The S&P 500 has rebounded to a 9% gain in 2026, driven by a massive surge in semiconductor stocks and AI-linked companies that are fueling a potential market melt-up.

Key Points

• The S&P 500 recovered from a 7% year-to-date decline in March to reach a 9% gain by May 2026.
• Semiconductor stocks now represent 22% of the S&P 500, a significant increase from 6% in April 2025.
• Sandisk shares have surged 4,100% over the past year, while Western Digital and Micron have gained 1,000% and 777% respectively.
• South Korea’s stock market has grown by 240% in one year, now surpassing the United Kingdom in total market capitalization.
• Market growth is currently supported by rising earnings expectations, particularly within AI-linked sectors like SK Hynix and Samsung.

Why it Matters

The rapid vertical growth in AI-related equities suggests the market may be entering a "melt-up" phase characterized by extreme investor enthusiasm. While these gains are currently supported by strong corporate earnings, the concentration of value in specific sectors highlights significant shifts in global market influence.