MarkWest Energy Partners, L.P.

Ticker — MWE (NYSE)   
66.3 million units outstanding

Key assets:
Southwest Business Unit
East Texas: Gathering system and processing plant.
Western Oklahoma: Gas gathering system and processing plant.
Southeast Oklahoma: Gas gathering system and processing plant.
Other Southwest: Twelve gas gathering systems and 4 lateral gas pipelines.

Northeast Business Unit
Appalachia: Franchise processing position in the prolific Appalachian basin.
Michigan: Largest intrastate crude oil pipeline in Michigan.

Liberty Business Unit
Liberty: Joint-venture with NGP Midstream and Resources to develop midstream infrastructure in the Marcellus shale.

Gulf Coast Business Unit
Javelina: Refinery off-gas processing, fractionation and transportation facilities.