Nostrum Oil & Gas, an oil and gas exploration and production company, agreed to acquire a 80% stake in Positive Invest, the holding company of Stepnoy Leopard Fields, for $20m. "We are pleased to announce the proposed acquisition of a majority interest in Positive Invest, whose assets are complementary to our own and which we know well. We look forward to working with the relevant stakeholders to appraise the known potential and develop additional resources which can be part of the continuing expansion of operations at our world-class gas treatment facility in Kazakhstan." Arfan Khan, Nostrum CEO.