NEW YORK — Wall Street has pulled off a rebound in another turbulent session, as investors rushed back into the market after the Standard & Poor's 500 index tested a 2003 low.

The market, which had been down four of the past five sessions, has been volatile amid worries about how long a recession might be. That's driven many retail investors to the sidelines, while big institutional traders such as hedge funds keep major stock indexes vacillating.

Stocks rallied in the final hour of trading in part because fund managers whose portfolios are tied to the S&P 500 had to find a replacement for Anheuser-Busch Cos. The brewer was officially acquired by Belgium's InBev SA for $52 billion.

The Dow rose 151 points to the 8,425 level.