And the ad network's tablet ad requests are up 140 per cent from 2011.
In February, Norwegian browser firm Opera delved deeper into the mobile space by acquiring ad networks 4th Screen and Mobile Theory.
And it's a move that seems to have paid dividends, as Opera now reports a 250 per cent revenue growth for Mobile Theory (MT) following the $18 million swoop.
Execs also pay tribute to an overall surge in business' understanding the importance of advertising across smartphones and tablets.
MT's user base – includes AOL, Chevrolet, eBay, Kellogg's, Microsoft – has risen by 75 per cent in the same period, and it claims clients have access to 40 billion monthly impressions, 9000 sites and apps, and 350 million mobile users.
The firm has also used the Opera backing to add an additional 15 members of staff to the team, with plans to double the headcount by the year's end, while new offices have been opened in Chicago and LA.
Scott Swanson, founder and CEO, Mobile Theory, said: "The trends we’re seeing are quite clear: Fortune 500 brands are adopting mobile display and video at a considerably more rapid pace than they moved into online advertising.
"And now they’re catering the brand experience for the specific nuances of the mobile medium, looking for the best ways to reach and engage their target customer. With our product and service offering, I’ve no doubt that we’ll continue on this record-breaking streak throughout the rest of the year."