2015 was a big year for private market tech companies and their valuations.
Uber, already the most valuable private tech company in the world, is rumored to be raising a new round of funding that would value the company around $60 billion.
And this year alone, 70 startups became members of the "unicorn club," meaning new rounds of funding valued these companies at $1 billion or higher.
42 of those companies are US based, according to research analytics firm CB Insights. We've rounded those companies up and ranked them from least to most valuable.
SEE ALSO: The 25 hottest startups that launched in 2015
42. Datto
Valuation: $1 billion
Founded: 2007
What it does: Datto helps small and medium-sized businesses get back to work after natural disasters that could eradicate their computers, offices, and servers.
41. Kabbage
Valuation: $1 billion
Founded: 2009
What it does: Kabbage is a fintech startup that lends money to smaller merchants on eBay, Amazon, and Etsy.
40. AppDirect
Valuation: $1 billion
Founded: 2009
What it does: AppDirect is a sort of middleman for the cloud. Its business is rooted in acting as kind of an App Store for the enterprise software buyer.
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