Bugatti is in the VAG group. Jaguar is Tata's. As for Koenigsegg:
http://www.nytimes.com/1997/01/26/we...pagewanted=all
I wouldn't put any American brands up there although on occasion some jewels have been produced by American brands, such as the Ford GT. Just like Renault and Peugeot have produced some nice cars but suck in general.
Just an observation/curiosity, definitely not a rule.