AILLO / Ameren Illinois Company - Preferred Stock - Документы SEC, Годовой отчет, Доверенное заявление

Компания Ameren Illinois — привилегированные акции
US ˙ OTCPK

Основная статистика
LEI RC71E2BZ6UOMFPDJSE79
CIK 18654
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 Ameren Illinois Company - Preferred Stock
SEC Filings (Chronological Order)
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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

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 EX-4.2

AMEREN ILLINOIS COMPANY (SUCCESSOR TO ILLINOIS POWER COMPANY) THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. AS SUCCESSOR TRUSTEE TO HARRIS TRUST AND SAVINGS BANK SUPPLEMENTAL INDENTURE DATED AS OF FEBRUARY 1, 2025 GENERAL MORTGAGE INDENTURE AND DEE

Exhibit 4.2 WHEN RECORDED MAIL TO: Ameren Illinois Company Jonathan T. Shade One Ameren Plaza (MC 1310) 1901 Chouteau Avenue St. Louis, MO 63103 AMEREN ILLINOIS COMPANY (SUCCESSOR TO ILLINOIS POWER COMPANY) TO THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. AS SUCCESSOR TRUSTEE TO HARRIS TRUST AND SAVINGS BANK SUPPLEMENTAL INDENTURE DATED AS OF FEBRUARY 1, 2025 TO GENERAL MORTGAGE INDENTURE AND DE

March 3, 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): March 3, 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

March 3, 2025 EX-1.1

Ameren Illinois Company First Mortgage Bonds due 2055 Underwriting Agreement

Exhibit 1.1 Ameren Illinois Company First Mortgage Bonds due 2055 Underwriting Agreement February 24, 2025 BNY Mellon Capital Markets, LLC BofA Securities, Inc. Morgan Stanley & Co. LLC Truist Securities, Inc. As Representatives of the several Underwriters named in Schedule I to the applicable Pricing Agreement  c/o BNY Mellon Capital Markets, LLC 240 Greenwich Street, 3W New York, New York 10286

February 25, 2025 EX-FILING FEES

Calculation of Filing Fee Tables (1) Form 424(b)(2) (Form Type) Ameren Illinois 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) Ameren Illinois 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 Ameren Illinois Company’s 5.

February 25, 2025 424B2

$350,000,000 5.625% First Mortgage Bonds due 2055

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(2)  Registration Statement No. 333-274977-01 PROSPECTUS SUPPLEMENT (To Prospectus dated October 13, 2023) $350,000,000 5.625% First Mortgage Bonds due 2055 Ameren Illinois Company, doing business as Ameren Illinois, is offering $350,000,000 principal amount of its 5.625% First Mortgage Bonds due 2055, referred to in this prospectus supplement as the

February 24, 2025 424B3

SUBJECT TO COMPLETION, DATED FEBRUARY 24, 2025

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

February 24, 2025 FWP

Ameren Illinois Company Pricing Term Sheet February 24, 2025

Filed Pursuant to Rule 433 Registration No. 333-274977-01 Ameren Illinois Company Pricing Term Sheet February 24, 2025 Issue: 5.625% First Mortgage Bonds due 2055 Principal Amount: $350,000,000 Coupon (Interest Rate): 5.625% per annum Maturity Date: March 1, 2055 Benchmark Treasury: 4.50% due November 15, 2054 Benchmark Treasury Price: 97-06 Benchmark Treasury Yield: 4.676% Spread to Benchmark Tre

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-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

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 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-10.49

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-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-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-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 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-10.15

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-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-10.19

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

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 19, 2024 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 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

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

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

June 27, 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 27, 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 27, 2024 EX-4.2

AMEREN ILLINOIS COMPANY (SUCCESSOR TO ILLINOIS POWER COMPANY) THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. AS SUCCESSOR TRUSTEE TO HARRIS TRUST AND SAVINGS BANK SUPPLEMENTAL INDENTURE DATED AS OF JUNE 1, 2024 GENERAL MORTGAGE INDENTURE AND DEED OF

Exhibit 4.2 WHEN RECORDED MAIL TO: Ameren Illinois Company Jonathan T. Shade One Ameren Plaza (MC 1310) 1901 Chouteau Avenue St. Louis, MO 63103 AMEREN ILLINOIS COMPANY (SUCCESSOR TO ILLINOIS POWER COMPANY) TO THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. AS SUCCESSOR TRUSTEE TO HARRIS TRUST AND SAVINGS BANK SUPPLEMENTAL INDENTURE DATED AS OF JUNE 1, 2024 TO GENERAL MORTGAGE INDENTURE AND DEED O

June 27, 2024 EX-1.1

Ameren Illinois Company First Mortgage Bonds due 2054 Underwriting Agreement

Exhibit 1.1 Ameren Illinois Company First Mortgage Bonds due 2054 Underwriting Agreement June 17, 2024 Barclays Capital Inc. MUFG Securities Americas Inc. Scotia Capital (USA) Inc. TD Securities (USA) LLC Wells Fargo Securities, LLC As Representatives of the several Underwriters named in Schedule I to the applicable Pricing Agreement c/o Barclays Capital Inc. 745 Seventh Avenue New York, New York

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

June 18, 2024 424B2

$625,000,000 5.55% First Mortgage Bonds due 2054

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(2)  Registration Statement No. 333-274977-01 PROSPECTUS SUPPLEMENT (To Prospectus dated October 13, 2023) $625,000,000 5.55% First Mortgage Bonds due 2054 Ameren Illinois Company, doing business as Ameren Illinois, is offering $625,000,000 principal amount of its 5.55% First Mortgage Bonds due 2054, referred to in this prospectus supplement as the “

June 18, 2024 EX-FILING FEES

Calculation of Filing Fee Tables (1) Form 424(b)(2) (Form Type) Ameren Illinois 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) Ameren Illinois 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 Ameren Illinois Company’s 5.

