SO

SEC source: 0001209191-21-010778 · doc4.xml · nonDerivative · entry 2

Crosswhite Mark A. · CIK 0001426400 · Chairman, President & CEO, APC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 101,843

F2 · security: Shares withheld to satisfy required state and federal tax withholding requirements.

SEC source: 0001209191-21-010778 · doc4.xml · nonDerivative · entry 1

Crosswhite Mark A. · CIK 0001426400 · Chairman, President & CEO, APC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 104,084

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Shares acquired upon vesting of second 1/3 of performance restricted stock units granted on February 11, 2019. Includes 414 accrued dividend equivalent units.

SEC source: 0001209191-21-010776 · doc4.xml · derivative · entry 4

Connally Stan W · CIK 0001498337 · Executive Vice President, SCS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,503

Underlying: Southern Company Common Stock · 2,502 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · security: Represents performance restricted stock units granted on February 11, 2019. The remaining 1/3 of the award will vest in 2022. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.exercise_date: Represents performance restricted stock units granted on February 11, 2019. The remaining 1/3 of the award will vest in 2022. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.expiration_date: Represents performance restricted stock units granted on February 11, 2019. The remaining 1/3 of the award will vest in 2022. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

SEC source: 0001209191-21-010776 · doc4.xml · nonDerivative · entry 2

Connally Stan W · CIK 0001498337 · Executive Vice President, SCS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 46,685

F2 · security: Shares withheld to satisfy required state and federal tax withholding requirements.

SEC source: 0001209191-21-010776 · doc4.xml · nonDerivative · entry 1

Connally Stan W · CIK 0001498337 · Executive Vice President, SCS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 47,895

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Shares acquired upon vesting of second 1/3 of performance restricted stock units granted on February 11, 2019. Includes 224 accrued dividend equivalent units.

SEC source: 0001209191-21-010774 · doc4.xml · derivative · entry 4

BOWERS WILLIAM P · CIK 0001225760 · Chairman & CEO, GPC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,073

Underlying: Southern Company Common Stock · 5,072 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · security: Represents performance restricted stock units granted on February 11, 2019. The remaining 1/3 of the award will vest in 2022. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.exercise_date: Represents performance restricted stock units granted on February 11, 2019. The remaining 1/3 of the award will vest in 2022. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.expiration_date: Represents performance restricted stock units granted on February 11, 2019. The remaining 1/3 of the award will vest in 2022. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

SEC source: 0001209191-21-010774 · doc4.xml · nonDerivative · entry 2

BOWERS WILLIAM P · CIK 0001225760 · Chairman & CEO, GPC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 164,183

F2 · security: Shares withheld to satisfy required state and federal tax withholding requirements.

SEC source: 0001209191-21-010774 · doc4.xml · nonDerivative · entry 1

BOWERS WILLIAM P · CIK 0001225760 · Chairman & CEO, GPC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 166,690

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Shares acquired upon vesting of second 1/3 of performance restricted stock units granted on February 11, 2019. Includes 453 accrued dividend equivalent units.

SEC source: 0001209191-21-010770 · doc4.xml · derivative · entry 6

Anderson Bryan D · CIK 0001831824 · EVP & Pres. External Affairs

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 621

Underlying: Southern Company Common Stock · 621 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · security: Represents restricted stock units granted on February 11, 2019. The remaining 1/3 of the award will vest in 2022. Each restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F5 · derivative.exercise_date: Represents restricted stock units granted on February 11, 2019. The remaining 1/3 of the award will vest in 2022. Each restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F5 · derivative.expiration_date: Represents restricted stock units granted on February 11, 2019. The remaining 1/3 of the award will vest in 2022. Each restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

SEC source: 0001209191-21-010770 · doc4.xml · derivative · entry 5

Anderson Bryan D · CIK 0001831824 · EVP & Pres. External Affairs

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 924

Underlying: Southern Company Common Stock · 463 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · security: Represents restricted stock units granted on February 11, 2020. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F4 · derivative.exercise_date: Represents restricted stock units granted on February 11, 2020. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F4 · derivative.expiration_date: Represents restricted stock units granted on February 11, 2020. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

SEC source: 0001209191-21-010770 · doc4.xml · nonDerivative · entry 4

Anderson Bryan D · CIK 0001831824 · EVP & Pres. External Affairs

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,676

SEC source: 0001209191-21-010770 · doc4.xml · nonDerivative · entry 3

Anderson Bryan D · CIK 0001831824 · EVP & Pres. External Affairs

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,935

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · security: Shares acquired upon vesting of first 1/3 of restricted stock units granted on February 11, 2020. Includes 20 accrued dividend equivalent units.

