that it owned Blizzard Entertainment and its highly successful World of Warcraft game, which was drawing in a year in subscription fees. Vivendi Games also owned Sierra Entertainment. Lévy recognized Kotick wanted control of World of Warcraft, and offered to allow the companies to merge, but only if Lévy held the majority shares in the merged group, forcing Kotick to cede control. Kotick fretted about this decision for a while, according to friends and investors. During this time in 2006–2007, some of Activision's former successful properties began to wane, such as Tony Hawk's, so Activision bought RedOctane, the publisher of the Guitar Hero franchise. Kotick met with Blizzard's president Mike Morhaime, and learned that Blizzard also had a successful inroad into getting their games into China, a potentially lucrative market. Given this potential opportunity, Kotick agreed to the merger. Activision's board signed on to the merger by December 2007. The merger was completed in July 2008. The new company was called Activision Blizzard and was headed by Kotick, while Vivendi maintained a 52% share in the company. The new company was estimated to be worth , ahead of Electronic Arts, which was valued at . Post-merger developments (2009–present) Activision Publishing remains a subsidiary of Activision Blizzard following the merger, and is responsible for developing, producing, and distributing games from its internal and subsidiary studios. Eric Hirshberg was announced as Activision Publishing's CEO in 2010. Activision Publishing established Sledgehammer Games in November 2009. Formed earlier in 2009 by Glen Schofield and Michael Condrey, former Visceral Games leads that had worked on Dead Space, Sledgehammer intended to develop a Call of Duty spin-off title fashioned after the gameplay in Dead Space. However, in early 2010, legal issues between Infinity Ward and Activision Blizzard led to several members of Infinity Ward leaving, and Activision assigned Sledgehammer to assist Infinity Ward in the next major Call of Duty title, Modern Warfare 3. Since then, Sledgehammer, Infinity Ward, and Treyarch share development duties for the flagship series, with support from Raven and other studios as necessary. In February 2010, Activision Blizzard reported significant losses in revenue stemming from a slow down in Guitar Hero sales and from its more casual games. Subsequently, Activision Publishing shuttered Red Octane, Luxoflux and Underground Development as well as laid off about 25% of the staff at Neversoft. Within the same year, Activision shuttered Budcat Creations in November 2010, and