These 9 startups you've never heard of could be worth $1 billion very soon

With more than 100 startups valued at $1 billion or more, the term "unicorn" — given to startups worth more than $1 billion — has lost some of its aura. But a $1 billion valuation is still a huge milestone for any startup. Pitchbook, a private-equity and venture-capital research firm, analyzed …