SO

SEC source: 0000950170-25-016413 · ownership.xml · nonDerivative · entry 2

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP & CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 90,255

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

SEC source: 0000950170-25-016413 · ownership.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP & CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 91,045

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 · shares: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on January 31, 2024. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes 63 accrued dividend equivalent units.

SEC source: 0000950170-25-016422 · ownership.xml · derivative · entry 5

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,831

Underlying: Southern Company Common Stock · 1,916 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 · shares: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

F4 · derivative.exercise_date: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

F4 · derivative.expiration_date: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

SEC source: 0000950170-25-016422 · ownership.xml · nonDerivative · entry 4

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 56,794

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

SEC source: 0000950170-25-016422 · ownership.xml · nonDerivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 67,358

F3 · shares: Shares acquired upon vesting of performance share units under Company's Performance Share Program for the 2022-2024 award. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes accrued dividend equivalent units.

SEC source: 0000950170-25-016422 · ownership.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,274

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

SEC source: 0000950170-25-016422 · ownership.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 47,361

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 · shares: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on January 31, 2024. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes 70 accrued dividend equivalent units.

SEC source: 0000950170-25-016412 · ownership.xml · derivative · entry 6

Tucker Daniel S · CIK 0001881495 · EVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,526

Underlying: Southern Company Common Stock · 2,763 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 · shares: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

F4 · derivative.exercise_date: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

F4 · derivative.expiration_date: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

SEC source: 0000950170-25-016412 · ownership.xml · nonDerivative · entry 4

Tucker Daniel S · CIK 0001881495 · EVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 72,198

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

SEC source: 0000950170-25-016412 · ownership.xml · nonDerivative · entry 3

Tucker Daniel S · CIK 0001881495 · EVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 90,819

F3 · shares: Shares acquired upon vesting of performance share units under Company's Performance Share Program for the 2022-2024 award. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes accrued dividend equivalent units.

SEC source: 0000950170-25-016412 · ownership.xml · nonDerivative · entry 2

Tucker Daniel S · CIK 0001881495 · EVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,109

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

SEC source: 0000950170-25-016412 · ownership.xml · nonDerivative · entry 1

Tucker Daniel S · CIK 0001881495 · EVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,520

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 · shares: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on January 31, 2024. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes 101 accrued dividend equivalent units.

SEC source: 0000950170-25-016421 · ownership.xml · derivative · entry 6

Drake Sloane N · CIK 0001971188 · EVP & CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,946

Underlying: Southern Company Common Stock · 1,473 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 · shares: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

F4 · derivative.exercise_date: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

F4 · derivative.expiration_date: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

SEC source: 0000950170-25-016421 · ownership.xml · nonDerivative · entry 4

Drake Sloane N · CIK 0001971188 · EVP & CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,314

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

SEC source: 0000950170-25-016421 · ownership.xml · nonDerivative · entry 3

Drake Sloane N · CIK 0001971188 · EVP & CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,169

F3 · shares: Shares acquired upon vesting of performance share units under Company's Performance Share Program for the 2022-2024 award. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes accrued dividend equivalent units.

SEC source: 0000950170-25-016421 · ownership.xml · nonDerivative · entry 2

Drake Sloane N · CIK 0001971188 · EVP & CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,535

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

SEC source: 0000950170-25-016421 · ownership.xml · nonDerivative · entry 1

Drake Sloane N · CIK 0001971188 · EVP & CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,298

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 · shares: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on January 31, 2024. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes 54 accrued dividend equivalent units.

SEC source: 0000950170-25-016419 · ownership.xml · derivative · entry 5

Sena Peter P III · CIK 0002023851 · Chairman,President & CEO, SNC

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,334

Underlying: Southern Company Common Stock · 668 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 · shares: Represents first 1/3 of performance restricted stock units granted on June 28, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

F4 · derivative.exercise_date: Represents first 1/3 of performance restricted stock units granted on June 28, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

F4 · derivative.expiration_date: Represents first 1/3 of performance restricted stock units granted on June 28, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

SEC source: 0000950170-25-016419 · ownership.xml · nonDerivative · entry 4

Sena Peter P III · CIK 0002023851 · Chairman,President & CEO, SNC

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,018

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

SEC source: 0000950170-25-016419 · ownership.xml · nonDerivative · entry 3

Sena Peter P III · CIK 0002023851 · Chairman,President & CEO, SNC

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,502

F3 · shares: Shares acquired upon vesting of performance share units under Company's Performance Share Program for the 2022-2024 award. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes accrued dividend equivalent units

