Klein Dale E.

SEC source: 0001822966-26-000071 · wk-form4_1780433854.xml · nonDerivative · entry 2

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,362

F2 · shares: The reporting person received a one-time award of 8,681 restricted stock units on May 29, 2026, which will vest quarterly over three years beginning August 29, 2026. Each restricted stock unit represents a right to receive one share of Class A Common Stock upon vesting.

SEC source: 0001822966-26-000071 · wk-form4_1780433854.xml · nonDerivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,681

F1 · shares: The reporting person received an award of 8,681 restricted stock units on May 29, 2026, which vest quarterly in four equal installments over one year, beginning on August 29, 2026. Each restricted stock unit represents the right to receive one share of Class A Common Stock upon vesting.

SEC source: 0001193125-26-139957 · ownership.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 57,353.213

Underlying: Southern Company Common Stock · 464.2047 shares

Expires not disclosed

F1 · security: Represents quarterly director equity retainer paid under the Southern Company 2021 Equity and Incentive Compensation Plan and deferred pursuant to the Deferred Compensation Plan for Outside Directors of The Southern Company (Deferred Compensation Plan). Each deferred stock unit represents the right to receive one share of Southern Company common stock.

F2 · derivative.exercise_date: Deferred stock units are settled in shares of Southern Company common stock on the date(s) following the termination of the reporting person's service on the Board as specified by the reporting person pursuant to the Deferred Compensation Plan. There is no exercise or expiration date.

F2 · derivative.expiration_date: Deferred stock units are settled in shares of Southern Company common stock on the date(s) following the termination of the reporting person's service on the Board as specified by the reporting person pursuant to the Deferred Compensation Plan. There is no exercise or expiration date.

F3 · balance_after: Includes additional deferred stock units acquired through the dividend reinvestment feature of the Deferred Compensation Plan.

SEC source: 0001193125-26-003761 · ownership.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 56,460.4004

Underlying: Southern Company Common Stock · 516.055 shares

Expires not disclosed

F1 · security: Represents quarterly director equity retainer paid under the Southern Company 2021 Equity and Incentive Compensation Plan and deferred pursuant to the Deferred Compensation Plan for Outside Directors of The Southern Company (Deferred Compensation Plan). Each deferred stock unit represents the right to receive one share of Southern Company common stock.

F2 · derivative.exercise_date: Deferred stock units are settled in shares of Southern Company common stock on the date(s) following the termination of the reporting person's service on the Board as specified by the reporting person pursuant to the Deferred Compensation Plan. There is no exercise or expiration date.

F2 · derivative.expiration_date: Deferred stock units are settled in shares of Southern Company common stock on the date(s) following the termination of the reporting person's service on the Board as specified by the reporting person pursuant to the Deferred Compensation Plan. There is no exercise or expiration date.

F3 · balance_after: Includes additional deferred stock units acquired through the dividend reinvestment feature of the Deferred Compensation Plan.

SEC source: 0001193125-25-228252 · ownership.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 55,464.6374

Underlying: Southern Company Common Stock · 448.3122 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: 0000950170-25-049998 · 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: 0000950170-25-001782 · ownership.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 52,770.2409

Underlying: Southern Company Common Stock · 516.2779 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: 0000950170-24-111605 · ownership.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 51,814.084

Underlying: Southern Company Common Stock · 467.6496 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: 0000950170-24-081149 · ownership.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,931.6534

Underlying: Southern Company Common Stock · 551.9481 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: 0001209191-24-005249 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,922.6889

Underlying: Southern Company Common Stock · 597.7496 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: 0001209191-24-000103 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 48,826.5638

Underlying: Southern Company Common Stock · 606.1038 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: 0001209191-23-040678 · 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: 0001209191-23-022254 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,617.1891

Underlying: Southern Company Common Stock · 574.8778 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: 0001209191-23-000238 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 44,577.6052

Underlying: Southern Company Common Stock · 560.1456 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: 0001209191-22-051872 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 43,584.6678

Underlying: Southern Company Common Stock · 588.2353 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: 0001209191-22-040721 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,623.7894

Underlying: Southern Company Common Stock · 546.8964 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: 0001209191-22-030938 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,878

Underlying: Common Stock · 1,878 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 18, 2022 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the May 1,2024.

F1 · price: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 18, 2022 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the May 1,2024.

F1 · derivative.exercise_date: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 18, 2022 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the May 1,2024.

F1 · derivative.expiration_date: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 18, 2022 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the May 1,2024.

