Benzinga's Top #PreMarket Gainers

Rosetta Resources Inc. ROSE shares surged 36.14 percent to $26.31 in pre-market trading after the company agreed to be acquired by Noble Energy, Inc. NBL in a deal valued at $2.1 billion. Zulily Inc ZU gained 19.44 percent to $15.88 in pre-market trading following the report of a 9.2 percent stake by Alibaba. Alibaba Group Holding Ltd BABA has taken a stake of more than 9% Zulily, according to a Form 4 filing on Friday. The Wall Street Journal reported on Saturday that Alibaba was not looking to acquire Zulily, according to a source. Signature Group Holdings Inc RELY shares rose 8.50 percent to $8.30 in pre-market trading after dropping 0.26 percent on Friday Aduro BioTech Inc ADRO shares gained 6.94 percent to $32.99 in the pre-market trading session. Canaccord Genuity initiated coverage on Aduro Biotech with a Buy rating. Actavis plc ACT shares climbed 2.45 percent to $299.99 in pre-market trading after the company reported better-than-expected results for the first quarter.