatility.

To accurately simulate a volume-based trading strategy for Carmax, key parameters require clarification. The back-test would ideally use all U.S.-listed common stocks (NYSE, NASDAQ, AMEX) as the market universe. A daily ranking by trading volume would trigger buy/sell decisions, with execution assumed at day's close and liquidation at the next close. Equal dollar allocation across 500 names per day, with zero transaction costs, forms the baseline framework. The test window spans from Jan. 3, 2022, to the most recent available data.

If the outlined methodology is acceptable, proceed with "Go ahead" to initiate the data retrieval and back-test execution. Adjustments to the framework, such as restricting the universe to specific indices or modifying execution timing, should be communicated prior to implementation.