The Company's twelve largest shareholders as of December 31, 2017:
| Name | Number of Shares | % Share |
| Enel Chile SA (1) | 4,919,488,794 | 59.98% |
| Banco de Chile on Behalf of Non-Resident Third Parties | 340,293,240 | 4.15% |
| Banco Itaú-Corpbanca on behalf of Foreign investors | 302,348,805 | 3.69% |
| Citibank N.A. per SVS Letter 1,375 | 2,879,576,480 | 3.41% |
| AFP Habitat S.A. for Pension Fund C | 201,780,870 | 2.46% |
| AFP Provida S.A. for Pension Fund C | 201,080,498 | 2.45% |
| Banco Santander on Behalf of Foreign Investors | 171,209,242 | 2.09% |
| AFP Capital S.A. for Pension Fund C | 134,427,028 | 1.64% |
| AFP Cuprum S.A. for Pension Fund C | 134,427,028 | 1.57% |
| Banchile corredores de bolsa S.A. | 85,508,422 | 1.04% |
| AFP Habitat S.A. for Pension Fund B | 82,924,205 | 1.01% |
| AFP Habitat S.A. for Pension Fund A | 71,931,340 | 0.88% |
| Subtotal | 6,919,488,206 | 84.37% |
| Otros | 1,282,266,374 | 15.63% |
| TOTAL | 8,201,754,580 | 100% |
(1) Enel Chile S.A. is controlled directly by Enel SpA., holding 60.62% of ownership.