UEPCN / Union Electric Company - Preferred Stock - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Union Electric Company - Preferred Stock
US ˙ OTCPK

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LEI QMPJLLDULY5C1M8PNY21
CIK 100826
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Union Electric Company - Preferred Stock
SEC Filings (Chronological Order)
Halaman ini menyediakan daftar lengkap dan kronologis dari Pengajuan SEC, tidak termasuk pengajuan kepemilikan yang kami sediakan di tempat lain.
August 4, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended June 30, 2025 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact name of

May 12, 2025 8-K

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): May 8, 2025

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): May 8, 2025 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-14756 Am

May 5, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended March 31, 2025 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact name of

April 4, 2025 EX-4.2

SUPPLEMENTAL INDENTURE DATED MARCH 1, 2025 UNION ELECTRIC COMPANY THE BANK OF NEW YORK MELLON, AS TRUSTEE (SUPPLEMENTAL TO THE INDENTURE OF MORTGAGE AND DEED OF TRUST DATED JUNE 15, 1937, AS AMENDED, EXECUTED BY UNION ELECTRIC COMPANY TO THE BANK OF

Exhibit 4.2 SUPPLEMENTAL INDENTURE DATED MARCH 1, 2025 UNION ELECTRIC COMPANY TO THE BANK OF NEW YORK MELLON, AS TRUSTEE (SUPPLEMENTAL TO THE INDENTURE OF MORTGAGE AND DEED OF TRUST DATED JUNE 15, 1937, AS AMENDED, EXECUTED BY UNION ELECTRIC COMPANY TO THE BANK OF NEW YORK MELLON, AS TRUSTEE) 5.25% First Mortgage Bonds due 2035 This instrument was prepared by Stephen C. Lee, Esq., Vice President,

April 4, 2025 8-K

Current Report

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): April 4, 2025 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-14756

April 4, 2025 EX-1

Union Electric Company First Mortgage Bonds due 2035 Underwriting Agreement

Exhibit 1 Union Electric Company First Mortgage Bonds due 2035 Underwriting Agreement March 26, 2025 Goldman Sachs & Co.

March 27, 2025 EX-FILING FEES

Calculation of Filing Fee Tables (1) Form 424(b)(2) (Form Type) Union Electric Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Tables (1) Form 424(b)(2) (Form Type) Union Electric Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt Union Electric Company’s 5.

March 27, 2025 424B2

$500,000,000 5.25% First Mortgage Bonds due 2035

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(2)  Registration Statement No. 333-274977-02 PROSPECTUS SUPPLEMENT (To Prospectus dated October 13, 2023) $500,000,000 5.25% First Mortgage Bonds due 2035 Union Electric Company, doing business as Ameren Missouri, is offering $500,000,000 principal amount of its 5.25% First Mortgage Bonds due 2035, referred to in this prospectus supplement as the “b

March 26, 2025 FWP

Union Electric Company Pricing Term Sheet March 26, 2025

Filed Pursuant to Rule 433 Registration Statement No. 333-274977-02 Union Electric Company Pricing Term Sheet March 26, 2025 Issue: 5.25% First Mortgage Bonds due 2035 Principal Amount: $500,000,000 Coupon (Interest Rate): 5.25% per annum Maturity Date: April 15, 2035 Benchmark Treasury: 4.625% due February 15, 2035 Benchmark Treasury Price: 102-10+ Benchmark Treasury Yield: 4.333% Spread to Bench

March 26, 2025 424B3

SUBJECT TO COMPLETION, DATED MARCH 26, 2025

TABLE OF CONTENTS The information contained in this preliminary prospectus supplement is not complete and may be changed.

March 25, 2025 DEFA14C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14C INFORMATION Information Statement Pursuant to Section 14(c) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14C INFORMATION Information Statement Pursuant to Section 14(c) of the Securities Exchange Act of 1934 (Amendment No. ) Check the appropriate box: ¨ Preliminary Information Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14c-5(d)(2)) ¨ Definitive Information Statement x Definitive Additi

March 25, 2025 DEF 14C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14C INFORMATION Information Statement Pursuant to Section 14(c) of the Securities Exchange Act of 1934 (Amendment No.      )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14C INFORMATION Information Statement Pursuant to Section 14(c) of the Securities Exchange Act of 1934 (Amendment No.      ) Check the appropriate box: ☐ Preliminary Information Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14c-5(d)(2)) ☒ Definitive Information Statem

March 3, 2025 8-K

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): February 26, 2025

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): February 26, 2025 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-14

February 18, 2025 EX-24.1

POWER OF ATTORNEY

Exhibit 24.1 POWER OF ATTORNEY WHEREAS, AMEREN CORPORATION, a Missouri corporation (herein referred to as the "Company"), is required to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, its annual report on Form 10-K for the year ended December 31, 2024; and WHEREAS, each of the individuals identified below is a director of

February 18, 2025 EX-10.49

RSU CEO Award

RSU CEO Award 90286995v.6 Exhibit 10.49 2025 Restricted Stock Unit Award Agreement 59961097v.2 90286995v.6 Notice of 2025 Restricted Stock Unit Award Participant: Grant Date: You have been granted the following Restricted Stock Units in accordance with the terms of the Ameren Corporation 2022 Omnibus Incentive Compensation Plan (as the same may be amended from time to time, the "Plan") and the att

February 18, 2025 EX-19.1

Ameren Corporation Insider Trading Policy

Exhibit 19.1 Ameren Corporation Insider Trading Policy I.Purpose Ameren Corporation (including its direct and indirect subsidiaries, “Ameren” or the “Company”) has adopted this Insider Trading Policy (this “Policy”) to promote compliance with applicable laws that prohibit certain persons who are aware of Material Nonpublic Information (as defined below) about a company from: (i) trading in securit

February 18, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the fiscal year ended December 31, 2024 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact name of regi

February 18, 2025 EX-10.47

PSU Award - TSR

PSU Award - TSR Exhibit 10.47 2025 Performance Share Unit Award Agreement Notice of 2025 Performance Share Unit Award (TSR) Participant: Grant Date: You have been granted the following Performance Share Units in accordance with the terms of the Ameren Corporation 2022 Omnibus Incentive Compensation Plan (as the same may be amended from time to time, the "Plan") and the attached award agreement, re

February 18, 2025 EX-10.19

2025 BASE SALARY TABLE FOR NAMED EXECUTIVE OFFICERS

Exhibit 10.19 2025 BASE SALARY TABLE FOR NAMED EXECUTIVE OFFICERS The 2025 annual base salaries of the following Named Executive Officers of Ameren Corporation (“Ameren”), Union Electric Company (“UE”) and Ameren Illinois Company (“AIC”) (which officers are employed by Ameren and/or an Ameren subsidiary as of February 18, 2025, and were determined to the extent applicable by reference to the Amere

February 18, 2025 EX-10.22

SCHEDULE I CHANGE OF CONTROL SEVERANCE PLAN PARTICIPANTS EFFECTIVE DECEMBER 13, 2024

Exhibit 10.22 SCHEDULE I CHANGE OF CONTROL SEVERANCE PLAN PARTICIPANTS EFFECTIVE DECEMBER 13, 2024 Benefit Level1 - 3 Birk, Mark C. Moehn, Michael Diya, Fadi Nwamu, Chonda * Lyons, Martin J. Singh, Leonard * Benefit Level1 - 2 Schukar, Shawn E. * Not eligible for excise tax gross-up provisions (for new officers effective on or after October 1, 2009) 1 Severance benefits include: •Cash severance, d

February 18, 2025 EX-10.48

PSU Award- Clean Energy Metric

PSU Award- Clean Energy Metric 305903566v.2 Exhibit 10.48 2025 Performance Share Unit Award Agreement Notice of 2025 Performance Share Unit Award (Clean Energy Transition) Participant: Grant Date: You have been granted the following Performance Share Units in accordance with the terms of the Ameren Corporation 2022 Omnibus Incentive Compensation Plan (as the same may be amended from time to time,

February 18, 2025 EX-24.2

POWER OF ATTORNEY

Exhibit 24.2 POWER OF ATTORNEY WHEREAS, UNION ELECTRIC COMPANY, a Missouri corporation (herein referred to as the "Company"), is required to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, its annual report on Form 10-K for the year ended December 31, 2024; and WHEREAS, each of the individuals identified below is a director

February 18, 2025 EX-24.3

POWER OF ATTORNEY

Exhibit 24.3 POWER OF ATTORNEY WHEREAS, AMEREN ILLINOIS COMPANY, an Illinois corporation (herein referred to as the "Company"), is required to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, its annual report on Form 10-K for the year ended December 31, 2024; and WHEREAS, each of the individuals identified below is a direct

February 18, 2025 EX-10.15

2025 Ameren Short-Term Incentive Plan Plan Summary Effective January 1, 2025

EXHIBIT 10.15 2025 Ameren Short-Term Incentive Plan Plan Summary Effective January 1, 2025 1 EXHIBIT 10.15 2 EXHIBIT 10.15 Summary The Ameren Short-Term Incentive Plan (“STIP”) is intended to reward eligible Officers for their contributions to Ameren’s success. The STIP rewards Officers for results in the following categories: financial performance, safety, operational performance, customer, econo

February 18, 2025 EX-10.29

FORMULA FOR DETERMINING 2025 TARGET PSU AND RSU AWARDS FORMULA FOR DETERMINING 2025 TARGET PERFORMANCE SHARE UNIT ("PSU") AND RESTRICTED STOCK UNIT ("RSU") AWARDS TO BE ISSUED TO NAMED EXECUTIVE OFFICERS

Exhibit 10.29 FORMULA FOR DETERMINING 2025 TARGET PSU AND RSU AWARDS FORMULA FOR DETERMINING 2025 TARGET PERFORMANCE SHARE UNIT ("PSU") AND RESTRICTED STOCK UNIT ("RSU") AWARDS TO BE ISSUED TO NAMED EXECUTIVE OFFICERS The target number of PSUs and RSUs to be issued to each Named Executive Officer listed below for 2025 will be determined in accordance with the following formula: 2025 Target Number

February 18, 2025 EX-21.1

SUBSIDIARIES OF AMEREN CORPORATION AT DECEMBER 31, 2024 Name State or Jurisdiction of Organization Ameren Corporation Missouri Ameren Development Company Missouri Missouri Central Railroad Company Delaware QST Enterprises Inc. Illinois Ameren EIP Inv

Exhibit 21.1 SUBSIDIARIES OF AMEREN CORPORATION AT DECEMBER 31, 2024 Name State or Jurisdiction of Organization Ameren Corporation Missouri Ameren Development Company Missouri Missouri Central Railroad Company Delaware QST Enterprises Inc. Illinois Ameren EIP Investment, LLC Delaware Ameren Accelerator Investments, LLC Delaware AmerenEnergy Medina Valley Cogen, L.L.C. Illinois Ameren Transmission

December 20, 2024 EX-10.2

  SECURITIZED UTILITY TARIFF PROPERTY PURCHASE AND SALE AGREEMENT by and between AMeren missouri securitization funding i, llc, as Issuer union electric company d/b/a ameren missouri, as Seller Dated as of December 20, 2024

  Exhibit 10.2   SECURITIZED UTILITY TARIFF PROPERTY PURCHASE AND SALE AGREEMENT   by and between   AMeren missouri securitization funding i, llc,   as Issuer   and   union electric company d/b/a ameren missouri,   as Seller   Dated as of December 20, 2024         TABLE OF CONTENTS     Page     ARTICLE I DEFINITIONS 1 SECTION 1.01. Definitions 1 SECTION 1.02. Other Definitional Provisions 2     AR

December 20, 2024 EX-4.1

AMEREN MISSOURI SECURITIZATION FUNDING I, LLC, THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Indenture Trustee and Securities Intermediary Dated as of December 20, 2024 TABLE OF CONTENTS

Exhibit 4.1 AMEREN MISSOURI SECURITIZATION FUNDING I, LLC, Issuer, and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Indenture Trustee and Securities Intermediary INDENTURE Dated as of December 20, 2024 TABLE OF CONTENTS ARTICLE I Definitions and Incorporation by Reference      2 SECTION 1.01. Definitions 2 SECTION 1.02. Incorporation by Reference of Trust Indenture Act 2 SECTION 1.03. Rules

December 20, 2024 EX-99.2

SCHEDULE A Goldman Sachs & Co. LLC 200 West Street New York, New York 10282 RBC Capital Markets, LLC Brookfield Place 200 Vesey Street, 9th Floor New York, New York 10281 As Representatives of the Underwriters Union Electric Company, d/b/a Ameren Mis

Exhibit 99.2 December 20, 2024 Page 1 Dentons US LLP 4520 Main Street Suite 1100 Kansas City, MO 64111-7700 United States dentons.com December 20, 2024 To Each of the Parties Listed on the Attached Schedule A Opinion: Missouri Constitutional Law Ameren Missouri Securitization Funding I, LLC Greetings: We have acted as Missouri counsel to Union Electric Company d/b/a/ Ameren Missouri, a Missouri co

December 20, 2024 EX-4.2

SERIES SUPPLEMENT

Exhibit 4.2 SERIES SUPPLEMENT This SERIES SUPPLEMENT dated as of December 20, 2024 (this “Supplement”), by and between AMEREN MISSOURI Securitization funding i, llc, a Delaware limited liability company (the “Issuer”), and The Bank of New York Mellon Trust Company, N.A., a national banking association (“BANK”), in its capacity as indenture trustee (the “Indenture Trustee”) for the benefit of the S

December 20, 2024 EX-10.3

ADMINISTRATION AGREEMENT

Exhibit 10.3 ADMINISTRATION AGREEMENT This ADMINISTRATION AGREEMENT, dated as of December 20, 2024 (this “Administration Agreement”), by and between UNION ELECTRIC COMPANY d/b/a Ameren missouri, a Missouri corporation (“Ameren Missouri”), as administrator (in such capacity, the “Administrator”), and Ameren missouri SEcuritization funding i, llC, a Delaware limited liability company (the “Issuer”).

