They were 39 in 2013. Nowadays, private companies valued at over $1 billion — so-called "unicorn" companies — number more than 1,100 worldwide, with a whopping cumulative valuation of $3.8 trillion.
In Greater Boston, there's no shortage of tech and biotech companies hitting that milestone. In the past six months, a handful of mostly software firm joined the unicorn herd with valuations between $1 billion and $2 billion.
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