Costco Shares Climb 1.15% on Dwindling Volume as Stock Falls to 54th in U.S. Volume Rankings

On September 17, 2025, , . . equities in terms of trading volume, reflecting uneven investor engagement despite the positive price movement.

Recent market dynamics suggest mixed sentiment toward the retail giant. While the volume contraction indicates reduced short-term speculative activity, the modest price appreciation hints at underlying demand from core investors. Analysts note that Costco’s performance remains tethered to broader consumer spending trends, with no material earnings or strategic updates reported in the immediate term.

To run this back-test rigorously I need to nail down a few implementation details: 1. Universe • Which market should we scan each day for the “top-500 by trading volume”? – e.g. all U.S. common stocks (NASDAQ + NYSE + AMEX), or another exchange/region? 2. Weighting & sizing • Should the 500 names be held in equal weights (i.e. , , or something else? • Are we investing the full notional every day, or capping position size / turnover? 3. ? ? 4. Transaction costs / slippage • Do you want to model commissions or a bid-ask spread? If you don’t specify, I’ll assume zero to isolate the pure signal. .