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

** U.S. natgas futures NGc1 down ~2% at $3.38 per million British thermal unit

** Natural gas futures eased ahead of a federal report expected to show last week's storage build was slightly bigger than usual for this time of year, keeping ample amounts of fuel in inventory

** Shares of natgas cos Williams Companies WMB.N, EQT Corp EQT.N and Venture Global VG.N fall between 1% and 3.5%

** ETFs ProShares Ultra Bloomberg Natural Gas BOIL.P and United States Natural Gas Fund UNG.P down ~1% and 0.8%, respectively

(Reporting by Varun Sahay)

((Varun.sahay@thomsonreuters.com))