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

** U.S. natural gas futures NGc1 jump 22.6% to $4.791 per million British thermal units, after soaring 26% in the previous session

** Prices climb on expectations that extreme cold will boost heating demand to near-record levels, while also cutting output by freezing oil and gas wells

** Natgas companies: Cheniere Energy LNG.N up 1.4%; Expand Energy EXE.O gains 5.7%; Williams Companies WMB.N rises 1.9%

** CNX Resources CNX.N rises ~5%; EQT Corp EQT.N up 5.7%

** Natgas ETFS: United States Natural Gas Fund UNG.P up 10.1%; ProShares Ultra Bloomberg Natural Gas BOIL.P gains 20.3%

(Reporting by Sumit Saha in Bengaluru)

((Sumit.Saha@thomsonreuters.com;))