December 20, 2024 8-K

Current Report

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): December 20, 2024 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 333-

December 20, 2024 EX-10.1

SECURITIZED UTILITY TARIFF PROPERTY SERVICING AGREEMENT by and between Ameren Missouri Securitization funding i, LLC, UNION ELECTRIC COMPANY D/B/A AMEREN MISSOURI, Acknowledged and Accepted by THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Inden

Exhibit 10.1 SECURITIZED UTILITY TARIFF PROPERTY SERVICING AGREEMENT by and between Ameren Missouri Securitization funding i, LLC, Issuer and UNION ELECTRIC COMPANY D/B/A AMEREN MISSOURI, Servicer Acknowledged and Accepted by THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Indenture Trustee Dated as of December 20, 2024 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS     1 SECTION 1.01. Definitio

December 20, 2024 EX-99.1

QUESTIONS PRESENTED

Exhibit 99.1 December 20, 2024 To the Persons Listed on the Attached Schedule I Re: Federal Constitutional Issues related to Union Electric Company d/b/a Ameren Missouri Securitized Utility Tariff Bonds Opinion Recipients: We have served as counsel to Union Electric Company d/b/a Ameren Missouri, a Missouri corporation (“Ameren Missouri”), in connection with the issuance and sale on the date hereo

December 12, 2024 EX-10.3

ADMINISTRATION AGREEMENT

Exhibit 10.3 ADMINISTRATION AGREEMENT This ADMINISTRATION AGREEMENT, dated as of December 20, 2024 (this “Administration Agreement”), by and between UNION ELECTRIC COMPANY d/b/a Ameren missouri, a Missouri corporation (“Ameren Missouri”), as administrator (in such capacity, the “Administrator”), and Ameren missouri SEcuritization funding i, llC, a Delaware limited liability company (the “Issuer”).

December 12, 2024 424B1

$476,121,000 Securitized Utility Tariff Bonds, Series 2024-A Union Electric Company Sponsor, Depositor and Initial Servicer Central Index Key Number: 0000100826 Ameren Missouri Securitization Funding I, LLC Issuing Entity Central Index Key Number: 00

TABLE OF CONTENTS   Filed Pursuant to Rule 424(b)(1)   Registration Statement No. 333-282616 and 333-282616-1 PROSPECTUS $476,121,000 Securitized Utility Tariff Bonds, Series 2024-A Union Electric Company Sponsor, Depositor and Initial Servicer Central Index Key Number: 0000100826 Ameren Missouri Securitization Funding I, LLC Issuing Entity Central Index Key Number: 0002039835 Tranche Expected Wei

December 12, 2024 EX-10.1

SECURITIZED UTILITY TARIFF PROPERTY SERVICING AGREEMENT by and between Ameren Missouri Securitization funding i, LLC, UNION ELECTRIC COMPANY D/B/A AMEREN MISSOURI, Acknowledged and Accepted by THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Inden

Exhibit 10.1 SECURITIZED UTILITY TARIFF PROPERTY SERVICING AGREEMENT by and between Ameren Missouri Securitization funding i, LLC, Issuer and UNION ELECTRIC COMPANY D/B/A AMEREN MISSOURI, Servicer Acknowledged and Accepted by THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Indenture Trustee Dated as of December 20, 2024 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS     1 SECTION 1.01. Definitio

December 12, 2024 EX-10.2

  SECURITIZED UTILITY TARIFF PROPERTY PURCHASE AND SALE AGREEMENT by and between AMeren missouri securitization funding i, llc, as Issuer union electric company d/b/a ameren missouri, as Seller Dated as of December 20, 2024

  Exhibit 10.2   SECURITIZED UTILITY TARIFF PROPERTY PURCHASE AND SALE AGREEMENT   by and between   AMeren missouri securitization funding i, llc,   as Issuer   and   union electric company d/b/a ameren missouri,   as Seller   Dated as of December 20, 2024         TABLE OF CONTENTS     Page     ARTICLE I DEFINITIONS 1 SECTION 1.01. Definitions 1 SECTION 1.02. Other Definitional Provisions 2     AR

December 12, 2024 EX-4.2

SERIES SUPPLEMENT

Exhibit 4.2 SERIES SUPPLEMENT This SERIES SUPPLEMENT dated as of December 20, 2024 (this “Supplement”), by and between AMEREN MISSOURI Securitization funding i, llc, a Delaware limited liability company (the “Issuer”), and The Bank of New York Mellon Trust Company, N.A., a national banking association (“BANK”), in its capacity as indenture trustee (the “Indenture Trustee”) for the benefit of the S

December 12, 2024 EX-1.1

AMEREN MISSOURI SECURITIZATION FUNDING I, LLC UNION ELECTRIC COMPANY $476,121,000 Securitized Utility Tariff Bonds, Series 2024-A UNDERWRITING AGREEMENT

Exhibit 1.1 Execution Version AMEREN MISSOURI SECURITIZATION FUNDING I, LLC UNION ELECTRIC COMPANY $476,121,000 Securitized Utility Tariff Bonds, Series 2024-A UNDERWRITING AGREEMENT December 10, 2024 To the Representatives named in Schedule I hereto of the Underwriters named in Schedule II hereto Ladies and Gentlemen: 1.            Introduction. Ameren Missouri Securitization Funding I, LLC, a De

December 12, 2024 EX-3.2

AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT AMEREN MISSOURI SECURITIZATION FUNDING I, LLC Dated as of December 10, 2024 TABLE OF CONTENTS

Exhibit 3.2 AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF AMEREN MISSOURI SECURITIZATION FUNDING I, LLC Dated as of December 10, 2024 TABLE OF CONTENTS Page ARTICLE I GENERAL PROVISIONS SECTION 1.01 Definitions 1 SECTION 1.02 Sole Member; Registered Office and Agent 2 SECTION 1.03 Other Offices 3 SECTION 1.04 Name 3 SECTION 1.05 Purpose; Nature of Business Permitted; Powers 3 SECTION

December 12, 2024 8-K

Current Report

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): December 10, 2024 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 333-

December 12, 2024 EX-4.1

AMEREN MISSOURI SECURITIZATION FUNDING I, LLC, THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Indenture Trustee and Securities Intermediary Dated as of December 20, 2024 TABLE OF CONTENTS

Exhibit 4.1 AMEREN MISSOURI SECURITIZATION FUNDING I, LLC, Issuer, and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Indenture Trustee and Securities Intermediary INDENTURE Dated as of December 20, 2024 TABLE OF CONTENTS ARTICLE I Definitions and Incorporation by Reference      2 SECTION 1.01. Definitions 2 SECTION 1.02. Incorporation by Reference of Trust Indenture Act 2 SECTION 1.03. Rules

December 11, 2024 FWP

Ameren Missouri Securitization Funding I, LLC (Issuing Entity) Pricing TERM SHEET $476,121,000 Securitized Utility Tariff Bonds, Series 2024-A

Free Writing Prospectus, dated December 10, 2024 Filed pursuant to Rule 433 under the Securities Act of 1933 Supplementing the Preliminary Prospectus, dated November 15, 2024 Registration Statement Nos.

December 4, 2024 CORRESP

Remainder of the page intentionally left blank

December 4, 2024 VIA EDGAR Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.

December 4, 2024 FWP

Ameren Missouri Securitization Funding I, LLC (Issuing Entity) Preliminary TERM SHEET $476,121,000 Securitized Utility Tariff Bonds, Series 2024-A

Free Writing Prospectus, dated December 4, 2024 Filed pursuant to Rule 433 under the Securities Act of 1933 Supplementing the Preliminary Prospectus, dated November 15, 2024 Registration Statement Nos.

December 4, 2024 CORRESP

Union Electric Company 1901 Chouteau Avenue St. Louis, Missouri 63103

Union Electric Company 1901 Chouteau Avenue St. Louis, Missouri 63103 December 4, 2024 Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549 Attention: Komul Chaundhry, Office of Structured Finance Arthur Sandel, Office of Structured Finance Re: Union Electric Company Ameren Missouri Securitization Funding I, LLC Registration Statement on Form

November 15, 2024 CORRESP

Hunton Andrews Kurth LLP

Hunton Andrews Kurth LLP 200 Park Avenue New York, NY 10166-0005 Tel 212 • 309 • 1000 Fax 212 • 309 • 1100 November 15, 2024 Via Edgar and Electronic Mail Ms.

November 15, 2024 EX-FILING FEES

Calculation of Filing Fee Table Form SF-1 (Form Type)

Exhibit 107.1 Calculation of Filing Fee Table Form SF-1 (Form Type) Union Electric Company (Exact name of registrant, sponsor and depositor as specified in its charter) Ameren Missouri Securitization Funding I, LLC (Exact name of registrant and issuing entity as specified in its charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered

November 15, 2024 EX-99.3

Dentons US LLP

Exhibit 99.3 Dentons US LLP 4520 Main Street Suite 1100 Kansas City, MO 64111-7700 United States dentons.com December , 2024 To Each of the Parties Listed on the Attached Opinion: Missouri Constitutional Law Ameren Missouri Securitization Funding I, LLC Greetings: We have acted as Missouri counsel to Union Electric Company d/b/a/ Ameren Missouri, a Missouri corporation, (the “Sponsor”) and Ameren

November 15, 2024 EX-10.2

  SECURITIZED UTILITY TARIFF PROPERTY PURCHASE AND SALE AGREEMENT by and between AMeren missouri securitization funding i, llc, as Issuer union electric company d/b/a ameren missouri, as Seller Dated as of [Closing Date], 2024

  Exhibit 10.2   SECURITIZED UTILITY TARIFF PROPERTY PURCHASE AND SALE AGREEMENT   by and between   AMeren missouri securitization funding i, llc,   as Issuer   and   union electric company d/b/a ameren missouri,   as Seller   Dated as of [Closing Date], 2024         TABLE OF CONTENTS     Page     ARTICLE I DEFINITIONS 1 SECTION 1.01. Definitions 1 SECTION 1.02. Other Definitional Provisions 2    

November 15, 2024 EX-99.2

QUESTIONS PRESENTED

Exhibit 99.2 [date], 2024 To the Persons Listed on the Attached Schedule I Re: Federal Constitutional Issues related to Union Electric Company d/b/a Ameren Missouri Securitized Utility Tariff Bonds Opinion Recipients: We have served as counsel to Union Electric Company d/b/a Ameren Missouri, a Missouri corporation (“Ameren Missouri”), in connection with the issuance and sale on the date hereof by

November 15, 2024 SF-1/A

As filed with the Securities and Exchange Commission on November 15, 2024

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on November 15, 2024 REGISTRATION NOS.

