Typically at a top-20 MBA school roughly 5-10% of graduates start businesses. LBS run an entrepreneurship summer school which concentrates on the entrepreneurs

Typically at a top-20 MBA school roughly 5-10% of graduates start businesses. LBS run an entrepreneurship summer school which concentrates on the entrepreneurship parts of their MBA program. Over the last 9 years they've had 350 graduates, and produced 90 businesses. Of those 90, 80 are still operational.