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Contents](#i379db4a35dfd4fdf8d9a48974b14319e_7)\n\nUNITED STATES\n\nSECURITIES AND EXCHANGE COMMISSION\n\nWashington, D.C. 20549\n\nFORM 10-K\n\n☒\nAnnual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934\n\nfor the fiscal year ended December 31, 2025\n\nOR\n\n☐Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934\nfor the transition period from           to\n\nCommission\nFile NumberExact name of registrant as specified in its charter;\nState of Incorporation;\nAddress and Telephone NumberIRS Employer\nIdentification No.\n\n1-14756Ameren Corporation43-1723446\n\n(Missouri Corporation)\n\n1901 Chouteau Avenue\n\nSt. Louis, Missouri 63103\n\n(314) 621-3222\n\n1-2967Union Electric Company43-0559760\n\n(Missouri Corporation)\n\n1901 Chouteau Avenue\n\nSt. Louis, Missouri 63103\n\n(314) 621-3222\n\n1-3672Ameren Illinois Company37-0211380\n\n(Illinois Corporation)\n\n10 Richard Mark Way\n\nCollinsville, Illinois 62234\n\n(618) 343-8150\n\nSecurities Registered Pursuant to Section 12(b) of the Act:\n\nTitle of each classTrading Symbol(s)Name of each exchange on which registered\n\nCommon Stock, $0.01 par value per shareAEENew York Stock Exchange\n\nSecurities Registered Pursuant to Section 12(g) of the Act:\n\nRegistrantTitle of each class\n\nUnion Electric CompanyPreferred Stock, cumulative, no par value, stated value $100 per share\n\nAmeren Illinois CompanyPreferred Stock, cumulative, $100 par value\n\n[Table](#i379db4a35dfd4fdf8d9a48974b14319e_7)[of Contents](#i379db4a35dfd4fdf8d9a48974b14319e_7)\n\nIndicate by check mark if each registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.\n\nAmeren CorporationYes☒No☐\n\nUnion Electric CompanyYes☒No☐\n\nAmeren Illinois CompanyYes☒No☐\n\nIndicate by check mark if each registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.\n\nAmeren CorporationYes☐No☒\n\nUnion Electric CompanyYes☐No☒\n\nAmeren Illinois CompanyYes☐No☒\n\nIndicate by check mark whether each registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.\n\nAmeren CorporationYes☒No☐\n\nUnion Electric CompanyYes☒No☐\n\nAmeren Illinois CompanyYes☒No☐\n\nIndicate by check mark whether each 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 such files).\n\nAmeren CorporationYes☒No☐\n\nUnion Electric CompanyYes☒No☐\n\nAmeren Illinois CompanyYes☒No☐\n\nIndicate by check mark whether each registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.\n\nAmeren CorporationLarge accelerated filer☒Accelerated filer☐Non-accelerated filer☐\n\nSmaller reporting company☐Emerging growth company☐\n\nUnion Electric CompanyLarge accelerated filer☐Accelerated filer☐Non-accelerated filer☒\n\nSmaller reporting company☐Emerging growth company☐\n\nAmeren Illinois CompanyLarge accelerated filer☐Accelerated filer☐Non-accelerated filer☒\n\nSmaller reporting company☐Emerging growth company☐\n\nIf 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 revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.\n\nAmeren Corporation☐\n\nUnion Electric Company☐\n\nAmeren Illinois Company☐\n\nIndicate by check mark whether each registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.\n\nAmeren Corporation☒\n\nUnion Electric Company☐\n\nAmeren Illinois Company☐\n\n[Table](#i379db4a35dfd4fdf8d9a48974b14319e_7)[of Contents](#i379db4a35dfd4fdf8d9a48974b14319e_7)\n\nIf securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements.\n\nAmeren Corporation☐\n\nUnion Electric Company☐\n\nAmeren Illinois Company☐\n\nIndicate 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).\n\nAmeren Corporation☐\n\nUnion Electric Company☐\n\nAmeren Illinois Company☐\n\nIndicate by check mark whether each registrant is a shell company (as defined in Rule 12b-2 of the Act).\n\nAmeren CorporationYes☐No☒\n\nUnion Electric CompanyYes☐No☒\n\nAmeren Illinois CompanyYes☐No☒\n\nAs of June 30, 2025, the aggregate market value of Ameren Corporation’s common stock, $0.01 par value, (based upon the closing price of the common stock on the New York Stock Exchange on June 30, 2025) held by nonaffiliates was $25,948,493,142. All of the shares of common stock of the other registrants were held by Ameren Corporation as of June 30, 2025.\n\nThe number of shares outstanding of each registrant’s classes of common stock as of January 30, 2026, were as follows:\n\nRegistrantTitle of each class of common stockShares\n\nAmeren CorporationCommon stock, $0.01 par value per share276,424,515 \n\nUnion Electric CompanyCommon stock, $5 par value per share, held by Ameren Corporation102,123,834 \n\nAmeren Illinois CompanyCommon stock, no par value, held by Ameren Corporation25,452,373 \n\nDOCUMENTS INCORPORATED BY REFERENCE\n\nPortions of the definitive proxy statement of Ameren Corporation and portions of the definitive information statements of Union Electric Company and Ameren Illinois Company for the 2026 annual meetings of shareholders are incorporated by reference into Part III of this Form 10-K.\n\nThis combined Form 10-K is separately filed by Ameren Corporation, Union Electric Company, and Ameren Illinois Company. Each registrant hereto is filing on its own behalf all of the information contained in this annual report that relates to such registrant. Each registrant hereto is not filing any information that does not relate to such registrant, and therefore makes no representation as to any such information.\n\n[Table](#i379db4a35dfd4fdf8d9a48974b14319e_7)[of Contents](#i379db4a35dfd4fdf8d9a48974b14319e_7)\n\nTABLE OF CONTENTS\n\nPage\n\n[GLOSSARY OF TERMS AND ABBREVIATIONS](#i379db4a35dfd4fdf8d9a48974b14319e_10)\n\n[1](#i379db4a35dfd4fdf8d9a48974b14319e_10)\n\n[FORWARD-LOOKING STATEMENTS](#i379db4a35dfd4fdf8d9a48974b14319e_13)\n\n[5](#i379db4a35dfd4fdf8d9a48974b14319e_13)\n\n[PART I](#i379db4a35dfd4fdf8d9a48974b14319e_16)"}