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Visa (V) closed lower by 0.30% on October 8, 2025, with a trading volume of $1.37 billion, marking a 22.84% decline from the previous day's volume and ranking 67th among U.S. equities. The move reflected broader market dynamics amid evolving regulatory scrutiny in digital payment sectors.
Analysts noted that the decline coincided with a broader reassessment of high-growth fintech stocks as investors balanced macroeconomic signals with sector-specific risks. While no direct earnings or strategic announcements were reported, the stock's performance aligned with sector-wide volatility driven by regulatory discussions on cross-border transaction fees and data privacy frameworks.
To run this back-test rigorously I need to pin down a few implementation details: 1. Universe • Do you want to rank “all U.S.–listed common stocks” each day, or only those in a specific index (e.g., S&P 1500, Russell 3000, etc.)? 2. Ranking metric • Treat “trading volume” as share volume or dollar volume (price × shares)? 3. Portfolio construction • Equal-weight the 500 names each day, or weight them by volume (or another metric)? 4. Trading assumptions • Use official close-to-close returns (i.e., buy at today’s close, liquidate at next day’s close)? • Any commission/slippage assumptions to include? If you’re happy with reasonable defaults (all U.S. common stocks, rank by dollar volume, equal-weight, close-to-close, zero transaction cost), just let me know and I’ll proceed with that configuration from 2022-01-03 through today.

Hunt down the stocks with explosive trading volume.

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