The Oil Refiners ETF is seeing unusually high volume in afternoon trading Thursday, with over 60,000 shares traded versus three month average volume of about 26,000. Shares of CRAK were up about 1.8% on the day.

Components of that ETF with the highest volume on Thursday were Marathon Petroleum, trading up about 4.2% with over 4.5 million shares changing hands so far this session, and Valero Energy, up about 4.9% on volume of over 2.7 million shares. PBF Energy is the component faring the best Thursday, higher by about 5.2% on the day, while Sinopec Shangai Petrochemical is lagging other components of the Oil Refiners ETF, trading lower by about 1.5%.