Africa-focused private investment firm Helios Investment Partners and Netherlands-based energy trader The Vitol Group have acquired a 49 percent stake in OVH Energy, the downstream business of Nigeria-based oil and gas company Oando. The transaction was structured as a US$210 million recapitalization through HV Investments II, a joint venture owned by Helios and Vitol. OVH’s assets comprise more than 350 services stations in Nigeria.