According to Thomson Financial, Igor Kolomoyskiy acquired a 12.62% stake in JKX Oil & Gas (JKX LN: N/R), a British oil and gas production company that has 80% of its assets in Ukraine. The volume of the deal was not disclosed. Kolomoyskiy picked up the stake through Ralkon Commercial, a company in which he holds 100% of the equity. Kolomoyskiy is a key shareholder of the Privat Group, which controls about 20% of the world’s ferroalloy production; Privat Bank, Ukraine’s #1 bank by assets; and 42% of Ukrnafta (UNAF: U/R).