June 17, 2024 424B3

SUBJECT TO COMPLETION, DATED JUNE 17, 2024

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

June 17, 2024 FWP

Ameren Illinois Company Pricing Term Sheet June 17, 2024

Filed Pursuant to Rule 433 Registration No. 333-274977-01 Ameren Illinois Company Pricing Term Sheet June 17, 2024 Issue: 5.55% First Mortgage Bonds due 2054 Principal Amount: $625,000,000 Coupon (Interest Rate): 5.55% per annum Maturity Date: July 1, 2054 Benchmark Treasury: 4.250% due February 15, 2054 Benchmark Treasury Price: 97-10 Benchmark Treasury Yield: 4.413% Spread to Benchmark Treasury:

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 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 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

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-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-10.15

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-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-10.46

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 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-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-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-10.55

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-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-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-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-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

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-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-10.19

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-10.53

* * *

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-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

December 18, 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): December 14, 2023 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 21, 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): November 16, 2023 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 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-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 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.

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-25.4

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-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-25.8

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-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-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

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 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

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

May 31, 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 31, 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 31, 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 31, 2023 EX-4.2

5% First Mortgage Bonds due 20

Exhibit 4.2 WHEN RECORDED MAIL TO: Ameren Illinois Company Jonathan T. Shade One Ameren Plaza (MC 1310) 1901 Chouteau Avenue St. Louis, MO 63103 AMEREN ILLINOIS COMPANY (SUCCESSOR TO ILLINOIS POWER COMPANY) TO THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. AS SUCCESSOR TRUSTEE TO HARRIS TRUST AND SAVINGS BANK SUPPLEMENTAL INDENTURE DATED AS OF MAY 1, 2023 TO GENERAL MORTGAGE INDENTURE AND DEED OF

May 31, 2023 EX-1.1

Underwriting Agreement relating to the Bonds, dated May 23, 2023, between Ameren Illinois and the several underwriters named therein, for whom MUFG Securities Americas Inc., PNC Capital Markets LLC, Scotia Capital (USA) Inc., SMBC Nikko Securities America, Inc. and Truist Securities, Inc. are acting as representatives.

Exhibit 1.1 Ameren Illinois Company First Mortgage Bonds due 2033 Underwriting Agreement May 23, 2023 MUFG Securities Americas Inc. PNC Capital Markets LLC Scotia Capital (USA) Inc. SMBC Nikko Securities America, Inc. Truist Securities, Inc. As Representatives of the several Underwriters named in Schedule I to the applicable Pricing Agreement c/o  MUFG Securities Americas Inc. 1221 Avenue of the A

May 24, 2023 EX-FILING FEES

Calculation of Filing Fee Tables (1) Form 424(b)(2) (Form Type) Ameren Illinois 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) Ameren Illinois 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 Ameren Illinois Company’s 4.

May 24, 2023 424B2

$500,000,000 4.95% First Mortgage Bonds due 2033

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(2)  Registration Statement No. 333-249475-02 PROSPECTUS SUPPLEMENT (To Prospectus dated October 14, 2020) $500,000,000 4.95% First Mortgage Bonds due 2033 Ameren Illinois Company, doing business as Ameren Illinois, is offering $500,000,000 principal amount of its 4.95% First Mortgage Bonds due 2033, referred to in this prospectus supplement as the “

May 23, 2023 424B3

SUBJECT TO COMPLETION, DATED MAY 23, 2023

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

May 23, 2023 FWP

Ameren Illinois Company Pricing Term Sheet May 23, 2023

Filed Pursuant to Rule 433 Registration No. 333-249475-02 Ameren Illinois Company Pricing Term Sheet May 23, 2023 Issue: 4.95% First Mortgage Bonds due 2033 Principal Amount: $500,000,000 Coupon (Interest Rate): 4.95% per annum Maturity Date: June 1, 2033 Benchmark Treasury: 3.375% due May 15, 2033 Benchmark Treasury Price: 97–05 Benchmark Treasury Yield: 3.719% Spread to Benchmark Treasury: +127

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

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 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

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-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, 2022; and WHEREAS, each of the individuals identified below is a director

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-10.17

*2023 Ameren Short-Term Incentive Plan

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-10.11

Amendment dated December 20, 2013 to Ameren’s Deferred Compensation Plan

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 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-10.47

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-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-21.1

Subsidiaries of Ameren

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-10.46

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-10.24

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

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-10.10

Amendment dated November 27, 2013 to Ameren’s Deferred Compensation Plan

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-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, 2022; and WHEREAS, each of the individuals identified below is a direct

February 22, 2023 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, 2022; and WHEREAS, each of the individuals identified below is a director of

February 22, 2023 EX-10.12

Amendment dated December 9, 2022 to Ameren’s Deferred Compensation Plan

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-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

January 23, 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): January 20, 2023 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-147

January 9, 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): January 6, 2023 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-1475

December 6, 2022 EX-10.2

Amended and Restated Credit Agreement, dated as of December 6, 2022, by and among Ameren, Ameren Illinois and JPMorgan Chase Bank, N.A., as agent, and the lenders party thereto.

