Equity Research for the following companies: Amylin Pharmaceuticals (NASDAQ:AMLN), Express Scripts (NASDAQ:ESRX), Citigroup (NYSE:C), EMC (NYSE:EMC), Dollar General (NYSE:DG), and Petroleo Brasileiro SA (NYSE:PBR).

Wall Street's recovery from last month's plunge gained momentum Monday, with stocks rising as investors looked past widening cracks in the subprime lending sector and bought in response to another parade of acquisition deals.