JPMorgan CEO warns America is leaning too hard on AI

JPMorgan’s strategy chair has a message for the country’s most crowded trade: America relies too much on AI. The case JPMorgan is building The most pointed piece came from CEO Jamie Dimon. In an October 6, 2026, interview, he said cyber risks have increased tenfold since Anthropic launched its Mythos AI model. Dimon described cyber threats as the bank’s “biggest risk.” The market-side concerns came earlier. JPMorgan research published in June 2026 flagged four major risks in the AI market. Among them was a sharp gap between semiconductor stock prices and their historical averages. The research also pointed to unprecedented hedge-fund investment in chips. Another flagged risk was a sharply escalating margin loan landscape in Korea. A market that runs on a handful of names The ten largest US companies now account for roughly 40% of the S&P 500’s total market value. Back in 2015, that share was 17%. Since ChatGPT debuted in 2022, around 42 AI-focused S&P 500 companies have accounted for 65-80% of the index’s profits and overall expenditures. Joyce Chang, JPMorgan’s Chair of Global Research, has highlighted AI’s large role in US GDP growth. Chang attributed nearly 30-40% of ear...