I have written previously about the fact that more S&P 500 CEO’s are engineering majors than any other discipline . The group putting out those studies have stopped doing so, unfortunately. There is a new study  based on mining Facebook data and the results again show engineers doing very well.
I wish  they provided data for the larger companies, but they don’t. They show a breakdown of 9,461 (CEO or founders) with a business undergraduate major and 9,334 with an engineering degree. For those with advanced degrees 3,337 have an engineering master’s or doctorate and 1,016 have an MBA.
In the latest (2008) data I have for S&P 500 CEO’s 22% were engineers. Engineers seem to make up under 5% of college graduates (based on my eyeballing of this Dept. of Education data ). Business meanwhile seems to make up about 20% of the majors.
See more posts looking at science and engineering careers : Future Prospects for Engineers  – Engineering Again Dominates The Highest Paying College Majors  – Science and Engineering in Global Economics  – Career Prospect for Engineers Continues to Look Positive