MarkWest Energy Partners LP - 2011-10-17

The company has closed the previously announced public offering of 5,750,000 common units at a price of $45.52 per unit--an offering which totals $261.74 million. This includes 750,000 common units purchased pursuant to the full exercise of the underwriters' over-allotment option.

Morgan Stanley, BofA Merrill Lynch, Citigroup, RBC Capital Markets and Wells Fargo Securities acted as joint book-running managers for the offering.