NVIDIA Corporation

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Bullish +65

Nvidia and Micron Have Driven the S&P 500’s 2026 Rally to Record Highs. History Says It’s Not Over

AI-generated analysis

📈 The S&P 500 has notched 25 all-time highs in 2026 alone, driven by a third consecutive year of double-digit total returns.

🚀 Nvidia (NVDA) contributed 15.5% to the index's gains in 2025 due to its enormous market weight and solid performance.

💾 Micron generated nearly as much index-level contribution as Nvidia despite having a fraction of its weight, posting a 208% return.

🔗 Nvidia and Micron are riding the same underlying AI demand wave, with Micron's memory chips feeding directly into Nvidia's data center business.

📊 Analysts are raising 12-month EPS estimates at an unusually fast pace, supporting the index's continued upward momentum.

⚠️ Historical data shows a 76.5% probability of positive returns following fresh highs, but investors must remain cautious of potential valuation reversals.

Bullish Signals
  • Nvidia contributed 15.5% to the index's gains in 2025 due to its enormous market weight and solid performance.
  • Nvidia is riding the same underlying AI demand wave as Micron, benefiting from the massive buildout of AI data centers.
Full Analysis
The S&P 500 has reached record highs in 2026, driven significantly by strong earnings growth and a streak of double-digit annual returns. Analysts are rapidly raising 12-month EPS estimates, contributing to a total return of 13.7% through August 7. While the index's forward price-to-earnings ratio has expanded alongside its gains, indicating that valuation multiples play a role, the underlying earnings strength remains the primary engine for this historic rally. Nvidia (NVDA) and Micron have been the primary drivers of the index's performance, though their roles differ. Nvidia contributed 15.5% to the index's gains in 2025 due to its substantial weight, delivering solid but not spectacular returns. In contrast, Micron generated nearly as much index-level contribution despite having a fraction of Nvidia's weight, posting a massive 208% return that moved markets significantly from a smaller starting position. The article highlights the strategic link between these two companies, noting that Micron's high-bandwidth memory chips feed directly into the AI data center buildout powering Nvidia's business. This shared demand wave suggests their fortunes are closely linked within the supply chain. Historical data indicates a 76.5% probability of positive returns following fresh highs, though investors are cautioned to avoid complacency given past exceptions like the 2007 market crash.