Exhibit 8.1
Subsidiaries of Ecopetrol S.A.
The following table sets forth our subsidiaries, their respective countries of incorporation, our percentage ownership in each (both directly and indirectly through other subsidiaries) as of December 31, 2025.
COMPANY | COUNTRY OF INCORPORATION | OWNERSHIP |
ALCANOS DE COLOMBIA S.A. E.S.P.** | Colombia | 29.61% |
ANDEAN CHEMICALS LIMITED | Bermuda | 100.00% |
BLACK GOLD RE LIMITED | Bermuda | 100.00% |
CENIT TRANSPORTE Y LOGÍSTICA DE HIDROCARBUROS S.A.S. | Colombia | 100.00% |
COLOMBIA PIPELINES LIMITED** | United Kingdom | 51.00% |
COMBUSTIBLES LIQUIDOS DE COLOMBIA S.A. E.S.P.** | Colombia | 41.61% |
COMPANHIA DE TRANSMISSÃO DE ENERGIA ELÉTRICA PAULISTA** | Brazil | 18.41% |
CONCESIÓN COSTERA-CARTAGENA-BARRANQUILLA S.A.S | Colombia | 51.41% |
CONSORCIO TRANSMANTARO** | Perú | 30.85% |
CÓRDOBA SOLAR 2 S.A.S. | Colombia | 100.00% |
ECONOVA TECHNOLOGY & INNOVATION, S.L. | Spain | 100.00% |
ECOPETROL AMERICA LLC** | United States | 100.00% |
ECOPETROL CAPITAL AG | Switzerland | 100.00% |
ECOPETROL COSTA AFUERA COLOMBIA S.A.S.** | Colombia | 100.00% |
ECOPETROL DEL PERU S.A.** | Perú | 100.00% |
ECOPETROL GLOBAL ENERGY S.L.U. | Spain | 100.00% |
ECOPETROL OLEO & GAS DO BRASIL LTDA** | Brazil | 100.00% |
ECOPETROL PERMIAN LLC ** | United States | 100.00% |
ECOPETROL SINGAPORE PTE. LTD | Singapore | 100.00% |
ECOPETROL TRADING ASIA PTE. LTD** | Singapore | 100.00% |
ECOPETROL US TRADING LLC** | United States | 100.00% |
ECOPETROL USA INC** | United States | 100.00% |
ECP HIDROCARBUROS DE MÉXICO** | Mexico | 100.00% |
EL ROBLE SOLAR S.A.S. | Colombia | 100.00% |
ENERFÍN SERVICIOS S.A.S. | Colombia | 100.00% |
EQUION ENERGÍA LIMITED | United Kingdom | 51.00% |
ESENTTIA MASTERBATCH LTDA** | Colombia | 100.00% |
ESENTTIA RESINAS DE MÉXICO** S. DE R.L. DE C.V. | Mexico | 100.00% |
ESENTTIA RESINAS DEL PERU SAC** | Perú | 100.00% |
ESENTTIA S.A. * | Colombia | 100.00% |
GASES DEL ORIENTE S.A. E.S.P.** | Colombia | 48.50% |
GIRASOL 1 S.A.S. | Colombia | 100.00% |
HOCOL PETROLEUM LIMITED | Bermuda | 100.00% |
HOCOL S.A.** | Cayman Islands | 100.00% |
HUB DIGITAL DE SERVICIOS ISA S.A.S.** | Colombia | 51.41% |
INTERCHILE S.A.** | Chile | 51.41% |
INTERCONEXIÓN ELÉCTRICA COLOMBIA PANAMÁ S.A. | Panamá | 25.71% |
INTERCONEXIÓN ELÉCTRICA COLOMBIA PANAMÁ S.A.S E.S.P. | Colombia | 0.60% |
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INTERCONEXIÓN ELÉCTRICA ISA BOLIVIA S.A.** | Bolivia | 51.41% |
INTERCONEXIÓN ELÉCTRICA ISA PERÚ S.A.** | Perú | 51.41% |
