SO

SEC source: 0000950170-25-092653 · ownership.xml · derivative · entry 2

Thomas Lizanne · CIK 0001305419 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,645.8418

Underlying: Southern Company Common Stock · 460.455 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-092647 · ownership.xml · derivative · entry 2

Svinicki Kristine L · CIK 0001889194 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,362.1535

Underlying: Southern Company Common Stock · 460.455 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-092642 · ownership.xml · derivative · entry 3

SMITH WILLIAM G JR · CIK 0000909019 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 154,362.6348

Underlying: Southern Company Common Stock · 853.1961 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-092635 · ownership.xml · derivative · entry 2

MEADOR DAVID E · CIK 0001167313 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,670.804

Underlying: Southern Company Common Stock · 785.4821 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-092632 · ownership.xml · derivative · entry 2

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 54,571.7245

Underlying: Southern Company Common Stock · 460.455 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-092625 · ownership.xml · derivative · entry 3

JOHNS JOHN D · CIK 0001189571 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 83,849.1942

Underlying: Southern Company Common Stock · 460.455 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-092621 · ownership.xml · derivative · entry 2

JAMES DONALD M · CIK 0001188417 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 197,009.7629

Underlying: Southern Company Common Stock · 460.455 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-092612 · ownership.xml · derivative · entry 2

Etheredge James O · CIK 0001786092 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 927.1979

Underlying: Southern Company Common Stock · 460.455 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-092616 · ownership.xml · derivative · entry 2

GRAIN DAVID J · CIK 0001249303 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 80,724.3603

Underlying: Southern Company Common Stock · 839.6533 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-092606 · ownership.xml · derivative · entry 3

EARLEY ANTHONY F JR · CIK 0001167316 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,465.4292

Underlying: Southern Company Common Stock · 712.351 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-092598 · ownership.xml · derivative · entry 2

Cooper Shantella E. · CIK 0001698291 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,383.6952

Underlying: Southern Company Common Stock · 785.4821 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-092593 · ownership.xml · derivative · entry 2

Akella Janaki · CIK 0001763595 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,636.9164

Underlying: Southern Company Common Stock · 460.455 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-077872 · ownership.xml · derivative · entry 4

WOMACK CHRISTOPHER C · CIK 0001195423 · Chairman, President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,898

Underlying: Southern Company Common Stock · 6,898 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 May 24, 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 May 24, 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 May 24, 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: 0000950170-25-077872 · ownership.xml · nonDerivative · entry 2

WOMACK CHRISTOPHER C · CIK 0001195423 · Chairman, President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 91,801.9746

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

SEC source: 0000950170-25-077872 · ownership.xml · nonDerivative · entry 1

WOMACK CHRISTOPHER C · CIK 0001195423 · Chairman, President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 95,086.9746

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 May 24, 2023. Includes 457 accrued dividend equivalent units.

SEC source: 0000950170-25-077437 · ownership.xml · nonDerivative · entry 1

Cummiskey Christopher · CIK 0001642170 · EVP

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 22,502.4417

SEC source: 0001193125-26-036071 · ownership.xml · derivative · entry 10

Poroch David P. · CIK 0001616250 · EVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,696

Underlying: Southern Company Common Stock · 57 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.

F8 · shares: Represents restricted stock units granted on February 5, 2025, payable in Southern Company common stock and vest 1/3 per year on the first, second and third anniversary of the grant date. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy income tax requirements.

F8 · derivative.exercise_date: Represents restricted stock units granted on February 5, 2025, payable in Southern Company common stock and vest 1/3 per year on the first, second and third anniversary of the grant date. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy income tax requirements.

F8 · derivative.expiration_date: Represents restricted stock units granted on February 5, 2025, payable in Southern Company common stock and vest 1/3 per year on the first, second and third anniversary of the grant date. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy income tax requirements.

SEC source: 0001193125-26-036071 · ownership.xml · nonDerivative · entry 2

Poroch David P. · CIK 0001616250 · EVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,902

F2 · shares: Represents shares delivered to the Company to cover FICA withholding obligations due because Reporting Person is retirement eligible pursuant to his applicable stock grant documents.

SEC source: 0001193125-26-036071 · ownership.xml · nonDerivative · entry 1

Poroch David P. · CIK 0001616250 · EVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,960

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: Represents shares delivered to the Company to cover FICA withholding obligations due because Reporting Person is retirement eligible pursuant to his applicable stock grant documents. Includes 1 accrued dividend equivalent unit.

SEC source: 0000950170-25-050003 · ownership.xml · derivative · entry 1

Akella Janaki · CIK 0001763595 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,025.3312

Underlying: Southern Company Common Stock · 462.8621 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-050002 · ownership.xml · derivative · entry 1

JAMES DONALD M · CIK 0001188417 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 194,915.0776

Underlying: Southern Company Common Stock · 462.8621 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-050001 · ownership.xml · derivative · entry 1

GRAIN DAVID J · CIK 0001249303 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 79,220.4971

Underlying: Southern Company Common Stock · 844.0427 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-050000 · ownership.xml · derivative · entry 1

Cooper Shantella E. · CIK 0001698291 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,360.4302

Underlying: Southern Company Common Stock · 789.5883 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-049999 · ownership.xml · derivative · entry 1

JOHNS JOHN D · CIK 0001189571 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 82,695.3947

