If Brendan Whitworth continues to oversee a market cap loss fall of $24 billion in 13 days, he won't be CEO very long.
Whitworth is the CEO of a subsidiary, so its market cap does not move at all. The Brazilians in Belgium control the company that has a market cap(I know that sounds like a bizarre combination, but it is accurate).
Doukeris has seen a 11.4% rise in the market cap in just a month. With that sort of success, there is no way he is losing his job.
