UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D. C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): December 13, 2016

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2.):

Item 1.01 - Entry into a Material Definitive Agreement.

The information provided in Item 3.02 of this Current Report is incorporated herein by reference into this Item 1.01.

Item 3.02 - Unregistered Sale of Equity Securities.

On December 13, 2016, FirstEnergy Corp. (FirstEnergy) contributed 16,097,875 shares of its Common Stock, $0.10 par value (the Shares), to the FirstEnergy System Master Retirement Trust (the Qualified Pension Trust) to satisfy certain future funding obligations of FirstEnergy and its subsidiaries to the Qualified Pension Trust. The Shares were contributed in a private placement, exempt from registration requirements pursuant to Rule 506(c) under the Securities Act of 1933, as amended (the Securities Act), and in accordance with the terms of the contribution agreement, dated December 13, 2016 (the Contribution Agreement), with State Street Bank and Trust Company (State Street), in its capacity as independent fiduciary and investment manager of a segregated account in the Qualified Pension Trust. The Shares were valued at $499,999,997.50 in the aggregate by State Street, on behalf of the Qualified Pension Trust, at the time of the contribution.

In connection with the Contribution Agreement, FirstEnergy also entered into a registration rights agreement, dated December 13, 2016 (the Registration Rights Agreement), with State Street, in its capacity as independent fiduciary and investment manager of a segregated account in the Qualified Pension Trust, pursuant to which FirstEnergy agreed to provide certain registration rights with respect to the Shares. On December 13, 2016, in accordance with the terms of the Registration Rights Agreement, FirstEnergy filed a prospectus supplement (the Prospectus Supplement) to its effective shelf registration statement on Form S-3ASR (File No. 333-204422) filed with the Securities and Exchange Commission on May 22, 2015 (the Registration Statement), for the purpose of registering the resale, from time to time, of the Shares by the Qualified Pension Trust. The Registration Rights Agreement includes customary exceptions permitting FirstEnergy to suspend the use of the Prospectus Supplement from time to time.

The foregoing summaries of the Contribution Agreement and the Registration Rights Agreement are qualified in their entirety by reference to the text of the Contribution Agreement and the Registration Rights Agreement, which are filed as Exhibits 10.1 and 4.1 hereto, respectively, and are incorporated herein by reference.

In addition, separate from its role as independent fiduciary and investment manager of a segregated account in the Qualified Pension Trust, State Street serves as a trustee in connection with the FirstEnergy Corp. Savings Plan. Furthermore, State Street Global Advisors, a division of State Street, serves as an independent fiduciary and investment manager for shares of FirstEnergy common stock in the FirstEnergy Corp. Savings Plan. State Street Corporation, an affiliate of State Street, together with certain of its affiliates, beneficially owns 31,035,986 shares of our common stock, representing approximately 7.3% of the outstanding shares of our common stock as of the filing of State Street Corporation’s Schedule 13G with the Securities and Exchange Commission on February 12, 2016.

Item 8.01 – Other Events

In connection with the contribution of the Shares to the Qualified Pension Trust as described above in Item 3.02, the exhibits listed in Item 9.01 are filed herewith and incorporated by reference into the Registration Statement and the related prospectus contained therein, as supplemented by the Prospectus Supplement.

Item 9.01 - Financial Statements and Exhibits.

