Electronic Arts, the second-largest video game company in the U.S., is stealing market share away from Zynga, the top dog in social games on Facebook, according to a new report on gaming behavior.

The report, released on Wednesday, is based on data that tracks the game play of more than 10 million users of Raptr, a website that automatically tracks its users’ video game activity on Facebook, consoles and PCs.

 “EA has stolen 10 to 25 percent playtime from Zynga’s top games,” the report said.

Since the launch of Sims Social, EA’s Facebook game that has more than 66 million monthly active users, Zynga games such as FarmVille, CityVille and Empires & Allies have all lost players, the report shows.

To be sure, Zynga still dwarfs EA’s users on Facebook by more than 2-1 according to the website AppData.