JKX Oil & Gas is a British-based hydrocarbon exploration and production company, since 1995 listed on the London Stock Exchange. The Company is engaged in the exploration, evaluation, development and production of oil and gas reserves. JKX operates primarily in south Russia and Ukraine, but has a presence in 6 other countries in Europe and North America. The company's largest stockholders is an Ukrainian-Cypriot-Israeli multibillionaire Igor Kolomoisky and Hennadiy Boholiubov with a 27.5% stake in JKX.