FirstEnergy

of Form 8-K, this Current Report on Form 8-K/A amends and supplements the information reported in

On March 23, 2021, Sandra Pianalto, a member of the Board of Directors (the “Board”) of FirstEnergy Corp. (the “Company”), provided notice to the Company that she does not intend to stand for re-election as a member of the Board at the Company’s 2021 annual meeting of shareholders (the “Annual Meeting”). Ms. Pianalto will continue to serve as a member of the Board until the Annual Meeting.

by reference. Item 7.01 Regulation FD Disclosure. On March 16, 2021, the Company issued a press release announcing the execution of the Agreement and the appointments of Mr. Teno and Mr. Lynn to the Board, which is attached as Exhibit 99.1 hereto and incorporated herein by reference. The information set forth in and incorporated into this

On March 7, 2021, the Board of Directors (the “Board”) of FirstEnergy Corp. (“FirstEnergy” or the “Company”) appointed Mr. Steven E. Strah to the position of Chief Executive Officer of FirstEnergy, effective as of March 8, 2021. Mr. Strah has served as Acting Chief Executive Officer of the Company since October 29, 2020, and will continue to serve as President of the Company, a position he has held since May 2020. On March 7, 2021, at the recommendation of the Corporate Governance and Corporate Responsibility Committee, the Board also elected Mr. Strah as a Director of the Company, effective as of March 8, 2021, increasing the size of the Board from 11 to 12 members. Mr. Strah has been elected to the Board to serve for a term expiring at the Company’s 2021 Annual Meeting of Shareholders and until his successor shall have been elected. Mr.

On February 17, 2021, at the recommendation of the Corporate Governance and Corporate Responsibility Committee, the Board of Directors (the “Board”) of FirstEnergy Corp. (“FirstEnergy” or the “Company”) appointed Mr. John W. Somerhalder to the positions of Vice Chairperson and Executive Director, each effective as of March 1, 2021, increasing the size of the Board from 10 to 11 members. Mr. Somerhalder has been elected to serve for a term expiring at the Company’s 2021 Annual Meeting of Shareholders and until his successor shall have been elected. Mr. Donald T. Misheff will continue to serve as Non-Executive Chairman of the Board. Mr. Christopher D.

Officer Separation Robert Reffner, the Senior Vice President and Chief Legal Officer of FirstEnergy Corp. (“FirstEnergy” or the “Company”), was separated from the Company effective as of November 8, 2020. In addition, Ebony Yeboah-Amankwah, the Company’s Vice President, General Counsel, and Chief Ethics Officer, was separated from the Company effective as of November 8, 2020. Executive Officer Compensation As previously disclosed, on October 29, 2020, the Board of Directors (the “Board”) of FirstEnergy appointed Mr. Steven E. Strah, President of the Company, to also serve as Acting Chief Executive Officer of FirstEnergy, effective as of October 29, 2020. On November 8, 2020, the Board approved the following compensation changes for Mr.

Officer and Executive Director Appointments On October 29, 2020, the Independent Review Committee of the Board of Directors (the “Committee”) of FirstEnergy Corp. (“FirstEnergy” or “the Company”) appointed Mr. Steven E. Strah to the position of Acting Chief Executive Officer and Mr. Christopher D. Pappas, a current member of the Board of Directors (the “Board”), to the temporary position of Executive Director, each effective as of October 29, 2020. Mr. Donald T. Misheff will continue to serve as Non-Executive Chairman of the Board. Mr. Strah, age 56, currently serves as President of the Company, a position he has held since May 2020. He previously served as Senior Vice President and Chief Financial Officer of the Company from 2018-2020, Senior Vice President and President of FirstEnergy Utilities from 2015-2018, and President at various FirstEnergy subsidiaries from 2001-2014. Mr.

Officer Appointments On May 19, 2020, the Board of Directors (the “Board”) of FirstEnergy Corp. (“FirstEnergy” or “Company”) appointed Steven E. Strah as President and K. Jon Taylor as Senior Vice President and Chief Financial Officer of the Company, each effective as of May 24, 2020. Mr. Charles E. Jones, the Company’s current President and Chief Executive Officer, will continue to serve as Chief Executive Officer. Mr. Strah, age 56, currently serves as Senior Vice President and Chief Financial Officer of the Company, a position he has held since 2018, and he previously served as Senior Vice President of the Company and President, FirstEnergy Utilities from 2015-2018. As President, Mr. Strah will oversee utility operations; corporate services and information technology; finance; product development, marketing and branding; external affairs; rates and regulatory affairs; and strategy.

