DAVIS MARTIN BERNARD

SEC source: 0001674959-26-000001 · primarydocument.xml · derivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,050

Underlying: Common Stock · 1,050 shares

Expires 2026-11-01

F1 · derivative.exercise_date: Number of common shares issued pursuant to the time vested Restricted Share Units ("RSUs") granted on 5/1/2026 as part of the stock component of the annual director fees. These RSUs cliff vested on 11/1/2026.

SEC source: 0001674959-25-000003 · primarydocument.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,639

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 · kind: Number of common shares issued pursuant to the time vested Restricted Share Units ("RSUs") granted on 5/1/2025 as part of the stock component of the annual director fees. These RSUs cliff vested on 11/1/25.

SEC source: 0001562180-25-003485 · primarydocument.xml · derivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,136

Underlying: Common Stock · 1,136 shares

Expires 2025-11-01

F1 · derivative.exercise_date: Number of common shares issued pursuant to the time vested Restricted Share Units ("RSUs") granted on 5/1/2025 as part of the stock component of the annual director fees. These RSUs cliff vested on 11/1/25.

SEC source: 0000950170-25-031368 · ownership.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP & CIO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 102,090

SEC source: 0000950170-25-022170 · ownership.xml · derivative · entry 3

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP & CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

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.

F3 · shares: Represents final 1/3 of performance restricted stock units granted on February 13, 2022. 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.

F3 · derivative.exercise_date: Represents final 1/3 of performance restricted stock units granted on February 13, 2022. 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.

F3 · derivative.expiration_date: Represents final 1/3 of performance restricted stock units granted on February 13, 2022. 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: 0000950170-25-022170 · ownership.xml · nonDerivative · entry 2

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP & CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 103,215

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

SEC source: 0000950170-25-022170 · ownership.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP & CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 104,013

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 final 1/3 of performance restricted stock units granted on February 13, 2022. Includes 191 accrued dividend equivalent units.

SEC source: 0000950170-25-016413 · ownership.xml · derivative · entry 5

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP & CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,408

Underlying: Southern Company Common Stock · 1,705 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: 0000950170-25-016413 · ownership.xml · nonDerivative · entry 4

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP & CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 102,229

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

SEC source: 0000950170-25-016413 · ownership.xml · nonDerivative · entry 3

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP & CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,886

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: 0000950170-25-016413 · 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: 0000950170-25-013205 · ownership.xml · derivative · entry 3

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,607

Underlying: Southern Company Common Stock · 1,607 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 · shares: Represents second 1/3 of performance restricted stock units granted on February 1, 2023. The remaining award will vest in 2026. 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.

F3 · derivative.exercise_date: Represents second 1/3 of performance restricted stock units granted on February 1, 2023. The remaining award will vest in 2026. 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.

F3 · derivative.expiration_date: Represents second 1/3 of performance restricted stock units granted on February 1, 2023. The remaining award will vest in 2026. 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: 0000950170-25-013205 · ownership.xml · nonDerivative · entry 2

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 89,277

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

SEC source: 0000950170-25-013205 · ownership.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 90,128

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 second 1/3 of performance restricted stock units granted on February 1, 2023. Includes 128 accrued dividend equivalent units.

SEC source: 0000950170-24-134060 · ownership.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 88,393

SEC source: 0001562180-24-007502 · primarydocument.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,503

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 · kind: Number of common shares issued pursuant to the time vested Restricted Share Units ("RSUs") granted on 5/1/2024 as part of the stock component of the annual director fees. These RSUs cliff vested on 11/1/24.

SEC source: 0001562180-24-003696 · primarydocument.xml · derivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,063

Underlying: Common Stock · 1,063 shares

Expires 2024-11-01

F1 · derivative.exercise_date: Number of time vested Restricted Share Units ("RSUs") granted on 5/1/2024 as part of the stock component of the annual director fees. The RSUs will cliff vest 6 months from the grant date.

SEC source: 0001209191-24-003342 · doc4.xml · derivative · entry 3

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,593

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.

