K. Jon Taylor

SEC source: 0001031296-26-000062 · form4.xml · nonDerivative · entry 1

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 119,552.374

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $50.925 to $50.955, inclusive. The reporting person undertakes to provide to FirstEnergy Corp. (the "Company"), any security holder of the 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 ranges set forth in this footnote.

SEC source: 0001031296-26-000056 · form4.xml · derivative · entry 9

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,344

Underlying: Common Stock · 22,344 shares

Expires not disclosed

F10 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of the Company's common stock.

F11 · derivative.exercise_date: The phantom stock becomes payable upon the reporting person's death, disability or termination of employment with the Company.

F11 · derivative.expiration_date: The phantom stock becomes payable upon the reporting person's death, disability or termination of employment with the Company.

SEC source: 0001031296-26-000056 · form4.xml · derivative · entry 8

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 66,927.69 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.

F9 · derivative.exercise_price: RSUs convert into the Company's common stock on a one-for-one basis.

F2 · derivative.exercise_date: Represents the vesting of performance-adjusted restricted stock units ("RSUs"), each of which previously represented a contingent right to receive an RSU award payable 2/3 in shares of common stock of the Company ("Share-Based RSUs") and 1/3 in cash ("Cash-Based RSUs") following the vesting date. The satisfaction of the performance goals for the RSUs were certified by the Company's Board of Directors on February 11, 2026, as previously reported on a Form 4 filed on February 13, 2026, and the RSUs, which had remained subject to a continued service requirement, vested on March 1, 2026.

F2 · derivative.expiration_date: Represents the vesting of performance-adjusted restricted stock units ("RSUs"), each of which previously represented a contingent right to receive an RSU award payable 2/3 in shares of common stock of the Company ("Share-Based RSUs") and 1/3 in cash ("Cash-Based RSUs") following the vesting date. The satisfaction of the performance goals for the RSUs were certified by the Company's Board of Directors on February 11, 2026, as previously reported on a Form 4 filed on February 13, 2026, and the RSUs, which had remained subject to a continued service requirement, vested on March 1, 2026.

SEC source: 0001031296-26-000056 · form4.xml · nonDerivative · entry 6

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 146,352.374

F7 · shares: In connection with the vesting of the Share-Based RSUs on March 1, 2026, the reporting person's receipt of 22,344 shares of the Company's common stock was deferred, resulting in the reporting person receiving instead 22,344 shares of phantom stock pursuant to the Company's deferred compensation plan. The reporting person is therefore reporting the disposition of 22,344 shares of common stock in exchange for an equal number of shares of phantom stock.

SEC source: 0001031296-26-000056 · form4.xml · nonDerivative · entry 5

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 168,696.374

F6 · shares: On March 1, 2026, the Cash-Based RSUs were settled based on an average of the Company's high and low stock price on February 27, 2026, net of applicable tax withholding obligations.

SEC source: 0001031296-26-000056 · form4.xml · nonDerivative · entry 4

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 190,937.064

F5 · shares: Represents the number of shares withheld to satisfy the reporting person's tax withholding obligation upon the vesting of 14,522 shares of restricted common stock granted pursuant to the terms of the Restricted Stock Award Agreement, dated March 1, 2023, between the Company and the reporting person.

SEC source: 0001031296-26-000056 · form4.xml · nonDerivative · entry 3

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 196,648.064

F4 · shares: Represents shares of common stock of the Company withheld to cover tax obligations associated with the vesting on March 1, 2026, of the Share-Based RSUs described in footnote 2, which transaction is exempt under Rule 16b-3.

SEC source: 0001031296-26-000056 · form4.xml · nonDerivative · entry 2

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 208,128.064

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.

F2 · shares: Represents the vesting of performance-adjusted restricted stock units ("RSUs"), each of which previously represented a contingent right to receive an RSU award payable 2/3 in shares of common stock of the Company ("Share-Based RSUs") and 1/3 in cash ("Cash-Based RSUs") following the vesting date. The satisfaction of the performance goals for the RSUs were certified by the Company's Board of Directors on February 11, 2026, as previously reported on a Form 4 filed on February 13, 2026, and the RSUs, which had remained subject to a continued service requirement, vested on March 1, 2026.

