Henadiy Boholyubov

With fellow Ukrainian billionaire Ihor Kolomoyskyy, Henadiy Boholyubov founded PrivatBank with $1 million in capital in the early 1990s.

Over the years it grew to be a key bank in Ukraine, handling more than a third of private deposits and serving about half the country's population.

In 2016, Ukraine's government nationalized the bank; an investigation indicated large-scale fraud over a period of ten years.

In December 2017, the U.K. froze more than $2.5 billion in assets belonging to Kolomoyskyy and Boholyubov. They denied wrongdoing.

Boholyubov now draws much of his fortune from the Privat Group, a conglomerate that owns interests in petrol stations and oil and gas, among other investments.