On a day where the Dow suffered an intraday record drop of more than 1,000 points, shares of Atlanta-based AGL Resources are up more than 25 percent.
Southern was down about 3 percent at 11:15 a.m.
U.S. stocks joined a global rout Monday with the Dow Jones industrial average trading as much as 1,089 points after the opening bell. The market rallied somewhat before noon with the Dow trading about 200 to 300 points lower than open.
Before today, the largest intraday point drop in Dow history occurred Oct. 10, 2008, when the index lost 1,018 points.