They’re called “unicorns” — companies that have soared to a $1 billion valuation or higher. The billion-dollar tech private company was once the stuff of myth, but now they seem to be everywhere, backed by a bull market and a new generation of disruptive technology.

See CB Insights Top 10 list of private unicorn companies below, ranked by valuation. Be forewarned: The valuations of these companies are in constant flux, and this list may not necessarily reflect the most recent estimates. Some startups may be acquired by larger companies; others may file for an IPO.

Top 10 Unicorn Private Companies Valued At $1B And Above (as of Jun 2015)