U.S. stocks fell on Thursday as investors' renewed optimism on big tech names, driven by a slew of strong earnings, took a turn down after Facebook-parent Meta Platforms reported disappointing quarterly results.

Losses deepened by the afternoon, with the Nasdaq Composite falling 3.7% to 13,878.82 for its worst day since September 2020. The S&P 500 had its worst day in nearly a year, sliding 2.4% to 4,477.44, with tech shares as the biggest drag. The Dow Jones Industrial Average fell 518.17 points, or 1.4%, to 35,111.16.