F3 · price: The RSUs converted into shares of the Company's common stock on a one-for-one basis under the FirstEnergy Corp. 2020 Incentive Compensation Plan.

SEC source: 0001031296-26-000056 · form4.xml · nonDerivative · entry 1

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 141,200.374

F1 · shares: These securities are time-based restricted stock units, each representing a contingent right to receive one share of common stock, par value $0.10 per share, of FirstEnergy Corp. (the "Company"). The time-based restricted stock units were granted under the Company's 2020 Incentive Compensation Plan and will vest in full on March 1, 2029.

SEC source: 0001031296-26-000034 · form4.xml · derivative · entry 3

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 66,347.313

Underlying: Common Stock · 66,347.313 shares

Expires not disclosed

F3 · derivative.exercise_price: Represents performance-adjusted restricted stock units ("RSUs") granted March 1, 2023, each of which represents a contingent right to receive an award payable 2/3 in Company common stock and 1/3 in cash following the vesting date. This Form 4 is being filed to report the satisfaction of the performance goals for the RSUs, as certified by the Company's Board of Directors on February 11, 2026. As a result, these RSUs will vest on March 1, 2026, generally subject to the reporting person's continued service.

F3 · derivative.exercise_date: Represents performance-adjusted restricted stock units ("RSUs") granted March 1, 2023, each of which represents a contingent right to receive an award payable 2/3 in Company common stock and 1/3 in cash following the vesting date. This Form 4 is being filed to report the satisfaction of the performance goals for the RSUs, as certified by the Company's Board of Directors on February 11, 2026. As a result, these RSUs will vest on March 1, 2026, generally subject to the reporting person's continued service.

F3 · derivative.expiration_date: Represents performance-adjusted restricted stock units ("RSUs") granted March 1, 2023, each of which represents a contingent right to receive an award payable 2/3 in Company common stock and 1/3 in cash following the vesting date. This Form 4 is being filed to report the satisfaction of the performance goals for the RSUs, as certified by the Company's Board of Directors on February 11, 2026. As a result, these RSUs will vest on March 1, 2026, generally subject to the reporting person's continued service.

SEC source: 0001127602-25-013876 · form4.xml · nonDerivative · entry 1

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 99,919.008

F1 · balance_after: Balance includes shares acquired through dividend reinvestments.

SEC source: 0001127602-25-016652 · form4.xml · nonDerivative · entry 1

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 129,314.528

F1 · shares: These securities are restricted stock units ("RSUs"), each representing a contingent right to receive one share of common stock, par value $0.10 per share, of FirstEnergy Corp. (the "Company"). The RSUs were granted under the Company's 2020 Incentive Compensation Plan and will vest in full on March 1, 2028. This transaction is being reported late due to an inadvertent administrative error and not any error of the Reporting Person.

F2 · balance_after: Balance includes dividends accrued on time-based equity awards.

SEC source: 0001127602-25-008125 · form4.xml · derivative · entry 8

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,730

Underlying: Common Stock · 13,730 shares

Expires not disclosed

F9 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of the Company's common stock.

F10 · derivative.exercise_date: The phantom stock becomes payable upon the reporting person's death, disability or termination of employment with the Company.

F10 · derivative.expiration_date: The phantom stock becomes payable upon the reporting person's death, disability or termination of employment with the Company.

SEC source: 0001127602-25-008125 · form4.xml · derivative · entry 7

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 41,105.846 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 · derivative.exercise_price: Share-Based RSUs convert into the Company's common stock on a one-for-one basis.

F1 · derivative.exercise_date: Represents the vesting of performance-adjusted restricted stock units ("RSUs"), each of which previously represented a contingent right to receive an RSU award payable 2/3 in shares of common stock of FirstEnergy Corp. (the "Company") ("Share-Based RSUs") and 1/3 in cash ("Cash-Based RSUs") following the vesting date. The satisfaction of the performance goals for the RSUs were certified by the Company's Board of Directors on February 5, 2025, as previously reported on a Form 4 filed on February 7, 2025, and the RSUs, which had remained subject to a continued service requirement, vested on March 1, 2025.