SEC source: 0000950170-25-016419 · ownership.xml · nonDerivative · entry 2

Sena Peter P III · CIK 0002023851 · Chairman,President & CEO, SNC

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,121

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

SEC source: 0000950170-25-016419 · ownership.xml · nonDerivative · entry 1

Sena Peter P III · CIK 0002023851 · Chairman,President & CEO, SNC

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,424

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 · shares: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on June 28, 2024. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes 12 accrued dividend equivalent units.

SEC source: 0000950170-25-016410 · ownership.xml · derivative · entry 6

Cummiskey Christopher · CIK 0001642170 · EVP & CCO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,348

Underlying: Southern Company Common Stock · 1,674 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 · shares: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

F4 · derivative.exercise_date: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

F4 · derivative.expiration_date: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

SEC source: 0000950170-25-016410 · ownership.xml · nonDerivative · entry 4

Cummiskey Christopher · CIK 0001642170 · EVP & CCO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 34,837.4417

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

SEC source: 0000950170-25-016410 · ownership.xml · nonDerivative · entry 3

Cummiskey Christopher · CIK 0001642170 · EVP & CCO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,074.4417

F3 · shares: Shares acquired upon vesting of performance share units under Company's Performance Share Program for the 2022-2024 award. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes accrued dividend equivalent units.

SEC source: 0000950170-25-016410 · ownership.xml · nonDerivative · entry 2

Cummiskey Christopher · CIK 0001642170 · EVP & CCO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,384.4417

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

SEC source: 0000950170-25-016410 · ownership.xml · nonDerivative · entry 1

Cummiskey Christopher · CIK 0001642170 · EVP & CCO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,238.4417

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 · shares: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on January 31, 2024. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes 62 accrued dividend equivalent units.

SEC source: 0000950170-25-016418 · ownership.xml · derivative · entry 6

Wilson Anthony L · CIK 0001538652 · Chairman, President & CEO, MPC

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,185

Underlying: Southern Company Common Stock · 1,593 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 · shares: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

F4 · derivative.exercise_date: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

F4 · derivative.expiration_date: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

SEC source: 0000950170-25-016418 · ownership.xml · nonDerivative · entry 4

Wilson Anthony L · CIK 0001538652 · Chairman, President & CEO, MPC

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 97,084

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

SEC source: 0000950170-25-016418 · ownership.xml · nonDerivative · entry 3

Wilson Anthony L · CIK 0001538652 · Chairman, President & CEO, MPC

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 105,911

F3 · shares: Shares acquired upon vesting of performance share units under Company's Performance Share Program for the 2022-2024 award. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes accrued dividend equivalent units.

SEC source: 0000950170-25-016418 · ownership.xml · nonDerivative · entry 2

Wilson Anthony L · CIK 0001538652 · Chairman, President & CEO, MPC

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 85,873

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

SEC source: 0000950170-25-016418 · ownership.xml · nonDerivative · entry 1

Wilson Anthony L · CIK 0001538652 · Chairman, President & CEO, MPC

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 86,675

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 · shares: )Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on January 31, 2024. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes 59 accrued dividend equivalent units.

SEC source: 0000950170-25-016409 · ownership.xml · derivative · entry 6

Connally Stan W · CIK 0001498337 · EVP & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,916

Underlying: Southern Company Common Stock · 2,459 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 · shares: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

F4 · derivative.exercise_date: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

F4 · derivative.expiration_date: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

SEC source: 0000950170-25-016409 · ownership.xml · nonDerivative · entry 4

Connally Stan W · CIK 0001498337 · EVP & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 160,573

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

SEC source: 0000950170-25-016409 · ownership.xml · nonDerivative · entry 3

Connally Stan W · CIK 0001498337 · EVP & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 176,780

F3 · shares: Shares acquired upon vesting of performance share units under Company's Performance Share Program for the 2022-2024 award. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes accrued dividend equivalent units.