SEC source: 0001209191-21-010770 · doc4.xml · nonDerivative · entry 2

Anderson Bryan D · CIK 0001831824 · EVP & Pres. External Affairs

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,452

F2 · security: Shares withheld to satisfy required state and federal tax withholding requirements.

SEC source: 0001209191-21-010770 · doc4.xml · nonDerivative · entry 1

Anderson Bryan D · CIK 0001831824 · EVP & Pres. External Affairs

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,814

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Shares acquired upon vesting of second 1/3 of restricted stock units granted on February 11, 2019. Includes 56 accrued dividend equivalent units.

SEC source: 0001209191-21-009757 · doc4.xml · nonDerivative · entry 1

Kuczynski Stephen E · CIK 0001524757 · Pres. & CEO, Southern Nuclear

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 66,127.1563

F1 · security: Shares were sold pursuant to a Rule 10b5-1 plan.

SEC source: 0001209191-21-008202 · doc4.xml · derivative · entry 4

WOMACK CHRISTOPHER C · CIK 0001195423 · President, GPC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,587

Underlying: Southern Company Common Stock · 1,794 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · security: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.exercise_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.expiration_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

SEC source: 0001209191-21-008202 · doc4.xml · nonDerivative · entry 2

WOMACK CHRISTOPHER C · CIK 0001195423 · President, GPC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,257.4346

F2 · security: Shares withheld to satisfy required state and federal tax withholding requirements.

SEC source: 0001209191-21-008202 · doc4.xml · nonDerivative · entry 1

WOMACK CHRISTOPHER C · CIK 0001195423 · President, GPC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,172.4346

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on February 11, 2020. The Compensation Committee and Management Succession Committee certified performance on February 3, 2021. Includes 78 accrued dividend equivalent units.

SEC source: 0001209191-21-008204 · doc4.xml · derivative · entry 4

Connally Stan W · CIK 0001498337 · Executive Vice President, SCS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,202

Underlying: Southern Company Common Stock · 2,102 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · security: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.exercise_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.expiration_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

SEC source: 0001209191-21-008204 · doc4.xml · nonDerivative · entry 2

Connally Stan W · CIK 0001498337 · Executive Vice President, SCS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,169

F2 · security: Shares withheld to satisfy required state and federal tax withholding requirements.

SEC source: 0001209191-21-008204 · doc4.xml · nonDerivative · entry 1

Connally Stan W · CIK 0001498337 · Executive Vice President, SCS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 46,223

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on February 11, 2020. The Compensation Committee and Management Succession Committee certified performance on February 3, 2021. Includes 91 accrued dividend equivalent units.

SEC source: 0001209191-21-008201 · doc4.xml · derivative · entry 4

Wilson Anthony L · CIK 0001538652 · Pres & CEO, Mississippi Power

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,594

Underlying: Southern Company Common Stock · 1,298 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · security: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.exercise_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.expiration_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

SEC source: 0001209191-21-008201 · doc4.xml · nonDerivative · entry 2

Wilson Anthony L · CIK 0001538652 · Pres & CEO, Mississippi Power

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,946

F2 · security: Shares withheld to satisfy required state and federal tax withholding requirements.

SEC source: 0001209191-21-008201 · doc4.xml · nonDerivative · entry 1

Wilson Anthony L · CIK 0001538652 · Pres & CEO, Mississippi Power

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,619

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on February 11, 2020. The Compensation Committee and Management Succession Committee certified performance on February 3, 2021. Includes 56 accrued dividend equivalent units.

