The major players in gaming industry

Video game companies are fighting it out for a slice of an industry worth an estimated $300 billion, with a series of acquisitions leaving four giants and a clutch of feisty independents.

Regulators are still poring over Microsoft’s proposed acquisition of Activision Blizzard, the biggest buyout in video game history, and on Monday Japan’s Sega said it would buy the Finnish maker of “Angry Birds” for more than $770 million.