? 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

December 6, 2022 EX-10.1

Amended and Restated Credit Agreement, dated as of December 6, 2022, by and among Ameren, Ameren Missouri and JPMorgan Chase Bank, N.A., as agent, and the lenders party thereto.

? 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

November 22, 2022 EX-4.2

Supplemental Indenture, dated as of November 1, 2022, by and between Ameren Illinois and The Bank of New York Mellon Trust Company, N.A., as successor trustee, relating to the Bonds.

Exhibit 4.2 WHEN RECORDED MAIL TO: Ameren Illinois Company Jonathan T. Shade One Ameren Plaza (MC 1310) 1901 Chouteau Avenue St. Louis, MO 63103 AMEREN ILLINOIS COMPANY (SUCCESSOR TO ILLINOIS POWER COMPANY) TO THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. AS SUCCESSOR TRUSTEE TO HARRIS TRUST AND SAVINGS BANK SUPPLEMENTAL INDENTURE DATED AS OF NOVEMBER 1, 2022 TO GENERAL MORTGAGE INDENTURE AND DE

November 22, 2022 EX-1.1

Underwriting Agreement relating to the Bonds, dated November 8, 2022, between Ameren Illinois and the several underwriters named therein, for whom BofA Securities, Inc., Goldman Sachs & Co. LLC, RBC Capital Markets, LLC and TD Securities (USA) LLC are acting as representatives.

Exhibit 1.1 Ameren Illinois Company First Mortgage Bonds due 2052 Underwriting Agreement November 8, 2022 BofA Securities, Inc. Goldman Sachs & Co. LLC RBC Capital Markets, LLC TD Securities (USA) LLC 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 10036 Goldman Sachs & Co. LLC 200 W

November 22, 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): November 22, 2022 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-14

November 9, 2022 EX-FILING FEES

Calculation of Filing Fee Tables (1) Form 424(b)(2) (Form Type) Ameren Illinois 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) Ameren Illinois 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 Ameren Illinois Company?s 5.

November 9, 2022 424B2

$350,000,000     5.90% First Mortgage Bonds due 2052

TABLE OF CONTENTS ?Filed pursuant to Rule 424(b)(2) ?Registration No. 333-249475-02? PROSPECTUS SUPPLEMENT (To Prospectus dated October 14, 2020) $350,000,000 ????5.90% First Mortgage Bonds due 2052 ? Ameren Illinois Company, doing business as Ameren Illinois, is offering $350,000,000 principal amount of its 5.90% First Mortgage Bonds due 2052, referred to in this prospectus supplement as the ?bon

November 8, 2022 FWP

Ameren Illinois Company Pricing Term Sheet November 8, 2022

Filed Pursuant to Rule 433 Registration No. 333-249475-02 Ameren Illinois Company Pricing Term Sheet November 8, 2022 Issuer: Ameren Illinois Company Issue: 5.90% First Mortgage Bonds due 2052 Principal Amount: $350,000,000 Coupon (Interest Rate): 5.90% per annum Maturity Date: December 1, 2052 Benchmark Treasury: 2.875% due May 15, 2052 Benchmark Treasury Price: 76?13 Benchmark Treasury Yield: 4.

November 8, 2022 424B3

SUBJECT TO COMPLETION, DATED NOVEMBER 8, 2022

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

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 29, 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): August 29, 2022 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 29, 2022 EX-1.1

Underwriting Agreement relating to the Bonds, dated August 15, 2022, between Ameren Illinois and the several underwriters named therein, for whom BNY Mellon Capital Markets, LLC, Mizuho Securities USA LLC, Morgan Stanley & Co. LLC, Truist Securities, Inc. and Wells Fargo Securities, LLC are acting as representatives.

? Exhibit?1.1 ? Ameren Illinois Company ? First Mortgage Bonds due 2032 ? Underwriting Agreement ? August?15, 2022 ? BNY Mellon Capital Markets, LLC Mizuho Securities USA LLC Morgan Stanley?& Co. LLC Truist Securities,?Inc. Wells Fargo Securities, LLC ? As Representatives of the several Underwriters named in Schedule I to the applicable Pricing Agreement ? c/o BNY Mellon Capital Markets, LLC ? 240

August 29, 2022 EX-4.2

Supplemental Indenture, dated as of August 1, 2022, by and between Ameren Illinois and The Bank of New York Mellon Trust Company, N.A., as successor trustee, relating to the Bonds.

Exhibit 4.2 WHEN RECORDED MAIL TO: Ameren Illinois Company Jonathan T. Shade One Ameren Plaza (MC 1310) 1901 Chouteau Avenue St. Louis, MO 63103 AMEREN ILLINOIS COMPANY (SUCCESSOR TO ILLINOIS POWER COMPANY) TO THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. AS SUCCESSOR TRUSTEE TO HARRIS TRUST AND SAVINGS BANK SUPPLEMENTAL INDENTURE DATED AS OF AUGUST 1, 2022 TO GENERAL MORTGAGE INDENTURE AND DEED

August 16, 2022 EX-FILING FEES

Calculation of Filing Fee Tables (1) Form 424(b)(2) (Form Type) Ameren Illinois 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) Ameren Illinois 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 Ameren Illinois Company?s 3.

