U.S. stocks fell Monday as investors digested a number of corporate earnings reports and oil prices decreased more than 1.5%. Deutsche Bank (DB - Get Report) shares rose 0.4% after media reports suggested the company may scale back its U.S. operations. The bank currently faces a $14 billion settlement with the U.S. Justice Department over toxic mortgage-related securities it sold in the years leading up to the financial crisis. Caterpillar (CAT - Get Report) CEO Doug Oberhelman announced plans to retire in March. He will be replaced by Jim Umpleby, the company's group president for energy and transformation. Caterpillar shares fell 0.3%. Groupon (GRPN - Get Report) shares gained 4% after Wedbush Securities upgraded the stock to OUTPERFORM from NEUTRAL. The analysts expect third-quarter earnings to eclipse Wall Street's estimates. TheStreet's Scott Gamm reports from Wall Street.