AI stocks sell off sharply, sending the S&P 500 down 4.4%

Summary

A steep sell-off in artificial intelligence stocks sent Wall Street reeling on Nov. 5, with the S&P 500 tumbling 4.4%. MarketWatch reported that tech stocks logged their worst day since 2020 as the AI trade came under pressure, and that the S&P 500 lost an estimated $2.9 trillion in market capitalization, the largest one-day loss of market value on record. The available reports do not detail what triggered the sell-off.

Timeline

1. CNA

   5 Nov 2026, 21:56 UTCSource ↗

   CNA reports that a brutal sell-off in AI stocks sent Wall Street reeling and that the S&P 500 tumbled 4.4%.

2. MarketWatch

   5 Nov 2026, 22:00 UTCSource ↗

   MarketWatch reports that tech stocks logged their worst day since 2020 as carnage hit the AI trade, with the S&P 500 losing an estimated $2.9 trillion in market capitalization, the largest one-day loss of market value on record.