ADK Corporation (株式会社エーディーケイ), also known as Alpha Denshi Corporation (株式会社アルファ電子), was a Japanese video game company, very famous in the 1990s, who made various games mainly for SNK's Neo Geo platform, as many console games. The K in ADK comes from the Japanese term for "corporation", kabushiki kaisha. ADK made various video games for many genres, but their most popular works are their fighting games, particularly the World Heroes series.
ADK was created in July 1980 in Saitama, Japan. The first two arcade video games ADK created were Shougi (将棋), a basic, but well-developed Japanese chess game; and Janputer (ジャンピュータ), the world's first arcade Mahjong game, which was sold by Sanritsu Giken Corp. Afterwards, Sega and Tecmo would sell ADK-produced games through the early 1980s. In the later 1980s, ADK became something of a 2nd-party developer for SNK.
ADK made games for many genres, including sports, shooters, platformers, fighters, and beat 'em up games. The company became quite famous, with considerable success in North America.
In the early 1990s, ADK started developing many games for SNK's Neo Geo system. However, through the mid-90s, ADK failed to win very much success. The company eventually went bankrupt and closed its installations in early 2000 (SNK itself would declare bankruptcy the very next year). SNK ended up buying ADK's intellectual properties.