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(the \"Company\") and the reporting person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Balance has been updated since the reporting person's last filed Form 4 to include shares acquired through dividend reinvestments."}],"balance_after":523810.372,"source":{"system":"sec-edgar","filing":"0001031296-26-000094","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1031296/000103129626000094/form4.xml","form_type":"4"}},{"id":869749,"issuer":{"id":3171,"kind":"organization","name":"FIRSTENERGY CORP","symbol":"FE"},"owners":[{"id":41920,"kind":"person","name":"TIERNEY BRIAN X","position":1,"cik":"0001423515","reported_name":"TIERNEY BRIAN X","relationship":{"director":true,"officer":true,"officer_title":"Chairman, President and CEO"}}],"security":"RSU","published_at":"2026-03-04T02:53:50.000Z","date":"2026-03-01","kind":"exercise","planned":false,"acquired":false,"shares":229580.554,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F7","text":"RSUs convert into the Company's common stock on a one-for-one basis."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"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."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"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."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":229580.554},"source":{"system":"sec-edgar","filing":"0001031296-26-000057","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1031296/000103129626000057/form4.xml","form_type":"4"}},{"id":869748,"issuer":{"id":3171,"kind":"organization","name":"FIRSTENERGY CORP","symbol":"FE"},"owners":[{"id":41920,"kind":"person","name":"TIERNEY BRIAN X","position":1,"cik":"0001423515","reported_name":"TIERNEY BRIAN X","relationship":{"director":true,"officer":true,"officer_title":"Chairman, President and CEO"}}],"security":"Common Stock","published_at":"2026-03-04T02:53:50.000Z","date":"2026-03-01","kind":"disposition_to_issuer","planned":false,"acquired":false,"shares":76302.554,"price":50.97,"value":3889141.17738,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F5","text":"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."}],"balance_after":538135.084,"source":{"system":"sec-edgar","filing":"0001031296-26-000057","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1031296/000103129626000057/form4.xml","form_type":"4"}},{"id":869747,"issuer":{"id":3171,"kind":"organization","name":"FIRSTENERGY CORP","symbol":"FE"},"owners":[{"id":41920,"kind":"person","name":"TIERNEY BRIAN X","position":1,"cik":"0001423515","reported_name":"TIERNEY BRIAN X","relationship":{"director":true,"officer":true,"officer_title":"Chairman, President and CEO"}}],"security":"Common Stock","published_at":"2026-03-04T02:53:50.000Z","date":"2026-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":68362,"price":50.97,"value":3484411.14,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Represents shares of common stock of the Company automatically 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."}],"balance_after":614437.638,"source":{"system":"sec-edgar","filing":"0001031296-26-000057","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1031296/000103129626000057/form4.xml","form_type":"4"}},{"id":869746,"issuer":{"id":3171,"kind":"organization","name":"FIRSTENERGY CORP","symbol":"FE"},"owners":[{"id":41920,"kind":"person","name":"TIERNEY BRIAN X","position":1,"cik":"0001423515","reported_name":"TIERNEY BRIAN X","relationship":{"director":true,"officer":true,"officer_title":"Chairman, President and CEO"}}],"security":"Common Stock","published_at":"2026-03-04T02:53:50.000Z","date":"2026-03-01","kind":"exercise","planned":false,"acquired":true,"shares":229580.554,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"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."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The RSUs converted into shares of the Company's common stock on a one-for-one basis under the Company 2020 Incentive Compensation Plan."}],"balance_after":682799.638,"source":{"system":"sec-edgar","filing":"0001031296-26-000057","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1031296/000103129626000057/form4.xml","form_type":"4"}},{"id":869745,"issuer":{"id":3171,"kind":"organization","name":"FIRSTENERGY CORP","symbol":"FE"},"owners":[{"id":41920,"kind":"person","name":"TIERNEY BRIAN X","position":1,"cik":"0001423515","reported_name":"TIERNEY BRIAN X","relationship":{"director":true,"officer":true,"officer_title":"Chairman, President and CEO"}}],"security":"Common Stock","published_at":"2026-03-04T02:53:50.000Z","date":"2026-03-01","kind":"grant","planned":false,"acquired":true,"shares":80342,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."}],"balance_after":453219.084,"source":{"system":"sec-edgar","filing":"0001031296-26-000057","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1031296/000103129626000057/form4.xml","form_type":"4"}},{"id":905742,"issuer":{"id":3171,"kind":"organization","name":"FIRSTENERGY CORP","symbol":"FE"},"owners":[{"id":41920,"kind":"person","name":"TIERNEY BRIAN X","position":1,"cik":"0001423515","reported_name":"TIERNEY BRIAN X","relationship":{"director":true,"officer":true,"officer_title":"Chairman, President and CEO"}}],"security":"RSU","published_at":"2026-02-14T00:23:09.000Z","date":"2026-02-11","kind":"grant","planned":false,"acquired":true,"shares":227592.972,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Represents performance-adjusted restricted stock units (\"RSUs\") granted on June 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."