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Dec. 4 (Bloomberg) -- The following companies had unusual price changes in U.S. trading . Stock symbols are in parentheses, and share prices are as of 4 p.m. in New York.

Shorter trading days in March and April, the result of a labor dispute, showed that trading volume did not fall despite the shorter hours.

Nasdaq OMX, the transatlantic exchange group, has lost its contract to supply trading technology to Norway's stock market to London Stock Exchange, despite owning 10% of the Nordic exchange.

Dec. 4 (Bloomberg) -- U.S. stock futures rose, indicating the Standard & Poor’s 500 Index may gain for a third straight day, as investors speculated central banks around the globe will step up efforts to revive the economy.