Amazon Shares Climb 1.55% as $10.48B Volume Surges to No.4 Amid Cloud Expansion and Regulatory Tensions

On October 8, 2025, Amazon (AMZN) saw a 1.55% price increase with a trading volume of $10.48 billion, representing a 51.79% surge from the previous day's volume. The stock ranked fourth in overall trading activity across the market.

Recent developments highlight Amazon's strategic investments in cloud infrastructure expansion, with the company announcing an additional $12 billion allocated to data center development in North America. Analysts noted the move aligns with growing enterprise demand for AI-driven computing resources, though the timing coincides with broader sector volatility amid mixed Q3 earnings reports from tech peers.

Regulatory scrutiny remains a key overhang, as the European Commission signaled potential adjustments to its antitrust case against Amazon's marketplace practices. While no immediate penalties were outlined, legal experts suggest the evolving framework could influence future capital allocation decisions and operational margins.

To run this back-test accurately, implementation parameters require clarification: defining the market universe (e.g., U.S. equities scope), entry/exit pricing assumptions (intraday vs. close-to-close execution), weighting methodology (equal-weight vs. volume/market-cap based), trading friction specifications (commission/slippage rates), and benchmark selection (e.g., SPY for relative performance). Once these details are finalized, the back-test will generate a daily trade list for evaluation from January 1, 2022, through the current date.