NEW YORK—Wall Street staged a surprising comeback Friday, with the major indexes jumping more than 5 percent and the Dow Jones industrials surging nearly 500 points in a late afternoon rally, ending another volatile week that saw stocks reach six-year lows.

Stocks erased about half of the losses that came in steep selling Wednesday and Thursday after investors got an unexpected jolt of confidence late Friday following an NBC News report that President-elect Barack Obama plans to name New York Federal Reserve President Timothy Geithner as Treasury secretary.

Investors ha...

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