Southern Co. (SO) closed the most recent trading day at $77.57, moving -0.6% from the previous trading session. This change lagged the S&P 500's 0.41% loss on the day. At the same time, the Dow lost 0.12%, and the tech-heavy Nasdaq lost 0.71%.Prior to today's trading, shares of the power company had lost 0.05% over the past month. This has was narrower than the Utilities sector's loss of 3.1% and lagged the S&P 500's gain of 3.53% in that time.Investors will be eagerly watching for the performance of Southe ...