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Carlos Ghosn, CEO of Renault and Nissan, comes to mind.

https://en.wikipedia.org/wiki/Carlos_Ghosn

It must mean he committed to stepping down there. Maybe he just agreed to see it through the IPO then walk away? As another user said here, how many people have been the CEO of two public companies at once? (Would actually really like to know.)

The Two-Company CEO, Exotic but Not Extinct

By Marc Hogan

http://thirdcreekadvisors.com/wp/wp-content/uploads/2013/10/...

https://en.wikipedia.org/wiki/Steve_Jobs Apple & Pixar

Common misconception. Jobs was Pixar's main investor, but he never ran the company.