SO

SEC source: 0001209191-23-058288 · doc4.xml · nonDerivative · entry 1

Kuczynski Stephen E · CIK 0001524757 · CEO, Southern Nuclear

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 106,284.1563

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

SEC source: 0001209191-23-055788 · doc4.xml · derivative · entry 5

Poroch David P. · CIK 0001616250 · Comptroller

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 10,099

Underlying: Southern Company Common Stock · 10,000 shares

Expires 2024-02-10

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.

SEC source: 0001209191-23-055788 · doc4.xml · nonDerivative · entry 2

Poroch David P. · CIK 0001616250 · Comptroller

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 28,691

SEC source: 0001209191-23-055788 · doc4.xml · nonDerivative · entry 1

Poroch David P. · CIK 0001616250 · Comptroller

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 38,691

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.

SEC source: 0001209191-23-055030 · doc4.xml · nonDerivative · entry 1

Kuczynski Stephen E · CIK 0001524757 · CEO, Southern Nuclear

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,284.1563

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

SEC source: 0001209191-23-052625 · doc4.xml · nonDerivative · entry 1

Kuczynski Stephen E · CIK 0001524757 · CEO, Southern Nuclear

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 116,284.1563

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

SEC source: 0001209191-23-051120 · doc4.xml · derivative · entry 1

WOOD E JENNER III · CIK 0001015221 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 58,802.9411

Underlying: Southern Company Common Stock · 618.047 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: 0001209191-23-051118 · doc4.xml · derivative · entry 1

Thomas Lizanne · CIK 0001305419 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,768.8695

Underlying: Southern Company Common Stock · 618.047 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: 0001209191-23-051117 · doc4.xml · derivative · entry 1

Svinicki Kristine L · CIK 0001889194 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,262.0975

Underlying: Southern Company Common Stock · 618.047 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: 0001209191-23-051116 · doc4.xml · derivative · entry 1

SMITH WILLIAM G JR · CIK 0000909019 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 138,540.6982

Underlying: Southern Company Common Stock · 1,120.2101 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: 0001209191-23-051115 · doc4.xml · derivative · entry 1

Moniz Ernest J · CIK 0001265177 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,390.4432

Underlying: Southern Company Common Stock · 618.047 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: 0001209191-23-051113 · doc4.xml · derivative · entry 1

MEADOR DAVID E · CIK 0001167313 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,768.8695

Underlying: Southern Company Common Stock · 618.047 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: 0001209191-23-051111 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 47,757.8185

Underlying: Southern Company Common Stock · 618.047 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: 0001209191-23-051109 · doc4.xml · derivative · entry 1

JOHNS JOHN D · CIK 0001189571 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 75,277.8136

Underlying: Southern Company Common Stock · 618.047 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: 0001209191-23-051107 · doc4.xml · derivative · entry 1

JAMES DONALD M · CIK 0001188417 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 181,645.5545

Underlying: Southern Company Common Stock · 618.047 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: 0001209191-23-051105 · doc4.xml · derivative · entry 1

GRAIN DAVID J · CIK 0001249303 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 69,301.1555

Underlying: Southern Company Common Stock · 1,158.8381 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: 0001209191-23-051103 · doc4.xml · derivative · entry 1

EARLEY ANTHONY F JR · CIK 0001167316 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,036.7959

Underlying: Southern Company Common Stock · 1,019.7775 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: 0001209191-23-051102 · doc4.xml · derivative · entry 1

Clark Henry A III · CIK 0001474932 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 62,052.129

Underlying: Southern Company Common Stock · 1,042.9543 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: 0001209191-23-051101 · doc4.xml · derivative · entry 1

Akella Janaki · CIK 0001763595 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,840.4052

Underlying: Southern Company Common Stock · 618.047 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: 0001209191-23-049116 · doc4.xml · nonDerivative · entry 1

Kuczynski Stephen E · CIK 0001524757 · CEO, Southern Nuclear

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 121,284.1563

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

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: 0001209191-23-047888 · doc4.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 76,409

F1 · security: Shares were a charitable donation to a donor advised fund.

SEC source: 0001209191-23-047857 · doc4.xml · nonDerivative · entry 1

Cummiskey Christopher · CIK 0001642170 · EVP & CCCS Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 22,512.4417

SEC source: 0001209191-23-045449 · doc4.xml · nonDerivative · entry 1

Kuczynski Stephen E · CIK 0001524757 · CEO, Southern Nuclear

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 126,284.1563

SEC source: 0001209191-23-043219 · doc4.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 98,659

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $72.50 to $72.76, 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 (1) to this Form 4.