August 16, 2022 424B2

$500,000,000 3.85% First Mortgage Bonds due 2032

TABLE OF CONTENTS ?Filed pursuant to Rule 424(b)(2)? ?Registration No. 333-249475-02? PROSPECTUS SUPPLEMENT (To Prospectus dated October 14, 2020) $500,000,000 3.85% First Mortgage Bonds due 2032 ? Ameren Illinois Company, doing business as Ameren Illinois, is offering $500,000,000 principal amount of its 3.85% First Mortgage Bonds due 2032, referred to in this prospectus supplement as the ?bonds.

August 15, 2022 FWP

Ameren Illinois Company Pricing Term Sheet August 15, 2022

Filed Pursuant to Rule 433 Registration No. 333-249475-02 Ameren Illinois Company Pricing Term Sheet August 15, 2022 Issuer: Ameren Illinois Company Issue: 3.85% First Mortgage Bonds due 2032 Principal Amount: $500,000,000 Coupon (Interest Rate): 3.85% per annum Maturity Date: September 1, 2032 Benchmark Treasury: 2.750% due August 15, 2032 Benchmark Treasury Price: 99?20+ Benchmark Treasury Yield

August 15, 2022 424B3

SUBJECT TO COMPLETION, DATED AUGUST 15, 2022

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

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

May 13, 2022 EX-10.1

Ameren Corporation 2022 Omnibus Incentive Compensation Plan

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 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 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

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

February 23, 2022 EX-4.99

Description of Ameren Missouri Securities

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-21.1

Subsidiaries of Ameren

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-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, 2021; and WHEREAS, each of the individuals identified below is a director of

February 23, 2022 EX-4.98

Exhibit 4.98

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-4.100

Description of Ameren Illinois Securities

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 23, 2022 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, 2021; and WHEREAS, each of the individuals identified below is a direct

February 23, 2022 EX-24.2

Powers of Attorney with respect to Ameren Missouri

EX-24.2 20 aee202110-kxexhibit242.htm 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

February 23, 2022 EX-10.30

“Formula for Determining 2022 Target Performance Share Unit and Restricted Stock Unit 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-4.9

Note Purchase Agreement, dated as of November 16, 2021, between Ameren Transmission Company of Illinois and the several purchasers named therein.

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

February 23, 2022 EX-10.5

First Amendment, dated as of November 5, 2021, by and among Ameren, Ameren Illinois and JPMorgan Chase Bank, N.A., as agent, and the lenders party thereto to the Amended and Restated Credit Agreement, dated as of December 9, 2019

amerenillinoisfirstamen 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 ISSUING BANKS party hereto and JPMORGAN CHASE BANK, N.

February 23, 2022 EX-10.43

*Form of Restricted Share Unit Award Agreement for Awards Issued in 2022 pursuant to 2014 Omnibus Incentive Compensation Plan

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-10.6

*Summary Sheet of Ameren Corporation Non-Management Director Compensation effective as of 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-10.23

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

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 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-10.42

*Form of Performance Share Unit Award Agreement for Awards Issued in 2022 pursuant to 2014 Omnibus Incentive Compensation Plan

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-10.16

*2022 Ameren Short-Term Incentive Plan

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-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-10.3

First Amendment, dated as of November 5, 2021, by and among Ameren, Ameren Missouri and JPMorgan Chase Bank, N.A., as agent, and the lenders party thereto to the Amended and Restated Credit Agreement, dated as of December 9, 2019

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.

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

September 13, 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): September 13, 2021 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 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 29, 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 29, 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

June 29, 2021 EX-1.1

Underwriting Agreement relating to the 2023 Bonds, dated June 22, 2021, between Ameren Illinois and the several underwriters named therein, for whom RBC Capital Markets, LLC, TD Securities (USA) LLC, Truist Securities, Inc. and Wells Fargo Securities, LLC are acting as representatives.

EX-1.1 2 tm2120168d7ex1-1.htm EXHIBIT 1.1 Exhibit 1.1 Ameren Illinois Company First Mortgage Bonds due 2023 Underwriting Agreement June 22, 2021 RBC Capital Markets, LLC TD Securities (USA) LLC Truist Securities, Inc. Wells Fargo Securities, LLC As Representatives of the several Underwriters named in Schedule I to the applicable Pricing Agreement c/o RBC Capital Markets, LLC Brookfield Place 200 V

June 29, 2021 EX-1.2

Underwriting Agreement relating to the 2051 Bonds, dated June 22, 2021, between Ameren Illinois and the several underwriters named therein, for whom RBC Capital Markets, LLC, TD Securities (USA) LLC, Truist Securities, Inc. and Wells Fargo Securities, LLC are acting as representatives.

Exhibit 1.2 Ameren Illinois Company First Mortgage Bonds due 2051 Underwriting Agreement June 22, 2021 RBC Capital Markets, LLC TD Securities (USA) LLC Truist Securities, Inc. Wells Fargo Securities, LLC As Representatives of the several Underwriters named in Schedule I to the applicable Pricing Agreement c/o RBC Capital Markets, LLC Brookfield Place 200 Vesey Street, 8th Floor New York, New York

June 29, 2021 EX-4.2

Supplemental Indenture, dated as of June 1, 2021, to Ameren Illinois Mortgage for 0.375% First Mortgage Bonds due 2023 and 2.90% First Mortgage Bonds due 2051

Exhibit 4.2 WHEN RECORDED MAIL TO: Ameren Illinois Company Craig W. Stensland One Ameren Plaza (MC 1310) 1901 Chouteau Avenue St. Louis, MO 63103 AMEREN ILLINOIS COMPANY (SUCCESSOR TO ILLINOIS POWER COMPANY) TO THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. AS SUCCESSOR TRUSTEE TO HARRIS TRUST AND SAVINGS BANK SUPPLEMENTAL INDENTURE DATED AS OF JUNE 1, 2021 TO GENERAL MORTGAGE INDENTURE AND DEED

June 23, 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) ? Ameren Illinois Company 0.

