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

** U.S. natgas futures NGc1 down 3.2% at $3.24 per million British thermal unit

** Natural gas futures eased to a one-week low on a small output increase in recent days and ample amounts of fuel in storage

** Forecasts for more demand over the next two weeks than previously expected and near-record flows of gas to liquefied natural gas export plants weighed on prices

** Shares of natgas companies: CNX Resources CNX.N and EQT Corp EQT.N each down marginally, Williams Companies WMB.N falls 1.6%

** NextDecade Corp NEXT.O down marginally and New Fortress Energy NFE.O down 2.3%

** ETFs United States Natural Gas Fund UNG.P down 1.8%, and ProShares Ultra Bloomberg Natural Gas BOIL.P falls ~3%

(Reporting by Pooja Menon in Bengaluru)

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