Here's the list of companies complaining to the EU about Google's dominance of the ad tech market (GOOG, MSFT, WPPGY)

Several of Google's ad tech rivals — including Microsoft, WPP's AppNexus, and OpenX —  have asked European regulators to investigate the company's dominance of the online display advertising space, The Financial Times reports.

The companies visited the European Commission in recent months and submitted documents in the hope of prompting an antitrust probe, although they have yet to file a formal complaint, according to the report. 

A Google spokesperson told Business Insider: "We...

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