F1 · derivative.expiration_date: Represents the vesting of performance-adjusted restricted stock units ("RSUs"), each of which previously represented a contingent right to receive an RSU award payable 2/3 in shares of common stock of FirstEnergy Corp. (the "Company") ("Share-Based RSUs") and 1/3 in cash ("Cash-Based RSUs") following the vesting date. The satisfaction of the performance goals for the RSUs were certified by the Company's Board of Directors on February 5, 2025, as previously reported on a Form 4 filed on February 7, 2025, and the RSUs, which had remained subject to a continued service requirement, vested on March 1, 2025.

SEC source: 0001127602-25-008125 · form4.xml · nonDerivative · entry 5

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,919.008

F6 · shares: In connection with the vesting of the Share-Settled RSUs on March 1, 2025, the reporting person's receipt of 13,730 shares of the Company's common stock was deferred, resulting in the reporting person receiving instead 13,730 shares of phantom stock pursuant to the Company's deferred compensation plan. The reporting person is therefore reporting the disposition of 13,730 shares of common stock in exchange for an equal number of shares of phantom stock.

SEC source: 0001127602-25-008125 · form4.xml · nonDerivative · entry 4

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 125,649.008

F5 · shares: On March 1, 2025, the Cash-Based RSUs were settled based on an average of the Company's high and low stock price, net of applicable tax withholding obligations

SEC source: 0001127602-25-008125 · form4.xml · nonDerivative · entry 3

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 139,295.854

F4 · shares: Represents shares of common stock of the Company withheld to cover tax obligations associated with the vesting of the RSUs and restricted stock award described in footnotes 1 and 3, respectively, which transaction is exempt under Rule 16b-3.

SEC source: 0001127602-25-008125 · form4.xml · nonDerivative · entry 2

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 150,704.854

F3 · shares: Represents the vesting of a time-based restricted stock award granted to the reporting person on March 1, 2023, which vested 25% on March 1, 2025.

SEC source: 0001127602-25-008125 · form4.xml · nonDerivative · entry 1

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 136,737.854

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 the vesting of performance-adjusted restricted stock units ("RSUs"), each of which previously represented a contingent right to receive an RSU award payable 2/3 in shares of common stock of FirstEnergy Corp. (the "Company") ("Share-Based RSUs") and 1/3 in cash ("Cash-Based RSUs") following the vesting date. The satisfaction of the performance goals for the RSUs were certified by the Company's Board of Directors on February 5, 2025, as previously reported on a Form 4 filed on February 7, 2025, and the RSUs, which had remained subject to a continued service requirement, vested on March 1, 2025.

F2 · price: The RSUs converted into shares of the Company's common stock on a one-for-one basis under the FirstEnergy Corp. 2020 Incentive Compensation Plan.

SEC source: 0001127602-25-003689 · form4.xml · derivative · entry 3

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,654.509

Underlying: Common Stock · 40,654.509 shares

Expires not disclosed

F3 · derivative.exercise_price: Represents performance-adjusted restricted stock units ("RSUs"), each of which represents a contingent right to receive an award payable 2/3 in Company common stock and 1/3 in cash following the vesting date. This Form 4 is being filed to report the satisfaction of the performance goals for the RSUs, as certified by the Company's Board of Directors on February 5, 2025. Subsequent to this certification, these RSUs will vest on March 1, 2024, generally subject to the reporting person's continued service.

F3 · derivative.exercise_date: Represents performance-adjusted restricted stock units ("RSUs"), each of which represents a contingent right to receive an award payable 2/3 in Company common stock and 1/3 in cash following the vesting date. This Form 4 is being filed to report the satisfaction of the performance goals for the RSUs, as certified by the Company's Board of Directors on February 5, 2025. Subsequent to this certification, these RSUs will vest on March 1, 2024, generally subject to the reporting person's continued service.

F3 · derivative.expiration_date: Represents performance-adjusted restricted stock units ("RSUs"), each of which represents a contingent right to receive an award payable 2/3 in Company common stock and 1/3 in cash following the vesting date. This Form 4 is being filed to report the satisfaction of the performance goals for the RSUs, as certified by the Company's Board of Directors on February 5, 2025. Subsequent to this certification, these RSUs will vest on March 1, 2024, generally subject to the reporting person's continued service.

