Nat Gas Bottom? Bloomberg reports the worst may be over for U.S. natural gas companies. Investors who purchased a net $114 million of XTO Energy (XTO) and Chesapeake Energy (CHK) last week may see the stock prices rise by about 20% between now and the end of the year as colder weather arrives and cheap valuations make these companies look attractive.XTO’s 31% drop in July was the main reason Ospraie Management was forced to shut down its largest hedge fund and to date nat. gas futures have fallen about 44% since June 30. But futures now show prices may ...