The debut mobile ad spend study from the Internet Advertising Bureau and PricewaterhouseCoopers will be without data from Google after it refused to submit revenue figures.
The report, due out in April, will provide information about the overall size of the market as well as which sectors are spending on mobile.
Google has a global policy which means that it only discloses figures when required to do so by law.
Google provides its spend to the IAB/PWC Internet Advertising Revenue Report because – as its UK revenues exceed 10% of its total gross revenues – it is required by the US Securities and Exchange Commission to disclose them.
Jonathan Mew, head of mobile for the IAB, told newmediaage: “The study will finally accurately answer the question of how much is spent on mobile advertising and provide the base on which we can measure growth.
“It’s a shame Google won’t take part but I appreciate the decision as it is part of a global policy,” he added.