In a rare public disclosure revealing the financial relationship between a big agency holding company’s media operations and a digital media supplier, WPP’s GroupM is listed as the single biggest creditor in Videology’s bankruptcy filing.

Three of GroupM’s offices — including GroupM UK, Finecast Limited, and GroupM Worldwide — are listed as the first, second and fourth-biggest creditors, respectively, with claims totaling more than $35 million due the agency from Videology, a supplier of programmatic video advertising.

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