The large majority of Georgia's media companies (including television, newspaper, and radio) are headquartered in Tbilisi. The city is home to the popular Rustavi 2 television channel which gained considerable fame after its coverage of the Rose Revolution. In addition to Rustavi 2, the remaining three out of the four major public television channels of Georgia (including Imedi TV Maestro and the Public Broadcasting Channel) are based in the city. Tbilisi's television market has experienced notable changes since the second half of 2005 when Rustavi 2 successfully bought out the Mze TV company and Rupert Murdoch's News Corporation became a shareholder of Imedi Media Holding at the beginning of 2006.