Seplat Petroleum Development Company Plc (Seplat) is a Nigeria-based company engaged in oil and gas exploration and production. The Company's portfolio comprises six blocks in the Niger Delta, five of which Seplat operates, including OML 4, OML 38, OML 41, OPL 283, OML 53 and OML 55. The Company has a 45% working interest in OMLs 4, 38 and 41 which are located in Edo and Delta States onshore Nigeria. The Company has a 40% non-operated working interest in OPL 283 Marginal Field Area (Pillar). The Company has a 40% working interest in OML 53, which is located onshore in Imo State in the north eastern Niger Delta, approximately 60km north of Port Harcourt. The Company has a 22.5% working interest in OML 55 which is located in the swamp to shallow water offshore areas in the south eastern Niger Delta in Nigeria.