Near 2030 GMT, the Dow Jones Industrial Average was at 24,770.09 up about 425 points, or 1.7 per cent, just off its session highs in a day of dramatic lurches in both directions.
The broad-based S&P 500 gained 1.3 percent to 2,683.32, while the tech-rich Nasdaq Composite Index advanced 1.2 per cent to 7,084.66.
Market insiders were still coming to terms with yesterday's chaotic session, in which the blue-chip index lost more than 1,000 points in about an hour at one stage on the way to its biggest point drop ever.
"The market is probably trying to find a bottom," said Bill Lynch, director of investment at Hinsdale Associates. "Today has been particularly volatile, trading between positive and negative territory all day long. It's like a yo- yo."
But inevitably investors took advantage of the low prices to come back into the market, sending the key indexes higher.
And Lynch described yesterday's move as a "long-awaited correction," not the sign of a true shift in economic outlook.
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