Company:  MARKWEST ENERGY PARTNERS ... (MWE)
Form Type:  8-K
Filing Date:  5/23/2012 
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: 
$67.85   		Change: 
0.16 (0.24%)  
Trade Time: 
04:05 PM EST   		Market Cap: 
$8.85B
Description of Business
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  FORM 8-K
    SECTION 7 REGULATION FD
      ITEM 7.01. Regulation FD
    SECTION 9 FINANCIAL STATEMENTS AND EXHIBITS
      ITEM 9.01. Financial Statements and Exhibits.
    SIGNATURE
  EXHIBIT 99.1
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