Earnings due out after the bell...

Companies due to report today:

Polypore (PPO)
Qualcomm (QCOM)
Concho Resources (CXO)
Vulcan Materials (VMC)
Whole Foods (WFM)
Kraft Foods (KFT)
Comscore (SCOR)
Walter Energy (WLT)
Mercado Libre (MELI)
Dendreon (DNDN)
Nutrisystem (NTRI)