** Shares of U.S. natural gas companies dip, tracking fall in natgas futures NGA
** U.S. natgas futures NGc1 down 6.3 cents at $4.35 per million British thermal units
** Prices fall on forecasts for mild weather and lower demand for heating over the next two weeks
** Natgas companies: Cheniere Energy LNG.N down 1.7%; Expand Energy EXE.O down ~2%; Williams Companies WMB.N down 2.6%
** Natgas ETFs: United States Natural Gas Fund UNG.P down 3.2%; ProShares Ultra Bloomberg Natural Gas BOIL.P down 1.8%
(Reporting by Dharna Bafna)
((Dharna.bafna@thomsonreuters.com))