Alcoa’s Surging Volume and 4.01% Rally Rank 485th in U.S. Equities

On Sept. 26, 2025, Alcoa Inc. (AA) saw a trading volume of $0.21 billion, ranking 485th among U.S. equities. The stock closed 4.01% higher, marking a notable move in the industrial metals sector.

Analysts highlighted the stock’s performance amid broader market volatility, though no sector-specific catalysts were disclosed in available reports. The volume spike suggests heightened institutional or algorithmic activity, though no material earnings updates or macroeconomic data directly tied to the company were cited in screened materials.

A back-test framework for evaluating the stock’s historical volatility requires clarification on implementation parameters. Key unresolved questions include the market universe (e.g., S&P 1500 vs. broader U.S. stocks), pricing conventions for a one-day holding period, weighting methods for portfolio construction, and assumptions around transaction costs and rebalancing frequency. Finalizing these details will determine the accuracy of any performance simulation.

For the back-test to run rigorously, confirmation is needed on whether the “top-500” screen includes all U.S. listed stocks or a narrower index. Additionally, the pricing convention—close-to-close, open-to-close, or another method—must be defined. Weighting schemes (equal-weight vs. value-weight) and cost assumptions (e.g., 5 bps per trade) also require resolution before data retrieval and execution can proceed.