June 23, 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) ? Ameren Illinois Company 2.

June 22, 2021 FWP

Ameren Illinois Company Pricing Term Sheet June 22, 2021

Filed Pursuant to Rule 433 Registration No. 333-249475-02 Ameren Illinois Company Pricing Term Sheet June 22, 2021 Issuer: Ameren Illinois Company Issue: 2.90% First Mortgage Bonds due 2051 (the ?Bonds?) Principal Amount: $350,000,000 Coupon (Interest Rate): 2.90% per annum Maturity Date: June 15, 2051 Benchmark Treasury: 1.875% due February 15, 2051 Benchmark Treasury Price: 94-19+ Benchmark Trea

June 22, 2021 FWP

Ameren Illinois Company Pricing Term Sheet June 22, 2021

Filed Pursuant to Rule 433 Registration No. 333-249475-02 Ameren Illinois Company Pricing Term Sheet June 22, 2021 Issuer: Ameren Illinois Company Issue: 0.375% First Mortgage Bonds due 2023 (the ?Bonds?) Principal Amount: $100,000,000 Coupon (Interest Rate): 0.375% per annum Maturity Date: June 15, 2023 Benchmark Treasury: 0.125% due May 31, 2023 Benchmark Treasury Price: 99-25 Benchmark Treasury

June 22, 2021 424B3

SUBJECT TO COMPLETION, DATED JUNE 22, 2021

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

June 22, 2021 424B3

SUBJECT TO COMPLETION, DATED JUNE 22, 2021

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

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 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-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-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

EX-10.26 9 aee202010-kexhibit1026.htm CHANGE OF CONTROL SEVERANCE PLAN Exhibit 10.26 SCHEDULE I CHANGE OF CONTROL SEVERANCE PLAN PARTICIPANTS SECTION 16 OFFICERS Benefit Level¹ - 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

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 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 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-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 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-24.3

Powers of Attorney with respect to Ameren Illinois

EX-24.3 19 aee202010-kxexhibit243.htm 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, 2020; and WHERE

February 22, 2021 EX-4.93

Description of Ameren Securities

EX-4.93 4 aee202010-kexhibit493.htm 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 (“comm

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-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-24.2

Powers of Attorney with respect to Ameren Missouri

EX-24.2 18 aee202010-kexhibit242.htm 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, 2020; and WHEREAS,

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

EX-10.44 11 aee202010-kexhibit1044.htm 2021 PERFORMANCE SHARE UNIT AWARD AGREEMENT 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 C

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-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

November 23, 2020 EX-1.1

Underwriting Agreement, dated November 9, 2020, between Ameren Illinois and the several underwriters named therein, for whom Mizuho Securities USA LLC, SMBC Nikko Securities America, Inc. and Truist Securities, Inc. are acting as representatives.

EX-1.1 Exhibit 1.1 Ameren Illinois Company First Mortgage Bonds Underwriting Agreement November 9, 2020 Mizuho Securities USA LLC SMBC Nikko Securities America, Inc. Truist Securities, Inc. As Representatives of the several Underwriters named in Schedule I to the applicable Pricing Agreement c/o Mizuho Securities USA LLC 1271 Avenue of the Americas New York, New York 10020 SMBC Nikko Securities Am

November 23, 2020 EX-4.2

Supplemental Indenture, dated as of November 1, 2020, to Ameren Illinois Mortgage for 1.55% First Mortgage Bonds due 2030

EX-4.2 3 d17843dex42.htm EX-4.2 Exhibit 4.2 WHEN RECORDED MAIL TO: Ameren Illinois Company Craig W. Stensland One Ameren Plaza (MC 1310) 1901 Chouteau Avenue St. Louis, MO 63103 AMEREN ILLINOIS COMPANY (SUCCESSOR TO ILLINOIS POWER COMPANY) TO THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. AS SUCCESSOR TRUSTEE TO HARRIS TRUST AND SAVINGS BANK SUPPLEMENTAL INDENTURE DATED AS OF NOVEMBER 1, 2020 TO

November 23, 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): November 23, 2020 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 10, 2020 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) Ameren Illinois Company 1.

November 9, 2020 424B3

SUBJECT TO COMPLETION, DATED NOVEMBER 9, 2020

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

November 9, 2020 FWP

Ameren Illinois Company Pricing Term Sheet November 9, 2020

FWP 1 a20-352383fwp.htm FWP Filed Pursuant to Rule 433 Registration No. 333-249475-02 Ameren Illinois Company Pricing Term Sheet November 9, 2020 Issue: 1.55% First Mortgage Bonds due 2030 Principal Amount: $375,000,000 Coupon (Interest Rate): 1.55% per annum Maturity Date: November 15, 2030 Benchmark Treasury: 0.625% due August 15, 2030 Benchmark Treasury Price: 97-00+ Benchmark Treasury Yield: 0

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-24.1

Ameren Power of Attorney.

