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•    Developers of proprietary biocatalyst Codexis Inc. (NASDAQ:CDXS) announced that its president and chief executive has resigned

•    Canada’s Fortis Inc. revealed that its plans to purchase CH Energy Group Inc. (NYSE:CHG) for $66 per share. Following this development, shares of CH Energy surged 12.68% to end the day at $66.22

•    Shares of oil exploration company Cobalt International Energy Inc. (NSYE:CIE) slid 6.05% following the company's decision to sell 47 million shares in order to fund capital expenditures

•    Share prices of silver producer Hecla Mining Co. (NYSE:HL) advanced 9.16% to close at $5.48 after the company posted record sales and profits for 2011

•    Mexican company Genomma Lab offered to buy Prestige Brands Holdings Inc. (NYSE:PBH) for $16.60 per share. Prestige Brands is a manufacturer of healthcare and housing cleaning products

•    Pharmaceutical company Corcept Therapeutics Inc. (NASDAQ:CORT) said it had received approval from the U.S. Food and Drug Administration for its treatment for high blood sugar

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