Activision claims overall market share of 16.8% for that period, a massive year-over-year increase of 7.9%. Meanwhile, chief rival Electronic Arts' market share has waned somewhat in recent years, and its stock prices have grown at a slower rate than Activision's--though EA CEO John Riccitiello recently stated in a conference call that his company will hold 20% market share in North America and Europe during the third and fourth quarters.

Much of Activision's success is due to the astronomical success of the Harmonix-created, now Neversoft-developed, Guitar Hero franchise. Guitar Hero III: Legends of Rock proved to be the highest-earning title across all platforms; to some extent, the per-unit revenue on Guitar Hero games is increased due to the available packed-in hardware. Another Activision-published title, Infinity Ward's Call of Duty 4: Modern Warfare, apparently came in at the number two earnings slot. Meanwhile, the Guitar Hero franchise as a whole is said to be the highest-selling franchise of the year.

Today's announcement is likely to be particularly worrying to EA, since the performance it reports precedes the epic Activision/Vivendi merger that will result in megalithic Activision Blizzard. That newly-formed company is expected to top the industry in total revenues.