Ford : They own Ford , a large portion of mazda , volvo - land rover , jaguar , aston martin ( i think ) Mercury , lincon + other monor companies i think
GM - Chev pontiac Buick cadilac opel Holden
Fiat - Fiat ferrari Maserati + others
Dailmer Chrysler - Dailmer Chrysler dodge (mercedes ?)(bently ?)
BMW owns rolls royce + range rover , Mini's + (MG's?)
Proton Own Lotus
Toyota - seperate
Mitsubishi - seperate
Honda - seperate
Gaps need filling but thats a rough idea of who owns who