SEC source: 0001127602-24-008729 · form4.xml · derivative · entry 6

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,742

Underlying: Common Stock · 35,742 shares

Expires not disclosed

F6 · derivative.exercise_price: Each share of phantom stock is the economic equivalent of one share of common stock and is settled in cash. The shares of phantom stock are payable upon the reporting person's retirement or termination of employment under the FirstEnergy Corp. Amended and Restated Executive Deferred Compensation Plan, as amended.

F6 · derivative.exercise_date: Each share of phantom stock is the economic equivalent of one share of common stock and is settled in cash. The shares of phantom stock are payable upon the reporting person's retirement or termination of employment under the FirstEnergy Corp. Amended and Restated Executive Deferred Compensation Plan, as amended.

F6 · derivative.expiration_date: Each share of phantom stock is the economic equivalent of one share of common stock and is settled in cash. The shares of phantom stock are payable upon the reporting person's retirement or termination of employment under the FirstEnergy Corp. Amended and Restated Executive Deferred Compensation Plan, as amended.

SEC source: 0001127602-24-008729 · form4.xml · derivative · entry 5

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 107,009.961 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.

F1 · derivative.exercise_price: This Form 4 is being filed to report the vesting, and automatic withholding for tax purposes, of performance-adjusted restricted stock units ("RSUs"), each of which represents a contingent right to receive an award payable 2/3 in shares of common stock of FirstEnergy Corp. (the "Company") ("Share-Based RSUs") and 1/3 in cash ("Cash-Based RSUs") following the vesting date. The satisfaction of the performance goals for the RSUs were certified by the Company's Board of Directors on February 7, 2024, as previously reported on a Form 4 filed on February 9, 2024, and the RSUs vested on March 1, 2024.

F1 · derivative.exercise_date: This Form 4 is being filed to report the vesting, and automatic withholding for tax purposes, of performance-adjusted restricted stock units ("RSUs"), each of which represents a contingent right to receive an award payable 2/3 in shares of common stock of FirstEnergy Corp. (the "Company") ("Share-Based RSUs") and 1/3 in cash ("Cash-Based RSUs") following the vesting date. The satisfaction of the performance goals for the RSUs were certified by the Company's Board of Directors on February 7, 2024, as previously reported on a Form 4 filed on February 9, 2024, and the RSUs vested on March 1, 2024.

F1 · derivative.expiration_date: This Form 4 is being filed to report the vesting, and automatic withholding for tax purposes, of performance-adjusted restricted stock units ("RSUs"), each of which represents a contingent right to receive an award payable 2/3 in shares of common stock of FirstEnergy Corp. (the "Company") ("Share-Based RSUs") and 1/3 in cash ("Cash-Based RSUs") following the vesting date. The satisfaction of the performance goals for the RSUs were certified by the Company's Board of Directors on February 7, 2024, as previously reported on a Form 4 filed on February 9, 2024, and the RSUs vested on March 1, 2024.

SEC source: 0001127602-24-008729 · form4.xml · nonDerivative · entry 3

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 127,453.775

F4 · shares: Represents the deemed disposition to the Company of the common stock underlying the Cash-Based RSUs, net of applicable withholding obligations described in footnote 1, which transaction is exempt under Rule 16b-3.

SEC source: 0001127602-24-008729 · form4.xml · nonDerivative · entry 2

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 146,343.075

F3 · shares: Represents shares of common stock of the Company automatically withheld to cover tax obligations associated with the vesting of the RSUs described in footnote 1, which transaction is exempt under Rule 16b-3.

SEC source: 0001127602-24-008729 · form4.xml · nonDerivative · entry 1

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 182,187.736

F1 · shares: This Form 4 is being filed to report the vesting, and automatic withholding for tax purposes, of performance-adjusted restricted stock units ("RSUs"), each of which represents a contingent right to receive an award payable 2/3 in shares of common stock of FirstEnergy Corp. (the "Company") ("Share-Based RSUs") and 1/3 in cash ("Cash-Based RSUs") following the vesting date. The satisfaction of the performance goals for the RSUs were certified by the Company's Board of Directors on February 7, 2024, as previously reported on a Form 4 filed on February 9, 2024, and the RSUs vested on March 1, 2024.

F2 · price: The RSUs were granted under the FirstEnergy Corp. 2020 Incentive Compensation Plan and, therefore, the reporting person paid no price for the RSUs.

