Opera Software announced today that it has acquired Mobile Theory Inc. and 4th Screen Advertising, Ltd., to significantly expand its offering to advertisers and mobile publishers that engage consumers via the mobile web and applications, across all mobile platforms. Opera offers complete advertising solutions for mass-market feature phone and smartphone platforms, including iOS, Android, Blackberry, Java and Symbian.

Additionally, these acquisitions will enable Opera to better monetize the traffic that flows through Opera Mini and Opera Mobile browsers. With the world's most popular mobile browser, Opera serves more than 160 million monthly active users that generate more than 100 billion page views, and consume more than 16 Petabytes of mobile data services a month, as of December 2011.

Mobile Theory is a leading premium mobile advertising network focused on the U.S. mobile advertising market, based in San Francisco, with offices in New York City, Chicago, Los Angeles and Seattle.

4th Screen Advertising is a leading premium mobile advertising network focused on serving the European mobile advertising markets, based in London.

"This is yet another important step in Opera's quest to create even more economic value in the mobile ecosystem. Two years ago, we announced the acquisition of AdMarvel - which has grown to become the global leader as a supply-side platform (publisher platform) for mobile advertising. Last year, Opera helped generate well over $200 million in revenue for our publishers globally," said Lars Boilesen, CEO, Opera Software.

"Today, we are announcing the acquisition of two great demand-side platforms for mobile advertising. With these assets, and our very popular mobile browsers, Opera is uniquely positioned to deliver end-to-end mobile advertising solutions to brands, agencies, publishers and mobile operators across the globe. We are delighted to welcome the Mobile Theory and 4th Screen team to the Opera family."