BUZZ-Natgas firms rise on strong heating demand

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%