The Dow Jones Industrial Average, after losing 1.74 percent Tuesday, was up 149.70 points (1.28 percent) to 11,856.32 in the first five minutes of trade.
The tech-heavy Nasdaq Composite rose 26.32 (1.00 percent) to 2,664.74, while the broader S&P 500 added 13.86 points (1.13 percent) to 1,242.91.
"Buying interest comes despite a weak finish to the prior session and angst about how members of the European Union will achieve any plans developed today during a summit, which has been arranged to produce a framework for dealing with Europe's debt crisis and precarious financial conditions," said analysts at Briefing.com.
Shares in Amazon dropped 10.3 percent after it reported a 73 percent fall in profits in the third quarter after the market closed Tuesday.
Copyright AFP (Agence France-Presse), 2011