F3 · shares: Represents second 1/3 of performance restricted stock units granted on February 13, 2022. The remaining 1/3 of the award will vest in 2025. 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.

F3 · derivative.exercise_date: Represents second 1/3 of performance restricted stock units granted on February 13, 2022. The remaining 1/3 of the award will vest in 2025. 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.

F3 · derivative.expiration_date: Represents second 1/3 of performance restricted stock units granted on February 13, 2022. The remaining 1/3 of the award will vest in 2025. 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: 0001209191-24-003342 · doc4.xml · nonDerivative · entry 2

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 89,563

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

SEC source: 0001209191-24-003342 · doc4.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 90,341

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 second 1/3 of performance restricted stock units granted on February 13, 2022. Includes 129 accrued dividend equivalent units.

SEC source: 0001209191-24-003042 · doc4.xml · derivative · entry 5

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,214

Underlying: Southern Company Common Stock · 1,607 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 February 1, 2023. The remaining award will vest 1/3 in 2025 and 1/3 in 2026. 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 February 1, 2023. The remaining award will vest 1/3 in 2025 and 1/3 in 2026. 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 February 1, 2023. The remaining award will vest 1/3 in 2025 and 1/3 in 2026. 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: 0001209191-24-003042 · doc4.xml · nonDerivative · entry 4

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 88,619

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

SEC source: 0001209191-24-003042 · doc4.xml · nonDerivative · entry 3

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 89,373

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 · shares: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on February 1, 2023. The Compensation and Talent Development Committee certified performance on February 7, 2024. Includes 67 accrued dividend equivalent units.

SEC source: 0001209191-24-003042 · doc4.xml · nonDerivative · entry 2

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 87,699

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

SEC source: 0001209191-24-003042 · doc4.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 99,179

F1 · shares: Shares acquired upon vesting of performance share units under Company's Performance Share Program for the 2021-2023 award. The Compensation and Talent Development Committee certified performance on February 7, 2024. Includes accrued dividend equivalent units.

SEC source: 0001209191-24-002907 · doc4.xml · derivative · entry 3

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Southern Company Common Stock · 1,713 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 · shares: Represents final 1/3 of performance restricted stock units granted on February 3, 2021. 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.

F3 · derivative.exercise_date: Represents final 1/3 of performance restricted stock units granted on February 3, 2021. 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.

F3 · derivative.expiration_date: Represents final 1/3 of performance restricted stock units granted on February 3, 2021. 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: 0001209191-24-002907 · doc4.xml · nonDerivative · entry 2

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 73,726

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

SEC source: 0001209191-24-002907 · doc4.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 74,685

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 final 1/3 of performance restricted stock units granted on February 3, 2021. Includes 216 accrued dividend equivalent units.

SEC source: 0001562180-23-007483 · primarydocument.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,440

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 · kind: Number of common shares issued pursuant to the time vested Restricted Share Units ("RSUs") granted on 5/1/2023 as part of the stock component of the annual director fees. These RSUs cliff vested on 11/1/23.

SEC source: 0001209191-23-048378 · doc4.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 72,756

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

SEC source: 0001209191-23-033831 · doc4.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 74,246

SEC source: 0001562180-23-003827 · primarydocument.xml · derivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,215

Underlying: Common Stock · 1,215 shares

Expires 2023-11-01

F1 · derivative.exercise_date: Number of time vested Restricted Share Units ("RSU") granted on 5/1/2023 as part of the stock component of the annual director fees. The units will cliff vest 6 months from the grant date.

SEC source: 0001209191-23-014699 · doc4.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,681

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

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.30 to $62.55, inclusive. The reporting person undertakes to provide to Southern Company, any security holder of Southern Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (2) to this Form 4.

