o Shares of Amylin Pharmaceuticals, Inc. (NASDAQ:AMLN) gained 54.45% after Bloomberg reported that the diabetes drug maker had rejected a $3.5 billion takeover bid from Bristol-Myers Squibb Co. (NYSE:BMY)

o Shares of Annie’s Inc. (NYSE:BNNY) gained 89.05% after the food maker launched its IPO on the New York Stock Exchange

o Red Hat Inc. (NYSE:RHT) reported fourth-quarter 2012 earnings per share of $0.19, missing the Zacks Consensus Estimate by a penny

o Peabody Energy Corporation’s (NYSE:BTU) shares declined 3.42% following a government announcement proposing stricter emission regulations for its coal-fired power plants

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