X0101 EFFECT 33 LIVE 2012-11-02 12:00:00

S-3

0001166036 MARKWEST ENERGY PARTNERS L P 333-184482 0001315263 MarkWest Energy Finance CORP 333-184482-28 0001292406 MarkWest Energy Operating CO LLC 333-184482-27 0001292408 West Shore Processing CO LLC 333-184482-26 0001292409 MarkWest Energy Appalachia LLC 333-184482-25 0001435921 Mason Pipeline LTD Liability CO 333-184482-24 0001292411 MarkWest Michigan Pipeline CO LLC 333-184482-23 0001292413 MarkWest Oklahoma Gas CO LLC 333-184482-22 0001292419 MarkWest New Mexico LLC 333-184482-21 0001292415 MarkWest Pinnacle LLC 333-184482-20 0001292416 MarkWest PNG Utility LLC 333-184482-19 0001292417 MarkWest Texas PNG Utility LLC 333-184482-18 0001292418 MarkWest Blackhawk LLC 333-184482-17 0001292414 MarkWest Power Tex LLC 333-184482-16 0001315242 MarkWest Pipeline CO LLC 333-184482-15 0001315262 MarkWest Energy East Texas Gas CO LLC 333-184482-14 0001349175 MarkWest Javelina CO LLC 333-184482-13 0001349174 Markwest Javelina Pipeline CO LLC 333-184482-12 0001435926 Matrex, L.L.C. 333-184482-11 0001435924 MarkWest Liberty Gas Gathering, L.L.C. 333-184482-10 0001457473 MarkWest Gas Marketing, L.L.C. 333-184482-09 0001457474 MarkWest McAlester, L.L.C. 333-184482-08 0001512400 MarkWest Ranger Pipeline Company, L.L.C. 333-184482-07 0001533090 MarkWest Mountaineer Pipeline Company, L.L.C. 333-184482-06 0001555528 MarkWest Utica Operating Company, L.L.C. 333-184482-05 0001435923 MarkWest Gas Services, L.L.C. 333-184482-04 0001412304 MarkWest Energy GP, L.L.C. 333-184482-03 0001019756 MARKWEST HYDROCARBON INC 333-184482-02 0001435922 MarkWest Marketing, L.L.C. 333-184482-01