AEP Texas Inc.

During the three months ended March 31, 2026, none of the Company’s directors or officers (as defined in Rule 16a-1(f) of the Securities Exchange Act of 1934)adopted, terminated or modified a Rule 10b5-1 trading arrangement or non-Rule 10b5-1 trading arrangement (as such terms are defined in Item 408 of Regulation S-K of the Securities Act of 1933).

On April 30, 2026, AEP amended and restated two existing credit agreements: (a) a three-year $1,000,000,000 facility due in March 2027 was amended and restated to become a three-year $1,500,000,000 facility due in April 2029, and (b) a five-year $5,000,000,000 facility due in March 2029 was amended and restated to become a five-year $6,500,000,000 facility due in April 2031 (each a “Credit Agreement” and, collectively, the “Credit Agreements”). Each Credit Agreement is among AEP, the certain respective Lenders named therein, and Wells Fargo Bank, National Association, as Administrative Agent.

Borrowings and letters of credit issued under the Credit Agreements are subject to a variable interest rate and are available upon customary terms and conditions for facilities of this type. The Credit Agreements contain certain covenants and require AEP to maintain its percentage of debt to total capitalization at a level that does not exceed 67.5%. The method for calculating outstanding debt and other capital is contractually defined in the Credit Agreements. Nonperformance by AEP of any covenant could result in an event of default under either Credit Agreement. The acceleration of AEP’s payment obligations, or the obligations of certain of its respective subsidiaries, prior to maturity under any other agreement or instrument relating to debt outstanding in excess of $100 million would cause an event of default under each Credit Agreement and permit the lenders to declare AEP’s outstanding amounts payable. The Credit Agreements do not permit the lenders to refuse a draw on either facility if a material adverse change occurs.