{"url_path":"/sec/aee/8-k/2026-02-27/cover-page","section_key":"cover-page","section_title":"Cover Page","topic":"sec","document":{"doc_type":"8-K","doc_date":"2026-02-27","source_url":"https://www.sec.gov/Archives/edgar/data/1002910/0001104659-26-021486-index.html","accession_number":"0001104659-26-021486","cik":"0001002910","ticker":"AEE","issuer_name":"AMEREN CORP","edgar_url":"https://www.sec.gov/Archives/edgar/data/1002910/0001104659-26-021486-index.html","primary_entity_key":"0001002910","primary_entity_name":"AMEREN CORP"},"word_count":363,"has_tables":true,"body_markdown":"false\n0001002910\n0000100826\nfalse\n8-K\n2026-02-27\nfalse\nfalse\nfalse\nfalse\nfalse\n\n0001002910\n\n2026-02-27\n2026-02-27\n\n0001002910\n\nAEE:UnionElectricCompanyMember\n\n2026-02-27\n2026-02-27\n\niso4217:USD\n\nxbrli:shares\n\niso4217:USD\n\nxbrli:shares\n\n** **\n\n \n\n** **\n\n**UNITED STATES**\n\n**SECURITIES AND EXCHANGE COMMISSION**\n\n**Washington, D.C. 20549**\n\n \n\n \n\n \n\n**FORM 8-K**\n\n \n\n \n\n \n\n**CURRENT REPORT**\n\n**Pursuant to Section 13 or 15(d) of\nthe\nSecurities Exchange Act of 1934**\n\n \n\n**Date of report (Date of earliest event reported): February 27, 2026**\n\n   \n\n \n\n \n\n**Commission File Number**\n\n \n\n**Exact\nName of Registrant as\nSpecified in Charter;**\n\n**State of Incorporation;**\n\n**Address and Telephone Number**\n\n \n\n**IRS Employer**\n\n**Identification Number**\n\n \n\n**1-14756**\n\n \n\n \n\n**Ameren\nCorporation**\n\n**(Missouri****Corporation)**\n\n**1901\nChouteau Avenue**\n\n**St.\nLouis****, Missouri****63103**\n\n**(314****)\n621-3222**\n\n** **\n\n \n\n \n\n**43-1723446**\n\n**1-2967**\n \n\n**Union Electric Company**\n\n**(Missouri****Corporation)**\n\n**1901 Chouteau Avenue**\n\n**St. Louis****, Missouri** **63103**\n\n**(314****)\n621-3222**\n\n \n**43-0559760**\n\n \n\nCheck\nthe appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrants\nunder any of the following provisions:\n\n¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)\n\n¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)\n\n¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))\n\n¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))\n\n \n\nSecurities registered\npursuant to Section 12(b) of the Act:\n\n \n\nTitle\nof each class\n\n \n\nTrading\nSymbol(s)\n\n \n\nName\nof each exchange on which registered\n\nCommon\nStock, $0.01 par value per share\n\n \n\nAEE\n\n \n\nNew\nYork Stock Exchange\n\n \n\nIndicate by check mark whether the registrant\nis an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2\nof the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).\n\n \n\n \nEmerging growth company\n \n\nAmeren Corporation\n¨\n \n\nUnion Electric Company\n\n¨\n \n\n \n\nIf\nan emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying\nwith any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.\n\n \n\nAmeren Corporation\n¨\n \n\nUnion Electric Company\n\n¨\n \n\n \n\n \n\nCo-Registrant\nCIK\n0000100826\n\nCo-Registrant\nAmendment Flag\nfalse\n\nCo-Registrant\nForm Type\n8-K\n\nCo-Registrant\nDocumentperiodEndDate\n2026-02-27\n\nCo-Registrant\nWritten Commuunications\nfalse\n\nCo-Registrant\nSolicitating Materials\nfalse\n\nCo-Registrant\nPreCommencement Tender Offer\nfalse\n\nCo-Registrant\nPreCommencement Tender Offer\nfalse\n\nCo-Registrant\nEntity PreCommencement Issuer Tender Offer\nfalse"}