I started digging into companies with Co-CEOs and found this: "Research by consulting firm Mercer found that as of the end of 2008, just 34 of 6,487 public firms, or 0.5 percent, had co-CEOs."
Do you have a link?
Atlassian is also run by two CEOs
SAP did pretty well under co-CEOs.
It worked pretty good for MySpace... oh wait
Which company was that?
My guess is BlackBerry/Research in Motion.
RIM
Probably RIM.
Probably RIM/Blackberry.
Workday did it for about 8 years. Dave Duffield and Aneel Bhusri did pretty well, with Dave just stepping down a few months ago.