what is the top reason entrepreneurs provided when asked why their startup failed?

The top reason entrepreneurs provide when asked why their startup failed is "building a solution looking for a problem," meaning they did not target a real market need. This reason is ranked number one by CB Insights in their analysis of startup failure post-mortems from founders. Other top reasons include running out of cash and not having the right team, but failing to address a real market need is the primary cause cited by entrepreneurs themselves.