Among the largest underlying components of ERX, in trading today , and The Materials Select Sector SPDR Fund ( AMEX: XLE) is up by about 0.1%.

FORBES: ERX: ETF Outflow Alert

Among the largest underlying components of ERX, in trading today Alpha Natural Resources Incorporated ( ANR) is up about 2.5%, and Anadarko Petroleum Corporation ( APC) is up by about 0.4%.

FORBES: Oil Trends Reverse Leading to Large Outflow

Among the largest underlying components of ERX, in trading today Alpha Natural Resources Incorporated ( ANR) is up about 6.2%, and Anadarko Petroleum Corporation ( APC) is higher by about 3.4%.

FORBES: Traders Bullish on Energy ETF