SEC source: 0001127602-24-004296 · form4.xml · derivative · entry 3

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 105,814.21

Underlying: Common Stock · 105,814.21 shares

Expires not disclosed

F3 · derivative.exercise_price: Represents performance-adjusted restricted stock units ("RSUs"), each of which represents a contingent right to receive an award payable 2/3 in Company common stock and 1/3 in cash following the vesting date. This Form 4 is being filed to report the satisfaction of the performance goals for the RSUs, as certified by the Company's Board of Directors on February 7, 2024. As a result, these RSUs will vest on March 1, 2024, generally subject to the reporting person's continued service.

F3 · derivative.exercise_date: Represents performance-adjusted restricted stock units ("RSUs"), each of which represents a contingent right to receive an award payable 2/3 in Company common stock and 1/3 in cash following the vesting date. This Form 4 is being filed to report the satisfaction of the performance goals for the RSUs, as certified by the Company's Board of Directors on February 7, 2024. As a result, these RSUs will vest on March 1, 2024, generally subject to the reporting person's continued service.

F3 · derivative.expiration_date: Represents performance-adjusted restricted stock units ("RSUs"), each of which represents a contingent right to receive an award payable 2/3 in Company common stock and 1/3 in cash following the vesting date. This Form 4 is being filed to report the satisfaction of the performance goals for the RSUs, as certified by the Company's Board of Directors on February 7, 2024. As a result, these RSUs will vest on March 1, 2024, generally subject to the reporting person's continued service.

SEC source: 0001127602-23-008976 · form4.xml · derivative · entry 7

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 12,113 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.

F7 · derivative.exercise_price: 1 for 1

F5 · price: 1 for 1. The 15PSUS20 award was previously granted for $0.00 under the FirstEnergy Corp. 2015 Incentive Compensation Plan.

F6 · derivative.exercise_date: Represents the vesting of the 15PSUS20 award. The award vested on March 1, 2023. The shares coded "F" were automatically withheld to cover tax obligations associated with the payout. Amounts also include dividend reinvestments.

F6 · derivative.expiration_date: Represents the vesting of the 15PSUS20 award. The award vested on March 1, 2023. The shares coded "F" were automatically withheld to cover tax obligations associated with the payout. Amounts also include dividend reinvestments.

SEC source: 0001127602-23-008976 · form4.xml · derivative · entry 6

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,846

Underlying: Common Stock · 4,846 shares

Expires not disclosed

F7 · derivative.exercise_price: 1 for 1

F5 · price: 1 for 1. The 15PSUS20 award was previously granted for $0.00 under the FirstEnergy Corp. 2015 Incentive Compensation Plan.

F8 · derivative.exercise_date: This holding reflects phantom stock payable in cash upon retirement or other termination of employment under the FirstEnergy Corp. Executive Deferred Compensation Plan. Each share of phantom stock is the economic equivalent of one share of common stock.

F8 · derivative.expiration_date: This holding reflects phantom stock payable in cash upon retirement or other termination of employment under the FirstEnergy Corp. Executive Deferred Compensation Plan. Each share of phantom stock is the economic equivalent of one share of common stock.

SEC source: 0001127602-23-008976 · form4.xml · nonDerivative · entry 5

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,671.775

F6 · shares: Represents the vesting of the 15PSUS20 award. The award vested on March 1, 2023. The shares coded "F" were automatically withheld to cover tax obligations associated with the payout. Amounts also include dividend reinvestments.

F3 · balance_after: Balance includes restricted stock and shares acquired through dividend reinvestments.

SEC source: 0001127602-23-008976 · form4.xml · nonDerivative · entry 4

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,410.775

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.

F6 · shares: Represents the vesting of the 15PSUS20 award. The award vested on March 1, 2023. The shares coded "F" were automatically withheld to cover tax obligations associated with the payout. Amounts also include dividend reinvestments.

F5 · price: 1 for 1. The 15PSUS20 award was previously granted for $0.00 under the FirstEnergy Corp. 2015 Incentive Compensation Plan.

F3 · balance_after: Balance includes restricted stock and shares acquired through dividend reinvestments.

SEC source: 0001127602-23-008976 · form4.xml · nonDerivative · entry 3

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,177.775

F4 · shares: This transaction represents the deferral of the 15PSUS20 award. As a result, the reporting person is reporting the disposition of common stock which is described below.