November 15, 2024 EX-99.4

Consent of Independent Manager Nominee

Exhibit 99.4 Consent of Independent Manager Nominee Union Electric Company and Ameren Missouri Securitization Funding I, LLC are filing a Registration Statement on Form SF-1 (the “Registration Statement”) with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Securities Act”), in connection with the public offering of securitized utility tariff bonds. In con

November 15, 2024 EX-1.1

AMEREN MISSOURI SECURITIZATION FUNDING I, LLC UNION ELECTRIC COMPANY $[______] Securitized Utility Tariff Bonds, Series 2024-A UNDERWRITING AGREEMENT

Exhibit 1.1 AMEREN MISSOURI SECURITIZATION FUNDING I, LLC UNION ELECTRIC COMPANY $[] Securitized Utility Tariff Bonds, Series 2024-A UNDERWRITING AGREEMENT [], 2024 To the Underwriters named in Schedule I hereto Ladies and Gentlemen: 1.            Introduction. Ameren Missouri Securitization Funding I, LLC, a Delaware limited liability company (the “Issuer”), proposes to issue and sell $[] aggrega

November 7, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended September 30, 2024 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact nam

November 7, 2024 EX-4.1

Ameren Transmission Company of Illinois $70,000,000 5.17% Senior Notes, Series A, due September 1, 2039 $70,000,000 5.42% Senior Notes, Series B, due September 1, 2053 Note Purchase Agreement Dated as of August 30, 2024 Table of Contents

Exhibit 4.1 Execution Version Ameren Transmission Company of Illinois $140,000,000 $70,000,000 5.17% Senior Notes, Series A, due September 1, 2039 and $70,000,000 5.42% Senior Notes, Series B, due September 1, 2053 Note Purchase Agreement Dated as of August 30, 2024 Table of Contents Section Heading Page Section 2. Sale and Purchase of Notes 1 Section 3. Closing 2 Section 4. Conditions to Closing

October 28, 2024 EX-10.2

SECURITIZED UTILITY TARIFF PROPERTY PURCHASE AND SALE AGREEMENT by and between AMeren missouri securitization funding i, llc, as Issuer union electric company d/b/a ameren missouri, as Seller Dated as of [Closing Date], 2024

Exhibit 10.2 SECURITIZED UTILITY TARIFF PROPERTY PURCHASE AND SALE AGREEMENT by and between AMeren missouri securitization funding i, llc, as Issuer and union electric company d/b/a ameren missouri, as Seller Dated as of [Closing Date], 2024 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS 1 SECTION 1.01. Definitions 1 SECTION 1.02. Other Definitional Provisions 2 ARTICLE II CONVEYANCE OF SECURITIZED

October 28, 2024 SF-1/A

As filed with the Securities and Exchange Commission on October 28, 2024

As filed with the Securities and Exchange Commission on October 28, 2024 REGISTRATION NOS.

October 28, 2024 EX-10.3

ADMINISTRATION AGREEMENT

Exhibit 10.3 ADMINISTRATION AGREEMENT This ADMINISTRATION AGREEMENT, dated as of [Closing Date], 2024 (this “Administration Agreement”), by and between UNION ELECTRIC COMPANY d/b/a Ameren missouri, a Missouri corporation (“Ameren Missouri”), as administrator (in such capacity, the “Administrator”), and Ameren missouri SEcuritization funding i, llC, a Delaware limited liability company (the “Issuer

October 28, 2024 EX-10.1

SECURITIZED UTILITY TARIFF PROPERTY SERVICING AGREEMENT by and between Ameren Missouri Securitization funding i, LLC, UNION ELECTRIC COMPANY D/B/A AMEREN MISSOURI, Acknowledged and Accepted by THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Inden

Exhibit 10.1 SECURITIZED UTILITY TARIFF PROPERTY SERVICING AGREEMENT by and between Ameren Missouri Securitization funding i, LLC, Issuer and UNION ELECTRIC COMPANY D/B/A AMEREN MISSOURI, Servicer Acknowledged and Accepted by THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Indenture Trustee Dated as of [Closing Date], 2024 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS     1 SECTION 1.01. Defini

October 28, 2024 EX-3.2

Form of Amended and Restated Limited Liability Company Agreement of Ameren Missouri Securitization Funding I, LLC**

Exhibit 3.2 AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF AMEREN MISSOURI SECURITIZATION FUNDING I, LLC Dated as of [ ], 2024 TABLE OF CONTENTS Page ARTICLE I GENERAL PROVISIONS SECTION 1.01 Definitions 1 SECTION 1.02 Sole Member; Registered Office and Agent 2 SECTION 1.03 Other Offices 3 SECTION 1.04 Name 3 SECTION 1.05 Purpose; Nature of Business Permitted; Powers 3 SECTION 1.06 Li

October 28, 2024 EX-4.1

AMEREN MISSOURI SECURITIZATION FUNDING I, LLC, THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Indenture Trustee and Securities Intermediary Dated as of [Closing Date], 2024 TABLE OF CONTENTS

Exhibit 4.1 AMEREN MISSOURI SECURITIZATION FUNDING I, LLC, Issuer, and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Indenture Trustee and Securities Intermediary INDENTURE Dated as of [Closing Date], 2024 TABLE OF CONTENTS ARTICLE I Definitions and Incorporation by Reference      2 SECTION 1.01. Definitions 2 SECTION 1.02. Incorporation by Reference of Trust Indenture Act 2 SECTION 1.03. Ru

October 11, 2024 EX-FILING FEES

Calculation of Filing Fee Table Form SF-1 (Form Type)

Exhibit 107.1 Calculation of Filing Fee Table Form SF-1 (Form Type) Union Electric Company (Exact name of registrant, sponsor and depositor as specified in its charter) Ameren Missouri Securitization Funding I, LLC (Exact name of registrant and issuing entity as specified in its charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered

October 11, 2024 SF-1

As filed with the Securities and Exchange Commission on October 11, 2024

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on October 11, 2024 REGISTRATION NOS.

October 11, 2024 EX-25.1

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTE

Exhibit 25.1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) ¨ THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. (Exact name of trustee as specified in its charter) (Ju

October 11, 2024 EX-21.1

List of Subsidiaries*

Exhibit 21.1 Subsidiaries of Union Electric Company Name of Subsidiary Jurisdiction of Formation of Subsidiary Ameren Missouri Securitization Funding I, LLC Delaware Ameren Missouri Renewables Holdco, LLC Delaware BREC Holding Company, LLC Delaware HFREC Holding Company, LLC Delaware STARS Alliance, LLC (25% interest) Delaware

October 11, 2024 EX-99.1

Financing Order*

Exhibit 99.1 STATE OF MISSOURI PUBLIC SERVICE COMMISSION At a session of the Public Service Commission held at its office in Jefferson City on the 7th day of August, 2024. BEFORE THE PUBLIC SERVICE COMMISSION OF THE STATE OF MISSOURI In the Matter of the Petition of Union Electric ) Company d/b/a Ameren Missouri for a ) Financing Order Authorizing the Issue of ) File No. EF-2024-0021 Securitized U

October 11, 2024 EX-3.1

CERTIFICATE OF FORMATION AMEREN MISSOURI SECURITIZATION FUNDING I, LLC

Exhibit 3.1 CERTIFICATE OF FORMATION OF AMEREN MISSOURI SECURITIZATION FUNDING I, LLC This Certificate of Formation of Ameren Missouri Securitization Funding I, LLC (the “LLC”), dated as of September 23, 2024, has been duly executed and is being filed by the undersigned, as an authorized person, to form a limited liability company under the Delaware Limited Liability Company Act (6 Del. C. § 18-10

October 7, 2024 EX-1

Union Electric Company First Mortgage Bonds due 2055 Underwriting Agreement

Exhibit 1 Union Electric Company First Mortgage Bonds due 2055 Underwriting Agreement September 30, 2024 Barclays Capital Inc.

October 7, 2024 EX-4.2

SUPPLEMENTAL INDENTURE DATED SEPTEMBER 1, 2024 UNION ELECTRIC COMPANY THE BANK OF NEW YORK MELLON, AS TRUSTEE (SUPPLEMENTAL TO THE INDENTURE OF MORTGAGE AND DEED OF TRUST DATED JUNE 15, 1937, AS AMENDED, EXECUTED BY UNION ELECTRIC COMPANY TO THE BANK

Exhibit 4.2 SUPPLEMENTAL INDENTURE DATED SEPTEMBER 1, 2024 UNION ELECTRIC COMPANY TO THE BANK OF NEW YORK MELLON, AS TRUSTEE (SUPPLEMENTAL TO THE INDENTURE OF MORTGAGE AND DEED OF TRUST DATED JUNE 15, 1937, AS AMENDED, EXECUTED BY UNION ELECTRIC COMPANY TO THE BANK OF NEW YORK MELLON, AS TRUSTEE) 5.125% First Mortgage Bonds due 2055 This instrument was prepared by Chonda J. Nwamu, Esq., Executive

October 7, 2024 8-K

Current Report

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 7, 2024 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-1475

October 1, 2024 424B2

$450,000,000 5.125% First Mortgage Bonds due 2055

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(2)  Registration Statement No. 333-274977-02 PROSPECTUS SUPPLEMENT (To Prospectus dated October 13, 2023) $450,000,000 5.125% First Mortgage Bonds due 2055 Union Electric Company, doing business as Ameren Missouri, is offering $450,000,000 principal amount of its 5.125% First Mortgage Bonds due 2055, referred to in this prospectus supplement as the

October 1, 2024 EX-FILING FEES

Calculation of Filing Fee Tables (1) Form 424(b)(2) (Form Type) Union Electric Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Tables (1) Form 424(b)(2) (Form Type) Union Electric Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt Union Electric Company’s 5.

September 30, 2024 424B3

SUBJECT TO COMPLETION, DATED SEPTEMBER 30, 2024

TABLE OF CONTENTS The information contained in this preliminary prospectus supplement is not complete and may be changed.

September 30, 2024 FWP

Union Electric Company Pricing Term Sheet September 30, 2024

Filed Pursuant to Rule 433 Registration No. 333-274977-02 Union Electric Company Pricing Term Sheet September 30, 2024 Issue: 5.125% First Mortgage Bonds due 2055 Principal Amount: $450,000,000 Coupon (Interest Rate): 5.125% per annum Maturity Date: March 15, 2055 Benchmark Treasury: 4.625% due May 15, 2054 Benchmark Treasury Price: 108-23 Benchmark Treasury Yield: 4.113% Spread to Benchmark Treas

August 5, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended June 30, 2024 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact name of

August 5, 2024 EX-10.1

CONFIDENTIAL SEPARATION AGREEMENT AND GENERAL RELEASE

Exhibit 10.1 CONFIDENTIAL SEPARATION AGREEMENT AND GENERAL RELEASE This Confidential Separation Agreement and General Release (“Agreement”) is entered into by and between Bhavani Amirthalingam (“Employee”) and Ameren Services Company, a Missouri corporation, on behalf of itself and any parent company, subsidiary, division or affiliate entity (collectively, “Ameren”). RECITALS A.Employee has been e

July 1, 2024 8-K

Current Report

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): June 28, 2024 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-14756

June 21, 2024 8-K

Current Report

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): June 20, 2024 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-14756

May 13, 2024 8-K

Current Report

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): May 9, 2024 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-14756 Am

May 6, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended March 31, 2024 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact name of

April 5, 2024 DEF 14C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14C INFORMATION Information Statement Pursuant to Section 14(c) of the Securities Exchange Act of 1934 (Amendment No.      )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14C INFORMATION Information Statement Pursuant to Section 14(c) of the Securities Exchange Act of 1934 (Amendment No.      ) Check the appropriate box: ☐ Preliminary Information Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14c-5(d)(2)) ☒ Definitive Information Statem

April 5, 2024 DEFA14C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14C INFORMATION Information Statement Pursuant to Section 14(c) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14C INFORMATION Information Statement Pursuant to Section 14(c) of the Securities Exchange Act of 1934 (Amendment No. ) Check the appropriate box: ¨ Preliminary Information Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14c-5(d)(2)) ¨ Definitive Information Statement x Definitive Additi

April 4, 2024 EX-4.2

SUPPLEMENTAL INDENTURE DATED MARCH 1, 2024 UNION ELECTRIC COMPANY THE BANK OF NEW YORK MELLON, AS TRUSTEE (SUPPLEMENTAL TO THE INDENTURE OF MORTGAGE AND DEED OF TRUST DATED JUNE 15, 1937, AS AMENDED, EXECUTED BY UNION ELECTRIC COMPANY TO THE BANK OF

Exhibit 4.2 SUPPLEMENTAL INDENTURE DATED MARCH 1, 2024 UNION ELECTRIC COMPANY TO THE BANK OF NEW YORK MELLON, AS TRUSTEE (SUPPLEMENTAL TO THE INDENTURE OF MORTGAGE AND DEED OF TRUST DATED JUNE 15, 1937, AS AMENDED, EXECUTED BY UNION ELECTRIC COMPANY TO THE BANK OF NEW YORK MELLON, AS TRUSTEE) 5.20% First Mortgage Bonds due 2034 This instrument was prepared by Chonda J. Nwamu, Esq., Executive Vice

April 4, 2024 EX-1

Union Electric Company First Mortgage Bonds Underwriting Agreement

Exhibit 1 Union Electric Company First Mortgage Bonds Underwriting Agreement March 25, 2024 BNY Mellon Capital Markets, LLC J.

April 4, 2024 8-K

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): April 4, 2024

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): April 4, 2024 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-14756

March 26, 2024 EX-FILING FEES

Calculation of Filing Fee Tables (1) Form 424(b)(2) (Form Type) Union Electric Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Tables (1) Form 424(b)(2) (Form Type) Union Electric Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt Union Electric Company’s 5.

