Benzinga's Top #PreMarket Gainers By: Benzinga via Benzinga August 24, 2015 at 08:12 AM EDT AGL Resources Inc. (NYSE: GAS) gained 32.68 percent to $63.50 in pre-market trading after Southern Co (NYSE: SO) announced its plans ... Read More >> Related Stocks: AGL Resources Central EUR Med A Martin Midstrm LP Southern Co Tuesday Morning Company