Unicorns are supposed to be rare. They're also supposed to be young.
A "unicorn," in the tech patois of Silicon Valley, is a private company that has reached a $1 billion valuation. They're usually young, hot startups that has amassed hundreds of millions of dollars in funding from eager investors and breathless coverage in the press. Think Uber, Xiaomi, Snapchat, Evernote.
There are 29 unicorns left from the original 43 in 2014 — and, as Goldman Sachs analysts say, they're getting a little musty.
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