Why Nvidia, Micron, AMD stocks are down pre-market after SanDisk shock

Nvidia, Micron and AMD slipped in US pre-market trading on Thursday after SanDisk's outlook triggered a retreat across artificial-intelligence and memory-chip shares. At 5.30am ET, Nvidia was slightly lower, Micron had fallen 3.3% and AMD was down 1.9%, while SanDisk tumbled more than 9%.