Nobody who is qualified to do it... I've worked with executives at that level, and let's face it-- most of us don't have the single-minded devotion to do it, nor the experience to manage thousands of people.
No-one is managing thousands of people.
You might have ~10 direct reports as CEO (common incident command theory says that number should be between 3 and 7, optimal around 5, because after that, you start to lose connectivity between what each report is doing).