Yes.
Stagecoach have been a very good investment, and FirstGroup a bad one, with GoAhead somewhere in the middle. Of course, all of these companies have interests beyond UK rail. For example, both Stagecoach and First own yellow school bus businesses in the USA, whilst National Express have a large Spanish coach business.
It's off topic, but over the last six years Stagecoach sold the East London Bus Group, then re-purchased it for about a third of the price! Whatever you think of him, Mr Souter is a canny businessman.