- AERONAÚTICA CIVIL
- AGENCIA NACIONAL DE HIDROCARBUROS
- AMOCO
- AVANTE COLOMBIA
- BP EXPLORATION COMPANY
- C & C ENERGY
- CEPCOLSA S.A.
- CHEVRON
- ECOPETROL S.A.
- EMERALD ENERGY PLC
- FONADE
- HARKEN DE COLOMBIA
- LUKOIL COMPANY
- META PETROLEUM LTD.
- MINERCOL LTDA.
- NCT
- NEXEN PETROLEUM COLOMBIA LIMITED
- OCCIDENTAL DE COLOMBIA INC.
- PACIFIC RUBIALES ENERGY
- PETROSANTANDER (COLOMBIA) INC
- PETROTESTING COLOMBIA S.A.
- RANCHO HERMOSO S.A.
- REPSOL EXPLORACIÓN DE COLOMBIA S.A.
- SADEVEN S.A.
- SIPETROL S.A.
- SOLANA PETROLEUM COLOMBIA
- TALISMAN COLOMBIA OIL AND GAS LTD.
- TECNOPETROL
- TERPEL
- TPIC
- VETRA GROUP