Infoblox (NYSE:

) shares fell 32.55% to $13.84 in pre-market trading after the company reported that its CEO Robert Thomas is stepping down. The company also issued a downbeat forecast for the fiscal fourth quarter. Analysts at Deutsche Bank downgraded Infoblox from Buy to Hold and lowered the target price from $30 to $18. Annie's (NYSE:

) dipped 14.08% to $29.97 in pre-market trading on Q1 results after the company posted disappointing Q4 earnings and issued a weak outlook for the current fiscal year. Express (NYSE:

) shares dropped 12.84% to $11.88 in pre-market trading after the company reported weaker-than-expected first-quarter earnings and lowered its full-year earnings guidance. Splunk (NASDAQ:

) dropped 9.19% to $45.44 in pre-market trading after the company posted a Q1 net loss of $50.8 million, or $0.43 per share, versus a year-earlier loss of $16.1 million, or $0.16 per share. Glu Mobile (NASDAQ:

) shares declined 6.40% to $3.80 in pre-market trading after the company announced a proposed public offering of common stock.