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 of the Company (the “Subsidiary Registrants”)

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-25.5

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.

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 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-25.1

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-25.4

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.

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 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.

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) 95-

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-

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

May 11, 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 March 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 registrant as spe

March 26, 2020 DEF 14C

AIL / Ameren Illinois Co DEF 14C - - DEFINITIVE INFORMATION STATEMENTS

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March 26, 2020 DEF 14C

AIL / Ameren Illinois Co DEF 14C - - DEFINITIVE INFORMATION STATEMENTS

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 Statement ☐

March 26, 2020 DEFA14C

AIL / Ameren Illinois Co DEFA14C - - DEFINITIVE ADDITIONAL INFORMATION STATEMENT MATERIALS INCLUDING RULE 14(A)(12)

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 ☒ Definitive Additi

February 28, 2020 EX-10.6

*Summary Sheet of Ameren Corporation Non-Management Director Compensation effective as of January 1, 202

Exhibit 10.6 Summary Sheet of Ameren Corporation Non-Management Director Compensation Effective Date: January 1, 2020 $100,000 Base cash annual retainer payable in twelve equal installments Approximately $145,000 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 28, 2020 EX-10.17

*2020 Ameren Short-Term Incentive Plan

EX-10.17 7 aee201910-kxexhibit1017.htm 2020 AMEREN EXECUTIVE INCENTIVE PLAN Exhibit 10.17 2020 Ameren Short-Term Incentive Plan Plan Summary Effective January 1, 2020 Contents Page Summary 3 Eligibility 3 Award Opportunities 3 Plan Structure 3 Annual Performance Metrics 3 Base Award 5 Individual Performance Modifier 5 Individual Short-Term Incentive Payout 5 Impact of Events 6 Confidentiality and

February 28, 2020 EX-4.93

Description of Ameren Missouri Securities

EX-4.93 4 aee201910-kexhibit493.htm DESCRIPTION OF AMEREN MISSOURI SECURITIES Exhibit 4.93 Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 As of January 31, 2020 (“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 preferr

February 28, 2020 EX-10.32

*Formula for Determining 2020 Target Performance Share Unit and Restricted Stock Unit Awards to be Issued to Named Executive Officers

EX-10.32 9 aee201910-kexhibit1032.htm FORMULA FOR DETERMINING 2020 TARGET PSU AND RSU AWARDS Exhibit 10.32 FORMULA FOR DETERMINING 2020 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 2020 will be determined in accordance with the

February 28, 2020 EX-10.23

*2020 Base Salary Table for Named Executive Officers

EX-10.23 8 aee201910-kexhibit1023.htm 2020 BASE SALARY TABLE FOR NAMED EXECUTIVE OFFICERS Exhibit 10.23 2020 BASE SALARY TABLE FOR NAMED EXECUTIVE OFFICERS The 2020 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 28, 2020 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, 2019 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 28, 2020 EX-10.41

*Form of Performance Share Unit Award Agreement for Awards Issued in 2020 pursuant to 2014 Omnibus Incentive Compensation Plan

EX-10.41 10 aee201910-kxexhibit1041.htm 2020 PERFORMANCE SHARE UNIT AWARD AGREEMENT Exhibit 10.41 2020 Performance Share Unit Award Agreement January 1, 2020 Ameren Corporation 2020 Performance Share Unit Award Agreement THIS AGREEMENT, effective as of the Grant Date set forth in the Notice of 2020 Performance Share Unit Awards ("Notice"), represents the grant of Performance Share Units by Ameren

February 28, 2020 EX-24.1

Powers of Attorney with respect to Ameren

EX-24.1 16 aee201910-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, 2019; and WHEREAS, ea

February 28, 2020 EX-10.42

*Form of Restricted Share Unit Award Agreement for Awards Issued in 2020 pursuant to 2014 Omnibus Incentive Compensation Plan

Exhibit 10.42 2020 Restricted Stock Unit Award Agreement January 1, 2020 59961097v.2 Ameren Corporation 2020 Restricted Stock Unit Award Agreement THIS AGREEMENT, effective as of the Grant Date set forth in the Notice of 2020 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 t

February 28, 2020 EX-21.1

Subsidiaries of Ameren

EX-21.1 12 aee201910-kxexhibit211.htm SUBSIDIARIES OF AMEREN Exhibit 21.1 SUBSIDIARIES OF AMEREN CORPORATION AT DECEMBER 31, 2019 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 AmerenEne

February 28, 2020 EX-4.94

Description of Ameren Illinois Securities

EX-4.94 5 aee201910-kexhibit494.htm DESCRIPTION OF AMEREN ILLINOIS SECURITIES Exhibit 4.94 Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 As of January 31, 2020 (“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 $

February 28, 2020 EX-24.2

Powers of Attorney with respect to Ameren Missouri

EX-24.2 17 aee201910-kexhibit242.htm 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, 2019; and WHEREAS,

February 28, 2020 EX-4.92

Description of Ameren Securities

EX-4.92 3 aee201910-kexhibit492.htm DESCRIPTION OF AMEREN SECURITIES Exhibit 4.92 Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 As of January 31, 2020 (“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 (“comm

February 28, 2020 EX-24.3

Powers of Attorney with respect to Ameren Illinois

EX-24.3 18 aee201910-kxexhibit243.htm 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, 2019; and WHERE

