Natgas companies gain on smaller-than-expected storage build

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

** U.S. natgas futures NGc1 up 3.2% at $2.94 per million British thermal unit after U.S. Energy Information Administration (EIA) reports smaller-than-expected storage build

** Shares of natgas companies EQT Corp EQT.N up 2.3%, Energy Transfer ET.N and Williams Companies WMB.N each rise marginally

** NextDecade NEXT.O and Cheniere Energy LNG.N each up marginally

** ETFs — United States Natural Gas Fund UNG.P up 2.6% and ProShares Ultra Bloomberg Natural Gas BOIL.P gains 3.9%