SEC source: 0001209191-21-008199 · doc4.xml · derivative · entry 3

Kuczynski Stephen E · CIK 0001524757 · Pres. & CEO, Southern Nuclear

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,943

Underlying: Southern Company Common Stock · 2,972 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · security: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.exercise_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.expiration_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

SEC source: 0001209191-21-008199 · doc4.xml · nonDerivative · entry 2

Kuczynski Stephen E · CIK 0001524757 · Pres. & CEO, Southern Nuclear

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 68,627.1563

F2 · security: Shares withheld to satisfy required state and federal tax withholding requirements.

SEC source: 0001209191-21-008199 · doc4.xml · nonDerivative · entry 1

Kuczynski Stephen E · CIK 0001524757 · Pres. & CEO, Southern Nuclear

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 70,094.1563

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on February 11, 2020. The Compensation Committee and Management Succession Committee certified performance on February 3, 2021. Includes 128 accrued dividend equivalent units.

SEC source: 0001209191-21-008197 · doc4.xml · derivative · entry 4

Lantrip Mark · CIK 0001600639 · Chairman, President & CEO, SCS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,786

Underlying: Southern Company Common Stock · 1,893 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · security: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.exercise_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.expiration_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

SEC source: 0001209191-21-008197 · doc4.xml · nonDerivative · entry 2

Lantrip Mark · CIK 0001600639 · Chairman, President & CEO, SCS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 47,817.847

F2 · security: Shares withheld to satisfy required state and federal tax withholding requirements.

SEC source: 0001209191-21-008197 · doc4.xml · nonDerivative · entry 1

Lantrip Mark · CIK 0001600639 · Chairman, President & CEO, SCS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 48,785.847

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on February 11, 2020. The Compensation Committee and Management Succession Committee certified performance on February 3, 2021. Includes 82 accrued dividend equivalent units.

SEC source: 0001209191-21-008198 · doc4.xml · derivative · entry 4

Kerr, II James Y · CIK 0001601624 · EVP, Chief Legal Officer & CCO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,973

Underlying: Southern Company Common Stock · 2,487 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · security: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.exercise_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.expiration_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

SEC source: 0001209191-21-008198 · doc4.xml · nonDerivative · entry 2

Kerr, II James Y · CIK 0001601624 · EVP, Chief Legal Officer & CCO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 68,684

F2 · security: Shares withheld to satisfy required state and federal tax withholding requirements.

SEC source: 0001209191-21-008198 · doc4.xml · nonDerivative · entry 1

Kerr, II James Y · CIK 0001601624 · EVP, Chief Legal Officer & CCO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 69,801

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on February 11, 2020. The Compensation Committee and Management Succession Committee certified performance on February 3, 2021. Includes 108 accrued dividend equivalent units.

SEC source: 0001209191-21-008194 · doc4.xml · derivative · entry 4

BOWERS WILLIAM P · CIK 0001225760 · Chairman & CEO, GPC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,732

Underlying: Southern Company Common Stock · 4,867 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · security: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.exercise_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.expiration_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

SEC source: 0001209191-21-008194 · doc4.xml · nonDerivative · entry 2

BOWERS WILLIAM P · CIK 0001225760 · Chairman & CEO, GPC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 161,165

F2 · security: Shares withheld to satisfy required state and federal tax withholding requirements.

SEC source: 0001209191-21-008194 · doc4.xml · nonDerivative · entry 1

BOWERS WILLIAM P · CIK 0001225760 · Chairman & CEO, GPC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 163,519

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on February 11, 2020. The Compensation Committee and Management Succession Committee certified performance on February 3, 2021. Includes 210 accrued dividend equivalent units.

SEC source: 0001209191-21-008188 · doc4.xml · derivative · entry 3

Evans Andrew W · CIK 0001338158 · Executive Vice President & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,888

Underlying: Southern Company Common Stock · 3,445 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · security: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.exercise_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.expiration_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

SEC source: 0001209191-21-008188 · doc4.xml · nonDerivative · entry 2

Evans Andrew W · CIK 0001338158 · Executive Vice President & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 146,989

F2 · security: Shares withheld to satisfy required state and federal tax withholding requirements.

