S&P 500 Falls 3.8% as AI Stocks Drag Wall Street Lower

The timing is the story here: a record-celebration followed within a day by a drop steep enough to put emergency halts back in the conversation is a sharp reminder that AI-linked equities have become the market's main swing factor. The move matters most for anyone whose exposure is concentrated in that theme, since the index-level damage traces back to a narrow leadership group. Whether the pullback stays contained to AI names or broadens into the wider market is the open question worth watching.