Agencies

The 4 Largest Holding Companies Are Now Involved in Federal 'Bid Rigging' Probe

WPP confirmed subpoena today

By Patrick Coffee

December 19, 2016

The federal government's investigation into allegations of antitrust practices at major ad agencies has expanded to include WPP, the world's largest holding company.

Patrick Coffee

Patrick Coffee is a senior editor for Adweek.

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