| COMPANY                                                 |   | COUNTRY OFINCORPORATION |   | OWNERSHIP % |   |   | VOTING % |   |
|---------------------------------------------------------|--------|------------------------------|--------|------------------|--------|--------|---------------|--------|
| Andean Chemicals Ltd.                                   |   | Bermuda                      |   |             | 100    |   |          |   | 100 |   |
| Bioenergy S.A.**                                        |   | Colombia                     |   |             | 88.6   |   |          |   | 88.6 |   |
| Bioenergy Zona Franca S.A.S.**                          |   | Colombia                     |   |             | 88.6   |   |          |   | 88.6 |   |
| Black Gold Re                                           |   | Bermuda                      |   |             | 100    |   |          |   | 100 |   |
| Colombia Pipelines Limited**                            |   | United Kingdom               |   |             | 51     |   |          |   | 51 |   |
| COMAI - Compounding and Masterbatching Industry Ltda.** |   | Colombia                     |   |             | 100    |   |          |   | 100 |   |
| Ecopetrol America Inc.*                                 |   | United States                |   |             | 100    |   |          |   | 100 |   |
| Ecopetrol Capital AG                                    |   | Switzerland                  |   |             | 100    |   |          |   | 100 |   |
| Ecopetrol del Perú S.A.*                           |   | Perú                    |   |             | 100    |   |          |   | 100 |   |
| Ecopetrol Global Capital S.L.U.                         |   | Spain                        |   |             | 100    |   |          |   | 100 |   |
| Ecopetrol Global Energy S.L.U.                          |   | Spain                        |   |             | 100    |   |          |   | 100 |   |
| Ecopetrol Oleo e Gas do Brasil Ltda*                    |   | Brazil                       |   |             | 100    |   |          |   | 100 |   |
| Ecopetrol Pipelines International Ltd.**                |   | Bermuda                      |   |             | 100    |   |          |   | 100 |   |
| Ecopetrol Transportation Company Limited                |   | Cayman Islands               |   |             | 100    |   |          |   | 100 |   |
| Ecopetrol Transportation Investments Ltd.*              |   | Bermuda                      |   |             | 100    |   |          |   | 100 |   |
| Equion Energy Ltda                                      |   | United Kingdom               |   |             | 51     |   |          |   | 51 |   |
| Hocol Petroleum Limited**                               |   | Bermuda                      |   |             | 100    |   |          |   | 100 |   |
| Hocol S.A.**                                            |   | Cayman Islands               |   |             | 100    |   |          |   | 100 |   |
| Homcol Cayman Inc.**                                    |   | Cayman Islands               |   |             | 100    |   |          |   | 100 |   |
| ODL Finance S.A.                                        |   | Panama                       |   |             | 65     |   |          |   | 65 |   |
| Offshore International Group Inc. – OIG(1)        |   | United States                |   |             | 50     |   |          |   | 50 |   |
| Oleoducto Bicentenario de Colombia S.A.S.*              |   | Colombia                     |   |             | 55.97  |   |          |   | 55.97 |   |
| Oleoducto Central S.A.*                                 |   | Colombia                     |   |             | 72,6   |   |          |   | 72,6 |   |
| Oleoducto de Colombia S.A.*                             |   | Colombia                     |   |             | 73     |   |          |   | 73 |   |
| Oleoducto de los Llanos Orientales S.A. **              |   | Panama                       |   |             | 65     |   |          |   | 65 |   |
| Propilco S.A.*                                          |   | Colombia                     |   |             | 100    |   |          |   | 100 |   |
| Refinería de Cartagena S.A.*                       |   | Colombia                     |   |             | 100    |   |          |   | 100 |   |
| Santiago Oil Co. **                                     |   | Cayman Islands               |   |             | 51     |   |          |   | 51 |   |
| Santiago Pipelines Co.**                                |   | Cayman Islands               |   |             | 51     |   |          |   | 51 |   |
| Savia Perú S.A.**(1)                               |   | Peru                         |   |             | 50     |   |          |   | 50 |   |

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