Atari has been two separate companies since 1984!
Atari Corp. -> JTS -> Atari Interactive (Hasbro) -> Infogrames Interactive (Infogrames) -> Atari Inc (nee Infogrames) -> Atari SA (nee Infogrames)
– Owns home computer and console properties.
– Also has rights to pre-1984 Atari arcade games, such as Asteroids and Centipede.
Atari Games (Warner) -> Atari Games (Namco) -> Atari Games -> Atari Games (Time Warner Interactive) -> Atari Games (WMS Industries) -> Midway Games West (Midway) -> ??? (Warner)
– Has done some home conversions under different names, such as Tengen.
– Owns 1984 and later Atari arcade games, such as Gauntlet, Paperboy and Marble Madness.
– Once shared rights to pre-1984 Atari arcade games, not sure if that still applies.
Ministry of xAD 