The company’s shareholder capital is divided into 57,452,641,516 shares, with no face value, all belonging to the same series.
As of December 31, 2017, all shares were subscribed and paid, and they were owned in accordance with the following breakdown:
| Shareholders | Shares | Percentage |
| Enel S.p.A | 29.762.213.531 | 51,80% |
| ADR'S (Citibank N.A. according to circular 1.375 of the SVS) | 5.064.445.978 | 8,81% |
| Chilean Pension Funds | 8.606.567.373 | 14,98% |
| Foreign investment funds | 90.124.898 | 0,16% |
| Custodian Banks | 8.605.676.521 | 14,98% |
| Brokers, Insurance Companies and Mutual Funds | 3.795.006.987 | 6,61% |
| Other Shareholders | 1.528.606.987 | 2,66% |
| Total shares | 57.452.641.516 | 100,00% |