From AI boom to valuation worries: Why investors are rethinking big tech bets

Nvidia shares fell nearly 5%, dragging semiconductor stocks lower as investors reassessed AI valuations. Apple reclaimed the title of world's most valuable company, with investors rotating away from AI-linked stocks toward companies with steadier earnings profiles. Concerns around circular financing, rising competition from China's CXMT, and questions about returns on massive AI infrastructure spending are fuelling a broad-based tech selloff.