SEC source: 0001209191-21-008188 · doc4.xml · nonDerivative · entry 1

Evans Andrew W · CIK 0001338158 · Executive Vice President & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 148,680

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on February 11, 2020. The Compensation Committee and Management Succession Committee certified performance on February 3, 2021. Includes 149 accrued dividend equivalent units.

SEC source: 0001209191-21-008172 · doc4.xml · derivative · entry 3

Greene Kimberly S, · CIK 0001573512 · Chairman, President & CEO, GAS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,411

Underlying: Southern Company Common Stock · 2,706 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · security: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.exercise_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.expiration_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

SEC source: 0001209191-21-008172 · doc4.xml · nonDerivative · entry 2

Greene Kimberly S, · CIK 0001573512 · Chairman, President & CEO, GAS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 51,767

F2 · security: Shares withheld to satisfy required state and federal tax withholding requirements.

SEC source: 0001209191-21-008172 · doc4.xml · nonDerivative · entry 1

Greene Kimberly S, · CIK 0001573512 · Chairman, President & CEO, GAS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 53,114

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on February 11, 2020. The Compensation Committee and Management Succession Committee certified performance on February 3, 2021. Includes 117 accrued dividend equivalent units.

SEC source: 0001209191-21-008162 · doc4.xml · derivative · entry 1

Daiss Ann P · CIK 0001354912 · Comptroller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,213

Underlying: Southern Company Common Stock · 2,213 shares

Expires not disclosed

F1 · security: Restricted stock units are payable in Southern Company common stock and vest one-third per year on the first, second and third anniversary of grant date. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F1 · derivative.exercise_date: Restricted stock units are payable in Southern Company common stock and vest one-third per year on the first, second and third anniversary of grant date. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F1 · derivative.expiration_date: Restricted stock units are payable in Southern Company common stock and vest one-third per year on the first, second and third anniversary of grant date. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

SEC source: 0001209191-21-008153 · doc4.xml · derivative · entry 5

Crosswhite Mark A. · CIK 0001426400 · Chairman, President & CEO, APC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,873

Underlying: Southern Company Common Stock · 3,437 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · security: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.exercise_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.expiration_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

SEC source: 0001209191-21-008153 · doc4.xml · nonDerivative · entry 2

Crosswhite Mark A. · CIK 0001426400 · Chairman, President & CEO, APC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 99,034

F2 · security: Shares withheld to satisfy required state and federal tax withholding requirements.

SEC source: 0001209191-21-008153 · doc4.xml · nonDerivative · entry 1

Crosswhite Mark A. · CIK 0001426400 · Chairman, President & CEO, APC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 100,684

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on February 11, 2020. The Compensation Committee and Management Succession Committee certified performance on February 3, 2021. Includes 148 accrued dividend equivalent units.

SEC source: 0001209191-21-008147 · doc4.xml · derivative · entry 4

FANNING THOMAS A · CIK 0001227464 · President, CEO & Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,247

Underlying: Southern Company Common Stock · 14,124 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · security: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.exercise_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

F3 · derivative.expiration_date: Represents performance share units granted on February 11, 2020. The Compensation and Management Succession Committee certified performance on February 3, 2021 and the first 1/3 vested. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each performance restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

SEC source: 0001209191-21-008147 · doc4.xml · nonDerivative · entry 2

FANNING THOMAS A · CIK 0001227464 · President, CEO & Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 627,392.586

F2 · security: Shares withheld to satisfy required state and federal tax withholding requirements.

SEC source: 0001209191-21-008147 · doc4.xml · nonDerivative · entry 1

FANNING THOMAS A · CIK 0001227464 · President, CEO & Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 634,075.586

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on February 11, 2020. The Compensation Committee and Management Succession Committee certified performance on February 3, 2021. Includes 608 accrued dividend equivalent units.

SEC source: 0001209191-21-003269 · doc4.xml · nonDerivative · entry 1

Kuczynski Stephen E · CIK 0001524757 · Pres. & CEO, Southern Nuclear

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 66,994.1563

F1 · security: Shares were sold pursuant to a Rule 10b5-1 plan.