| Azionista | Capitale | Azioni |
|---|---|---|
| City of Rome (Italy) | 51,00% | 108.611.150 |
| Veolia Environnement SA | 23,30% | 49.691.095 |
| Francesco Gaetano Caltagirone | 5,90% | 12.560.000 |
| Caltagirone SpA | 1,55% | 3.300.000 |
| Amundi Asset Management SA (Investment Management) | 0,61% | 1.289.214 |
| The Vanguard Group, Inc. | 0,56% | 1.191.424 |
