Icahn joins a long list of backers for the three-year old startup, including Andreessen Horowitz, New York-based technology hedge-fund Coatue Management, Chinese e-commerce giant Alibaba (BABA.N), and hedge fund Third Point Management. Lyft, known for cars displaying a pink moustache logo, uses a smartphone app to match riders with paid drivers who use their own cars rather than livery vehicles, a service similar to one offered by Uber Technologies Inc.