March 26, 2024 424B2

$500,000,000 5.20% First Mortgage Bonds due 2034

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(2)  Registration Statement No. 333-274977-02 PROSPECTUS SUPPLEMENT (To Prospectus dated October 13, 2023) $500,000,000 5.20% First Mortgage Bonds due 2034 Union Electric Company, doing business as Ameren Missouri, is offering $500,000,000 principal amount of its 5.20% First Mortgage Bonds due 2034, referred to in this prospectus supplement as the “b

March 25, 2024 FWP

Union Electric Company Pricing Term Sheet March 25, 2024

Filed Pursuant to Rule 433 Registration No. 333-274977-02 Union Electric Company Pricing Term Sheet March 25, 2024 Issue: 5.20% First Mortgage Bonds due 2034 Principal Amount: $500,000,000 Coupon (Interest Rate): 5.20% per annum Maturity Date: April 1, 2034 Benchmark Treasury: 4.00% due February 15, 2034 Benchmark Treasury Price: 97-29 Benchmark Treasury Yield: 4.261% Spread to Benchmark Treasury:

March 25, 2024 424B3

SUBJECT TO COMPLETION, DATED MARCH 25, 2024

TABLE OF CONTENTS The information contained in this preliminary prospectus supplement is not complete and may be changed.

February 29, 2024 EX-10.15

2024 Ameren Short-Term Incentive Plan Plan Summary Effective January 1, 2024

Exhibit 10.15 2024 Ameren Short-Term Incentive Plan Plan Summary Effective January 1, 2024 Contents Page Annual Performance Metrics 3 Definitions 4 Performance Achievement Levels 6 Base Award 6 Individual Performance Modifier 6 Individual Short-Term Incentive Payout 7 Confidential Information 9 Non-Solicitation 9 Impact on Incentive Award Payment 10 2 Summary The Ameren Short-Term Incentive Plan (

February 29, 2024 EX-10.53

* * *

Exhibit 10.53 Third Amendment to the Ameren Supplemental Retirement Plan Amended and Restated Effective January 1, 2008 WHEREAS, Ameren Corporation ("Company") previously adopted the Ameren Supplemental Retirement Plan, as amended and restated effective January 1, 2008 (the "Plan"); and WHEREAS, the Company reserved the right to amend the Plan; and WHEREAS, the Company desires to amend the Plan to

February 29, 2024 EX-10.48

2023 Performance Based Restricted Stock Unit Award Agreement

Exhibit 10.48 2023 Performance Based Restricted Stock Unit Award Agreement PSU Award- TSR Metric98060243v.3 Participant: Michael Moehn Grant Date: November 1, 2023 You have been granted the following Performance Based Restricted Stock Units in accordance with the terms of the Ameren Corporation 2022 Omnibus Incentive Compensation Plan (as the same may be amended from time to time, the "Plan") and

February 29, 2024 EX-24.2

POWER OF ATTORNEY

Exhibit 24.2 POWER OF ATTORNEY WHEREAS, UNION ELECTRIC COMPANY, a Missouri corporation (herein referred to as the "Company"), is required to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, its annual report on Form 10-K for the year ended December 31, 2023; and WHEREAS, each of the individuals identified below is a director

February 29, 2024 EX-10.45

2024 Performance Share Unit Award Agreement

Exhibit 10.45 2024 Performance Share Unit Award Agreement PSU Award - TSR Participant: Grant Date: You have been granted the following Performance Share Units in accordance with the terms of the Ameren Corporation 2022 Omnibus Incentive Compensation Plan (as the same may be amended from time to time, the "Plan") and the attached award agreement, referred to as Performance Share Unit Award Agreemen

February 29, 2024 EX-24.3

POWER OF ATTORNEY

Exhibit 24.3 POWER OF ATTORNEY WHEREAS, AMEREN ILLINOIS COMPANY, an Illinois corporation (herein referred to as the "Company"), is required to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, its annual report on Form 10-K for the year ended December 31, 2023; and WHEREAS, each of the individuals identified below is a direct

February 29, 2024 EX-10.55

FIFTH AMENDMENT TO THE AMEREN SUPPLEMENTAL RETIREMENT PLAN Amended and Restated Effective January 1, 2008

Exhibit 10.55 FIFTH AMENDMENT TO THE AMEREN SUPPLEMENTAL RETIREMENT PLAN Amended and Restated Effective January 1, 2008 WHEREAS, Ameren Corporation ("Company") previously adopted the Ameren Supplemental Retirement Plan, as amended and restated effective January 1, 2008 (the "Plan"), and as subsequently amended by the First Amendment to the Ameren Supplemental Retirement Plan, dated October 24, 200

February 29, 2024 EX-24.1

POWER OF ATTORNEY

Exhibit 24.1 POWER OF ATTORNEY WHEREAS, AMEREN CORPORATION, a Missouri corporation (herein referred to as the "Company"), is required to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, its annual report on Form 10-K for the year ended December 31, 2023; and WHEREAS, each of the individuals identified below is a director of

February 29, 2024 EX-10.19

2024 BASE SALARY TABLE FOR NAMED EXECUTIVE OFFICERS

Exhibit 10.19 2024 BASE SALARY TABLE FOR NAMED EXECUTIVE OFFICERS The 2024 annual base salaries of the following Named Executive Officers of Ameren Corporation (“Ameren”), Union Electric Company (“UE”) and Ameren Illinois Company (“AIC”) (which officers are employed by Ameren and/or an Ameren subsidiary as of February 16, 2024, and were determined to the extent applicable by reference to the Amere

February 29, 2024 EX-10.22

SCHEDULE I CHANGE OF CONTROL SEVERANCE PLAN PARTICIPANTS EFFECTIVE DECEMBER 15, 2023

Exhibit 10.22 SCHEDULE I CHANGE OF CONTROL SEVERANCE PLAN PARTICIPANTS EFFECTIVE DECEMBER 15, 2023 Benefit Level1 - 3 Birk, Mark C. Moehn, Michael Diya, Fadi Nwamu, Chonda * Lyons, Martin J. Singh, Leonard * Benefit Level1 - 2 Amirthalingam, Bhavani * * Not eligible for excise tax gross-up provisions (for new officers effective on or after October 1, 2009) 1 Severance benefits include: •Cash sever

February 29, 2024 EX-10.52

Amended and Restated Effective January 1, 2008

Exhibit 10.52 SECOND AMENDMENT TO THE AMEREN SUPPLEMENTAL RETIREMENT PLAN Amended and Restated Effective January 1, 2008 WHEREAS, Ameren Corporation ("Company") previously adopted the Ameren Supplemental Retirement Plan, as amended and restated effective January 1, 2008 (the "Plan"); and WHEREAS, the Company reserved the right to amend the Plan; and WHEREAS, the Company desires to amend the Plan t

February 29, 2024 EX-10.10

AMEREN DEFERRED COMPENSATION PLAN AND PARTICIPANT SUMMARY AMENDED AND RESTATED EFFECTIVE AS OF JANUARY 1, 2023

Exhibit 10.10 AMEREN DEFERRED COMPENSATION PLAN AND PARTICIPANT SUMMARY AMENDED AND RESTATED EFFECTIVE AS OF JANUARY 1, 2023 87100518v.8 AMEREN DEFERRED COMPENSATION PLAN As Amended and Restated Effective January 1, 2023 WHEREAS, Ameren Corporation amended and restated the Ameren Corporation Deferred Compensation Plan (“Plan”) effective as of January 1, 2010; and WHEREAS, Ameren Corporation reserv

February 29, 2024 EX-10.54

Amended and Restated Effective January 1, 2008

Exhibit 10.54 FOURTH AMENDMENT TO THE AMEREN SUPPLEMENTAL RETIREMENT PLAN Amended and Restated Effective January 1, 2008 WHEREAS, Ameren Corporation ("Company") previously adopted the Ameren Supplemental Retirement Plan, as amended and restated effective January 1, 2008 (the "Plan"); and WHEREAS, the Company reserved the right to amend the Plan; and WHEREAS, the Company desires to amend the Plan t

February 29, 2024 EX-10.46

2024 Performance Share Unit Award Agreement

Exhibit 10.46 2024 Performance Share Unit Award Agreement PSU Award- Clean Energy Metric305903566v.2 Participant: Grant Date: You have been granted the following Performance Share Units in accordance with the terms of the Ameren Corporation 2022 Omnibus Incentive Compensation Plan (as the same may be amended from time to time, the "Plan") and the attached award agreement, referred to as Performanc

February 29, 2024 EX-10.29

FORMULA FOR DETERMINING 2024 TARGET PSU AND RSU AWARDS FORMULA FOR DETERMINING 2024 TARGET PERFORMANCE SHARE UNIT ("PSU") AND RESTRICTED STOCK UNIT ("RSU") AWARDS TO BE ISSUED TO NAMED EXECUTIVE OFFICERS

Exhibit 10.29 FORMULA FOR DETERMINING 2024 TARGET PSU AND RSU AWARDS FORMULA FOR DETERMINING 2024 TARGET PERFORMANCE SHARE UNIT ("PSU") AND RESTRICTED STOCK UNIT ("RSU") AWARDS TO BE ISSUED TO NAMED EXECUTIVE OFFICERS The target number of PSUs and RSUs to be issued to each Named Executive Officer listed below for 2024 will be determined in accordance with the following formula: 2024 Target Number

February 29, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the fiscal year ended December 31, 2023 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact name of regi

February 29, 2024 EX-21.1

SUBSIDIARIES OF AMEREN CORPORATION AT DECEMBER 31, 2023 Name State or Jurisdiction of Organization Ameren Corporation Missouri Ameren Development Company Missouri Missouri Central Railroad Company Delaware QST Enterprises Inc. Illinois Ameren EIP Inv

Exhibit 21.1 SUBSIDIARIES OF AMEREN CORPORATION AT DECEMBER 31, 2023 Name State or Jurisdiction of Organization Ameren Corporation Missouri Ameren Development Company Missouri Missouri Central Railroad Company Delaware QST Enterprises Inc. Illinois Ameren EIP Investment, LLC Delaware Ameren Accelerator Investments, LLC Delaware AmerenEnergy Medina Valley Cogen, L.L.C. Illinois Ameren Transmission

February 29, 2024 EX-10.47

2024 Restricted Stock Unit Award Agreement

Exhibit 10.47 2024 Restricted Stock Unit Award Agreement RSU Annual Award Notice of 2024 Restricted Stock Unit Award Participant: Grant Date: You have been granted the following Restricted Stock Units in accordance with the terms of the Ameren Corporation 2022 Omnibus Incentive Compensation Plan (as the same may be amended from time to time, the "Plan") and the attached award agreement, referred t

February 29, 2024 EX-97.1

AMEREN CORPORATION FINANCIAL RESTATEMENT COMPENSATION RECOUPMENT POLICY

Exhibit 97.1 AMEREN CORPORATION FINANCIAL RESTATEMENT COMPENSATION RECOUPMENT POLICY This Ameren Corporation Financial Restatement Compensation Recoupment Policy (“Policy”) has been adopted by the Human Resources Committee of the Board of Directors (the “Board”) of Ameren Corporation as of August 10, 2023. This Policy provides for the recoupment of certain executive compensation in the event of an

January 9, 2024 EX-4.2

SUPPLEMENTAL INDENTURE DATED JANUARY 1, 2024 UNION ELECTRIC COMPANY THE BANK OF NEW YORK MELLON, AS TRUSTEE (SUPPLEMENTAL TO THE INDENTURE OF MORTGAGE AND DEED OF TRUST DATED JUNE 15, 1937, AS AMENDED, EXECUTED BY UNION ELECTRIC COMPANY TO THE BANK O

Exhibit 4.2 SUPPLEMENTAL INDENTURE DATED JANUARY 1, 2024 UNION ELECTRIC COMPANY TO THE BANK OF NEW YORK MELLON, AS TRUSTEE (SUPPLEMENTAL TO THE INDENTURE OF MORTGAGE AND DEED OF TRUST DATED JUNE 15, 1937, AS AMENDED, EXECUTED BY UNION ELECTRIC COMPANY TO THE BANK OF NEW YORK MELLON, AS TRUSTEE) 5.25% First Mortgage Bonds due 2054 This instrument was prepared by Chonda J. Nwamu, Esq., Executive Vic

January 9, 2024 8-K

Current Report

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): January 9, 2024 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-1475

January 9, 2024 EX-1

Union Electric Company First Mortgage Bonds Underwriting Agreement

Exhibit 1 Union Electric Company First Mortgage Bonds Underwriting Agreement January 3, 2024 BofA Securities, Inc.

January 4, 2024 424B2

$350,000,000 5.25% First Mortgage Bonds due 2054

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(2)  Registration No: 333-274977-02 PROSPECTUS SUPPLEMENT (To Prospectus dated October 13, 2023) $350,000,000 5.

January 4, 2024 EX-FILING FEES

Calculation of Filing Fee Tables (1) Form 424(b)(2) (Form Type) Union Electric Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Tables (1) Form 424(b)(2) (Form Type) Union Electric Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt Union Electric Company’s 5.

