Amazon Stock Slips 0.78 as $8.79 Billion Volume Ranks Eighth Amid AI Expansion and Regulatory Scrutiny

On September 12, 2025, , ranking eighth in market activity. The stock’s performance coincided with key developments in its business strategy and market positioning. , a critical milestone for investor sentiment. CEO emphasized AI-driven efficiency in his annual shareholder letter, highlighting the importance of speed and removing operational roadblocks as core priorities. The company also introduced a new “Buy for Me” feature, enabling customers to purchase products from third-party retailers via the Amazon app, potentially expanding its retail ecosystem.

Amazon Web Services (AWS) announced the availability of Meta’s Llama 4 models, strengthening its cloud AI offerings. Meanwhile, regulatory scrutiny emerged as the U.S. Federal Trade Commission (FTC) reportedly investigated whether Amazon and Google misrepresented ad pricing practices. This probe could impact Amazon’s advertising revenue, a key growth driver. Additionally, Jassy’s recent memo on AI adoption signaled potential workforce reductions, sparking discussions about the technology’s disruptive role in corporate strategy. These factors collectively shape investor perceptions of Amazon’s short-term risks and long-term innovation trajectory.

The proposed backtest strategy—daily rebalancing a portfolio of the 500 highest-volume stocks—cannot be directly executed with current tools. Alternatives include using an ETF proxy for high-volume stocks or analyzing single-ticker effects post-high-volume days. The feasibility of these approaches depends on further refinement of the testing parameters.