As part of our Midas List coverage this year, FORBES created a list of the top U.S. incubators and accelerators. The rankings (see the chart below) are based on a number of factors, focusing on the value of the incubators’ companies. In other words, we took the exit prices or the last priced equity valuation of the companies that have gone through each program. We also took into account other measures, such as how much venture funding their companies have raised, what percentage of their companies have raised funding and what percentage of their companies have been acquired or gone out of business. 

The top incubator in our analysis is Y Combinator. When taking into account the 172 companies that have been acquired, shut down or raised funding, the total value is $7.78 billion, for an average of $45.2 million per company. It’s a remarkable figure, considering the Mountain View, Calif.-based firm has been in existence for seven years. 

Read the full article and see the full list of top incubators at Forbes