January 3, 2024 424B3

SUBJECT TO COMPLETION, DATED JANUARY 3, 2024

TABLE OF CONTENTS The information contained in this preliminary prospectus supplement is not complete and may be changed.

January 3, 2024 FWP

Union Electric Company Pricing Term Sheet January 3, 2024

Filed Pursuant to Rule 433 Registration No. 333-274977-02 Union Electric Company Pricing Term Sheet January 3, 2024 Issue: 5.25% First Mortgage Bonds due 2054 Principal Amount: $350,000,000 Coupon (Interest Rate): 5.25% per annum Maturity Date: January 15, 2054 Benchmark Treasury: 4.125% due August 15, 2053 Benchmark Treasury Price: 100-30+ Benchmark Treasury Yield: 4.069% Spread to Benchmark Trea

November 9, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended September 30, 2023 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact nam

October 13, 2023 EX-5.3

October 13, 2023

Exhibit 5.3 October 13, 2023 Ameren Corporation Union Electric Company Ameren Illinois Company c/o Ameren Corporation 1901 Chouteau Avenue St. Louis, Missouri 63103 Ladies and Gentlemen: As counsel to Ameren Corporation, a Missouri corporation (“Ameren”), Union Electric Company, a Missouri corporation (“UE”), and Ameren Illinois Company, an Illinois corporation (“AIC”), we have participated in the

October 13, 2023 EX-25.8

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTE

Exhibit 25.8 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) ¨ THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. (Exact name of trustee as specified in its charter) (Ju

October 13, 2023 EX-24.1

POWER OF ATTORNEY

Exhibit 24.1 POWER OF ATTORNEY WHEREAS, AMEREN CORPORATION, a Missouri corporation (herein referred to as the “Company”), intends to file with the Securities and Exchange Commission, under the Securities Act of 1933, as amended, a registration statement or registration statements on an appropriate form and any amendments thereto, which may be jointly filed with subsidiaries of the Company (the “Su

October 13, 2023 EX-25.4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTE

Exhibit 25.4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) ¨ THE BANK OF NEW YORK MELLON (Exact name of trustee as specified in its charter) New York (Jurisdiction

October 13, 2023 EX-25.7

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTE

Exhibit 25.7 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) ¨ THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. (Exact name of trustee as specified in its charter) (Ju

October 13, 2023 EX-25.5

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTE

Exhibit 25.5 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) ¨ THE BANK OF NEW YORK MELLON (Exact name of trustee as specified in its charter) New York (Jurisdiction

October 13, 2023 S-3ASR

As filed with the Securities and Exchange Commission on October 13, 2023

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on October 13, 2023 Registration Nos.

October 13, 2023 EX-25.1

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTE

Exhibit 25.1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) ¨ THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. (Exact name of trustee as specified in its charter) (Ju

October 13, 2023 EX-FILING FEES

Calculation of Filing Fee Tables Form S-3 (Form Type) Ameren Corporation Union Electric Company Ameren Illinois Company (Exact Name of Registrants as Specified in their Charters) Table 1: Newly Registered Securities and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) Ameren Corporation Union Electric Company Ameren Illinois Company (Exact Name of Registrants as Specified in their Charters) Table 1: Newly Registered Securities and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt Ameren Corporation Senior Debt Securities Rule 457(r) (1) — — — $0.

September 26, 2023 8-K

Current Report

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): September 26, 2023 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-1

August 3, 2023 EX-10.1

[Signature pages follow]

Exhibit 10.1 EXECUTION VERSION FIRST AMENDMENT dated as of April 19, 2023 (this “Amendment”), among AMEREN CORPORATION, a Missouri corporation (the “Company”), UNION ELECTRIC COMPANY, d/b/a Ameren Missouri, a Missouri corporation (the “Borrowing Subsidiary” and, together with the Company, the “Borrowers”), the LENDERS party hereto and JPMORGAN CHASE BANK, N.A., as Administrative Agent. WHEREAS, re

August 3, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended June 30, 2023 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact name of

August 3, 2023 EX-10.2

[Signature pages follow]

Exhibit 10.2 EXECUTION VERSION FIRST AMENDMENT dated as of April 19, 2023 (this “Amendment”), among AMEREN CORPORATION, a Missouri corporation (the “Company”), AMEREN ILLINOIS COMPANY, an Illinois corporation (the “Borrowing Subsidiary” and, together with the Company, the “Borrowers”), the LENDERS party hereto and JPMORGAN CHASE BANK, N.A., as Administrative Agent. WHEREAS, reference is made to th

May 12, 2023 8-K

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): May 11, 2023

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): May 11, 2023 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-14756 A

May 5, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended March 31, 2023 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact name of

April 7, 2023 8-K

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): April 7, 2023

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): April 7, 2023 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-14756

March 28, 2023 DEFA14C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14C INFORMATION Information Statement Pursuant to Section 14(c) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14C INFORMATION Information Statement Pursuant to Section 14(c) of the Securities Exchange Act of 1934 (Amendment No. ) Check the appropriate box: ¨ Preliminary Information Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14c-5(d)(2)) ¨ Definitive Information Statement x Definitive Additi

March 28, 2023 DEF 14C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14C INFORMATION Information Statement Pursuant to Section 14(c) of the Securities Exchange Act of 1934 (Amendment No.      )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14C INFORMATION Information Statement Pursuant to Section 14(c) of the Securities Exchange Act of 1934 (Amendment No.      ) Check the appropriate box: ☐ Preliminary Information Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14c-5(d)(2)) ☒ Definitive Information Statem

March 13, 2023 EX-4.2

Supplemental Indenture to the Ameren Missouri Mortgage, dated February 1, 2023, for 5.45% First Mortgage Bonds due 2053 (March 13, 2023 Form 8-K, Exhibit 4.2, File No. 1-2967).

Exhibit 4.2 SUPPLEMENTAL INDENTURE DATED FEBRUARY 1, 2023 UNION ELECTRIC COMPANY TO THE BANK OF NEW YORK MELLON, AS TRUSTEE (SUPPLEMENTAL TO THE INDENTURE OF MORTGAGE AND DEED OF TRUST DATED JUNE 15, 1937, AS AMENDED, EXECUTED BY UNION ELECTRIC COMPANY TO THE BANK OF NEW YORK MELLON, AS TRUSTEE) 5.45% First Mortgage Bonds due 2053 This instrument was prepared by Chonda J. Nwamu, Esq., Senior Vice

March 13, 2023 8-K

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): March 13, 2023

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): March 13, 2023 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-14756

March 13, 2023 EX-1

Union Electric Company First Mortgage Bonds Underwriting Agreement

Exhibit 1 Union Electric Company First Mortgage Bonds Underwriting Agreement February 27, 2023 BofA Securities, Inc.

February 28, 2023 424B2

$500,000,000 5.45% First Mortgage Bonds due 2053

TABLE OF CONTENTS   Filed Pursuant to Rule 424(b)(2)  Registration No: 333-249475-01 PROSPECTUS SUPPLEMENT (To Prospectus dated October 14, 2020) $500,000,000 5.

February 28, 2023 EX-FILING FEES

Calculation of Filing Fee Tables (1) Form 424(b)(2) (Form Type) Union Electric Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Tables (1) Form 424(b)(2) (Form Type) Union Electric Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities Security type Security class title Fee calculation or carry forward rule Amount registered Proposed maximum offering price per unit Maximum aggregate offering price Fee rate Amount of registration fee Carry forward form type Carry forward file number Carry forward initial effective date Filing fee previously paid in connection with unsold securities to be carried forward Newly Registered Securities Fees to Be Paid Debt Union Electric Company’s 5.

February 27, 2023 FWP

Union Electric Company Pricing Term Sheet February 27, 2023

Filed Pursuant to Rule 433 Registration No. 333-249475-01 Union Electric Company Pricing Term Sheet February 27, 2023 Issue: 5.45% First Mortgage Bonds due 2053 Principal Amount: $500,000,000 Coupon (Interest Rate): 5.45% per annum Maturity Date: March 15, 2053 Benchmark Treasury: 4.000% due November 15, 2052 Benchmark Treasury Price: 101-16 Benchmark Treasury Yield: 3.914% Spread to Benchmark Tre

February 27, 2023 424B3

SUBJECT TO COMPLETION, DATED FEBRUARY 27, 2023

TABLE OF CONTENTS The information contained in this preliminary prospectus supplement is not complete and may be changed.

February 22, 2023 EX-10.21

*2023 Base Salary Table for Named Executive Officers

Exhibit 10.21 2023 BASE SALARY TABLE FOR NAMED EXECUTIVE OFFICERS The 2023 annual base salaries of the following Named Executive Officers of Ameren Corporation (“Ameren”), Union Electric Company (“UE”) and Ameren Illinois Company (“AIC”) (which officers are employed by Ameren and/or an Ameren subsidiary as of February 16, 2023, and were determined to the extent applicable by reference to the Amere

February 22, 2023 EX-99.1

Amended and Restated Tax Allocation Agreement, dated as of December 22, 2022

Exhibit 99.1 AMEREN CORPORATION AND ITS AFFILIATED CORPORATIONS AMENDED AND RESTATED TAX ALLOCATION AGREEMENT This Amended and Restated Tax Allocation Agreement (the "Agreement") is made effective as of December 22, 2022 by and among Ameren Corporation (“Ameren”), a Missouri Corporation, and its affiliated corporations, as identified in Exhibit A hereto (collectively, the "Group"; individually, "M

February 22, 2023 EX-10.46

Form of Performance Share Unit Award Agreement (Clean Energy Transition metric) for awards issued in 2023 pursuant to 2022 Omnibus Incentive Compensation Plan

Exhibit 10.46 2023 Performance Share Unit Award Agreement 59961003v.4 78539999v.2 Ameren Corporation 2023 Performance Share Unit Award Agreement (Clean Energy) THIS AGREEMENT, effective as of the Grant Date set forth in the Notice of 2023 Performance Share Unit Award (Clean Energy) ("Notice"), represents the grant of Performance Share Units by Ameren Corporation ( “Ameren”), to the Participant set

February 22, 2023 EX-10.10

SECOND AMENDMENT TO THE AMEREN DEFERRED COMPENSATION PLAN Amended and Restated Effective January 1, 2010

Exhibit 10.10 SECOND AMENDMENT TO THE AMEREN DEFERRED COMPENSATION PLAN Amended and Restated Effective January 1, 2010 WHEREAS, Ameren Corporation ("Company") previously established and adopted the Ameren Deferred Compensation Plan, as amended and restated effective January 1, 2010 (the "Plan"); and WHEREAS, the Company reserved the right to amend the Plan; and WHEREAS, the Company desires to amen

February 22, 2023 EX-10.47

Form of Restrictive Stock Unit Award Agreement for awards issued in 2023 pursuant to 2022 Omnibus Incentive Compensation Plan

Exhibit 10.47 2023 Restricted Stock Unit Award Agreement 59961003v.4 78539999v.2 Ameren Corporation 2023 Restricted Stock Unit Award Agreement THIS AGREEMENT, effective as of the Grant Date set forth in the Notice of 2023 Restricted Stock Unit Award ("Notice"), represents the grant of Restricted Stock Units by Ameren Corporation (“Ameren”) to the Participant set forth in the Notice, pursuant to th

February 22, 2023 EX-24.1

POWER OF ATTORNEY

EX-24.1 16 aee202210-kxexhibit241.htm POWER OF ATTORNEY Exhibit 24.1 POWER OF ATTORNEY WHEREAS, AMEREN CORPORATION, a Missouri corporation (herein referred to as the "Company"), is required to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, its annual report on Form 10-K for the year ended December 31, 2022; and WHEREAS, ea

February 22, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the fiscal year ended December 31, 2022 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact name of regi

February 22, 2023 EX-10.31

*Formula for Determining 2023 Target Performance Share Unit and Restricted Stock Unit Awards to be Issued to Named Executive Officers

Exhibit 10.31 FORMULA FOR DETERMINING 2023 TARGET PSU AND RSU AWARDS FORMULA FOR DETERMINING 2023 TARGET PERFORMANCE SHARE UNIT ("PSU") AND RESTRICTED STOCK UNIT ("RSU") AWARDS TO BE ISSUED TO NAMED EXECUTIVE OFFICERS The target number of PSUs and RSUs to be issued to each Named Executive Officer listed below for 2023 will be determined in accordance with the following formula: 2023 Target Number

February 22, 2023 EX-10.11

THIRD AMENDMENT TO THE AMEREN DEFERRED COMPENSATION PLAN Amended and Restated Effective January 1, 2010

