X0201 4 2003-12-01 0 0001166036 MARKWEST ENERGY PARTNERS L P MWE 0001237512 KELLSTROM WILLIAM A C/O MARKWEST ENERGY PARTNERS, L.P. 155 INVERNESS DRIVE WEST, STE 200 ENGLEWOOD CO 80112 1 0 0 0 Common Units 2003-12-01 4 M 0 750 0 A 2750 D Phantom Units 2003-12-01 4 M 0 750 0 D Common Units 750 750 D 1 for 1 Previously inadvertently incorrectly reported as "restricted units". 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 generally over a period of our years, with 25% vesting at the end of the second and third years after the date of grant, and 50% vesting at the end of the fourth year after the date of grant. The vesting may be accelerated in certain instances if the issuer achieves certain unitholder distribution targets. Lucy Woods POA for William Kellstrom 2003-12-03