SYDNEY, May 19 (Reuters) - Australia's two biggest billboard companies on Friday called off a deal in which APN Outdoor Group Ltd APO.AX would buy rival oOh!media Ltd OML.AX for A$735 million ($544.93 million), after the antitrust regulator raised concerns.
The companies said in a statement that they disagreed with the view that a tie-up would harm competition but that regulatory invervention "represents an unacceptable risk to a successful merger". ($1 = 1.3488 Australian dollars)