** Shares of U.S. natural gas companies down, tracking fall in natgas futures NGA/

** U.S. natgas futures NGc1 down 1.4% at $3.8 per million British thermal unit

** Natural gas prices fell on rising output and forecasts for the heat wave blanketing the eastern half of the country to end in a few days

** Shares of natgas companies down: NextDecade NEXT.O 1% and New Fortress Energy NFE.O 6.7%

** EQT Corp EQT.N and Energy Transfer ET.N each down marginally

** ETFs — United States Natural Gas Fund UNG.P and ProShares Ultra Bloomberg Natural Gas BOIL.P fall 3.6% and 6.4%, respectively

(Reporting by Pooja Menon in Bengaluru)

((Pooja.Menon@thomsonreuters.com;))