X0306 4 2016-12-31 0 0000092122 SOUTHERN CO SO 0001338158 Evans Andrew W 30 IVAN ALLEN JR. BLVD., NW ATLANTA GA 30308 0 1 0 0 Pres & CEO, Southern Co. Gas Southern Company Common Stock 2016-12-31 4 M 0 28704 0.00 A 28704 D Southern Company Common Stock 2016-12-31 4 F 0 17388 49.19 D 11316 D Southern Co Restricted Stock Units 0.00 2016-12-31 4 M 0 28704 0.00 D 2016-12-31 2016-12-31 Southern Company Common Stock 28704 84035 D In a review of our records, it was determined that the Form 4 to report the vesting of the December 31, 2016 tranche of the RSU award granted on July 1, 2016 was inadvertently missed. This Form 4 is being filed to report the December 31, 2016 vesting and reflects share ownership as of such time. Each restricted stock unit (RSU) represents the right to receive, at settlement, one share of common stock. Shares withheld to satisfy required state and federal tax withholding requirements. As reported in a Form 4 filed on July 6, 2016, in accordance with the Agreement and Plan of Merger dated August 23, 2015 by and among AGL Resources Inc., The Southern Company and AMS Corp., outstanding performance share units of AGL Resources Inc. were assumed by Southern Company and converted into time vesting RSUs of Southern Company. Vesting of the RSUs is as follows: 28,704 RSUs vest December 31, 2016; 37,980 RSUs vest December 31, 2017; and 46,055 RSUs vest December 31, 2018. /s/ Laura O. Hewett, Attorney-in-Fact for Andrew W. Evans 2018-01-03