February 28, 2020 EX-4.79

Supplemental Indenture, dated as of December 15, 2019, to the Ameren Illinois Mortgage

Bureau County Exhibit 4.79 WHEN RECORDED MAIL TO: Ameren Illinois Company Craig W. Stensland One Ameren Plaza (MC 1310) 1901 Chouteau Avenue St. Louis, MO 63103 AMEREN ILLINOIS COMPANY (SUCCESSOR TO ILLINOIS POWER COMPANY) TO THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. AS SUCCESSOR TRUSTEE TO HARRIS TRUST AND SAVINGS BANK SUPPLEMENTAL INDENTURE DATED AS OF DECEMBER 15, 2019 TO GENERAL MORTGAGE

December 11, 2019 8-K

Entry into a Material Definitive Agreement

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 9, 2019 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identification Number 1-147

December 11, 2019 EX-10.2

Amended and Restated Credit Agreement, dated as of December 9, 2019, by and among Ameren, Ameren Illinois and JPMorgan Chase Bank, N.A., as agent, and the lenders party thereto.

EX-10.2 3 d838884dex102.htm EX-10.2 Exhibit 10.2 EXECUTION VERSION AMENDED AND RESTATED CREDIT AGREEMENT DATED AS OF DECEMBER 9, 2019, 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

December 11, 2019 EX-10.1

Amended and Restated Credit Agreement, dated as of December 9, 2019, by and among Ameren, Ameren Missouri and JPMorgan Chase Bank, N.A., as agent, and the lenders party thereto.

EX-10.1 Exhibit 10.1 EXECUTION VERSION AMENDED AND RESTATED CREDIT AGREEMENT DATED AS OF DECEMBER 9, 2019, 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 SECURITIES, LLC, as Joint Lea

November 26, 2019 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 26, 2019 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, 2019 EX-4.2

Supplemental Indenture, dated as of November 1, 2019, to the Ameren Illinois Mortgage for 3.25% First Mortgage Bonds due 2050

EX-4.2 Exhibit 4.2 WHEN RECORDED MAIL TO: Ameren Illinois Company Craig W. Stensland One Ameren Plaza (MC 1310) 1901 Chouteau Avenue St. Louis, MO 63103 AMEREN ILLINOIS COMPANY (SUCCESSOR TO ILLINOIS POWER COMPANY) TO THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. AS SUCCESSOR TRUSTEE TO HARRIS TRUST AND SAVINGS BANK SUPPLEMENTAL INDENTURE DATED AS OF NOVEMBER 1, 2019 TO GENERAL MORTGAGE INDENTUR

November 26, 2019 EX-1.1

Underwriting Agreement, dated November 18, 2019, between Ameren Illinois and the several underwriters named therein, for whom BNY Mellon Capital Markets, LLC, Goldman Sachs & Co. LLC and Mizuho Securities USA LLC are acting as representatives.

EX-1.1 2 d837927dex11.htm EX-1.1 Exhibit 1.1 Ameren Illinois Company First Mortgage Bonds Underwriting Agreement November 18, 2019 BNY Mellon Capital Markets, LLC Goldman Sachs & Co. LLC Mizuho Securities USA LLC As Representatives of the several Underwriters named in Schedule I to the applicable Pricing Agreement c/o BNY Mellon Capital Markets, LLC 240 Greenwich Street, 3 West New York, New York

November 19, 2019 424B2

CALCULATION OF REGISTRATION FEE Title of Class of Securities to be Registered Maximum Aggregate Offering Price Amount of Registration Fee(1) Ameren Illinois Company 3.25% First Mortgage Bonds due 2050 $298,518,000 $38,747.64

Use these links to rapidly review the document TABLE OF CONTENTS TABLE OF CONTENTS Table of Contents CALCULATION OF REGISTRATION FEE Title of Class of Securities to be Registered Maximum Aggregate Offering Price Amount of Registration Fee(1) Ameren Illinois Company 3.

November 18, 2019 FWP

Pricing Term Sheet

Filed Pursuant to Rule 433 Registration No. 333-222108-01 November 18, 2019 Pricing Term Sheet Issuer: Ameren Illinois Company Expected Ratings (Moody’s/S&P)*: A1 / A Trade Date: November 18, 2019 Settlement Date: November 26, 2019 (T+6)** Issue: 3.25% First Mortgage Bonds due 2050 Principal Amount: $300,000,000 Coupon (Interest Rate): 3.25% per annum Maturity Date: March 15, 2050 Benchmark Treasu

November 18, 2019 424B3

SUBJECT TO COMPLETION, DATED NOVEMBER 18, 2019

Use these links to rapidly review the document TABLE OF CONTENTS TABLE OF CONTENTS Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No.

