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These 15 startups didn't exist 5 years ago - now they're worth billions

Maya KosoffDec 10, 2015, 22:31 IST

Michael Kovac/Getty Images

Every week this year, another startup has reached a billion-dollar valuation. (Whether these private market valuations actually hold water is another question.)

We've decided to rack up a bunch of these billion-dollar startups - Cowboy Ventures' Aileen Lee first referred to them as "unicorns" - that didn't exist five years ago, and that are now valued at $1 billion or more.

For the purposes of this list, we zeroed in on US-based companies that were founded in 2011 or later (since we're nearing the very end of 2015), and that are private tech companies.

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We then ranked them from least to most valuable.