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

** U.S. natgas futures NGc1 down 3.3% at $3.49 per million British thermal unit

** Natgas prices slide, marking a fourth consecutive session of losses, pressured by forecasts for warmer weather nationwide and lower demand projections in the coming weeks

** Natgas companies fall: CNX Resources CNX.N 5%, EQT Corp EQT.N 1.4% and Energy Transfer ET.N 1%

** Williams Companies WMB.N down marginally, NextDecade NEXT.O dips 3.4% and Sempra SRE.N falls 3.2%

** ETFs United States Natural Gas Fund UNG.P down 3.7%, and ProShares Ultra Bloomberg Natural Gas BOIL.P falls 11%

(Reporting by Pooja Menon in Bengaluru)

((Pooja.Menon@thomsonreuters.com))