BENTONVILLE, Ark. -- Shares of Wal-Mart Stores here may be subject to significant volatility as fund managers adjust their portfolios after ratings firm Standard & Poor's shifts the weighting of the S&P 500 Index, said Deborah Weinswig, retail analyst with Citigroup Smith Barney, in a research report. The changes in the S&P 500 involve a "full-float" adjustment, where shares available only for open-market trading will be counted in the index. Weinswig predicted Wal-Mart will be ...

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