Benzinga's Top #PreMarket Gainers

Chubb Corp CB shares climbed 33.53 percent to $127.00 in pre-market trading after ACE Limited announced its plans to buy Chubb for $28.3 billion. AlarmCom Hldg Inc ALRM gained 10.92 percent to $17.06 in pre-market trading after falling 2.47 percent on Tuesday. ACE Limited ACE shares rose 9.68 percent to $111.52 in pre-market trading after the company agreed to buy Chubb for $28.3 billion. Travelers Companies Inc TRV shares rose 4.70 percent to $101.20 in pre-market trading after gaining 0.43 percent on Tuesday. Alder Biopharmaceuticals Inc ALDR shares climbed 3.93 percent to $55.05 in pre-market trading after the company reported that the underwriters of its earlier announced public offering of common stock have exercised in full their option to purchase an additional shares.