FIRSTENERGY CORP

Trading Arrangements

During the quarter ended September 30, 2026, no director or officer (as defined in Rule 16a-1(f) promulgated under the Exchange Act) of the Registrants adopted 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).

Amendments to Existing Revolving Credit Facilities

The information set forth below is included for the purpose of providing disclosure under "Item 1.01 - Entry into a Material Definitive Agreement" and "Item 2.03 - Creation of a Direct Financial Obligation or an Obligation Under an Off-Balance Sheet Arrangement of a Registrant" of Form 8-K.

On October 23, 2026, FE, the Ohio Companies, MP and PE, KATCo, FET and ATSI, MAIT and TrAIL, FE PA, and JCP&L, entered into amendments to their respective credit facilities (collectively, and as amended on October 23, 2026), to, among other things: (i) extend the maturity date of each credit facility for an additional one-year period (a) from October 20, 2029 to October 20, 2030 for the KATCo credit facility, (b) from October 20, 2030 to October 20, 2031 for the FET credit facility and (c) from

October 18, 2029 to October 18, 2030 for the remaining Amended Credit Facilities; and (ii) allow for the option to extend the Credit Agreement by up to two additional one-year periods; and (iii) increase the letters of credit commitment amount from $100 million to $400 million for the MP and PE credit facility.

The amendments to the Amended Credit Facilities are as follows:

•Amendment No. 5 to Credit Agreement, dated as of October 23, 2026, 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. 5 to Credit Agreement, dated as of October 23, 2026, 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. 5 to Credit Agreement, dated as of October 23, 2026, among MP and PE, as borrowers, 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 23, 2026, among KATCo, as borrower, the banks and other financial institutions party thereto, as lenders, and PNC Bank, National Association, as administrative agent;

•Amendment No. 3 to Credit Agreement, dated as of October 23, 2026, among FET, as borrower, the banks and other financial institutions party thereto, as lenders, and JPMorgan Chase Bank, N.A., as administrative agent;

•Amendment No. 5 to Credit Agreement, dated as of October 23, 2026, among ATSI, MAIT and TrAIL, as borrowers, the banks and other financial institutions party thereto, as lenders, and PNC Bank, National Association, as administrative agent;

•Amendment No. 5 to Credit Agreement, dated as of October 23, 2026, among FE PA, as borrower, the banks and other financial institutions party thereto, as lenders, and Mizuho Bank, Ltd., as administrative agent; and

•Amendment No. 5 to Credit Agreement, dated as of October 23, 2026, among JCP&L, as borrower, the banks and other financial institutions party thereto, as lenders, and Mizuho Bank, Ltd., as administrative agent.

The foregoing description of the Amended Credit Facilities is qualified in its entirety by reference to each such amendment entered into by FE, the Ohio Companies, MP and PE, KATCo, FET, ATSI, MAIT and TrAIL, FE PA, and JCP&L, each of which is filed hereto as Exhibits 10.1, 10.2, 10.3, 10.4, 10.5 and 10.6 under FE, 10.1 under FE PA and 10.1 under JCP&L, and incorporated herein by reference.