STEVENSON, Md.--(BUSINESS WIRE)--The securities litigation law firm of Brower Piven, A Professional Corporation, has commenced an investigation into possible breaches of fiduciary duty and other violations of state law by the Board of Directors of MarkWest Energy Partners (“MarkWest” or the “Company”) (NYSE: MWE) relating to the proposed buyout of the Company by MPLX LP for approximately $15.8 billion. Under the terms of the transaction, MarkWest shareholders are anticipated to receive 1.09 MPL
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