MarketWatch
Tech stocks log worst day since 2020 as carnage comes to the AI trade
Thursday, November 5, 2026
The S&P 500 declined by an estimated $2.9 trillion in market capitalization in a single trading session, marking the largest one-day loss of market value on record. Technology stocks accounted for a significant portion of the decline. The selloff affected companies across multiple sectors including artificial intelligence, cloud computing, and semiconductor manufacturing.
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