When the Dow surged 932 points, or 2.81%, and the S&P 500 gained 2.99% for their biggest gains since 2020.
The Nasdaq Composite jumped 3.19%.Those gains had all been erased before noon in New York on Thursday.
Large tech stocks were under pressure, with Facebook-parent Meta Platforms and Amazon falling nearly 6.8% and 7.6%.
Microsoft dropped about 4.4%. Salesforce tumbled 7.1%. Apple sank close to 5.6%.
E-commerce stocks were a key source of weakness on Thursday following some disappointing quarterly reports. The declines dragged Nasdaq to its worst day in nearly two years.