Chip stocks lose $200 billion as Lam Research supply warning offsets Nvidia optimism

The Philadelphia Semiconductor Index fell 6.72% on October 22, its worst session since summer, with all 30 members closing lower. Lam Research's CFO said supply constraints would trim quarterly revenue by roughly $300–400 million; Lam dropped 11.76% and Nvidia 4.4%.

• Philadelphia Semiconductor Index fell 773.58 points to 10,731.98
• Lam Research posted record revenue of $8.22 billion, up 54% year over year
• CFO estimated supply constraints cost $300–400 million in the quarter
• Nvidia fell 4.4%, AMD 8.1%, Arm 7.28%, KLA at least 10%