Company:  MARKWEST ENERGY PARTNERS ... (MWE)
Form Type:  10-Q
Filing Date:  5/7/2012 
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: 
$69.40   		Change: 
0.34 (0.49%)  
Trade Time: 
May 22   		Market Cap: 
$9.05B
Description of Business
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  FORM 10-Q
    PART I-FINANCIAL INFORMATION
      Item 1. Financial Statements
        BALANCE SHEET
        INCOME STATEMENT
        CASH FLOW
        Notes to the Condensed Consolidated Financial Statements
          BALANCE SHEET
          BALANCE SHEET
          BALANCE SHEET
      Item 2. Management's Discussion and Analysis of Financial ...
      Item 3. Quantitative and Qualitative Disclosures about ...
      Item 4. Controls and Procedures
    PART II-OTHER INFORMATION
      Item 1. Legal Proceedings
      Item 1A. Risk Factors
      Item 6. Exhibits
    SIGNATURES
  EXHIBIT 4.1
  EXHIBIT 31.1
    CERTIFICATION
  EXHIBIT 31.2
    CERTIFICATION
  EXHIBIT 32.1
    CERTIFICATION PURSUANT TO
  EXHIBIT 32.2
    CERTIFICATION PURSUANT TO
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