Underlying: Southern Company Common Stock · 462.8621 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-049998 · ownership.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 53,661.3556

Underlying: Southern Company Common Stock · 462.8621 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-049997 · ownership.xml · derivative · entry 1

MEADOR DAVID E · CIK 0001167313 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,836.3877

Underlying: Southern Company Common Stock · 789.5883 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-049996 · ownership.xml · derivative · entry 1

Thomas Lizanne · CIK 0001305419 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,142.2724

Underlying: Southern Company Common Stock · 462.8621 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-049995 · ownership.xml · derivative · entry 1

SMITH WILLIAM G JR · CIK 0000909019 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 152,233.0682

Underlying: Southern Company Common Stock · 857.6563 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-049994 · ownership.xml · derivative · entry 1

Svinicki Kristine L · CIK 0001889194 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,827.6843

Underlying: Southern Company Common Stock · 462.8621 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-049993 · ownership.xml · derivative · entry 1

Clark Henry A III · CIK 0001474932 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 71,054.6158

Underlying: Southern Company Common Stock · 789.5883 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-049992 · ownership.xml · derivative · entry 1

EARLEY ANTHONY F JR · CIK 0001167316 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,522.3223

Underlying: Southern Company Common Stock · 716.0749 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-049991 · ownership.xml · derivative · entry 1

Etheredge James O · CIK 0001786092 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 462.8621

Underlying: Southern Company Common Stock · 462.8621 shares

Expires not disclosed

F1 · security: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F1 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

SEC source: 0000950170-25-048195 · ownership.xml · nonDerivative · entry 1

Connally Stan W · CIK 0001498337 · EVP & COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 149,419

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $92 to $92.61, 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 to this Form 4.

SEC source: 0000950170-25-036876 · ownership.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 106,819

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $93 to $93.27, 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 to this Form 4.

SEC source: 0000950170-25-036354 · ownership.xml · derivative · entry 4

Drake Sloane N · CIK 0001971188 · EVP & CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,275

Underlying: Southern Company Common Stock · 1,274 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 March 8, 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 March 8, 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 March 8, 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.underlying_shares: Represents second 1/3 of performance restricted stock units granted on March 8, 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: 0000950170-25-036354 · ownership.xml · nonDerivative · entry 2

Drake Sloane N · CIK 0001971188 · EVP & CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,457

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

SEC source: 0000950170-25-036354 · ownership.xml · nonDerivative · entry 1

Drake Sloane N · CIK 0001971188 · EVP & CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,070

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 March 8, 2023. Includes 98 accrued dividend equivalent units.

SEC source: 0000950170-25-031369 · ownership.xml · nonDerivative · entry 1

WOMACK CHRISTOPHER C · CIK 0001195423 · Chairman, President & CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 87,720.7006

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $90 to $90.35, 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 to this Form 4.

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: 0000950170-25-027817 · ownership.xml · nonDerivative · entry 1

WOMACK CHRISTOPHER C · CIK 0001195423 · Chairman, President & CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 112,127.7006

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $90 to $90.01, 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 to this Form 4.

SEC source: 0000950170-25-024113 · ownership.xml · nonDerivative · entry 1

Cummiskey Christopher · CIK 0001642170 · EVP

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 34,837.4417

SEC source: 0000950170-25-022181 · ownership.xml · derivative · entry 4

Kerr, II James Y · CIK 0001601624 · Chairman, President & CEO, GAS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Southern Company Common Stock · 2,749 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.

F3 · derivative.underlying_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.

SEC source: 0000950170-25-022181 · ownership.xml · nonDerivative · entry 2

Kerr, II James Y · CIK 0001601624 · Chairman, President & CEO, GAS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 171,052

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

SEC source: 0000950170-25-022181 · ownership.xml · nonDerivative · entry 1

Kerr, II James Y · CIK 0001601624 · Chairman, President & CEO, GAS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 172,428

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 331 accrued dividend equivalent units.

SEC source: 0000950170-25-022182 · ownership.xml · derivative · entry 4

WOMACK CHRISTOPHER C · CIK 0001195423 · Chairman, President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Southern Company Common Stock · 3,726 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.

F3 · derivative.underlying_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.

SEC source: 0000950170-25-022182 · ownership.xml · nonDerivative · entry 2

WOMACK CHRISTOPHER C · CIK 0001195423 · Chairman, President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 113,720.7006

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

SEC source: 0000950170-25-022182 · ownership.xml · nonDerivative · entry 1

WOMACK CHRISTOPHER C · CIK 0001195423 · Chairman, President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 115,584.7006

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 448 accrued dividend equivalent units.

SEC source: 0000950170-25-022180 · ownership.xml · derivative · entry 4

Cummiskey Christopher · CIK 0001642170 · EVP

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Southern Company Common Stock · 1,524 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.

F3 · derivative.underlying_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.

SEC source: 0000950170-25-022180 · ownership.xml · nonDerivative · entry 2

Cummiskey Christopher · CIK 0001642170 · EVP

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,781.4417

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

SEC source: 0000950170-25-022180 · ownership.xml · nonDerivative · entry 1

Cummiskey Christopher · CIK 0001642170 · EVP

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,545.4417

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 final 1/3 of performance restricted stock units granted on February 13, 2022. Includes 184 accrued dividend equivalent units.