Despite opening higher, stocks edged lower Monday. Investors are cautious ahead of earnings season kicking off later this week. Hewlett-Packard (HPQ) still rallied after saying it would split into two publicly traded companies. Tesla (TSLA) drove more than 2% higher following reports the electric carmaker will introduce new features in its Model S. Samsung's plans to build a giant new chip factory took down shares of some chipmakers including Micron Technology (MU) and SanDisk (SNDK). GT Advanced Technologies (GTAT) is now worth less than a dollar. The Apple (AAPL) supplier sank more than 90% after filing for bankruptcy.