October 9 (SeeNews) - The blue-chip index of the Belgrade Stock Exchange, the BELEX15, rose slightly on Wednesday, driven up by gains in civil engineering company Energoprojekt Holding [BEL:ENHL], household appliances maker Metalac [BEL:MTLC], oil and gas company NIS [BEL:NIIS], and Aerodrom Nikola Tesla [BEL:AERO], bourse data showed.