Benzinga's Top #PreMarket Losers

Eco-Stim Energy Solutions Inc ESES shares tumbled 27.58 percent to $4.49 in pre-market trading after the company priced its 5.5 million share offering at $4.75 per share. Barracuda Networks Inc CUDA fell 14.57 percent to $33.42 in pre-market trading. Barracuda Networks reported better-than-expected fiscal first-quarter earnings. Zillow Group Inc Z shares declined 3.24 percent to $82.50 in pre-market trading after the company announced the resignation of its CFO Chad Cohen, effective Aug. 7, 2015. China Finance Online Co. (ADR) JRJC shares dropped 2.74 percent to $4.62 in pre-market after gaining 9.95 percent on Thursday. Atara Biotherapeutics Inc ATRA shares fell 0.84 percent to $53.01 in pre-market trading after the company priced its 3.46 million share offering at $52.00 per share.