Benzinga's Top #PreMarket Losers

Sonus Networks, Inc. SONS shares declined 33.21% to $8.79 in pre-market trading after the company lowered its outlook and announced the commencement of cost reduction review. Sonus projects Q1 adjusted loss of $0.34 to $0.29 per share on revenue of $47 million to $50 million. Whiting Petroleum Corp. WLL fell 18.60% to $31.25 in pre-market trading following the announcement of 35 million share offering. China Finance Online Co., Ltd. JRJC shares dropped 15.99% to $5.20 in pre-market on Q4 results. The company's fourth quarter revenue from financial services declined 35%. Century Aluminum Co. CENX shares fell 3.50% to $13.80 in pre-market trading. Morgan Stanley downgraded Century Aluminum from Equalweight to Underweight. Freeport-McMoRan Inc. FCX slipped 2.48% to $18.85 in pre-market trading after the company lowered its quarterly dividend from $0.3125 per share to $0.05 per share.