Mike Williams for Gamesindustry.biz:

According to independent analyst firm Canalys, 25 developers pocketed 50 percent of US app revenue during the first 20 days of November 2012. The total revenue shared between those 25 developers amounted to $60 million in paid downloads and in-app purchases. The numbers are based on Canalys’ daily App Interrogator surveys of the Apple App Store and Google Play.

Only one of the 25 (Pandora) wasn’t a game developer, according to the report. The top earners included Angry Birds developer Rovio and social game factory Zynga.