Salomon Smith Barney Inc. said it will begin offering extended trading hours through New York firm MarketXT in the "near future."

The announcement by the Citigroup unit comes just days after Mellon Bank Corp.'s Dreyfus Brokerage and Discover Brokerage, a unit of Morgan Stanley Dean Witter & Co., went live with a 6 p.m. to 9 p.m. trading session for retail investors. Both are discount brokers.

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