Apple shares tumble 9% on supply worries, on track for worst single-day fall in over 6 years

Apple shares plunged over 9% after the iPhone maker issued a weaker-than-expected outlook, warning that AI-driven component shortages are straining global supply chains. The stock is on track for its worst one-day fall in more than six years, putting nearly $500 billion in market value at risk and lifting Nvidia's valuation lead.