J.P. Morgan warns that there are "signs of investor exuberance" in AI markets. Just 42 AI companies in the S&P 500 account for 65 to 80 percent of the index's total profits. The semiconductor rally is flashing technical patterns last seen during the dotcom bubble, and leveraged chip ETFs have quintupled their market influence since early 2024. The bank sees multiple layers of concentration risk across markets, infrastructure, and the economy.

JPMorgan's midyear outlook argues the hyperscalers are profitable, the debt markets are holding, and the cycle has room to run.

Jefferies warns that China's affordable AI models could disrupt US tech giants, impacting investor confidence and slowing revenue growth.

J.P. Morgan warns that there are "signs of investor exuberance" in AI markets. Just 42 AI companies in the S&P 500 account for 65 to 80 percent of the index's total profits. The…

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