SEC source: 0001209191-22-022435 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 41,700.5641

Underlying: Southern Company Common Stock · 539.6654 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: 0001209191-22-000252 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,772.1994

Underlying: Southern Company Common Stock · 583.2604 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: 0001209191-21-058971 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,169.2406

Underlying: Southern Company Common Stock · 647.7733 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: 0001209191-21-044970 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 38,748.7177

Underlying: Southern Company Common Stock · 650.6181 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: 0001209191-21-034166 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,637

Underlying: Common Stock · 1,637 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 19, 2021 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

F1 · price: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 19, 2021 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

F1 · derivative.exercise_date: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 19, 2021 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

F1 · derivative.expiration_date: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 19, 2021 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

SEC source: 0001209191-21-024615 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 37,713.2114

Underlying: Southern Company Common Stock · 641.7455 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: 0001209191-21-000358 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,677.6778

Underlying: Southern Company Common Stock · 651.1476 shares

Expires not disclosed

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: 0001209191-20-053174 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,656.8497

Underlying: Southern Company Common Stock · 732.3325 shares

Expires not disclosed

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: 0001209191-20-040457 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 34,506.6506

Underlying: Southern Company Common Stock · 756.5727 shares

Expires not disclosed

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: 0001209191-20-031775 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,653

Underlying: Common Stock · 1,653 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 20, 2020 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

F1 · price: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 20, 2020 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

F1 · derivative.exercise_date: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 20, 2020 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

F1 · derivative.expiration_date: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 20, 2020 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

SEC source: 0001209191-20-022599 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 33,395.4555

Underlying: Southern Company Common Stock · 797.7663 shares

Expires not disclosed

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: 0001209191-20-000352 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,298.2291

Underlying: Southern Company Common Stock · 627.9435 shares

Expires not disclosed

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: 0001209191-19-051772 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,357.418

Underlying: Southern Company Common Stock · 565.6109 shares

Expires not disclosed

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: 0001209191-19-040501 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,475.2081

Underlying: Southern Company Common Stock · 638.2203 shares

Expires not disclosed

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: 0001209191-19-030803 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,263

Underlying: Common Stock · 1,263 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 15, 2019 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

F1 · price: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 15, 2019 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

F1 · derivative.exercise_date: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 15, 2019 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

F1 · derivative.expiration_date: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 15, 2019 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

SEC source: 0001209191-19-022860 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,165.717

Underlying: Southern Company Common Stock · 680.8014 shares

Expires not disclosed

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: 0001209191-19-001141 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,484.9156

Underlying: Southern Company Common Stock · 796.9035 shares

Expires not disclosed

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: 0001209191-18-053135 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,590.4356

Underlying: Southern Company Common Stock · 802.7523 shares

Expires not disclosed

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: 0001209191-19-000461 · doc4a.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,688.0121

Underlying: Southern Company Common Stock · 810.5604 shares

Expires not disclosed

F1 · shares: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date. Amendment filed to correct the total number of deferred stock units beneficially owned under the Deferred Compensation Plan on October 1, 2018. The price of the derivative security was based on the closing price as of September 28, 2018 rather than October 1, 2018. The correction results in an increase to the total number of deferred stock units beneficially owned.

F2 · derivative.exercise_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F2 · derivative.expiration_date: Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

F3 · balance_after: Includes dividends accrued on March 6, June 6, September 6 and December 6, 2018.

SEC source: 0001209191-18-040472 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,787.6833

Underlying: Southern Company Common Stock · 755.7763 shares

Expires not disclosed

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: 0001209191-18-031570 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,554

Underlying: Common Stock · 1,554 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 16, 2018 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

F1 · price: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 16, 2018 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

F1 · derivative.exercise_date: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 16, 2018 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

F1 · derivative.expiration_date: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 16, 2018 and, at the reporting person's election, will be settled in 100% shares of common stock, 50% in cash and 50% in common stock, or 100% in cash. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

SEC source: 0001209191-18-022949 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,031.907

Underlying: Southern Company Common Stock · 783.6991 shares

Expires not disclosed

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: 0001209191-18-001164 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,001.7822

Underlying: Southern Company Common Stock · 727.802 shares

Expires not disclosed

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: 0001209191-17-054542 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,996.1333

Underlying: Southern Company Common Stock · 712.2507 shares

Expires not disclosed

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: 0001209191-17-042776 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,071.4746

Underlying: Southern Company Common Stock · 730.9942 shares

Expires not disclosed

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: 0001209191-17-034013 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,311

Underlying: Common Stock · 1,311 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 17, 2017 and, at the reporting person's election, will be settled in shares of common stock or 50% in cash and 50% in common stock. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

F1 · price: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 17, 2017 and, at the reporting person's election, will be settled in shares of common stock or 50% in cash and 50% in common stock. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

F1 · derivative.exercise_date: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 17, 2017 and, at the reporting person's election, will be settled in shares of common stock or 50% in cash and 50% in common stock. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

F1 · derivative.expiration_date: Each Stock Unit is the economic equivalent of one share of Pinnacle West common stock. The Stock Units vested on May 17, 2017 and, at the reporting person's election, will be settled in shares of common stock or 50% in cash and 50% in common stock. The reporting person elected to defer settlement until the last business day of the month following the month in which the reporting person separates from service from the Company.

SEC source: 0001209191-17-023988 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,107.8218

Underlying: Southern Company Common Stock · 703.0936 shares

Expires not disclosed

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: 0001209191-17-000543 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,197.3721

Underlying: Southern Company Common Stock · 711.5267 shares

Expires not disclosed

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: 0001209191-16-143509 · doc4.xml · derivative · entry 1

Klein Dale E. · CIK 0001493467 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,321.4402

Underlying: Southern Company Common Stock · 682.2612 shares

Expires not disclosed

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.