X0202 4 2007-01-31 0 0001166036 MARKWEST ENERGY PARTNERS L P MWE 0001279731 SCHROEDER ANDREW L C/O MARKWEST ENERGY PARTNERS, L.P. 1515 ARAPAHOE ST. TWR 2, STE 700 DENVER CO 80202 0 1 0 0 VP Finance & Treasurer Common Units 2007-01-31 4 A 0 894 0 A 3570 D Common Units 2007-01-31 4 M 0 250 0 A 3820 D Common Units 2007-01-31 4 M 0 57 0 A 3877 D Phantom Units 2007-01-31 4 M 0 250 0 D 2014-09-16 Common Units 250 250 D Phantom Units 2007-01-31 4 M 0 57 0 D 2015-01-31 Common Units 57 57 D Represents a phantom unit, which is a restricted unit that entitles the reporting person to receive a common unit upon the vesting of the phantom unit. Under the grant agreement, the settlement of the phantom units occurs automatically as the phantom units vest, which results in a deemed automatic expiration of the vested portion of the phantom units upon settlement. The phantom units vest over a period of three years with one third vesting on January 31 2008, 2009 and 2010. Amount of securities beneficially owned following the reported transaction(s) includes Common Units owned and Restricted Units subject to varying vesting terms. 1 for 1. Under the phantom unit grant agreement, the settlement of the phantom units occurs automatically as the phantom units vest, which results in a deemed automatic expiration of the vested portion of the phantom units upon settlement. The phantom units vest over a period of three years with one third vesting on January 31 of each anniversary year. /s/ Sean M. McKendry as POA for Andrew L. Schroeder 2007-02-02