The United States Natural Gas Fund, an ETF that trades under the symbol UNG, opens the trading week at $11.80 a share. UNG gained 4.15% on Friday but remains down 10% year to date. The perpetually contango plagued ETF has traded between a 52 week low of $10.02 and a 52 week high of $17.68 a share. UNG is the largest natural gas ETF. According to UNG's website the ETF closed at a discount of 0.09 percent on March 24.