The 13 richest enterprise startups

Enterprise cloud startups continue to be a major area of investment for the venture capital world, as so-called "unicorn" startups valued at $1 billion or more continue to raise money at record rates - usually before they've ever posted a profit.

Just how big are their piles of money? Really, really big, with companies like Cloudera and Dropbox breaking the $1 billion mark in investment funding alone, according to a report compiled by Forbes, using data provided by VC-tracking startup Mattermark.

From Cloudera to Zuora, here are the 13 cloud startups sitting on the most investor cash.