Morning Market Losers

Eco-Stim Energy Solutions Inc ESES shares dipped 26.40 percent to $4.60 after the company priced its 5.5 million share offering at $4.75 per share. Barracuda Networks Inc CUDA dropped 19.50 percent to $31.49. Barracuda Networks reported better-than-expected fiscal first-quarter earnings. Zillow Group Inc Z shares slipped 6.98 percent to $79.31 after the company announced the resignation of its CFO Chad Cohen, effective Aug. 7, 2015. Aquinox Pharmaceuticals Inc AQXP shares tumbled 5.82 percent to $2.01. Jefferies downgraded Aquinox Pharmaceuticals from Buy to Hold and lowered the price target from $13.00 to $2.00. Biogen Inc BIIB shares slipped 3.14 percent to $386.75. Atara Biotherapeutics Inc ATRA shares declined 2.21 percent to $52.23 after the company priced its 3.46 million share offering at $52.00 per share.