10 unicorn tech startups had major exits last quarter - and the biggest was worth $53 billion

When the e-signature and transaction company DocuSign went public in April, it was valued around $4.5 billion, far above its last funding round, which valued it at $3 billion.

When the Czech cybersecurity company Avast Software went public in May, it was valued at around £2.4 billion, or $3.08 billion. Its last funding round valued the company at $1 billion.

When the Utah-based online education company Pluralsight went public in May, it was valued around $2 billion. That's double its last valuation of $1 billion.

GreenSky, an Atlanta, Georgia-based financial tech company, went public in May, with a valuation around $4.4 billion. That was just below its last valuation of $4.5 billion.

GitHub, a social networking site for coders, got acquired by Microsoft in June for $7.5 billion. It was last valued at $2 billion.

The Netherlands-based global payments company Adyen went public in June, with a valuation of $8.3 billion — far past its last valuation of $2.3 billion.

AppNexus was acquired by AT&T in June for a reported $1.6 billion — slightly below its last funding round, which valued the company at $1.8 billion.

The Beijing, China-based electronics company Xiaomi went public in June at the highest valuation of the quarter, $53 billion. Its last funding round valued the company at $46 billion.

The Chinese U51.com, also known as 51 Credit Card Company, went public on the Hong Kong markets in June, at a valuation around $1.4 billion. The credit card technology company was last valued at $1 billion.