Stock Market Today: Nasdaq Sinks 350 Points; Google Stock's Tumble in Focus — Live Updates

Alphabet shares are suffering their worst day ever, putting the Google parent on course to shed roughly half a trillion dollars in market value after earnings disappointed investors.

The selloff is dragging the broader tape. The Nasdaq Composite is down about 350 points, with Alphabet's tumble the focal point of the session. The Dow Jones Industrial Average and S&P 500 are also in focus as traders react to the move.

The scale matters. A half-trillion-dollar value loss in a single session signals that the earnings report broke sharply against positioning, and the market is repricing the stock in real time. Interpretation: a drop of this size in a mega-cap name can transmit pressure to index-level performance, which is consistent with the Nasdaq's 350-point slide, though the source does not attribute the full decline to Alphabet alone.

The record-setting nature of the drop is the key datapoint. This is Alphabet's worst single-day performance on record, not simply a bad day, which suggests investors judged the earnings miss as significant rather than routine.