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Represents performance-adjusted restricted stock units (\"RSUs\") granted on June 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."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Represents performance-adjusted restricted stock units (\"RSUs\") granted on June 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. 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(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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Balance includes dividends accrued on time-based equity awards."}],"balance_after":384408.891,"source":{"system":"sec-edgar","filing":"0001127602-25-016650","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1031296/000112760225016650/form4.xml","form_type":"4"}},{"id":1230943,"issuer":{"id":3171,"kind":"organization","name":"FIRSTENERGY CORP","symbol":"FE"},"owners":[{"id":41920,"kind":"person","name":"TIERNEY BRIAN X","position":1,"cik":"0001423515","reported_name":"TIERNEY BRIAN X","relationship":{"director":true,"officer":true,"officer_title":"Board Chair, President and CEO"}}],"security":"RSU","published_at":"2025-03-05T02:02:34.000Z","date":"2025-03-01","kind":"exercise","planned":false,"acquired":false,"shares":133587,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F5","text":"Share-Based RSUs convert into the Company's common stock on a one-for-one basis."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Represents the vesting of performance-adjusted restricted stock units (\"RSUs\"), each of which previously represented a contingent right to receive an RSU award payable in shares of common stock of FirstEnergy Corp. (the \"Company\") (\"Share-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."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Represents the vesting of performance-adjusted restricted stock units (\"RSUs\"), each of which previously represented a contingent right to receive an RSU award payable in shares of common stock of FirstEnergy Corp. (the \"Company\") (\"Share-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."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":133587},"source":{"system":"sec-edgar","filing":"0001127602-25-008127","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1031296/000112760225008127/form4.xml","form_type":"4"}},{"id":1230942,"issuer":{"id":3171,"kind":"organization","name":"FIRSTENERGY CORP","symbol":"FE"},"owners":[{"id":41920,"kind":"person","name":"TIERNEY BRIAN X","position":1,"cik":"0001423515","reported_name":"TIERNEY BRIAN X","relationship":{"director":true,"officer":true,"officer_title":"Board Chair, President and CEO"}}],"security":"Common Stock","published_at":"2025-03-05T02:02:34.000Z","date":"2025-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":60582,"price":38.355,"value":2323622.61,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"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."}],"balance_after":277807.602,"source":{"system":"sec-edgar","filing":"0001127602-25-008127","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1031296/000112760225008127/form4.xml","form_type":"4"}},{"id":1230941,"issuer":{"id":3171,"kind":"organization","name":"FIRSTENERGY CORP","symbol":"FE"},"owners":[{"id":41920,"kind":"person","name":"TIERNEY BRIAN X","position":1,"cik":"0001423515","reported_name":"TIERNEY BRIAN X","relationship":{"director":true,"officer":true,"officer_title":"Board Chair, President and CEO"}}],"security":"Common Stock","published_at":"2025-03-05T02:02:34.000Z","date":"2025-03-01","kind":"exercise","planned":false,"acquired":true,"shares":133587,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the vesting of performance-adjusted restricted stock units (\"RSUs\"), each of which previously represented a contingent right to receive an RSU award payable in shares of common stock of FirstEnergy Corp. 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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, 2025, generally subject to the reporting person's continued service."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Represents performance-adjusted restricted stock units (\"RSUs\"), each of which represents a contingent right to receive an award payable in Company common stock 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, 2025, generally subject to the reporting person's continued service."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Represents performance-adjusted restricted stock units (\"RSUs\"), each of which represents a contingent right to receive an award payable in Company common stock 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. 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(the \"Company\") 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."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"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 in shares of common stock of FirstEnergy Corp. (the \"Company\") following the vesting date. 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