Academic entrepreneurship has recently attracted much attention. This paper studies three different groups of start-ups linked to Stanford University. The first one is the group of start-ups which obtained a license from the Office of Technology Licensing (OTL) of Stanford University (called the “spin-offs”). The second one is based on a study commissioned by OTL in 1991. The third group known as “Wellspring of Innovation” is a list of companies founded by Stanford Alumni. This makes a total of more than 2’700 start-ups.