US natural gas futures increased 1.6% to $2.86 per MMBtu on May 10–17—the highest level in three months. Natural gas prices increased due to warm weather forecasts. The United States Natural Gas ETF (UNG) and the SPDR S&P Oil & Gas Exploration & Production ETF (XOP) increased ~1.7% and ~4.7%, respectively, on May 10–17. UNG seeks to track active natural gas futures. XOP aims to follow the performance of the S&P Oil & Gas Exploration & Production Select Industry Index.