JOAX-DTV, virtual channel 4 (UHF digital channel 25), branded as Nippon TV, is the flagship station of the Nippon Television Network System, owned-and-operated by the Nippon Television Network Corporation[b] which is a subsidiary of the certified broadcasting holding company Nippon Television Holdings, Inc., itself a listed subdisiary of The Yomiuri Shimbun Holdings, Japan's largest media conglomerate by revenue and the second largest behind Sony; Nippon Television Holdings forms part of Yomiuri's main television broadcasting arm alongside Kansai region flagship Yomiuri Telecasting Corporation, which owns a 6.4% share in the company.
Nippon TV's studios are located in the Shiodome area of Minato, Tokyo, Japan and its transmitters are located in the Tokyo Skytree. Broadcasting terrestrially across Japan, the network is sometimes contracted to Nittere (日テレ), and abbreviated as "NTV" or "AX". It is also the first commercial TV station in Japan, and it has been broadcasting on Channel 4 since its inception. Nippon Television is the home of the syndication networks NNN (for news programs) and NNS (for non-news programs). Except for Okinawa Prefecture, these two networks cover the whole of Japan.