Southern's 47% Volume Drop Pushes Stock to 308th Rank in U.S. Market Amid 1.3% Price Slide

On September 25, 2025, Southern (SCCO) traded with a volume of $0.37 billion, marking a 47.13% decline from the previous day’s activity. The stock closed at a 1.29% loss, ranking 308th in trading volume among listed equities. Market participants noted reduced liquidity as a key factor in the subdued session.

The decline in trading volume suggests diminished short-term investor interest, potentially reflecting a consolidation phase following recent price movements. Analysts highlighted that the stock’s position within the Russell 3000 or S&P 500 benchmarks could influence its exposure to broader market trends, though no immediate catalysts were identified to drive directional momentum.

To run this test rigorously I need to nail down a few practical details. Universe • “Top 500” could refer to all U-S listed shares, all ADRs, or perhaps the S&P 500. Our back-test engine works on a defined security list; pulling full-market volume every day is technically feasible but far heavier and slower than selecting a fixed universe such as “all securities in the Russell-3000” or “S&P 500 constituents.” Ranking convention • Do we select the 500 names with the greatest dollar volume (Price × Shares) or with the greatest share volume? • Is the ranking based on today’s volume and the trade executed at the next day’s open (typical implementation) or do you want to buy at today’s close immediately after the ranking is known?

Execution details • Entry price: next-day open or same-day close? • Exit price: following day’s close (i.e., 1 full trading day held) or following day’s open? • Transaction costs: should we assume zero, a fixed per-share cost, or a spread-based cost? Region / currency • I will assume U-S equities and U-S dollars unless you specify otherwise. If you confirm (or adjust) these points, I can generate the retrieval plan and run the back-test.