Exhibit 10.11 THIRD AMENDMENT TO THE AMEREN DEFERRED COMPENSATION PLAN Amended and Restated Effective January 1, 2010 WHEREAS, Ameren Corporation ("Company") previously established and adopted the Ameren Deferred Compensation Plan, as amended and restated effective January 1, 2010 (the "Plan"); and WHEREAS, the Company reserved the right to amend the Plan; and WHEREAS, the Company desires to amend

February 22, 2023 EX-10.17

2023 Ameren Short-Term Incentive Plan Plan Summary Effective January 1, 2023

EXHIBIT 10.17 2023 Ameren Short-Term Incentive Plan Plan Summary Effective January 1, 2023 1 EXHIBIT 10.17 Contents Page Summary 3 Eligibility 3 Award Opportunities 3 Plan Structure 3 Annual Performance Metrics 3 Definitions 4 Performance Achievement Levels 6 Base Award 6 Individual Performance Modifier 6 Individual Short-Term Incentive Payout 7 Impact of Events 8 Confidentiality and Non-Solicitat

February 22, 2023 EX-21.1

SUBSIDIARIES OF AMEREN CORPORATION AT DECEMBER 31, 2022 Name State or Jurisdiction of Organization Ameren Corporation Missouri Ameren Development Company Missouri Missouri Central Railroad Company Delaware QST Enterprises Inc. Illinois Ameren EIP Inv

Exhibit 21.1 SUBSIDIARIES OF AMEREN CORPORATION AT DECEMBER 31, 2022 Name State or Jurisdiction of Organization Ameren Corporation Missouri Ameren Development Company Missouri Missouri Central Railroad Company Delaware QST Enterprises Inc. Illinois Ameren EIP Investment, LLC Delaware Ameren Accelerator Investments, LLC Delaware AmerenEnergy Medina Valley Cogen, L.L.C. Illinois Ameren Transmission

February 22, 2023 EX-10.12

FOURTH AMENDMENT TO THE AMEREN DEFERRED COMPENSATION PLAN Amended and Restated Effective January 1, 2010

Exhibit 10.12 FOURTH AMENDMENT TO THE AMEREN DEFERRED COMPENSATION PLAN Amended and Restated Effective January 1, 2010 WHEREAS, Ameren Corporation (“Company”) previously established and adopted the Ameren Deferred Compensation Plan, as amended and restated effective January 1, 2010 (the “Plan”), and as further amended by the First Amendment to the Ameren Deferred Compensation Plan, dated October 1

February 22, 2023 EX-24.2

POWER OF ATTORNEY

Exhibit 24.2 POWER OF ATTORNEY WHEREAS, UNION ELECTRIC COMPANY, a Missouri corporation (herein referred to as the "Company"), is required to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, its annual report on Form 10-K for the year ended December 31, 2022; and WHEREAS, each of the individuals identified below is a director

February 22, 2023 EX-10.24

SCHEDULE I CHANGE OF CONTROL SEVERANCE PLAN PARTICIPANTS EFFECTIVE FEBRUARY 10, 2023

Exhibit 10.24 SCHEDULE I CHANGE OF CONTROL SEVERANCE PLAN PARTICIPANTS EFFECTIVE FEBRUARY 10, 2023 Benefit Level1 - 3 Baxter, Warner L. Lyons, Martin J. Birk, Mark C. Moehn, Michael Nwamu, Chonda * Singh, Leonard * * Not eligible for excise tax gross-up provisions (for new officers effective on or after October 1, 2009) 1 Severance benefits include: •Cash severance, defined as a multiple of i) ann

February 22, 2023 EX-10.45

Form of Performance Share Unit Award Agreement (Relative Total Shareholder Return metric) for awards issued in 2023 pursuant to 2022 Omnibus Incentive Compensation Plan

Exhibit 10.45 2023 Performance Share Unit Award Agreement 59961003v.4 78539999v.2 Ameren Corporation 2023 Performance Share Unit Award Agreement (TSR) THIS AGREEMENT, effective as of the Grant Date set forth in the Notice of 2023 Performance Share Unit Award (TSR) ("Notice"), represents the grant of Performance Share Units by Ameren Corporation (“Ameren”), to the Participant set forth in the Notic

February 22, 2023 EX-24.3

POWER OF ATTORNEY

Exhibit 24.3 POWER OF ATTORNEY WHEREAS, AMEREN ILLINOIS COMPANY, an Illinois corporation (herein referred to as the "Company"), is required to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, its annual report on Form 10-K for the year ended December 31, 2022; and WHEREAS, each of the individuals identified below is a direct

December 6, 2022 EX-10.1

AMENDED AND RESTATED CREDIT AGREEMENT

? EXHIBIT?10.1 ? EXECUTION VERSION ? ? ? AMENDED AND RESTATED CREDIT AGREEMENT ? DATED AS OF DECEMBER 6, 2022, ? among ? AMEREN CORPORATION and UNION ELECTRIC company as Borrowers, ? THE LENDERS FROM TIME TO TIME PARTY HERETO ? and ? JPMORGAN CHASE BANK, N.A. as Administrative Agent ? ? ? JPMorgan ChaSe Bank, N.A., BARCLAYS BANK PLC, MUFG Bank,?LTD., BOFA SECURITIES,?INC. and wells fargo SECURITIE

December 6, 2022 EX-10.2

AMENDED AND RESTATED CREDIT AGREEMENT

? EXHIBIT?10.2 ? EXECUTION VERSION ? ? ? AMENDED AND RESTATED CREDIT AGREEMENT ? DATED AS OF DECEMBER 6, 2022, ? among ? AMEREN CORPORATION and AMEREN illinois company as Borrowers, ? THE LENDERS FROM TIME TO TIME PARTY HERETO ? and ? JPMORGAN CHASE BANK, N.A. as Administrative Agent ? ? ? JPMorgan ChaSe Bank, N.A., BARCLAYS BANK PLC, MUFG Bank,?LTD., BOFA SECURITIES,?INC. and wells fargo SECURITI

December 6, 2022 8-K

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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): December 6, 2022 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-147

November 4, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended September 30, 2022 OR ? Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact nam

August 8, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended June 30, 2022 OR ? Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact name of

June 23, 2022 8-K

Current Report

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): June 22, 2022 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-14756

May 13, 2022 8-K

Current Report

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): May 12, 2022 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-14756 A

May 13, 2022 EX-10.1

Ameren Corporation 2022 Omnibus Incentive Compensation Plan ARTICLE 1 Establishment, Effectiveness, Purpose and Duration

Exhibit 10.1 Ameren Corporation 2022 Omnibus Incentive Compensation Plan ARTICLE 1 Establishment, Effectiveness, Purpose and Duration Section 1.01. Establishment. Ameren Corporation, a Missouri corporation (hereinafter referred to as the ?Company?), establishes an incentive compensation plan to be known as the Ameren Corporation 2022 Omnibus Incentive Compensation Plan (hereinafter referred to as

May 6, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended March 31, 2022 OR ? Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact name of

April 1, 2022 8-K

Current Report

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): April 1, 2022 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-14756

April 1, 2022 EX-4.2

Supplemental Indenture to the Ameren Missouri Mortgage, dated March 1, 2022, for 3.90% First Mortgage Bonds due 2052

Exhibit 4.2 SUPPLEMENTAL INDENTURE DATED MARCH 1, 2022 UNION ELECTRIC COMPANY TO THE BANK OF NEW YORK MELLON, AS TRUSTEE (SUPPLEMENTAL TO THE INDENTURE OF MORTGAGE AND DEED OF TRUST DATED JUNE 15, 1937, AS AMENDED, EXECUTED BY UNION ELECTRIC COMPANY TO THE BANK OF NEW YORK MELLON, AS TRUSTEE) 3.90% First Mortgage Bonds due 2052 This instrument was prepared by Chonda J. Nwamu, Esq., Senior Vice Pre

April 1, 2022 EX-1

Union Electric Company First Mortgage Bonds Underwriting Agreement

Exhibit 1 Union Electric Company First Mortgage Bonds Underwriting Agreement March 21, 2022 Barclays Capital Inc.

March 29, 2022 DEFA14C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14C INFORMATION Information Statement Pursuant to Section 14(c) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14C INFORMATION Information Statement Pursuant to Section 14(c) of the Securities Exchange Act of 1934 (Amendment No. ) Check the appropriate box: ? Preliminary Information Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14c-5(d)(2)) ? Definitive Information Statement x Definitive Additi

March 29, 2022 DEF 14C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14C INFORMATION Information Statement Pursuant to Section 14(c) of the Securities Exchange Act of 1934 (Amendment No.      )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? SCHEDULE 14C INFORMATION Information Statement Pursuant to Section 14(c) of the Securities Exchange Act of 1934 (Amendment No.??????)? ? Check the appropriate box: ? Preliminary Information Statement ? ? Confidential, for Use of the Commission Only (as permitted by Rule 14c-5(d)(2)) ? ? Definitive Informati

March 22, 2022 EX-FILING FEES

Calculation of Filing Fee Tables(1) Form 424(b)(2) (Form Type) Union Electric Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities

? Exhibit 107? Calculation of Filing Fee Tables(1)? Form 424(b)(2) (Form Type) Union Electric Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities ? ? ? Security type ? ? Security class title ? ? Fee calculation or carry forward rule ? ? Amount registered ? ? Proposed maximum offering price per unit ? ? Maximum aggregate offering price ? ? Fee rate ? ? Amount of registration fee ? ? Carry forward form type ? ? Carry forward file number ? ? Carry forward initial effective date ? ? Filing fee previously paid in connection with unsold securities to be carried forward ? Newly Registered Securities ? Fees to Be Paid ? ? Debt ? ? Union Electric Company?s 3.

March 22, 2022 424B2

$525,000,000 3.90% First Mortgage Bonds due 2052

TABLE OF CONTENTS ?Filed Pursuant to Rule 424(b)(2)? ?Registration No: 333-249475-01? PROSPECTUS SUPPLEMENT (To Prospectus dated October 14, 2020) $525,000,000 3.

March 21, 2022 FWP

Union Electric Company Pricing Term Sheet March 21, 2022

Filed Pursuant to Rule 433 Registration No. 333-249475-01 Union Electric Company Pricing Term Sheet March 21, 2022 Issue: 3.90% First Mortgage Bonds due 2052 Principal Amount: $525,000,000 Coupon (Interest Rate): 3.90% per annum Maturity Date: April 1, 2052 Benchmark Treasury: 1.875% due November 15, 2051 Benchmark Treasury Price: 85-24 Benchmark Treasury Yield: 2.564% Spread to Benchmark Treasury

March 21, 2022 424B3

SUBJECT TO COMPLETION, DATED MARCH 21, 2022

TABLE OF CONTENTS The information contained in this preliminary prospectus supplement is not complete and may be changed.

February 23, 2022 EX-24.3

POWER OF ATTORNEY

Exhibit 24.3 POWER OF ATTORNEY WHEREAS, AMEREN ILLINOIS COMPANY, an Illinois corporation (herein referred to as the "Company"), is required to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, its annual report on Form 10-K for the year ended December 31, 2021; and WHEREAS, each of the individuals identified below is a direct

February 23, 2022 EX-10.3

EXECUTION VERSION [[5733195]] FIRST AMENDMENT dated as of November 5, 2021 (this “Amendment”), among AMEREN CORPORATION, a Missouri corporation (the “Company”), UNION ELECTRIC COMPANY, d/b/a Ameren Missouri, a Missouri corporation (the “Borrowing Sub

EXECUTION VERSION [[5733195]] FIRST AMENDMENT dated as of November 5, 2021 (this ?Amendment?), among AMEREN CORPORATION, a Missouri corporation (the ?Company?), UNION ELECTRIC COMPANY, d/b/a Ameren Missouri, a Missouri corporation (the ?Borrowing Subsidiary? and, together with the Company, the ?Borrowers?), the LENDERS party hereto, the ISSUING BANKS party hereto and JPMORGAN CHASE BANK, N.