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Forward-Looking Statements: This Form 8-K includes forward-looking statements based on information currently available to management. Such statements are subject to certain risks and uncertainties. These statements include declarations regarding management’s intents, beliefs and current expectations. These statements typically contain, but are not limited to, the terms “anticipate,” “potential,” “expect,” “forecast,” “target,” “will,” “intend,” “believe,” “project,” “estimate,” “plan” and similar words. Forward-looking statements involve estimates, assumptions, known and unknown risks, uncertainties and other factors that may cause actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements, which may include the following: the speed and nature of increased competition in the electric utility industry, in general, and the retail sales market in particular; the ability to experience growth in the Regulated Distribution and Regulated Transmission segments; the accomplishment of our regulatory and operational goals in connection with our transmission investment plan, including, but not limited to, the proposed transmission asset transfer to Mid-Atlantic Interstate Transmission, LLC, and the effectiveness of our strategy to reflect a more regulated business profile; changes in assumptions regarding economic conditions within our territories, assessment of the reliability of our transmission system, or the availability of capital or other resources supporting identified transmission investment opportunities; the impact of the regulatory process and resulting outcomes on the matters at the federal level and in the various states in which we do business including, but not limited to, matters related to rates and the Electric Security Plan IV; the impact of the federal regulatory process on Federal Energy Regulatory Commission (FERC)-regulated entities and transactions, in particular FERC regulation of wholesale energy and capacity markets, including PJM Interconnection, L.L.C. (PJM) markets and FERC-jurisdictional wholesale transactions; FERC regulation of cost-of-service rates, including FERC Opinion No. 531’s revised Return on Equity methodology for FERC-jurisdictional wholesale generation and transmission utility service; and FERC’s compliance and enforcement activity, including compliance and enforcement activity related to North American Electric Reliability Corporation’s mandatory reliability standards; the uncertainties of various cost recovery and cost allocation issues resulting from American Transmission Systems, Incorporated’s realignment into PJM; economic or weather conditions affecting future sales and margins such as a polar vortex or other significant weather events, and all associated regulatory events or actions; changing energy, capacity and commodity market prices including, but not limited to, coal, natural gas and oil prices, and their availability and impact on margins and asset valuations, including without limitation impairments thereon; the risks and uncertainties at the Competitive Energy Services (CES) segment, including FirstEnergy Solutions Corp. and its subsidiaries and FirstEnergy Nuclear Operating Company, related to continued depressed wholesale energy and capacity markets, and the viability and/or success of strategic business alternatives, such as potential CES generating unit asset sales, the potential conversion of the remaining generation fleet from competitive operations to a regulated or regulated-like construct or the potential need to deactivate additional generating units; the risks and uncertainties associated with a lack of viable alternative strategies regarding the CES segment, thereby causing FES to seek protection under the bankruptcy laws and the losses, liabilities and claims arising from such bankruptcy proceeding; the continued ability of our regulated utilities to recover their costs; costs being higher than anticipated and the success of our policies to control costs and to mitigate low energy, capacity and market prices; other legislative and regulatory changes, and revised environmental requirements, including, but not limited to, the effects of the United States Environmental Protection Agency’s Clean Power Plan, Coal Combustion Residuals regulations, Cross-State Air Pollution Rule and Mercury and Air Toxics Standards programs, including our estimated costs of compliance, Clean Water Act (CWA) waste water effluent limitations for power plants, and CWA 316(b) water intake regulation; the uncertainty of the timing and amounts of the capital expenditures that may arise in connection with any litigation, including New Source Review litigation, or potential regulatory initiatives or rulemakings (including that such initiatives or rulemakings could result in our decision to deactivate or idle certain generating units); the uncertainties associated with the deactivation of older regulated and competitive units, including the impact on vendor commitments, such as long-term fuel and transportation agreements, and as it relates to the reliability of the transmission grid, the timing thereof; the impact of other future changes to the operational status or availability of our generating units and any capacity performance charges associated with unit unavailability; adverse regulatory or legal decisions and outcomes with respect to our nuclear operations (including, but not limited to, the revocation or non-renewal of necessary licenses, approvals or operating permits by the Nuclear Regulatory Commission or as a result of the incident at Japan’s Fukushima Daiichi Nuclear Plant); issues arising from the indications of cracking in the shield building at Davis-Besse; the risks and uncertainties associated with litigation, arbitration, mediation and like proceedings, including, but not limited to, any such proceedings related to vendor commitments, such as long-term fuel and transportation agreements; the impact of labor disruptions by our unionized workforce; replacement power costs being higher than anticipated or not fully hedged; the ability to comply with applicable state and federal reliability standards and energy efficiency and peak demand reduction mandates; changes in customers’ demand for power, including, but not limited to, changes resulting from the implementation of state and federal energy efficiency and peak demand reduction mandates; the ability to accomplish or realize anticipated benefits from strategic and

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financial goals, including, but not limited to, the ability to continue to reduce costs and to successfully execute our financial plans designed to improve our credit metrics and strengthen our balance sheet through, among other actions, our cash flow improvement plan and other proposed capital raising initiatives; our ability to improve electric commodity margins and the impact of, among other factors, the increased cost of fuel and fuel transportation on such margins; changing market conditions that could affect the measurement of certain liabilities and the value of assets held in our Nuclear Decommissioning Trusts, pension trusts and other trust funds, and cause us and/or our subsidiaries to make additional contributions sooner, or in amounts that are larger than currently anticipated; the impact of changes to significant accounting policies; the ability to access the public securities and other capital and credit markets in accordance with our financial plans, the cost of such capital and overall condition of the capital and credit markets affecting us and our subsidiaries; further actions that may be taken by credit rating agencies that could negatively affect us and/or our subsidiaries’ access to financing, increase the costs thereof, increase requirements to post additional collateral to support, or accelerate payments under outstanding commodity positions, letters of credit and other financial guarantees, and the impact of these events on the financial condition and liquidity of FirstEnergy and/or its subsidiaries, specifically the subsidiaries within the CES segment; the risks and uncertainties surrounding FirstEnergy’s need to obtain waivers from its bank group under FirstEnergy’s credit facilities caused by a debt to total capitalization ratio, as defined under each of such credit facilities, in excess of 65% resulting from impairment charges or other events at CES; changes in national and regional economic conditions affecting us, our subsidiaries and/or our major industrial and commercial customers, and other counterparties with which we do business, including fuel suppliers; the impact of any changes in tax laws or regulations or adverse tax audit results or rulings; issues concerning the stability of domestic and foreign financial institutions and counterparties with which we do business; the risks associated with cyber-attacks and other disruptions to our information technology system that may compromise our generation, transmission and/or distribution services and data security breaches of sensitive data, intellectual property and proprietary or personally identifiable information regarding our business, employees, shareholders, customers, suppliers, business partners and other individuals in our data centers and on our networks; and the risks and other factors discussed from time to time in our United States Securities and Exchange Commission (SEC) filings, and other similar factors. Dividends declared from time to time on FirstEnergy Corp.’s common stock during any period may in the aggregate vary from prior periods due to circumstances considered by FirstEnergy Corp.’s Board of Directors at the time of the actual declarations. A security rating is not a recommendation to buy or hold securities and is subject to revision or withdrawal at any time by the assigning rating agency. Each rating should be evaluated independently of any other rating. The foregoing factors should not be construed as exhaustive and should be read in conjunction with the other cautionary statements and risks that are included in our filings with the SEC, including but not limited to the most recent Annual Report on Form 10-K, any subsequent Quarterly Reports on Form 10-Q and Current Reports on Form 8-K. New factors emerge from time to time, and it is not possible for management to predict all such factors, nor assess the impact of any such factor on our business or the extent to which any factor, or combination of factors, may cause results to differ materially from those contained in any forward-looking statements. FirstEnergy expressly disclaims any current intention to update, except as required by law, any forward-looking statements contained herein as a result of new information, future events or otherwise.

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

December 13, 2016

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Exhibit Index

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