SEC source: 0001209191-23-009787 · doc4.xml · derivative · entry 5

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,186

Underlying: Southern Company Common Stock · 1,594 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 February 13, 2022. The remaining award will vest 1/3 in 2024 and 1/3 in 2025. 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 February 13, 2022. The remaining award will vest 1/3 in 2024 and 1/3 in 2025. 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 February 13, 2022. The remaining award will vest 1/3 in 2024 and 1/3 in 2025. 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: 0001209191-23-009787 · doc4.xml · nonDerivative · entry 4

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 49,592

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

SEC source: 0001209191-23-009787 · doc4.xml · nonDerivative · entry 3

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,339

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 · shares: Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on February 13, 2021. The Compensation Committee and Management Succession Committee certified performance on February 13, 2023. Includes 61 accrued dividend equivalent units.

SEC source: 0001209191-23-009787 · doc4.xml · nonDerivative · entry 2

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 48,684

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

SEC source: 0001209191-23-009787 · doc4.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 55,799

F1 · shares: Shares acquired upon vesting of performance share units under Company's Performance Share Program for the 2020-2022 award. The Compensation and Management Succession Committee certified performance on February 13, 2023. Includes accrued dividend equivalent units.

SEC source: 0001209191-23-009268 · doc4.xml · derivative · entry 3

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Southern Company Common Stock · 1,060 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 · shares: Represents final 1/3 of restricted stock units granted on February 11, 2020. 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.

F3 · derivative.exercise_date: Represents final 1/3 of restricted stock units granted on February 11, 2020. 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.

F3 · derivative.expiration_date: Represents final 1/3 of restricted stock units granted on February 11, 2020. 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: 0001209191-23-009268 · doc4.xml · nonDerivative · entry 2

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,026

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

SEC source: 0001209191-23-009268 · doc4.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,566

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 final 1/3 of restricted stock units granted on February 11, 2020. Includes 136 accrued dividend equivalent units.

SEC source: 0001209191-23-007569 · doc4.xml · derivative · entry 3

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,713

Underlying: Southern Company Common Stock · 1,712 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 · shares: Represents second 1/3 of performance restricted stock units granted on February 3, 2021. The remaining 1/3 of the award will vest in 2024. 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.

F3 · derivative.exercise_date: Represents second 1/3 of performance restricted stock units granted on February 3, 2021. The remaining 1/3 of the award will vest in 2024. 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.

F3 · derivative.expiration_date: Represents second 1/3 of performance restricted stock units granted on February 3, 2021. The remaining 1/3 of the award will vest in 2024. 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: 0001209191-23-007569 · doc4.xml · nonDerivative · entry 2

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 39,370

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

SEC source: 0001209191-23-007569 · doc4.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,292

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 second 1/3 of performance restricted stock units granted on February 3, 2021. Includes 139 accrued dividend equivalent units.

SEC source: 0001209191-22-060350 · doc4.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 38,441

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

SEC source: 0001562180-22-007469 · primarydocument.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,225

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 · kind: Number of common shares issued pursuant to the time vested Restricted Share Units ("RSUs") granted on 5/2/2022 as part of the stock component of the annual director fees. These RSUs cliff vested on 11/2/22.

SEC source: 0001209191-22-055961 · doc4.xml · nonDerivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 39,916

SEC source: 0001562180-22-003638 · primarydocument.xml · derivative · entry 1

DAVIS MARTIN BERNARD · CIK 0001674959 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 935

Underlying: Common Stock · 935 shares

Expires 2022-11-02

F1 · derivative.exercise_date: Number of time vested Restricted Share Units ("RSU") granted on 5/2/2022 as part of the stock component of the annual director fees. The units will cliff vest 6 months from the grant date.

SEC source: 0001209191-22-009926 · doc4.xml · derivative · entry 5

DAVIS MARTIN BERNARD · CIK 0001674959 · EVP and CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,425

Underlying: Southern Company Common Stock · 1,713 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 first 1/3 of performance restricted stock units granted on February 3, 2021. The remaining award will vest 1/3 in 2023 and 1/3 in 2024. 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 February 3, 2021. The remaining award will vest 1/3 in 2023 and 1/3 in 2024. 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 February 3, 2021. The remaining award will vest 1/3 in 2023 and 1/3 in 2024. 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.