AT&T to Split Into Four Separate Companies

Updated from 9:34 a.m. EDT

In a widely anticipated attempt to make prominent the performance of each of its several business units, AT&T (T Quote), the nation's largest telecommunications company, will voluntarily split itself into four separate companies, it said Wednesday.

Under the plan, details of which were reported all week before the AT&T board voted to approve it Tuesday, each of the company's major units would become a publicly traded entity.

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