Are you familiar with the Royal Ballet? They are based at the Royal Opera House in London.
Not really, who are they run by?
They're currently run by a man named Kevin O'Hare. He's doing a good job, too - they're currently one of the foremost ballet companies.
I see, are they the largest ballet company in the world?
I'm not sure about the world, but they are the largest of the four major ballet companies in Great Britain.