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Four top holding companies subjected to a Department of Justice probe into ad industry production practices say the investigations into their respective subsidiaries have been closed without any action being taken.

MDC Partners, Omnicom, Publicis Groupe and IPG have confirmed the investigations into their subsidiaries have been closed without any action taken. WPP declined to comment.

In 2016, the Department of Justice launched the probe into whether ad agencies were unfairly directing production business to their in-house departments over independent shops. Advertising agencies, which have been increasingly producing work for clients in-house, were being investigated for allegedly fixing the bidding process by encouraging production houses to increase their prices so the contract is given to the agency's in-house team.

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