F5 · price: 1 for 1. The 15PSUS20 award was previously granted for $0.00 under the FirstEnergy Corp. 2015 Incentive Compensation Plan.

F3 · balance_after: Balance includes restricted stock and shares acquired through dividend reinvestments.

SEC source: 0001127602-23-008976 · form4.xml · nonDerivative · entry 2

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 80,023.775

F2 · shares: Restricted stock was granted pursuant to an award agreement effective on March 1, 2023.

F3 · balance_after: Balance includes restricted stock and shares acquired through dividend reinvestments.

SEC source: 0001127602-23-004998 · form4.xml · derivative · entry 4

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,992.473

Underlying: Common Stock · 11,992.473 shares

Expires 2023-03-01

F3 · derivative.exercise_price: 1 for 1

F4 · shares: The Board approved performance results for the performance-adjusted cash based restricted stock unit grant (15PSUC20) and the performance-adjusted stock based restricted stock unit grant (15PSUS20) made in 2020 for the 2020-2022 performance cycle, and these awards will vest on March 1, 2023.

F4 · balance_after: The Board approved performance results for the performance-adjusted cash based restricted stock unit grant (15PSUC20) and the performance-adjusted stock based restricted stock unit grant (15PSUS20) made in 2020 for the 2020-2022 performance cycle, and these awards will vest on March 1, 2023.

SEC source: 0001127602-23-004998 · form4.xml · derivative · entry 3

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,944.596

Underlying: Common Stock · 5,944.596 shares

Expires 2023-03-01

F3 · derivative.exercise_price: 1 for 1

F4 · shares: The Board approved performance results for the performance-adjusted cash based restricted stock unit grant (15PSUC20) and the performance-adjusted stock based restricted stock unit grant (15PSUS20) made in 2020 for the 2020-2022 performance cycle, and these awards will vest on March 1, 2023.

F4 · balance_after: The Board approved performance results for the performance-adjusted cash based restricted stock unit grant (15PSUC20) and the performance-adjusted stock based restricted stock unit grant (15PSUS20) made in 2020 for the 2020-2022 performance cycle, and these awards will vest on March 1, 2023.

SEC source: 0001127602-22-008163 · form4.xml · derivative · entry 9

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,010

Underlying: Common Stock · 10,010 shares

Expires not disclosed

F7 · derivative.exercise_price: 1 for 1

F5 · price: This transaction represents the deferral of the 15PSUS19 award. As a result, the reporting person is reporting the disposition of common stock in exchange for an equal number of shares of phantom stock described below.

F8 · derivative.exercise_date: This holding reflects phantom stock payable in cash upon retirement or other termination of employment under the FirstEnergy Corp. Amended and Restated Executive Deferred Compensation Plan. Each share of phantom stock is the economic equivalent of one share of common stock.

F8 · derivative.expiration_date: This holding reflects phantom stock payable in cash upon retirement or other termination of employment under the FirstEnergy Corp. Amended and Restated Executive Deferred Compensation Plan. Each share of phantom stock is the economic equivalent of one share of common stock.

SEC source: 0001127602-22-008163 · form4.xml · derivative · entry 8

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 10,659 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.

F7 · derivative.exercise_price: 1 for 1

F2 · price: 1 for 1. The 15PSUC19 and 15PSUS19 awards were previously granted for $0.00 under the FirstEnergy Corp. 2015 Incentive Compensation Plan.

F4 · derivative.exercise_date: Represents the vesting of the 15PSUS19 award. The award vested on March 1, 2022. The shares coded "F" were automatically withheld to cover tax obligations associated with the payout. Amounts also include dividend reinvestments.

F4 · derivative.expiration_date: Represents the vesting of the 15PSUS19 award. The award vested on March 1, 2022. The shares coded "F" were automatically withheld to cover tax obligations associated with the payout. Amounts also include dividend reinvestments.

SEC source: 0001127602-22-008163 · form4.xml · derivative · entry 7

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 5,328.763 shares

Expires not disclosed

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

F7 · derivative.exercise_price: 1 for 1

F2 · price: 1 for 1. The 15PSUC19 and 15PSUS19 awards were previously granted for $0.00 under the FirstEnergy Corp. 2015 Incentive Compensation Plan.

