Finland-based Rovio Entertainment Oy, maker of the “Angry Birds” mobile games and movie, is said to be planning an IPO valued at $2 billion as early as September. “A listing would test investors’ appetite for entertainment software, a group whose shares have declined an average of 18 percent from their offer prices following IPOs this year,” reports Bloomberg, citing social gamer King Digital Entertainment (creator of “Candy Crush”) and South Korean publisher Netmarble Games (maker of “Lineage” and “Stone Age”) as examples. A successful IPO for Rovio could help finance “The Angry Birds Movie 2,” slated for a 2019 release.