SEC source: 0000950170-25-016409 · ownership.xml · nonDerivative · entry 2

Connally Stan W · CIK 0001498337 · EVP & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 140,239

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

SEC source: 0000950170-25-016409 · ownership.xml · nonDerivative · entry 1

Connally Stan W · CIK 0001498337 · EVP & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 141,487

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 · shares: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on January 31, 2024. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes 90 accrued dividend equivalent units.

SEC source: 0000950170-25-016417 · ownership.xml · derivative · entry 4

Poroch David P. · CIK 0001616250 · Comptroller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,753

Underlying: Southern Company Common Stock · 1,753 shares

Expires not disclosed

F3 · shares: Restricted stock units are payable in Southern Company common stock and vest 1/3 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. The grant was approved by the Compensation and Talent Development Committee on February 5, 2025.

F3 · derivative.exercise_date: Restricted stock units are payable in Southern Company common stock and vest 1/3 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. The grant was approved by the Compensation and Talent Development Committee on February 5, 2025.

F3 · derivative.expiration_date: Restricted stock units are payable in Southern Company common stock and vest 1/3 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. The grant was approved by the Compensation and Talent Development Committee on February 5, 2025.

SEC source: 0000950170-25-016417 · ownership.xml · nonDerivative · entry 2

Poroch David P. · CIK 0001616250 · Comptroller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,566

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

SEC source: 0000950170-25-016417 · ownership.xml · nonDerivative · entry 1

Poroch David P. · CIK 0001616250 · Comptroller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,294

F1 · shares: Shares acquired upon vesting of performance share units under Company's Performance Share Program for the 2022-2024 award. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes accrued dividend equivalent units

SEC source: 0000950170-25-016408 · ownership.xml · derivative · entry 6

Spainhour Sterling A Jr. · CIK 0001849295 · EVP & CLO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,142

Underlying: Southern Company Common Stock · 2,572 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 · shares: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

F4 · derivative.exercise_date: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

F4 · derivative.expiration_date: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

SEC source: 0000950170-25-016408 · ownership.xml · nonDerivative · entry 4

Spainhour Sterling A Jr. · CIK 0001849295 · EVP & CLO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,352

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

SEC source: 0000950170-25-016408 · ownership.xml · nonDerivative · entry 3

Spainhour Sterling A Jr. · CIK 0001849295 · EVP & CLO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,367

F3 · shares: Shares acquired upon vesting of performance share units under Company's Performance Share Program for the 2022-2024 award. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes accrued dividend equivalent units.

SEC source: 0000950170-25-016408 · ownership.xml · nonDerivative · entry 2

Spainhour Sterling A Jr. · CIK 0001849295 · EVP & CLO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,376

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

SEC source: 0000950170-25-016408 · ownership.xml · nonDerivative · entry 1

Spainhour Sterling A Jr. · CIK 0001849295 · EVP & CLO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,567

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 · shares: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on January 31, 2024. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes 94 accrued dividend equivalent units.

SEC source: 0000950170-25-016407 · ownership.xml · derivative · entry 6

Peoples James Jeffrey · CIK 0001815666 · Chairman, President & CEO, APC

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,309

Underlying: Southern Company Common Stock · 3,155 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 · shares: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

F4 · derivative.exercise_date: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

F4 · derivative.expiration_date: Represents first 1/3 of performance restricted stock units granted on January 31, 2024. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each 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.

SEC source: 0000950170-25-016407 · ownership.xml · nonDerivative · entry 4

Peoples James Jeffrey · CIK 0001815666 · Chairman, President & CEO, APC

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,776

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

SEC source: 0000950170-25-016407 · ownership.xml · nonDerivative · entry 3

Peoples James Jeffrey · CIK 0001815666 · Chairman, President & CEO, APC

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,341

F3 · shares: Shares acquired upon vesting of performance share units under Company's Performance Share Program for the 2022-2024 award. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes accrued dividend equivalent units.

SEC source: 0000950170-25-016407 · ownership.xml · nonDerivative · entry 2

Peoples James Jeffrey · CIK 0001815666 · Chairman, President & CEO, APC

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,050

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

SEC source: 0000950170-25-016407 · ownership.xml · nonDerivative · entry 1

Peoples James Jeffrey · CIK 0001815666 · Chairman, President & CEO, APC

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,652

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 · shares: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on January 31, 2024. The Compensation and Talent Development Committee certified performance on February 5, 2025. Includes 116 accrued dividend equivalent units.