Regions Financial Slides 1.26% as Volume Surges to 270th-Busiest in Market

On September 16, 2025, , ranking 270th in market activity among listed stocks. The bank’s shares faced downward pressure amid a broader sector selloff driven by rising borrowing costs and regulatory scrutiny over capital adequacy ratios. Analysts noted that the decline aligned with recent trends in regional banks, which have struggled to balance loan growth with asset quality concerns in a high-interest-rate environment.

Market participants observed that the sell-off accelerated after a key regulatory filing highlighted potential liquidity risks in the firm’s mortgage portfolio. While the company emphasized its strong balance sheet, investors remained cautious over macroeconomic uncertainties, including the Federal Reserve’s hawkish stance. The volume surge suggested increased short-term positioning but lacked confirmation of long-term bearish sentiment.

To run this back-test I need to pin down two practical details that weren’t fully specified: 1. Universe • Should the “top 500 stocks” be selected from all U.S.–listed common stocks, or do you want to restrict the universe (e.g., S&P 500 constituents, NASDAQ-100, etc.)? ; retrieving every ticker’s volume series is possible but takes longer. 2. Trade timing convention • Buy at today’s close and sell at tomorrow’s close (close-to-close one-day hold), or • Buy at today’s open and sell at today’s close (open-to-close intraday hold)? If you’re happy to let me choose reasonable defaults, my standard approach would be: • Universe: all U.S. common stocks with at least 20 days of trading history on the rebalancing date. • Execution: enter at today’s close, exit at next day’s close (close-to-close). Please let me know if these defaults work for you or specify the alternatives you prefer—then I’ll start the data pull and back-test.