Chip firms plunge as AI stock sell-off deepens

Shares in major chip companies fell sharply in the US and Asia as a sell-off in AI-related stocks intensified. Trading on South Korea's Kospi was halted after sliding 8%, later falling nearly 10%. Samsung Electronics and SK Hynix both dropped over 10%. Nvidia lost its position as the world's most valuable firm to Apple after declining 5%. Analysts question AI profitability amid huge investments.