Company:  MARKWEST ENERGY PARTNERS ... (MWE)
Form Type:  424B2
Filing Date:  5/8/2012 
CIK:  0001166036 
Address:  1515 ARAPAHOE STREET
TOWER 1, SUITE 1600 
City, State, Zip:  DENVER, Colorado 80202 
Telephone:  303-925-9200 
Fiscal Year:  12/31 
Last Trade
Last Trade: 
$67.40   		Change: 
1.29 (1.95%)  
Trade Time: 
May 17   		Market Cap: 
$8.79B
Description of Business
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  FORM 424B2
    Subject to Completion, dated May 8, 2012
    TABLE OF CONTENTS
    SUMMARY
    The Offering
    RISK FACTORS
    USE OF PROCEEDS
    CAPITALIZATION
    U.S. FEDERAL INCOME TAX CONSIDERATIONS
    UNDERWRITERS (CONFLICTS OF INTEREST)
    EXPERTS
    FORWARD-LOOKING STATEMENTS
    WHERE YOU CAN FIND MORE INFORMATION
      INCOME STATEMENT
    RISK FACTORS
    USE OF PROCEEDS
    RATIOS OF EARNINGS TO FIXED CHARGES
    DESCRIPTION OF COMMON UNITS
    Transfer Agent and Registrar
    DESCRIPTION OF OUR DEBT SECURITIES
    Power of Attorney
    Change of Management Provisions
      Indemnification
    PLAN OF DISTRIBUTION
    LEGAL MATTERS
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