FIRSTENERGY CORP

Amendments to Existing Revolving Credit Facilities

On October 24, 2024, FE and certain of its subsidiaries entered into the following amendments to each of the 2021 Credit Facilities to, among other things: (i) extend the maturity date of the 2021 Credit Facilities for an additional one-year period, from October 18, 2027 to October 18, 2028, and (ii) increase the borrowing limit of the JCP&L credit facility from $500 million to $750 million.

•Amendment No. 3 to Credit Agreement, dated as of October 24, 2024, among FE, as borrower, the banks and other financial institutions party thereto, as lenders, and JPMorgan Chase Bank, N.A., as administrative agent;

•Amendment No. 3 to Credit Agreement, dated as of October 24, 2024, among CEI, OE and TE, as borrowers, the banks and other financial institutions party thereto, as lenders, and JPMorgan Chase Bank, N.A., as administrative agent;

•Amendment No. 3 to Credit Agreement, dated as of October 24, 2024, among FE PA, as borrower, the banks and other financial institutions party thereto, as lenders, and Mizuho Bank, Ltd., as administrative agent;

•Amendment No. 3 to Credit Agreement, dated as of October 24, 2024, among JCP&L, as borrower, the banks and other financial institutions party thereto, as lenders, and Mizuho Bank, Ltd., as administrative agent;

•Amendment No. 3 to Credit Agreement, dated as of October 24, 2024, among MP and PE, the banks and other financial institutions party thereto, as lenders, and Mizuho Bank, Ltd., as administrative agent; and

•Amendment No. 3 to Credit Agreement, dated as of October 24, 2024, among ATSI, MAIT and TrAIL, as borrower, the banks and other financial institutions party thereto, as lenders, and PNC Bank, National Association, as administrative agent.

The foregoing descriptions of the amendments to the 2021 Credit Facilities above do not purport to be complete and are qualified in their entirety by reference to the agreements themselves.

Also on October 24, 2024, each of FET and KATCo entered into amendments of the 2023 Credit Facilities, to, among other things, extend the maturity date of the 2023 Credit Facilities for an additional one-year period, from October 20, 2028 to October 20, 2029 and from October 20, 2027 to October 20, 2028, for the FET credit facility and KATCo credit facility respectively as follows:

•Amendment No. 1 to Credit Agreement, dated as of October 24, 2024, among FET, as borrower, the banks and other financial institutions party thereto, as lenders, and JPMorgan Chase Bank, N.A., as administrative agent and

•Amendment No. 1 to Credit Agreement, dated as of October 24, 2024, among KATCo, as borrower, the banks and other financial institutions party thereto, as lenders, and PNC Bank, National Association, as administrative agent.

The foregoing descriptions of the amendments to the 2023 Credit Facilities above do not purport to be complete and are qualified in their entirety by reference to the agreements themselves.

Trading Arrangements

During the quarter ended September 30, 2024, no director or officer (as defined in Rule 16a-1(f) promulgated under the Exchange Act) of FEadopted orterminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement” (as each term is defined in Item 408 of Regulation S-K).