| Name | Type | Sector | Country | Joined On |
|---|---|---|---|---|
| ECOPETROL S.A | Company | Oil, gas, & coal | Colombia | 13-May-2009 |
| Transportadora De Gas Internacional S.A. E.S.P | Company | Oil, gas, & coal | Colombia | 27-Nov-2008 |
| GIM INGENIERIA ELECTRICA | Small or Medium-sized Enterprise | Oil, gas, & coal | Colombia | 08-May-2008 |
| Vanti Gas Natural | Company | Oil, gas, & coal | Colombia | 11-Feb-2005 |