Securities registered pursuant to Section 12(g) of the Act: NoneIndicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. OGE Energy Corp.☑Yes☐NoOklahoma Gas and Electric Company☑Yes☐No Indicate by check mark if the registrant is not required tofile reports pursuant to Section 13 or 15(d) of the Act. OGE Energy Corp.☐Yes☑NoOklahoma Gas and Electric Company☐Yes☑No Indicate by check mark whether the registrant (1) hasfiled all reports required to befiled by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12months (or for such shorter period that the registrant was required tofile such reports), and (2) has been subject to suchfiling requirements for the past 90 days.OGE Energy Corp.☑Yes☐NoOklahoma Gas and Electric Company☑Yes☐No Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit suchfiles). OGE Energy Corp.☑Yes☐NoOklahoma Gas and Electric Company☑Yes☐No Indicate by check mark whether the registrant is a large acceleratedfiler, an acceleratedfiler, a non-acceleratedfiler, a smaller reporting company, or an emerging growth company.See the definitions of "large acceleratedfiler," "acceleratedfiler," "smaller reporting company" and "emerging growth company" in Rule 12b-2 of the Exchange Act. OGE Energy Corp.Large Accelerated Filer☑Accelerated Filer☐Non-accelerated Filer☐Smaller reporting company☐Emerging growthcompany☐Oklahoma Gas andElectric CompanyLarge Accelerated Filer☐Accelerated Filer☐Non-accelerated Filer☑Smaller reporting company☐Emerging growthcompany☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revisedfinancialaccounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ Indicate by check mark whether the registrant hasfiled a report on and attestation to its management's assessment of the effectiveness of its internal control overfinancial reportingunder Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accountingfirm that prepared or issued its audit report. OGE Energy Corp.☑Oklahoma Gas and Electric Company☑ If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether thefinancial statements of the registrant included in thefiling reflect the correction ofan error to previously issuedfinancial statements.☐Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant's executive officers during the relevant recovery period pursuant to §240.10D-1(b).☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). OGE Energy Corp.☐Yes☑NoOklahoma Gas and Electric Company☐Yes☑No At June 30, 2025, the last business day of OGE Energy Corp.'s most recently completed secondfiscal quarter, the aggregate market value of shares of common stock held by non-affiliates was $8,937,916,402 based on the number of shares held by non-affiliates (201,395,142) and the reported closing market price of the common stock on the New York StockExchange on such date of $44.38. At June 30, 2025, there was no voting or non-voting common equity of Oklahoma Gas and Electric Company held by non-affiliates. At January 31, 2026, there were 206,259,022 shares of OGE Energy Corp.'s common stock, par value $0.01 per share, outstanding. At January 31, 2026, there were 40,378,745 shares of Oklahoma Gas and Electric Company's common stock, par value $2.50 per share, outstanding, all of which were held by OGEEnergy Corp. There were no other shares of capital stock of the registrant outstanding at such date. DOCUMENTS INCORPORATED BY REFERENCEThe Proxy Statement for OGE Energy Corp.'s 2026 annual meeting of shareowners is incorporated by reference into Part III of this Form 10-K. This combined Form 10-K represents separatefilings by OGE Energy Corp. and Oklahoma Gas and Electric Company. Information contained herein related to an individual registrant is filed by such registrant on its own behalf. Oklahoma Gas and Electric Company makes no representations as to the information relating to OGE Energy Corp.'s other operations. Oklahoma Gas and Electric Company meets the conditions set forth in General Instruction I(1)(a) and (b) of Form 10-K and is thereforefiling this form with the reduced disclosureformat permitted by General Instruction I(2). FORM 10-K FOR THE YEAR ENDED DECEMBER 31, 2025 TABLE OF CONTENTSPageGLOSSARY OF TERMS3FILING FORMAT AND FORWARD-LOOKING STATEMENTS4Part IItem 1. Business6Item 1A. Risk Factors15Item 1