AI Stock Sell-Off Sends S&P 500 to Worst Day Since 2025

A sharp sell-off in artificial intelligence stocks dragged the broader U.S. market lower on November 5, with investors focused on concerns about spending on AI. The S&P 500 fell more than 4%, marking its worst day since Trump announced tariffs in 2025.

The decline came as questions about the scale of investment in artificial intelligence weighed on technology shares. The market reaction put AI spending at the center of the day’s trading, though no further details about the concerns or the companies affected were provided.

The drop was a sharp reversal from a recent market surge tied to election results. By November 5, unease over AI investment had instead driven a broad market sell-off, with the S&P 500’s fall exceeding 4%.