9. Uber is valued at a nice $3.8 billion.

On-demand car app Uber raised an enormous $258 million round in August, bringing its valuation to $3.8 billion. Sometimes, Uber generates $20 million per week.

To date, Uber has raised $405 million from investors like Benchmark Capital, Bezos Expeditions, First Round Capital, Founder Collective, Goldman Sachs, Google Ventures, Jumpstart Capital, Lowercase Capital, Menlo Ventures, and TPG Growth.