According to the ETF Finder at ETF Channel, CRK makes up 3.20% of the First Trust ISE-Revere Natural Gas Index Fund ETF ( AMEX: FCG) which is trading relatively unchanged on the day Monday.
Among the largest underlying components of XOP, in trading today Resolute Energy Corp ( NYSE: REN) is down about 3.2%, Approach Resources Inc ( NASD: AREX) is off about 2.6%, and Comstock Resources, Inc. ( NYSE: CRK) is lower by about 3.4%.