Five Decacorns with a combined valuation of nearly $200 billion may remain private for a good portion of 2017.

Billion-dollar start-ups that define the sharing economy are challenging well-established firms. These pioneers have grown quickly because of their ability to anticipate and address the demands of consumers and businesses.

“Unicorn” has come to be used to describe technology start-ups worth at least $1 billion. But now some private companies are worth more than $10 billion, which has led to the invention of a new term: “decacorn.”

The top five decacorns are worth a combined $192.5 billion.

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