Advertisers move to rein in agencies over hidden media profits

The number that stands out in the WPP whistleblower filings isn’t the $100 million the complaint is seeking, or even the $1 billion GroupM was allegedly generating annually from undisclosed trading income. It’s 97.4% — the share of GroupM’s proprietary inventory that its own largest clients weren’t allegedly using. Google, its biggest U.S. client at

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Published by digiday.com