The visualization is a bit confusing, but it makes sense that the manager box is larger than the CEO box since as others have pointed out there are more managers than CEOs, however notice that the CEO box is noticeably darker than the manager box, indicating that CEOs are more likely to be in the 1% than managers.

It's not a terrific visualization. It's a bit difficult to compare box sizes and colors.

Companies have many managers, but one CEO.

Absolutely speaking managers rank higher, but that's a trivial figure considering there are significantly more managers out there than CEOs.

Relatively CEOs are better off than managers.

CEOs are also managers :)