| Subsidiary | State of Incorporation | ||||||||||
| 1 | Bluestone Gas Corporation of New York, Inc. | New York | |||||||||
| 2 | Bluestone Pipeline Company of Pennsylvania, LLC | Pennsylvania | |||||||||
| 3 | DTM Appalachia Gathering, LLC | Delaware | |||||||||
| 4 | DTM LEAP Gas Gathering, LLC | Delaware | |||||||||
| 5 | DTM Louisiana Gathering, LLC | Delaware | |||||||||
| 6 | DTM Millennium Company | Michigan | |||||||||
| 7 | DTM Nexus, LLC | Delaware | |||||||||
| 8 | DTM Vector Company | Michigan | |||||||||
| 9 | Stonewall Gas Gathering LLC | Delaware | |||||||||
| 10 | Stonewall Gas Holdings, LLC | Delaware | |||||||||
| 11 | Susquehanna Gathering Company I, LLC | Pennsylvania | |||||||||