September Trends: Analyzing S&P 500 Declines and Their Impact on AI Stocks

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Market Trends and Investor Insights for September

The S&P 500 has historically declined in September, falling 56% of the time since 1928, with an average return of negative 1.17%. Despite this trend, companies like Nvidia and Micron Technology present significant growth opportunities amid the so-called “September Effect.” Nvidia’s fiscal Q2 2027 revenue more than doubled to $96.2 billion, with non-GAAP earnings up 120% to $2.22 per share. Micron, set to report its fiscal Q4 2026 results on September 23, forecasts $50 billion in revenue, marking a 342% increase year-over-year.

Additionally, Nvidia continues to dominate the data center GPU market with an estimated 86% share, while Micron is the third-largest global DRAM supplier with 22% market share. The ongoing investment in AI technologies—projected at $1.3 trillion next year by large tech firms—positions both companies favorably for future growth.

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