Also. . .

AT&T; Corp.’s $10-billion wireless tracking stock is poised to debut in a shaky market that has pushed the majority of newly public companies below their offering price and forced other businesses to scrap their initial public offerings altogether. The behemoth IPO is expected to be the largest in U.S. history, about twice the size of the $5.5-billion IPO of United Parcel Service Inc. in November. The offering of the tracking stock, which will reflect AT&T;’s mobile and fixed-wireless telephone operations, is tentatively set to price Wednesday and begin trading under the symbol “AWE” on Thursday on the New York Stock Exchange.

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The London Stock Exchange, Europe’s biggest, is expected to announce in the coming days whether it has agreed terms for a merger with Deutsche Boerse that would create a pan-European trading platform for stocks.