In May 2007, following the decision to exit Interros, Prokhorov launched the private investment fund ONEXIM Group, with assets valued at US$17 billion at the time. As the separation from Interros proceeded, and as other industries caught Prokhorov's attention, the group rapidly changed its investment profile. In April 2008, Prokhorov sold his 25% plus two shares stake in Norilsk Nickel to United Company RUSAL, another mining conglomerate controlled by his fellow billionaire Oleg Deripaska, in exchange for some 14% of Rusal stock, about US$5 billion in cash, and additional payment obligations of US$2 billion. The deal has been singled out as a major success for Prokhorov as only three months later, following a dip in oil prices, a disastrous stock market crash halved the value of most Russian companies, including Norilsk. He emerged as one of the very few businessmen to have cashed out in time. However, his wealth has also been affected, as the value of his remaining interests in various companies (including Rusal and Open Investments) declined sharply, and as the remaining payment from Rusal had to be postponed but has since been fully paid.