The Forbes Cloud 100 represents a who’s who of the biggest and best private companies in the cloud, but it doesn’t tell the whole story. Right behind this year’s winners is a new crop of underdogs, breakout up-and-comers in cloud computing who are looking to follow in their footsteps—or even come for their laurels. These are the Cloud 100 Rising Stars, 20 of the fastest-growing cloud companies that are still too small or too young for the main list, but not for long.

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