The 5 principles of lean startup are: 1. Entrepreneurs are everywhere 2. Entrepreneurship is management 3. Validated learning 4. Build-measure-learn 5. Innovate around the core These principles are based on the lean startup methodology, which is a way of thinking about and approaching startup companies. The lean startup methodology is based on the principle that startups are not small versions of large companies, but are instead unique entities that require their own management and development approach.