INTERCONEXIÓN ELECTRICA S.A E.S.P. | Colombia | 51.41% |
INTERCONEXIONES ELÉTRICAS QOYLLUR | Chile | 51.41% |
INTERCONEXIONES DEL NORTE S.A.** | Chile | 51.41% |
INTERCONEXIONES VIALES SPA** | Chile | 51.41% |
INTERLIGAÇÃO ELÉTRICA AGUAPEÍ S.A. | Brazil | 6.60% |
INTERLIGAÇÃO ELÉTRICA AIMORÉS S.A. | Brazil | 3.30% |
INTERLIGAÇÃO ELÉTRICA BIGUAÇU S.A. | Brazil | 6.60% |
INTERLIGAÇÃO ELÉTRICA DE MINAS GERAIS S.A. | Brazil | 6.60% |
INTERLIGAÇÃO ELÉTRICA DO MADEIRA S.A. | Brazil | 3.36% |
INTERLIGAÇÃO ELÉTRICA EVRECY | Brazil | 6.60% |
INTERLIGAÇÃO ELÉTRICA GARANHUNS S.A. | Brazil | 3.36% |
INTERLIGAÇÃO ELÉTRICA ITAPURA S.A. | Brazil | 6.60% |
INTERLIGAÇÃO ELÉTRICA ITAQUERÊ S.A. | Brazil | 6.60% |
INTERLIGAÇÃO ELÉTRICA ITAUNAS S.A. | Brazil | 6.60% |
INTERLIGAÇÃO ELÉTRICA IVAÍ S.A. | Brazil | 3.30% |
INTERLIGAÇÃO ELÉTRICA JAGUAR 6 S.A. | Brazil | 6.60% |
INTERLIGAÇÃO ELÉTRICA JAGUAR 8 S.A. | Brazil | 6.60% |
INTERLIGAÇÃO ELÉTRICA JAGUAR 9 S.A. | Brazil | 6.60% |
INTERLIGAÇÃO ELÉTRICA NORTE E NORDESTE S.A. | Brazil | 6.60% |
INTERLIGAÇÃO ELÉTRICA PARAGUAÇU S.A. | Brazil | 6.60% |
INTERLIGAÇÃO ELÉTRICA PINHEIROS S.A. | Brazil | 6.60% |
INTERLIGAÇÃO ELÉTRICA RIACHO GRANDE | Brazil | 6.60% |
INTERLIGAÇÃO ELÉTRICA SERRA DO JAPI S.A. | Brazil | 6.60% |
INTERLIGAÇÃO ELÉTRICA SUL S.A. | Brazil | 6.60% |
INTERLIGAÇÃO ELÉTRICA TIBAGI S.A. | Brazil | 6.60% |
INTERNEXA PERÚ S.A.** | Peru | 51.26% |
INTERNEXA S.A.** | Colombia | 51.21% |
INTERVIAL CHILE S.A.** | Chile | 51.41% |
INTERVIAL COLOMBIA S.A.S.** | Colombia | 51.41% |
INVERSIONES DE GASES DE COLOMBIA S.A. - Invercolsa S.A. | Colombia | 51.88% |
ISA CAPITAL DO BRASIL S.A.** | Brazil | 51.41% |
ISA INTERCOLOMBIA S.A. E.S.P** | Colombia | 51.41% |
ISA INVERSIONES CHILE SPA.** | Chile | 51.41% |
ISA INVERSIONES CHILE VIAS SPA. | Chile | 51.41% |
ISA INVERSIONES COSTERA CHILE SPA** | Chile | 51.41% |
ISA INVERSIONES TOLTEN LTDA.** | Chile | 51.41% |
ISA INVESTIMENTOS E PARTICIPAÇÕES DO BRASIL LTDA** | Brazil | 51.41% |
KALIXPAN SERVICIOS TÉCNICOS S. de R.L. de C.V. ** | México | 100.00% |
LA CAYENA SOLAR S.A.S. | Colombia | 100.00% |
LINEAR SYSTEMS RE LTD.** | Bermuda | 51.41% |
METROGAS DE COLOMBIA S.A. E.S.P.** | Colombia | 33.49% |
OLEODUCTO CENTRAL S.A. - OCENSA** | Colombia | 72.65% |
OLEODUCTO DE COLOMBIA S.A. - ODC ** | Colombia | 78.19% |
OLEODUCTO DE LOS LLANOS ORIENTALES S.A.** | Panamá | 65.00% |
PARQUE SOLAR PORTON DEL SOL S.A.S. E.S.P.*** | Colombia | 100.00% |
PLANTA SOLAR SAHAGÚN S.A.S. | Colombia | 100.00% |