F1 · derivative.exercise_date: Represents the vesting of the 15PSUC19 award. The award vested on March 1, 2022. Amounts also include dividend reinvestments.

F1 · derivative.expiration_date: Represents the vesting of the 15PSUC19 award. The award vested on March 1, 2022. Amounts also include dividend reinvestments.

SEC source: 0001127602-22-008163 · form4.xml · nonDerivative · entry 5

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,297.775

F4 · shares: Represents the vesting of the 15PSUS19 award. The award vested on March 1, 2022. The shares coded "F" were automatically withheld to cover tax obligations associated with the payout. Amounts also include dividend reinvestments.

F3 · balance_after: Balance includes shares acquired through dividend reinvestments.

SEC source: 0001127602-22-008163 · form4.xml · nonDerivative · entry 4

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,946.775

F5 · shares: This transaction represents the deferral of the 15PSUS19 award. As a result, the reporting person is reporting the disposition of common stock in exchange for an equal number of shares of phantom stock described below.

F5 · price: This transaction represents the deferral of the 15PSUS19 award. As a result, the reporting person is reporting the disposition of common stock in exchange for an equal number of shares of phantom stock described below.

F3 · balance_after: Balance includes shares acquired through dividend reinvestments.

SEC source: 0001127602-22-008163 · form4.xml · nonDerivative · entry 3

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,956.775

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

F4 · shares: Represents the vesting of the 15PSUS19 award. The award vested on March 1, 2022. The shares coded "F" were automatically withheld to cover tax obligations associated with the payout. Amounts also include dividend reinvestments.

F2 · price: 1 for 1. The 15PSUC19 and 15PSUS19 awards were previously granted for $0.00 under the FirstEnergy Corp. 2015 Incentive Compensation Plan.

F3 · balance_after: Balance includes shares acquired through dividend reinvestments.

SEC source: 0001127602-22-008163 · form4.xml · nonDerivative · entry 2

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,297.775

F1 · shares: Represents the vesting of the 15PSUC19 award. The award vested on March 1, 2022. Amounts also include dividend reinvestments.

F3 · balance_after: Balance includes shares acquired through dividend reinvestments.

SEC source: 0001127602-22-008163 · form4.xml · nonDerivative · entry 1

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,626.538

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 the vesting of the 15PSUC19 award. The award vested on March 1, 2022. Amounts also include dividend reinvestments.

F2 · price: 1 for 1. The 15PSUC19 and 15PSUS19 awards were previously granted for $0.00 under the FirstEnergy Corp. 2015 Incentive Compensation Plan.

F3 · balance_after: Balance includes shares acquired through dividend reinvestments.

SEC source: 0001127602-22-003548 · form4.xml · derivative · entry 4

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,559.174

Underlying: Common Stock · 10,559.174 shares

Expires 2022-03-01

F3 · derivative.exercise_price: 1 for 1

F4 · shares: The Board approved performance results for the performance-adjusted cash based restricted stock unit grant (15PSUC19) and the performance-adjusted stock based restricted stock unit grant (15PSUS19) made in 2019 for the 2019-2021 performance cycle, and these awards will vest on March 1, 2022.

F4 · balance_after: The Board approved performance results for the performance-adjusted cash based restricted stock unit grant (15PSUC19) and the performance-adjusted stock based restricted stock unit grant (15PSUS19) made in 2019 for the 2019-2021 performance cycle, and these awards will vest on March 1, 2022.

SEC source: 0001127602-22-003548 · form4.xml · derivative · entry 3

K. Jon Taylor · CIK 0001575883 · SVP, CFO and Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,279.234

Underlying: Common Stock · 5,279.234 shares

Expires 2022-03-01

F3 · derivative.exercise_price: 1 for 1

F4 · shares: The Board approved performance results for the performance-adjusted cash based restricted stock unit grant (15PSUC19) and the performance-adjusted stock based restricted stock unit grant (15PSUS19) made in 2019 for the 2019-2021 performance cycle, and these awards will vest on March 1, 2022.

F4 · balance_after: The Board approved performance results for the performance-adjusted cash based restricted stock unit grant (15PSUC19) and the performance-adjusted stock based restricted stock unit grant (15PSUS19) made in 2019 for the 2019-2021 performance cycle, and these awards will vest on March 1, 2022.

