Three Years of AI Mania: How ChatGPT Reordered the Stock Market

Published on November 26, 2025

The release of OpenAI's ChatGPT three years ago sparked an artificial intelligence mania on Wall Street, fundamentally reshaping the stock market landscape. This AI-driven frenzy has minted new market leaders, made the S&P 500 significantly more concentrated, and served as the dominant driving force behind the current bull market in US stocks.

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