As previously announced, on March 31, 2018 FirstEnergy Solutions Corp. (FES), all of its subsidiaries, and FirstEnergy Nuclear Operating Company, each wholly-owned subsidiaries of FirstEnergy Corp. (FirstEnergy or the Company), voluntarily filed petitions for relief under Chapter 11 of the U.S. Bankruptcy Code with the U.S. Bankruptcy Court for the Northern District of Ohio in Akron. On February 26, 2019, the FES board of directors, in consultation with FES President Donald R. Schneider, who is deemed a named executive officer of the Company, agreed that he will retire as an officer of FES effective as of May 1, 2019. Mr. Schneider will step down as FES President, effective March 2, 2019, but he will remain executive chairman until his retirement date with no changes to his compensation.

(b) Retirement of Mr. Pearson As previously announced, FirstEnergy Corp. (Company) implemented an Executive Voluntary Enhanced Retirement Program (E-VERP) in July 2018 for executive officers other than the Chief Executive Officer, including certain named executive officers. James F. Pearson, Executive Vice President, Finance of the Company, notified the Company that he was electing to participate in the E-VERP. At the time of the original announcement, Mr. Pearson’s retirement date had not yet been determined. As determined by the Company in consultation with Mr. Pearson on February 18, 2019, the effective date of Mr. Pearson’s retirement has been determined to be April 1, 2019. Upon his retirement, Mr.

As previously announced, on March 31, 2018 FirstEnergy Solutions Corp. (FES), all of its subsidiaries, and FirstEnergy Nuclear Operating Company (collectively, the FES Debtors), each wholly owned subsidiaries of FirstEnergy Corp. (FirstEnergy), voluntarily filed petitions for relief under Chapter 11 of the U.S. Bankruptcy Code with the U.S. Bankruptcy Court for the Northern District of Ohio in Akron (the Bankruptcy Court). On November 29, 2018, the FES Board of Directors adopted the FirstEnergy Solutions Corp. 2019 Annual Incentive Program (the 2019 FES AIP), in which FES President Donald Schneider, who is deemed a named executive officer of FirstEnergy, participates.

As previously announced, on March 31, 2018 FirstEnergy Solutions Corp. (FES), all of its subsidiaries, and FirstEnergy Nuclear Operating Company (collectively, the FES Debtors), each wholly-owned subsidiaries of FirstEnergy Corp. (FirstEnergy), voluntarily filed petitions for relief under Chapter 11 of the U.S. Bankruptcy Code with the U.S. Bankruptcy Court for the Northern District of Ohio in Akron (the Bankruptcy Court). Additionally, on August 26, 2018, FirstEnergy, the FES Debtors, certain key creditor groups, and the official committee of unsecured creditors entered into a definitive settlement agreement, which was approved by order of the Bankruptcy Court on September 26, 2018.

(d) Election of Ms. Leslie M. Turner On September 18, 2018, at the recommendation of FirstEnergy Corp.’s (FirstEnergy or Company) Corporate Governance, Sustainability and Corporate Responsibility Committee, the Company’s Board of Directors (Board) elected Leslie M. Turner, age 60, to the Board effective September 19, 2018, increasing the size of the Board from 12 to 13 members. Ms. Turner has been elected to serve for a term expiring at the Company’s 2019 Annual Meeting of Shareholders and until her successor shall have been elected. The Board has affirmatively determined that, at September 18, 2018, Ms. Turner is an independent director under the regulations of the Securities and Exchange Commission (SEC) and the listing standards of the New York Stock Exchange. Ms.

FirstEnergy Corp. (Company) previously implemented a Voluntary Enhanced Retirement Program (VERP) in early June 2018 that was offered to eligible non-bargaining employees , other than executive officers, in the Company’s shared services and utility services and sustainability organizations. The VERP is part of the Company’s initiative focused on reducing shared services to align to the organizational structure for the Company’s previously announced strategy to exit the competitive generation business and become a fully regulated utility company . Active non-bargaining employees in qualifying business units who are age 58 or older with at least 10 years of service as of December 31, 2018, were eligible to participate.

