** Shares of U.S. natural gas companies dip in thin pre-holiday trading, tracking fall in natgas futures NGA

** U.S. natgas futures NGc1 down 6.3 cents at $4.35 per million British thermal unit

** Natgas companies: CNX Resources CNX.N down 1%; Expand Energy EXE.O and EQT Corp EQT.N both down 1.4%

** Natgas ETFs: United States Natural Gas Fund UNG.P down 4.1% and ProShares Ultra Bloomberg Natural Gas BOIL.P down 4%

(Reporting by Dharna Bafna)

((Dharna.bafna@thomsonreuters.com))