On April 1, 2026, OGE Energy Corp. completed the issuance of $350.0 million in aggregate principal amount of its 5.90% Senior Notes, Series due April 1, 2056 (the "OG&E Senior Notes"). The offering of the OG&E Senior Notes was registered under the Securities Act of 1933, as amended, pursuant to OG&E's registration statement on Form S-3ASR (File No.

333-279061-01). A prospectus supplement relating to the offering and sale of the OG&E Senior Notes was filed with the Securities and Exchange Commission on March 24, 2026.