SEC source: 0001209191-23-042036 · doc4.xml · nonDerivative · entry 1

Kuczynski Stephen E · CIK 0001524757 · CEO, Southern Nuclear

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 131,284.1563

SEC source: 0001209191-23-040693 · doc4.xml · derivative · entry 1

Akella Janaki · CIK 0001763595 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,222.3582

Underlying: Southern Company Common Stock · 569.395 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: 0001209191-23-040692 · doc4.xml · derivative · entry 1

Clark Henry A III · CIK 0001474932 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 60,371.2894

Underlying: Southern Company Common Stock · 960.8541 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: 0001209191-23-040690 · doc4.xml · derivative · entry 1

EARLEY ANTHONY F JR · CIK 0001167316 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,807.729

Underlying: Southern Company Common Stock · 939.5018 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: 0001209191-23-040686 · doc4.xml · derivative · entry 1

Honorable Colette D · CIK 0001827550 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,984.8278

Underlying: Southern Company Common Stock · 765.1246 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: 0001209191-23-040685 · doc4.xml · derivative · entry 1

JAMES DONALD M · CIK 0001188417 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 179,134.7629

Underlying: Southern Company Common Stock · 569.395 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: 0001209191-23-040683 · doc4.xml · derivative · entry 1

JOHNS JOHN D · CIK 0001189571 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 73,879.1565

Underlying: Southern Company Common Stock · 569.395 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: 0001209191-23-040678 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,646.8986

Underlying: Southern Company Common Stock · 569.395 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: 0001209191-23-040677 · doc4.xml · derivative · entry 1

MEADOR DAVID E · CIK 0001167313 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,138.79

Underlying: Southern Company Common Stock · 1,138.79 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: 0001209191-23-040676 · doc4.xml · derivative · entry 1

Moniz Ernest J · CIK 0001265177 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,597.0312

Underlying: Southern Company Common Stock · 569.395 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: 0001209191-23-040675 · doc4.xml · derivative · entry 1

SMITH WILLIAM G JR · CIK 0000909019 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 135,983.6792

Underlying: Southern Company Common Stock · 1,032.0285 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: 0001209191-23-040674 · doc4.xml · derivative · entry 1

Svinicki Kristine L · CIK 0001889194 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,595.4943

Underlying: Southern Company Common Stock · 569.395 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: 0001209191-23-040673 · doc4.xml · derivative · entry 1

Thomas Lizanne · CIK 0001305419 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,138.79

Underlying: Southern Company Common Stock · 1,138.79 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: 0001209191-23-040672 · doc4.xml · derivative · entry 1

WOOD E JENNER III · CIK 0001015221 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 57,576.5382

Underlying: Southern Company Common Stock · 569.395 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: 0001209191-23-041016 · doc4.xml · derivative · entry 1

GRAIN DAVID J · CIK 0001249303 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 67,429.851

Underlying: Southern Company Common Stock · 1,067.6157 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: 0001209191-23-036792 · doc4.xml · nonDerivative · entry 1

Kuczynski Stephen E · CIK 0001524757 · CEO, Southern Nuclear

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 136,284.1563

SEC source: 0001209191-23-036340 · doc4.xml · nonDerivative · entry 1

FANNING THOMAS A · CIK 0001227464 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 844,238.797

F1 · security: Shares sold pursuant to a 10b5-1 trading plan entered into on February 24, 2023 for estate, financial and tax planning purposes. Plan allows for the sale of up to 150,000 shares from 4/10/2023 through 6/12/2023. After completion of the transactions, Mr. Fanning will continue to hold shares of Southern common stock that significantly exceed his share ownership requirements.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $70.38 to $71.14, 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: 0001209191-23-034809 · doc4.xml · derivative · entry 5

Poroch David P. · CIK 0001616250 · Comptroller

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 20,099

Underlying: Southern Company Common Stock · 10,000 shares

Expires 2024-02-10

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.

SEC source: 0001209191-23-034809 · doc4.xml · nonDerivative · entry 2

Poroch David P. · CIK 0001616250 · Comptroller

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 28,691

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $70.00 to $70.14, 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 (1) to this Form 4.

SEC source: 0001209191-23-034809 · doc4.xml · nonDerivative · entry 1

Poroch David P. · CIK 0001616250 · Comptroller

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 38,691

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.

SEC source: 0001209191-23-034807 · doc4.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 118,659

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $69.34 to $70.16, 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 (1) to this Form 4.

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: 0001209191-23-028808 · doc4.xml · nonDerivative · entry 1

FANNING THOMAS A · CIK 0001227464 · CEO & Chairman

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 847,591.797

F1 · security: Shares sold pursuant to a 10b5-1 trading plan entered into on February 24, 2023 for estate, financial and tax planning purposes. Plan allows for the sale of up to 150,000 shares from 4/10/2023 through 6/12/2023. After completion of the transactions, Mr. Fanning will continue to hold shares of Southern common stock that significantly exceed his share ownership requirements.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $74.96 to $75.47, 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: 0001209191-23-028805 · doc4.xml · nonDerivative · entry 1

Kuczynski Stephen E · CIK 0001524757 · CEO, Southern Nuclear

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 141,284.1563

SEC source: 0001209191-23-028804 · doc4.xml · derivative · entry 3

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Southern Company Common Stock · 27,426 shares

Expires 2024-02-10

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

F1 · security: Options were exercised and shares were sold.