Form 3: Initial Statement of Beneficial Ownership

This filing is an initial statement of beneficial ownership, Form 3, for Joyce A. Mullen, a director at Duke Energy CORP. The statement was signed on September 29, 2026, for the period of September 28, 2026. The filing includes an exhibit which is a Power of Attorney. Joyce A. Mullen is identified as a director, not an officer or 10% owner. The filing does not include details on derivative or non-derivative securities owned.