Automatic Data Processing Inc.’s (ADP) planned $500 million takeout of ProBusiness Services Inc. could stumble because of antitrust concerns. But that will depend on how regulatory agencies view the $5 billion-in-annual revenue payroll processing market, said industry sources. A week ago, Roseland, N.J.-based ADP, a $24 billion market cap payroll processing company, inked a definitive to acquire fellow payroll processor ProBusiness for $17 a share cash. The Jan. 6 announcement skyrocketed Pleasanton, Calif.-based ProBusiness’s stock about 66% to $16.50. At press time, the euphoria of the news wearing off, ProBusiness stock closed down at $16.21. The company could not be reached for comment.

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