US natural gas futures increased 3.2% on May 3–10. Natural gas prices increased due to a lower increase in natural gas inventories. The United States Natural Gas ETF (UNG) and the First Trust Natural Gas ETF (FCG) increased ~3% and ~6%, respectively, on May 3–10. UNG seeks to track active natural gas futures. FCG seeks to track the performance of the index of companies involved in natural gas exploration and production.