X0306 4 2018-02-12 0 0000092122 SOUTHERN CO SO 0001600639 Lantrip Mark 30 IVAN ALLEN JR. BLVD., NW ATLANTA GA 30308 0 1 0 0 President & CEO, SCS Southern Company Common Stock 2018-02-12 4 M 0 2359 0.00 A 8470.026 D Southern Company Common Stock 2018-02-12 4 F 0 776 44.68 D 7694.026 D Southern Company Common Stock 2018-02-12 4 A 0 14633 0.00 A 22327.026 D Southern Company Common Stock 2018-02-12 4 F 0 4438 44.68 D 17889.026 D Performance Restricted Stock Units 0.00 2018-02-12 4 M 0 2256 0.00 D Southern Company Common Stock 2256 4510 D Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on February 13, 2017. The Compensation and Management Succession Committee certified performance on February 12, 2018. Includes 103 accrued dividend equivalent units. Shares withheld to satisfy required state and federal tax withholding requirements. Shares acquired upon vesting of performance share units under Company's Performance Share Program for the 2015-2017 award. The Compensation and Management Succession Committee certified performance on February 12, 2018. Includes accrued dividend equivalent units. Represents performance restricted stock units granted on February 13, 2017. The Compensation and Management Succession Committee certified performance on February 12, 2018 and the first 1/3 vested. The remaining award will vest 1/3 in 2019 and 1/3 in 2020. Each performance restricted stock unit represents the right to receive, at settlement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements. /s/ Laura O. Hewett, Attorney-in-Fact for Mark Lantrip 2018-02-14