Company:  MARKWEST ENERGY PARTNERS ... (MWE)
Form Type:  4
Filing Date:  3/23/2012 
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: 
$66.54  
Change: 
-1.31 (-1.93%)  
Trade Time: 
04:05 PM EST  
Market Cap: 
$8.67B
Description of Business
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  FORM 4
    NAME AND TITLE
    NON DERIVATIVE SECURITIES
    DERIVATIVE SECURITIES
    EXPLANATIONS AND REMARKS
    REPORTING OWNERS
    SIGNATURES