X0306 4 2019-02-13 0 0000092122 SOUTHERN CO SO 0001426400 Crosswhite Mark A. 30 IVAN ALLEN JR. BLVD ATLANTA GA 30308 0 1 0 0 President & CEO, APC Southern Company Common Stock 2019-02-13 4 M 0 4768 0.00 A 64718 D Southern Company Common Stock 2019-02-13 4 F 0 2116 49.22 D 62602 D Southern Company Common Stock 13729.9086 I By 401(k) Trustee Performance Restricted Stock Units 0.00 2019-02-13 4 M 0 4330 0.00 D Southern Company Common Stock 4330 4330 D Shares acquired upon vesting of second 1/3 of performance restricted stock units granted on February 13, 2017. The Compensation and Management Succession Committee certified performance on February 13, 2018. Includes 438 accrued dividend equivalent units. Shares withheld to satisfy required state and federal tax withholding requirements. Represents performance restricted stock units granted on February 13, 2017. The remaining portion of the award will vest 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/ Marcia R. DeMar, Attorney-in-Fact for Mark A. Crosswhite 2019-02-15