Andrew Ross Sorkin:

If you add up all the money Uber has raised since it started in 2009 — the idea was born when its founders became annoyed that they could not get a cab in Paris — the ride-hailing app company is on its way to amassing a colossal $15 billion. That’s real cash, not some funny-money, paper-based valuation. (That figure is $68 billion.) It has done all this while still managing to remain a private company, and its chief executive, Travis Kalanick, has insisted that a public offering is not coming soon. “I’m going to make sure it happens as late as possible,” he has repeatedly said.
 
 Consider this: When Amazon went public in 1997, it raised $54 million and was valued at $438 million.