S&P 500 and Nasdaq Near Records on AI-Led Rally

On September 21, 2026, the S&P 500 and Nasdaq surged toward record highs, according to Reuters. Gains in Advanced Micro Devices and other AI stocks lifted Wall Street. The Nasdaq rose 2%, with the Dow and S&P 500 higher, according to Yahoo Finance. Chip stocks rallied. I worry returns lean too heavily on a few leaders.