** Shares of U.S. natural gas companies rise as natgas futures jump about 6% to a one-month high NGA/

** U.S. natgas futures NGc1 up 6.6% at $4.27 per million British thermal units (mmBtu), putting the contract on track for its highest close since January 16

** Natural gas prices rise as extreme cold in some parts of the country boosted demand for the fuel for heating and cut output by freezing oil and gas wells

** Natgas firms Cheniere Energy LNG.N up 2.5%, Williams Companies WMB.N rises 2.2%

** ETFs United States Natural Gas Fund UNG.P up 4.9% and ProShares Ultra Bloomberg Natural Gas BOIL.P rises 9.3%

(Reporting by Pooja Menon in Bengaluru)

((Pooja.Menon@thomsonreuters.com))