Steve Howe - Yes, GTR, Asia, ABWH
Phil Collins - Genesis, Solo, Peter Gabriel
Jon Anderson - Yes, Solo, Jon and Vangelis, ABWH
John Wetton - Asia, Wishbone Ash, Uriah Heep, King Crimson
Bill Bruford - Yes, Earthworks, Genesis, King Crimson, ABWH

May have seen these guys elsewhere too but memory's fading.

Edited after the prompt from Roger.......D'oh!!!!!!!!!