Mikhail Prokhorov

Mikhail Prokhorov sold a 49% stake in the Brooklyn Nets to Alibaba executive Joseph Tsai in a $2.3 billion deal in 2018.

Much of Prokhorov's fortune stems from the 2008 sale of his stake in metals giant Norilsk Nickel.

He has stakes in Russian power, insurance and banking sectors.

He ran against Vladimir Putin in Russia's 2012 presidential race, gaining 8% of the vote.

He sold his last block of shares in UC Rusal one month before sanctions were imposed against the company by the US Treasury.