If its "AGCO", & not AGGO they own a gazillion companies. Just for starters...
2) Deutz Allis
3) Agco Allis
5) New Idea
8) Massey Ferguson
That's just for starters. I don't know about New Holland; Someone told me back in the summer that Case-IH tractor division is up for sale! Said they were asking too much for it though.