According to the ETF Finder at ETF Channel, STO makes up 3.94% of the First Trust ISE-Revere Natural Gas Index Fund ETF ( AMEX: FCG) which is trading up by about 6.2% on the day Thursday.
According to the ETF Finder at ETF Channel, STO makes up 3.78% of the First Trust ISE-Revere Natural Gas Index Fund ETF ( AMEX: FCG) which is trading lower by about 2.9% on the day Tuesday.