SEC source: 0001127602-21-013037 · form4.xml · nonDerivative · entry 1

K. Jon Taylor · CIK 0001575883 · SVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,297.104

F1 · kind: This transaction reflects the number of shares withheld pursuant to the terms of the Restricted Stock Award Agreement and in accordance with the FirstEnergy Corp. 2015 Incentive Compensation Plan, as amended, to satisfy the reporting person's tax withholding obligation upon the vesting of 8,707.599 shares of restricted common stock.

F2 · balance_after: Balance includes shares acquired through dividend reinvestment.

SEC source: 0001127602-21-009307 · form4.xml · derivative · entry 9

K. Jon Taylor · CIK 0001575883 · SVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,758

Underlying: Common Stock · 13,758 shares

Expires not disclosed

F7 · derivative.exercise_price: 1 for 1

F5 · price: This transaction represents the deferral of the RSUS18 award. As a result, the reporting person is reporting the disposition of common stock in exchange for an equal number of shares of phantom stock described below.

F8 · derivative.exercise_date: This holding reflects phantom stock payable in cash upon retirement or other termination of employment under the FirstEnergy Corp. Amended and Restated Executive Deferred Compensation Plan. Each share of phantom stock is the economic equivalent of one share of common stock.

F8 · derivative.expiration_date: This holding reflects phantom stock payable in cash upon retirement or other termination of employment under the FirstEnergy Corp. Amended and Restated Executive Deferred Compensation Plan. Each share of phantom stock is the economic equivalent of one share of common stock.

SEC source: 0001127602-21-009307 · form4.xml · derivative · entry 8

K. Jon Taylor · CIK 0001575883 · SVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 14,650 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.

F7 · derivative.exercise_price: 1 for 1

F2 · price: 1 for 1. The RSUS18 and RSUC18 awards were previously granted for $0.00 under the FirstEnergy Corp. 2015 Incentive Compensation Plan.

F4 · derivative.exercise_date: Represents the vesting of the RSUS18 award. The award vested on March 1, 2021. The shares coded "F" were automatically withheld to cover tax obligations associated with the payout. Amounts also include dividend reinvestment.

F4 · derivative.expiration_date: Represents the vesting of the RSUS18 award. The award vested on March 1, 2021. The shares coded "F" were automatically withheld to cover tax obligations associated with the payout. Amounts also include dividend reinvestment.

SEC source: 0001127602-21-009307 · form4.xml · derivative · entry 7

K. Jon Taylor · CIK 0001575883 · SVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 7,324.448 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.

F7 · derivative.exercise_price: 1 for 1

F2 · price: 1 for 1. The RSUS18 and RSUC18 awards were previously granted for $0.00 under the FirstEnergy Corp. 2015 Incentive Compensation Plan.

F1 · derivative.exercise_date: Represents the vesting of the RSUC18 award. The award vested on March 1, 2021. Amounts also include dividend reinvestment.

F1 · derivative.expiration_date: Represents the vesting of the RSUC18 award. The award vested on March 1, 2021. Amounts also include dividend reinvestment.

SEC source: 0001127602-21-009307 · form4.xml · nonDerivative · entry 5

K. Jon Taylor · CIK 0001575883 · SVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,246.104

F4 · shares: Represents the vesting of the RSUS18 award. The award vested on March 1, 2021. The shares coded "F" were automatically withheld to cover tax obligations associated with the payout. Amounts also include dividend reinvestment.

F3 · balance_after: Balance includes restricted stock and shares acquired through dividend reinvestment.

SEC source: 0001127602-21-009307 · form4.xml · nonDerivative · entry 4

K. Jon Taylor · CIK 0001575883 · SVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,138.104

F5 · shares: This transaction represents the deferral of the RSUS18 award. As a result, the reporting person is reporting the disposition of common stock in exchange for an equal number of shares of phantom stock described below.

F5 · price: This transaction represents the deferral of the RSUS18 award. As a result, the reporting person is reporting the disposition of common stock in exchange for an equal number of shares of phantom stock described below.

F3 · balance_after: Balance includes restricted stock and shares acquired through dividend reinvestment.