| Relationships | Role | Relationship Start | Relationship End |
| Gs International Infrastructure Partners I, L.P. | Parent | 9/21/2008 | 12/9/2014 |
| Gs Infrastructure Carrix Cayman Holdings, L.P. | Parent | 9/21/2008 | 12/9/2014 |
| Gspx, L.P. | Subsidary | 9/21/2008 | 12/9/2014 |
| Px 3, L.P. | Subsidary | 6/13/2011 | 12/9/2014 |
| Gspx 2, L.P. | Subsidary | 12/18/2009 | 12/30/2011 |