Activision Publishing, Inc. is an American video game publisher. It was founded on October 1, 1979 and was the world's first independent developer and distributor of video games for gaming consoles. Its first products were cartridges for the Atari 2600 video console system published from July 1980 for the US market and from August 1981 for the international market (UK). Activision is now one of the largest third party video game publishers in the world and was also the top publisher for 2007 in the United States. On January 18, 2008, Activision announced they were the top US publisher in 2007, according to the NPD Group.Its former CEO is Robert Kotick, who was the Chief Executive Officer of Activision, Inc. since February 1991 until Activision and Vivendi Games merged on July 9, 2008 to create the newly formed company known as Activision Blizzard. On July 25, 2013, Activision Blizzard announced the purchase of 429 million shares from owner Vivendi, valuing US$2.34 billion. As a result, Activision Blizzard became an independent company.HistoryBefore Activision, third-party developers did not exist. Software for video game consoles were published exclusively by makers of the systems for which the games were designed. For example, Atari was the only publisher of games for the Atari 2600. This was particularly galling to the developers of the games, as they received no financial rewards for games that sold well, and did not receive credit for their games.