Chinese electric carmaker Nio is the fastest growing of the top 500 companies in the world in terms of value, now up 23 times from last year's value to RMB 403.9 billion, the 2020 Hurun Global 500 list shows.

In terms of value gains, Xpeng ranks second, up 843 percent to a total value of RMB 248.8 billion according to the list released today.

Tesla ranked fourth in terms of value gain at 760% to a total value of RMB 3.6 trillion.

Apple is the world's most valuable company with a value of RMB 14 trillion. Microsoft and Amazon are next, both worth more than RMB 10 trillion. Alphabet is fourth, worth RMB 8 trillion.

The four trillion-dollar companies in the world added RMB 17 trillion in one year, equivalent to India's GDP, for a total value of RMB 44 trillion, or 13% of the Hurun Global 500.