X0203 0001143313 AMERICAN STOCK EXCHANGE LLC 0001019756 MARKWEST HYDROCARBON INC 001-14841

1515 ARAPAHOE STREET, TOWER 2, SUITE 700 Denver CO COLORADO 80202-2126

303-925-9200 Common Stock, Par Value $.01 17 CFR 240.12d2-2(a)(3) Kerri L. Ramirez Manager, Corporate Actions and Proxy Rulings 2008-02-27