February 23, 2022 EX-10.6

Summary Sheet of Ameren Corporation Non-Management Director Compensation Effective Date: January 1, 2022

Exhibit 10.6 Summary Sheet of Ameren Corporation Non-Management Director Compensation Effective Date: January 1, 2022 $125,000 Base cash annual retainer payable in twelve equal installments Approximately $150,000 of shares Shares of the Company?s common stock to be awarded to new Directors upon election on a pro-rata basis, and annually to all Directors on or about January 1 of each year* $30,000

February 23, 2022 EX-10.5

EXECUTION VERSION [[5726954]] FIRST AMENDMENT dated as of November 5, 2021 (this “Amendment”), among AMEREN CORPORATION, a Missouri corporation (the “Company”), AMEREN ILLINOIS COMPANY, an Illinois corporation (the “Borrowing Subsidiary” and, togethe

EX-10.5 7 amerenillinoisfirstamen.htm AMENDED AND RESTATED CREDIT AGREEMENT EXECUTION VERSION [[5726954]] FIRST AMENDMENT dated as of November 5, 2021 (this “Amendment”), among AMEREN CORPORATION, a Missouri corporation (the “Company”), AMEREN ILLINOIS COMPANY, an Illinois corporation (the “Borrowing Subsidiary” and, together with the Company, the “Borrowers”), the LENDERS party hereto, the ISSUIN

February 23, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ? Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the fiscal year ended December 31, 2021 OR ? Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact name of regi

February 23, 2022 EX-4.98

Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

Exhibit 4.98 Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 As of January 31, 2022 (?Description Date?), Ameren Corporation (?Ameren?) had one class of securities registered under Section 12 of the Securities Exchange Act of 1934?its common stock, $.01 par value per share (?common stock?). The common stock is listed on The New York Stock Exchange

February 23, 2022 EX-21.1

SUBSIDIARIES OF AMEREN CORPORATION AT DECEMBER 31, 2021 Name State or Jurisdiction of Organization Ameren Corporation Missouri Ameren Development Company Missouri Missouri Central Railroad Company Delaware QST Enterprises Inc. Illinois Ameren EIP Inv

Exhibit 21.1 SUBSIDIARIES OF AMEREN CORPORATION AT DECEMBER 31, 2021 Name State or Jurisdiction of Organization Ameren Corporation Missouri Ameren Development Company Missouri Missouri Central Railroad Company Delaware QST Enterprises Inc. Illinois Ameren EIP Investment, LLC Delaware Ameren Accelerator Investments, LLC Delaware AmerenEnergy Medina Valley Cogen, L.L.C. Illinois Ameren Transmission

February 23, 2022 EX-10.23

SCHEDULE I CHANGE OF CONTROL SEVERANCE PLAN PARTICIPANTS NAMED EXECUTIVE OFFICERS

Exhibit 10.23 SCHEDULE I CHANGE OF CONTROL SEVERANCE PLAN PARTICIPANTS NAMED EXECUTIVE OFFICERS Benefit Level - 31 Baxter, Warner L. Mark, Richard J. Diya, Fadi M. Moehn, Michael Lyons, Martin J. Nwamu, Chonda * Benefit Level - 2 Amirthalingam, Bhavani * * Not eligible for excise tax gross-up provisions (for new officers effective on or after October 1, 2009) 1 Benefit levels are defined as a paym

February 23, 2022 EX-10.16

2022 Ameren Short-Term Incentive Plan Plan Summary Effective January 1, 2022

EXHIBIT 10.16 2022 Ameren Short-Term Incentive Plan Plan Summary Effective January 1, 2022 1 EXHIBIT 10.16 Contents Page Summary 3 Eligibility 3 Award Opportunities 3 Plan Structure 3 Annual Performance Metrics 3 Definitions 4 Performance Achievement Levels 6 Base Award 6 Individual Performance Modifier 6 Individual Short-Term Incentive Payout 7 Impact of Events 8 Confidentiality and Non-Solicitat

February 23, 2022 EX-4.99

Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

Exhibit 4.99 Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 As of January 31, 2022 (?Description Date?), Union Electric Company, doing business as Ameren Missouri, had one class of securities registered under Section 12 of the Securities Exchange Act of 1934?its preferred stock, cumulative, no par value, stated value $100 per share. As of the Des

February 23, 2022 EX-10.20

2022 BASE SALARY TABLE FOR NAMED EXECUTIVE OFFICERS

Exhibit 10.20 2022 BASE SALARY TABLE FOR NAMED EXECUTIVE OFFICERS The 2022 annual base salaries of the following Named Executive Officers of Ameren Corporation (?Ameren?), Union Electric Company (?UE?) and Ameren Illinois Company (?AIC?) (which officers are employed by Ameren and/or an Ameren subsidiary as of February 16, 2022, and were determined to the extent applicable by reference to the Amere

February 23, 2022 EX-10.43

2022 Restricted Stock Unit

2022 Restricted Stock Unit Award Agreement :Ameren Corporation 2022 Restricted Stock Unit Award Agreement THIS AGREEMENT, effective as of the Grant Date set forth in the Notice of 2022 Restricted Stock Unit Award ("Notice"), represents the grant of Restricted Stock Units by Ameren Corporation (?Ameren?) to the Participant set forth in the Notice, pursuant to the provisions of the Ameren Corporation 2014 Omnibus Incentive Compensation Plan, as it may be amended from time to time (the ?Plan?).

February 23, 2022 EX-10.30

FORMULA FOR DETERMINING 2022 TARGET PSU AND RSU AWARDS FORMULA FOR DETERMINING 2022 TARGET PERFORMANCE SHARE UNIT ("PSU") AND RESTRICTED STOCK UNIT ("RSU") AWARDS TO BE ISSUED TO NAMED EXECUTIVE OFFICERS

Exhibit 10.30 FORMULA FOR DETERMINING 2022 TARGET PSU AND RSU AWARDS FORMULA FOR DETERMINING 2022 TARGET PERFORMANCE SHARE UNIT ("PSU") AND RESTRICTED STOCK UNIT ("RSU") AWARDS TO BE ISSUED TO NAMED EXECUTIVE OFFICERS The target number of PSUs and RSUs to be issued to each Named Executive Officer listed below for 2022 will be determined in accordance with the following formula: 2022 Target Number

February 23, 2022 EX-10.42

90th percentile +

2022 Performance Share Unit Award Agreement :Ameren Corporation 2022 Performance Share Unit Award Agreement THIS AGREEMENT, effective as of the Grant Date set forth in the Notice of 2022 Performance Share Unit Awards ("Notice"), represents the grant of Performance Share Units by Ameren Corporation ( ?Ameren?), to the Participant set forth in the Notice, pursuant to the provisions of the Ameren Corporation 2014 Omnibus Incentive Compensation Plan, as it may be amended from time to time (the ?Plan?).

February 23, 2022 EX-24.2

POWER OF ATTORNEY

Exhibit 24.2 POWER OF ATTORNEY WHEREAS, UNION ELECTRIC COMPANY, a Missouri corporation (herein referred to as the "Company"), is required to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, its annual report on Form 10-K for the year ended December 31, 2021; and WHEREAS, each of the individuals identified below is a director

February 23, 2022 EX-4.9

Ameren Transmission Company of Illinois $75,000,000 2.45% Senior Notes, Series A, due November 16, 2036 $95,000,000 2.96% Senior Notes, Series B, due August 25, 2052 Note Purchase Agreement Dated as of November 16, 2021 Table of Contents

Execution Version Ameren Transmission Company of Illinois $170,000,000 $75,000,000 2.

February 23, 2022 EX-24.1

POWER OF ATTORNEY

Exhibit 24.1 POWER OF ATTORNEY WHEREAS, AMEREN CORPORATION, a Missouri corporation (herein referred to as the "Company"), is required to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, its annual report on Form 10-K for the year ended December 31, 2021; and WHEREAS, each of the individuals identified below is a director of

February 23, 2022 EX-4.100

Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

Exhibit 4.100 Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 As of January 31, 2022 (?Description Date?), Ameren Illinois Company had one class of securities registered under Section 12 of the Securities Exchange Act of 1934?its cumulative preferred stock par value $100 per share (the ?$100 par value preferred stock?). As of the Description Date,

February 14, 2022 SC 13G/A

UEP / UNION ELECTRIC CO / BAIRD ROBERT W & CO INC /WI/ - AMENDED SCHEDULE FILED TO REPORT ACQUISITION OF BENEFICIAL OWNERSHIP 12-31-21 Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 4)* Union Electric Company (Name of Issuer) $4.56 Series Cumulative Preferred Stock (Title of Class of Securities) 906548607 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the

December 14, 2021 8-K

Current Report

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): November 30, 2021 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-14

November 26, 2021 8-K

Current Report

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): November 24, 2021 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-14

November 4, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended September 30, 2021 OR ? Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact name of registrant as

August 25, 2021 8-K

Current Report

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): August 20, 2021 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-1475

August 6, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended June 30, 2021 OR ? Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact name of registrant as spec

June 22, 2021 EX-1

Union Electric Company First Mortgage Bonds Underwriting Agreement

EX-1 2 tm2119158d4ex1.htm EXHIBIT 1 Exhibit 1 Union Electric Company First Mortgage Bonds Underwriting Agreement June 9, 2021 BofA Securities, Inc. Goldman Sachs & Co. LLC Mizuho Securities USA LLC SMBC Nikko Securities America, Inc. As Representatives of the several Underwriters named in Schedule I to the applicable Pricing Agreement c/o BofA Securities, Inc. One Bryant Park New York, New York 10

June 22, 2021 EX-4.2

Supplemental Indenture to the Ameren Missouri Mortgage dated June 1, 2021, for 2.15% First Mortgage Bonds due 2032

EX-4.2 3 tm2119158d4ex4-2.htm EXHIBIT 4.2 Exhibit 4.2 SUPPLEMENTAL INDENTURE DATED JUNE 1, 2021 UNION ELECTRIC COMPANY TO THE BANK OF NEW YORK MELLON, AS TRUSTEE (SUPPLEMENTAL TO THE INDENTURE OF MORTGAGE AND DEED OF TRUST DATED JUNE 15, 1937, AS AMENDED, EXECUTED BY UNION ELECTRIC COMPANY TO THE BANK OF NEW YORK MELLON, AS TRUSTEE) 2.15% First Mortgage Bonds due 2032 This instrument was prepared

June 22, 2021 8-K

Current Report

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): June 22, 2021 \ Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-1475

June 10, 2021 424B2

CALCULATION OF REGISTRATION FEE

TABLE OF CONTENTS CALCULATION OF REGISTRATION FEE ? ? Title of Class of Securities to be Registered ? ? ? Maximum Aggregate Offering Price ? ? ? Amount of Registration Fee(1) ? Union Electric Company 2.

June 9, 2021 424B3

SUBJECT TO COMPLETION, DATED JUNE 9, 2021

TABLE OF CONTENTS The information contained in this preliminary prospectus supplement is not complete and may be changed.

June 9, 2021 FWP

Union Electric Company Pricing Term Sheet June 9, 2021

Filed Pursuant to Rule 433 Registration No. 333-249475-01 Union Electric Company Pricing Term Sheet June 9, 2021 Issue: 2.15% First Mortgage Bonds due 2032 Principal Amount: $525,000,000 Coupon (Interest Rate): 2.15% per annum Maturity Date: March 15, 2032 Benchmark Treasury: 1.625% due May 15, 2031 Benchmark Treasury Price: 101-07+ Benchmark Treasury Yield: 1.491% Spread to Benchmark Treasury: +6

May 10, 2021 8-K

Current Report

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): May 6, 2021 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-14756 Am

May 10, 2021 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended March 31, 2021 OR ? Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact name of registrant as spe

March 31, 2021 8-K

Current Report

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): March 31, 2021 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-14756

March 23, 2021 DEF 14C

- DEF 14C

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? SCHEDULE 14C INFORMATION Information Statement Pursuant to Section 14(c) of the Securities Exchange Act of 1934 (Amendment No.??????)? ? Check the appropriate box: ? Preliminary Information Statement ? ? Confidential, for Use of the Commission Only (as permitted by Rule 14c-5(d)(2)) ? ? Definitive Informati

March 23, 2021 DEFA14C

- DEFA14C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14C INFORMATION Information Statement Pursuant to Section 14(c) of the Securities Exchange Act of 1934 (Amendment No. ) Check the appropriate box: ? Preliminary Information Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14c-5(d)(2)) ? Definitive Information Statement x Definitive Additi

February 22, 2021 EX-24.2

Powers of Attorney with respect to Ameren Missouri

Exhibit 24.2 POWER OF ATTORNEY WHEREAS, UNION ELECTRIC COMPANY, a Missouri corporation (herein referred to as the "Company"), is required to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, its annual report on Form 10-K for the year ended December 31, 2020; and WHEREAS, each of the individuals identified below is a director

February 22, 2021 EX-4.93

Description of Ameren Securities

Exhibit 4.93 Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 As of January 29, 2021 (?Description Date?), Ameren Corporation (?Ameren?) had one class of securities registered under Section 12 of the Securities Exchange Act of 1934?its common stock, $.01 par value per share (?common stock?). The common stock is listed on The New York Stock Exchange

February 22, 2021 EX-10.45

*Form of Restricted Share Unit Award Agreement for Awards Issued in 2021 pursuant to 2014 Omnibus Incentive Compensation Plan

Exhibit 10.45 2021 Restricted Stock Unit Award Agreement January 1, 2021 Ameren Corporation 2021 Restricted Stock Unit Award Agreement THIS AGREEMENT, effective as of the Grant Date set forth in the Notice of 2021 Restricted Stock Unit Award ("Notice"), represents the grant of Restricted Stock Units by Ameren Corporation (?Ameren?) to the Participant set forth in the Notice, pursuant to the provis

February 22, 2021 10-K

Annual Report - 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ? Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the fiscal year ended December 31, 2020 OR ? Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact name of regi

