Company Update

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549     FORM 8-K     CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 1, 2019               Commission File Number   Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number   IRS Employer Identification Number           1-14756   Ameren Corporation ( Missouri Corporation) 1901 Chouteau Avenue St. Louis , Missouri 63103 (314) 621-3222   43-1723446           1-2967   Union Electric Company ( Missouri Corporation) 1901 Chouteau Avenue St. Louis , Missouri 63103 (314) 621-3222   43-0559760                                         Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrants under any of the following provisions:   ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)                                       ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)                                       ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))                                       ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))                                     Securities registered pursuant to Section 12(b) of the Act:           Title of each class   Trading Symbol(s)   Name of each exchange on which registered Common Stock, $0.01 par value per share   AEE   New York Stock Exchange                                     Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).                 Emerging Growth Company                   Ameren Corporation   ☐     Union Electric Company   ☐                                         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 revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.               Ameren Corporation   ☐     Union Electric Company   ☐                                                 ITEM 8.01 Other Events.                                     On October 1, 2019, Union Electric Company, doing business as Ameren Missouri (“Ameren Missouri”), a subsidiary of Ameren Corporation, sold $330 million principal amount of its 3.25% First Mortgage Bonds due 2049 (the “Bonds”). The Bonds were offered pursuant to a Registration Statement on Form S-3 (File No.  333-222108-02), which became effective on December 15, 2017, and a Prospectus Supplement dated September 23, 2019, to a Prospectus dated December 15, 2017. Ameren Missouri received net offering proceeds of approximately $326 million, before expenses, upon closing of the transaction. Ameren Missouri intends to use the net offering proceeds to repay at maturity $244.3 million aggregate principal amount of its 5.10% senior secured notes due October 1, 2019 and to repay a portion of its short-term debt. This Current Report on Form 8-K is being filed to report as exhibits certain documents in connection with the offering of the Bonds. ITEM 9.01 Financial Statements and Exhibits.               (d) Exhibits                       Exhibit Number     Title             1     Underwriting Agreement, dated September 23, 2019, between Ameren Missouri and the several underwriters named therein, for whom J.P. Morgan Securities LLC, SunTrust Robinson Humphrey, Inc., U.S. Bancorp Investments, Inc. and Wells Fargo Securities, LLC are acting as representatives.             4.1*     Indenture of Mortgage and Deed of Trust, dated June 15, 1937, from Ameren Missouri to The Bank of New York Mellon, as successor trustee, as amended May 1, 1941, and Second Supplemental Indenture dated May 1, 1941 (Exhibit B-1, File No. 2-4940).(P)             4.2     Supplemental Indenture, dated September 15, 2019, by and between Ameren Missouri and The Bank of New York Mellon, as successor trustee, relating to the 3.25% First Mortgage Bonds due 2049.             5.1     Opinion of Craig W. Stensland, Esq., Senior Corporate Counsel, Ameren Services Company, regarding the legality of the Bonds (including consent).             5.2     Opinion of Morgan, Lewis & Bockius LLP regarding the legality of the Bonds (including consent).             104     Cover Page Interactive Data File (formatted as Inline XBRL).                           * Incorporated by reference as indicated.             This combined Form 8-K is being filed separately by Ameren Corporation and Union Electric Company (each a “registrant”). Information contained herein relating to any individual registrant has been filed by such registrant on its own behalf. No registrant makes any representation as to information relating to any other registrant.   - 2 -    SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, each registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. The signature for each undersigned company shall be deemed to relate only to matters having reference to such company or its subsidiaries.       AMEREN CORPORATION (Registrant)       By:   /s/ Martin J. Lyons, Jr. Name:   Martin J. Lyons, Jr. Title:   Executive Vice President and Chief Financial Officer   UNION ELECTRIC COMPANY (Registrant)       By:   /s/ Michael L. Moehn Name:   Michael L. Moehn Title:   Chairman and President                                     Date: October 1, 2019