Name |
| Jurisdiction of Formation |
MarkWest Energy GP, L.L.C. |
| Delaware |
MarkWest Energy Partners, L.P. |
| Delaware |
Basin Pipeline L.L.C. |
| Michigan |
Bright Star Gathering, Inc. |
| Texas |
MarkWest Blackhawk, L.P. |
| Texas |
MarkWest Energy Appalachia, L.L.C. |
| Delaware |
MarkWest Energy East Texas Gas Company, L.P. |
| Delaware |
MarkWest Energy Finance Corporation |
| Delaware |
MarkWest Energy Operating Company, L.L.C. |
| Delaware |
MarkWest Javelina Company |
| Texas |
MarkWest Javelina Holding Company, L.P. |
| Delaware |
MarkWest Javelina Pipeline Company |
| Texas |
MarkWest Javelina Pipeline Holding, L.P. |
| Oklahoma |
MarkWest Michigan Pipeline Company, L.L.C. |
| Michigan |
MarkWest New Mexico, L.P. |
| Texas |
MarkWest Pinnacle L.P. |
| Texas |
MarkWest Pipeline Company, L.P. |
| Texas |
MarkWest PNG Utility, L.P. |
| Texas |
MarkWest Power Tex L.P. |
| Texas |
MarkWest Texas GP, L.L.C. |
| Delaware |
MW Texas Limited, L.L.C. |
| Delaware |
MarkWest Texas PNG Utility, L.P. |
| Texas |
MarkWest Western Oklahoma Gas Company, L.L.C. |
| Oklahoma |
Matrex, L.L.C. |
| Michigan |
Starfish Pipeline Company, L.L.C. |
| Delaware |
Stingray Pipeline Company, L.L.C. |
| Delaware |
Triton Gathering, L.L.C. |
| Delaware |
West Cameron Dehydration Company, L.L.C. |
| Delaware |
West Shore Processing Company, L.L.C. |
| Michigan |