(b) Retirements of Mr. Cottle and Mr. Smart On February 20, 2018, William T. Cottle and George M. Smart each tendered their notice of retirement from the FirstEnergy Corp. (Company) Board of Directors (Board) , effective May 15, 2018, the date of the 2018 Annual Meeting of Shareholders, as they each have reached the mandatory retirement age of 72 designated in the Company’s Corporate Governance Policies. On February 2 0 , 2018, the Board accepted their notices of retirement, which will become effective May 15, 2018, the date of the next Annual Meeting of Shareholders, at which time the size of the Board will be decreased from 14 to 12 . Also on February 20, 2018, the Board elected Donald T. Misheff as non-executive Chairman of the Board, effective immediately following the Company’s 2018 Annual Meeting of Shareholders at which Mr. Smart is retiring. (d) Election of Ms.

As previously disclosed, the initial term of the FirstEnergy Corp. 2017 Change in Control Severance Plan (Plan) commenced on January 1, 2017 and expires on December 31, 2018. The Plan is subject to annual review by the FirstEnergy Corp. (FirstEnergy) Board of Directors (Board) to consider whether or not to extend the term of the Plan for an additional year. On September 19, 2017, upon recommendation of its Compensation Committee, the Board determined to extend the term of the Plan for an additional year through December 31, 2019. As previously disclosed, the Plan provides for the payment of severance benefits to certain eligible executives of FirstEnergy in the event their employment with FirstEnergy terminates under certain circumstances during the 24-month period following a change in control of FirstEnergy.

(b) On June 15, 2017, James H. Lash, Executive Vice President of FirstEnergy Corp. (the Company) and President, FirstEnergy Generation, indicated his intention to retire effective August 1, 2017. The effective date provides the Company with the appropriate time to ensure an effective transition period. There was no disagreement or dispute with the Company surrounding Mr. Lash’s decision. 2

of Form 8-K, this Current Report on Form 8-K/A amends and supplements the information reported in

(b) On February 21, 2017, Ernest J. Novak, Jr. and Ted J. Kleisner each tendered their notice of retirement from the FirstEnergy Corp. (Company) Board of Directors (Board) effective May 16, 2017, the date of the 2017 Annual Meeting of Shareholders, as they each have reached the mandatory retirement age of 72, as designated in the Company’s Corporate Governance Policies. On February 21, 2017, the Board accepted each of their notices of retirement, which will become effective May 16, 2017, the date of the next Annual Meeting of Shareholders, at which time the size of the Board will be decreased from 16 to 13 (taking into account the Board’s decision to not re-nominate Robert B. Heisler, Jr., due to health reasons, whose term ends at the Annual Meeting on May 16, 2017).

(d) On January 17, 2017, at the recommendation of FirstEnergy Corp.’s (Company) Corporate Governance Committee, the Company’s Board of Directors (Board) elected Steven J. Demetriou, age 58, and James F. O’Neil III, age 58, to serve as directors of the Board, effective immediately, increasing the size of the Board from 14 to 16 members. Messrs. Demetriou and O’Neil have been appointed to serve for a term expiring at the Company’s annual meeting of shareholders in 2017 and until their successors shall have been elected. The Board has affirmatively determined that, at January 17, 2017, Messrs. Demetriou and O’Neil are independent directors under the regulations of the Securities and Exchange Commission (SEC) and the listing standards of the New York Stock Exchange. Mr.

Election of Directors; Appointment of Certain Officers; Compensatory Agreements for Certain Officers. (e) Amended and Restated Plan On December 20, 2016, upon recommendation of its Compensation Committee, the Board of Directors of FirstEnergy Corp. (Company) approved the Executive Severance Benefits Plan, as amended and restated (Executive Plan). The named executive officers of the Company are eligible to participate in the Executive Plan, other than Charles E. Jones, the Chief Executive Officer and President of the Company.

(d) On January 19, 2016, FirstEnergy Corp. (Company) announced that Thomas N. Mitchell, age 60, has been elected to the Company’s Board of Directors (Board), effective immediately, bringing the size of the Board to 14. Mr. Mitchell has been appointed to serve for a term expiring at the Company’s annual meeting of shareholders in 2016 and until his successor is elected. Mr. Mitchell has extensive experience in the nuclear industry. He is the recently retired president and chief executive officer and director of Ontario Power Generation, Inc., an Ontario-based electricity generation company. He is a former director and member of the leadership and compensation committee of the Electric Power Research Institute. The Board has affirmatively determined that, at January 19, 2016, Mr.