PROMOTORA DE GASES DEL SUR S.A. E.S.P.** | Colombia | 31.44% |
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PROYECTOS DE INFRAESTRUCTURA DEL PERÚ S.A.C** | Perú | 51.41% |
RED DE ENERGÍA DEL PERÚ** | Perú | 30.85% |
REFINERIA DE CARTAGENA S.A.S * | Colombia | 100.00% |
RUTA DE LA ARAUCANÍA SOCIEDAD CONCESIONARIA S.A.** | Chile | 51.41% |
RUTA DE LOS RÍOS SOCIEDAD CONCESIONARIA S.A.** | Chile | 38.56% |
RUTA DEL BOSQUE SOCIEDAD CONCESIONARIA S.A.** | Chile | 51.41% |
RUTA DEL ESTE SOCIEDAD CONCESIONARIA S.A. | Panamá | 51.41% |
RUTA DEL LOA SOCIEDAD CONCESIONARIA S.A.** | Chile | 51.41% |
RUTA DEL MAIPO SOCIEDAD CONCESIONARIA S.A.** | Chile | 51.41% |
RUTA DEL MAULE SOCIEDAD CONCESIONARIA S.A.** | Chile | 51.41% |
RUTA ORBITAL SUR SOCIEDAD CONCESIONARIA S.A.** | Chile | 51.41% |
SANTIAGO OIL COMPANY** | Cayman Islands | 51.00% |
SISTEMAS INTELIGENTES DE RED S.A.S** | Colombia | 51.18% |
TRANSELCA S.A. E. S. P. | Colombia | 51.41% |
TRANSMISSORA ALIANÇA DE ENERGIA ELÉTRICA S.A. | Brazil | 7.65% |
WIND AUTOGENERACIÓN S.A.S. | Colombia | 100.00% |
XM COMPAÑÍA DE EXPERTOS EN MERCADOS S.A. E.S.P. | Colombia | 51.27% |
*Direct and/or indirect participation.
**Solely indirect participation through subsidiaries or affiliates.
*** The corporate name changed to “Parque Solar Portón del Sol S.A.S.” on February 3, 2026.
Note on Exhibit 8.1: The number of entities provided in this Exhibit 8.1 is different from the disclosed in Section 3.2 of this Annual Report. This difference is due to the application of the Colombian concept of 'joint control' (control conjunto) established under Colombian legal doctrine (notably by the Superintendency of Industry and Commerce). Under Colombian jurisdiction, joint control is recognized when two or more parties exercise equal influence over an entity, so is imperative the consensus for corporate actions. This regulatory framework could differ from the 'affiliate' concept under U.S. standards. That’s why the companies INTERCONEXIÓN ELÉCTRICA COLOMBIA PANAMÁ S.A., INTERCONEXIÓN ELÉCTRICA COLOMBIA PANAMÁ S.A.S. E.S.P., INTERLIGAÇÃO ELÉTRICA AIMORÉS S.A., INTERLIGAÇÃO ELÉTRICA DO MADEIRA S.A., INTERLIGAÇÃO ELÉTRICA GARANHUNS S.A., INTERLIGAÇÃO ELÉTRICA IVAÍ S.A., INTERLIGAÇÃO ELÉTRICA PARAGUAÇU S.A., TRANSMISSORA ALIANÇA DE ENERGIA ELÉTRICA S.A., are not included in the total shown in Section 3.2 and here in the exhibit; however, based on accounting principles, they are included.
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