Pre-Market Losers 8/4

Dendreon DNDN -63.81% on multiple analyst downgrades this morning Entropic Communications ENTR -24.4% on lower earnings and several analyst downgrades this morning. Zumiez ZUMZ -13.28% on lower than expected same store sales increase. Walter Energy WLT -12.2% on disappointing Q2 earnings. Aeropostale ARO -12.83% on disappointing retail sales data and lower guidance.