Startup companies such as Uber, which was valued at $50 billion in early 2015, are assigned post-money valuations based on the price at which their most recent investor put money into the company. The price reflects what investors, for the most part venture capital firms, are willing to pay for a share of the firm. They are not listed on any stock market, nor is the valuation based on their assets or profits, but on their potential for success, growth, and eventually, possible profits.