February 22, 2021 EX-21.1

Subsidiaries of Ameren

Exhibit 21.1 SUBSIDIARIES OF AMEREN CORPORATION AT DECEMBER 31, 2020 Name State or Jurisdiction of Organization Ameren Corporation Missouri Ameren Development Company Missouri Missouri Central Railroad Company Delaware QST Enterprises Inc. Illinois Ameren EIP Investment, LLC Delaware Ameren Accelerator Investments, LLC Delaware AmerenEnergy Medina Valley Cogen, L.L.C. Illinois Ameren Transmission

February 22, 2021 EX-10.26

Revised Schedule I to Second Amended and Restated Ameren Change of Control Severance Plan, as amended

Exhibit 10.26 SCHEDULE I CHANGE OF CONTROL SEVERANCE PLAN PARTICIPANTS SECTION 16 OFFICERS Benefit Level? - 3 Baxter, Warner L. Mark, Richard J. Diya, Fadi M. Moehn, Michael Lyons, Martin J. Nwamu, Chonda * Benefit Level - 2 Steinke, Bruce * Not eligible for excise tax gross-up provisions (for new officers effective on or after October 1, 2009) ? Benefit levels are defined as a payment amount equa

February 22, 2021 EX-10.33

*Formula for Determining 2021 Target Performance Share Unit and Restricted Stock Unit Awards to be Issued to Named Executive Officers

Exhibit 10.33 FORMULA FOR DETERMINING 2021 TARGET PSU AND RSU AWARDS FORMULA FOR DETERMINING 2021 TARGET PERFORMANCE SHARE UNIT ("PSU") AND RESTRICTED STOCK UNIT ("RSU") AWARDS TO BE ISSUED TO NAMED EXECUTIVE OFFICERS The target number of PSUs and RSUs to be issued to each Named Executive Officer listed below for 2021 will be determined in accordance with the following formula: 2021 Target Number

February 22, 2021 EX-24.1

Powers of Attorney with respect to Ameren

Exhibit 24.1 POWER OF ATTORNEY WHEREAS, AMEREN CORPORATION, a Missouri corporation (herein referred to as the "Company"), is required to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, its annual report on Form 10-K for the year ended December 31, 2020; and WHEREAS, each of the individuals identified below is a director of

February 22, 2021 EX-3.9(II)

Bylaws of Ameren Illinois, as amended February 19, 2021

Exhibit 3.9(ii) AMEREN ILLINOIS COMPANY BYLAWS As amended and restated, effective February 19, 2021 ARTICLE I SHARES AND TRANSFERS Section 1. The interest of each shareholder of any class of stock of Ameren Illinois Company (the ?Company?) shall not be evidenced by certificates for shares and all shares of all classes of stock shall be uncertificated shares; provided, however, that (a) any shares

February 22, 2021 EX-10.16

*2021 Ameren Short-Term Incentive Plan

EXHIBIT 10.16 2021 Ameren Short-Term Incentive Plan Plan Summary Effective January 1, 2021 1 Contents Page Summary 3 Eligibility 3 Award Opportunities 3 Plan Structure 3 Annual Performance Metrics 3 Definitions 4 Performance Achievement Levels 5 Base Award 6 Individual Performance Modifier 6 Individual Short-Term Incentive Payout 6 Impact of Events 7 Confidentiality and Non-Solicitation Obligation

February 22, 2021 EX-3.8(II)

Bylaws of Ameren Missouri, as amended February 19, 2021

Exhibit 3.8(ii) UNION ELECTRIC COMPANY BYLAWS As amended and restated, effective February 19, 2021 ARTICLE I SHAREHOLDERS Section 1. The annual meeting of the shareholders of the Company shall be held on the fourth Tuesday of April in each year (or if said day be a legal holiday, then on the next succeeding day not a legal holiday), at the registered office of the Company in the City of St. Louis,

February 22, 2021 EX-10.23

*2021 Base Salary Table for Named Executive Officers

Exhibit 10.23 2021 BASE SALARY TABLE FOR NAMED EXECUTIVE OFFICERS The 2021 annual base salaries of the following Named Executive Officers of Ameren Corporation (?Ameren?), Union Electric Company (?UE?) and Ameren Illinois Company (?AIC?) (which officers are employed by Ameren and/or an Ameren subsidiary as of February 12, 2021, and were determined to the extent applicable by reference to the Amere

February 22, 2021 EX-10.44

*Form of Performance Share Unit Award Agreement for Awards Issued in 2021 pursuant to 2014 Omnibus Incentive Compensation Plan

Exhibit 10.44 2021 Performance Share Unit Award Agreement January 1, 2021 Ameren Corporation 2021 Performance Share Unit Award Agreement THIS AGREEMENT, effective as of the Grant Date set forth in the Notice of 2021 Performance Share Unit Awards ("Notice"), represents the grant of Performance Share Units by Ameren Corporation (?Ameren?), to the Participant set forth in the Notice, pursuant to the

February 22, 2021 EX-4.94

Description of Ameren Missouri Securities

Exhibit 4.94 Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 As of January 31, 2021 (?Description Date?), Union Electric Company, doing business as Ameren Missouri, had one class of securities registered under Section 12 of the Securities Exchange Act of 1934?its preferred stock, cumulative, no par value, stated value $100 per share. As of the Des

February 22, 2021 EX-24.3

Powers of Attorney with respect to Ameren Illinois

Exhibit 24.3 POWER OF ATTORNEY WHEREAS, AMEREN ILLINOIS COMPANY, an Illinois corporation (herein referred to as the "Company"), is required to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, its annual report on Form 10-K for the year ended December 31, 2020; and WHEREAS, each of the individuals identified below is a direct

February 22, 2021 EX-4.95

Description of Ameren Illinois Securities

Exhibit 4.95 Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 As of January 31, 2021 (?Description Date?), Ameren Illinois Company had two class of securities registered under Section 12 of the Securities Exchange Act of 1934?(1) its cumulative preferred stock par value $100 per share (the ?$100 par value preferred stock?) and (2) its depositary sh

February 18, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 3)* Union Electric Company (Name of Issuer) $4.00 Series Cumulative Preferred Stock (Title of Class of Secu

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 3)* Union Electric Company (Name of Issuer) $4.00 Series Cumulative Preferred Stock (Title of Class of Securities) 906548409 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the

February 18, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 3)* Union Electric Company (Name of Issuer) $4.56 Series Cumulative Preferred Stock (Title of Class of Secu

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 3)* Union Electric Company (Name of Issuer) $4.56 Series Cumulative Preferred Stock (Title of Class of Securities) 906548607 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the

February 12, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 2)* Union Electric Company (Name of Issuer) $4.56 Series Cumulative Preferred Stock (Title of Class of Secu

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 2)* Union Electric Company (Name of Issuer) $4.56 Series Cumulative Preferred Stock (Title of Class of Securities) 906548607 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the

February 12, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 2)* Union Electric Company (Name of Issuer) $4.00 Series Cumulative Preferred Stock (Title of Class of Secu

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 2)* Union Electric Company (Name of Issuer) $4.00 Series Cumulative Preferred Stock (Title of Class of Securities) 906548409 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the

November 5, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended September 30, 2020 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact name of registrant as

October 14, 2020 EX-25.1

Form T-1 statement of eligibility of The Bank of New York Mellon Trust Company, N.A. as the trustee under Ameren Corporation’s Indenture, dated as of December 1, 2001.

Exhibit 25.1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) ¨ THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. (Exact name of trustee as specified in its charter) (Ju

October 14, 2020 EX-25.7

Form T-1 statement of eligibility of The Bank of New York Mellon Trust Company, N.A. as the trustee under Ameren Illinois Company’s Indenture, dated as of June 1, 2006.

Exhibit 25.7 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) ¨ THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. (Exact name of trustee as specified in its charter) 95-

October 14, 2020 EX-24.1

Ameren Power of Attorney.

EX-24.1 8 tm2032872d2ex24-1.htm EXHIBIT 24.1 Exhibit 24.1 POWER OF ATTORNEY WHEREAS, Ameren Corporation, a Missouri corporation (the “Company”), intends to file with the Securities and Exchange Commission, under the Securities Act of 1933, as amended, a registration statement or registration statements on an appropriate form and any amendments thereto, which may be jointly filed with subsidiaries

October 14, 2020 S-3ASR

- S-3ASR

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on October 14, 2020 Registration Nos.

October 14, 2020 EX-25.8

Form T-1 statement of eligibility of The Bank of New York Mellon Trust Company, N.A. as the trustee under Ameren Illinois Company’s General Mortgage Indenture and Deed of Trust, dated as of November 1, 1992.

EX-25.8 13 tm2032872d2ex25-8.htm EXHIBIT 25.8 Exhibit 25.8 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) ¨ THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. (Exact na

October 14, 2020 EX-5.3

Consent of Morgan, Lewis & Bockius LLP (included in Exhibit 5.3).

Exhibit 5.3 October 14, 2020 Ameren Corporation Union Electric Company Ameren Illinois Company c/o Ameren Corporation 1901 Chouteau Avenue St. Louis, Missouri 63103 Ladies and Gentlemen: As counsel to Ameren Corporation, a Missouri corporation (“Ameren”), Union Electric Company, a Missouri corporation (“UE”), and Ameren Illinois Company, an Illinois corporation (“AIC”), we have participated in the

October 14, 2020 EX-25.4

Form T-1 statement of eligibility of The Bank of New York Mellon as the trustee under Union Electric Company’s Indenture, dated as of August 15, 2002.

EX-25.4 10 tm2032872d2ex25-4.htm EXHIBIT 25.4 Exhibit 25.4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) || THE BANK OF NEW YORK MELLON (Exact name of trustee as sp

October 14, 2020 EX-25.5

Form T-1 statement of eligibility of The Bank of New York Mellon as the trustee under Union Electric Company’s Indenture of Mortgage and Deed of Trust, dated June 15, 1937.

EX-25.5 11 tm2032872d2ex25-5.htm EXHIBIT 25.5 Exhibit 25.5 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) || THE BANK OF NEW YORK MELLON (Exact name of trustee as sp

October 9, 2020 EX-1

Underwriting Agreement, dated October 1, 2020, between Ameren Missouri and the several underwriters named therein, for whom Barclays Capital Inc., BofA Securities, Inc. and RBC Capital Markets, LLC are acting as representatives.

EX-1 Exhibit 1 Union Electric Company First Mortgage Bonds Underwriting Agreement October 1, 2020 Barclays Capital Inc.

October 9, 2020 8-K

- 8-K

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 9, 2020 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-1475

October 9, 2020 EX-4.2

Supplemental Indenture to the Ameren Missouri Mortgage dated October 1, 2020, for 2.625% First Mortgage Bonds due 2051

EX-4.2 Exhibit 4.2 SUPPLEMENTAL INDENTURE DATED OCTOBER 1, 2020 UNION ELECTRIC COMPANY TO THE BANK OF NEW YORK MELLON, AS TRUSTEE (SUPPLEMENTAL TO THE INDENTURE OF MORTGAGE AND DEED OF TRUST DATED JUNE 15, 1937, AS AMENDED, EXECUTED BY UNION ELECTRIC COMPANY TO THE BANK OF NEW YORK MELLON, AS TRUSTEE) 2.625% First Mortgage Bonds due 2051 This instrument was prepared by Chonda J. Nwamu, Esq., Senio

October 2, 2020 424B2

CALCULATION OF REGISTRATION FEE

424B2 1 tm2032105-2424b2.htm 424B2 TABLE OF CONTENTS CALCULATION OF REGISTRATION FEE Title of Class of Securities to be Registered Maximum Aggregate Offering Price Amount of Registration Fee (1) Union Electric Company 2.625% First Mortgage Bonds due 2051 $547,371,000 $ 59,718.18 (1) Pursuant to Rules 457(o) and 457(r) under the Securities Act of 1933, the registration fee was calculated based on t

October 1, 2020 FWP

Pricing Term Sheet

Filed Pursuant to Rule 433 Registration No. 333-222108-02 October 1, 2020 Pricing Term Sheet Issuer: Union Electric Company Expected Ratings (Moody’s/S&P)*: A2 (stable) / A (stable) Trade Date: October 1, 2020 Settlement Date: October 9, 2020 (T+6)** Issue: 2.625% First Mortgage Bonds due 2051 Principal Amount: $550,000,000 Coupon (Interest Rate): 2.625% per annum Maturity Date: March 15, 2051 Ben

October 1, 2020 424B3

SUBJECT TO COMPLETION, DATED OCTOBER 1, 2020

TABLE OF CONTENTS The information contained in this preliminary prospectus supplement is not complete and may be changed.

September 28, 2020 8-K

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): September 28, 2020 Commission Fil

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): September 28, 2020 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-1

August 10, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended June 30, 2020 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number Exact name of registrant as spec

May 11, 2020 8-K

Current Report

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): May 7, 2020 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-14756 Am

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