November 8, 2019 EX-4.5

Ameren Illinois Indenture Company Order dated October 30, 2019,

EX-4.5 5 aee-2019q3xexhibit45.htm AMEREN ILLINOIS INDENTURE COMPANY ORDER Exhibit 4.5 Company Order (IP INDENTURE) October 30, 2019 The Bank of New York Mellon Trust Company, N.A., as Trustee 2 N. LaSalle Street, Suite 700 Chicago, Illinois 60602 Attention: Corporate Trust Ladies and Gentlemen: Application is hereby made to The Bank of New York Mellon Trust Company, N.A., a national banking associ

November 8, 2019 EX-4.3

Supplemental Indenture, dated as of October 15, 2019, to Ameren Illinois Mortgage for First Mortgage Bonds, Senior Notes Series CILCO-AA

Exhibit 4.3 WHEN RECORDED MAIL TO: Ameren Illinois Company Craig W. Stensland One Ameren Plaza (MC 1310) 1901 Chouteau Avenue St. Louis, MO 63103 AMEREN ILLINOIS COMPANY (SUCCESSOR TO ILLINOIS POWER COMPANY) TO THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. AS SUCCESSOR TRUSTEE TO HARRIS TRUST AND SAVINGS BANK SUPPLEMENTAL INDENTURE DATED AS OF OCTOBER 15, 2019 TO GENERAL MORTGAGE INDENTURE AND D

November 8, 2019 EX-4.2

Third Supplemental Indenture to the CILCO Indenture, dated as of October 15, 2019

Exhibit 4.2 THIRD SUPPLEMENTAL INDENTURE (CILCO INDENTURE) Dated as of October 15, 2019 THIS THIRD SUPPLEMENTAL INDENTURE to the Indenture referred to below is dated as of October 15, 2019 (“this Supplemental Indenture”) between AMEREN ILLINOIS COMPANY, an Illinois corporation (the “Company”), and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. (formerly The Bank of New York Trust Company, N.A.) (

November 8, 2019 EX-4.4

Fourth Supplemental Indenture to the Ameren Illinois Indenture, dated as of October 15, 2019

Exhibit 4.4 FOURTH SUPPLEMENTAL INDENTURE (IP INDENTURE) Dated as of October 15, 2019 THIS FOURTH SUPPLEMENTAL INDENTURE to the Indenture referred to below is dated as of October 15, 2019 (this “Supplemental Indenture”) between AMEREN ILLINOIS COMPANY, an Illinois corporation (the “Company”), and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. (formerly The Bank of New York Trust Company, N.A.) (t

November 8, 2019 EX-10.2

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

Exhibit 10.2 SCHEDULE I CHANGE OF CONTROL SEVERANCE PLAN PARTICIPANTS SECTION 16 OFFICERS Benefit Level1 - 3 Baxter, Warner L. Mark, Richard J. Diya, Fadi M. Moehn, Michael Lyons, Martin J. Benefit Level - 2 Amirthalingam, Bhavani 1 Benefit Levels are defined as a payment amount equal to a cash severance multiple of base pay, target short-term incentive award, short-term incentive award in year of

November 8, 2019 EX-4.6

establishing Senior Notes Series CILCO-AA (including the global note)

Exhibit 4.6 NOTWITHSTANDING ANY PROVISIONS HEREOF OR IN THE INDENTURE THIS NOTE IS NOT ASSIGNABLE OR TRANSFERABLE EXCEPT AS PERMITTED BY SECTION 16.04 OF THE INDENTURE DATED AS OF JUNE 1, 2006, AS AMENDED AND SUPPLEMENTED, BETWEEN AMEREN ILLINOIS COMPANY (AS SUCCESSOR TO CENTRAL ILLINOIS LIGHT COMPANY) AND THE BANK OF NEW YORK TRUST COMPANY, N.A. (NOW THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A

November 8, 2019 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, 2019 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 2, 2019 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, 2019 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 10, 2019 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ý Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended March 31, 2019 OR ¨ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to UNION ELECTRIC CO AMEREN CORP AMEREN ILLINOIS CO Commi

May 10, 2019 EX-10.1

Sign On and Retention Bonus Agreement, effective March 1, 2018, between Bhavani Amirthalingam and Ameren Services Company

EX-10.1 2 aee-2019q1xexhibit101.htm SIGN ON AND RETENTION BONUS AGREEMENT Exhibit 10.1 SIGN ON AND RETENTION BONUS AGREEMENT This Sign On and Retention Bonus Agreement (hereinafter “Agreement”) is entered into this 1st day of March, 2018, by and between Bhavani Amirthalingam (“Employee”) and Ameren Services Company (the “Company”), a Missouri corporation, on behalf of itself and its parents, subsi

May 6, 2019 8-K

Current Report

8-K 1 d663937d8k.htm 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 2, 2019 Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number IRS Employer Identif

March 19, 2019 DEFA14C

AIL / Ameren Illinois Co DEFINITIVE ADDITIONAL INFORMATION STATEMENT MATERIALS INCLUDING RULE 14(A)(12)

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 ☒ Definitive Additi

March 19, 2019 DEF 14C

AIL / Ameren Illinois Co DEFINITIVE INFORMATION STATEMENTS

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 Statement ☐

March 19, 2019 DEF 14C

AIL / Ameren Illinois Co DEFINITIVE INFORMATION STATEMENTS

begin 644 ailllcourtesy-pdf.pdf M)5!$1BTQ+C0-)>+CS],-"C0Q,2 P(&]B:@T\/"],:6YE87)I>F5D(#$O3" Q M,34Y-S@T+T\@-#$S+T4@,3')E9@T*, T*)25%3T8-"B @(" @(" -"C0U,R P(&]B:@T\/"]& M:6QT97(O1FQA=&5$96-O9&4O22 S-S >^T2Z-WW\A^OM^["Q0 &(#@ MQS [email protected] 'N1#CS45!(/J+ 0>;M(%(C9H2]6\.DY$4Z'9W;P^/'N&'P.0R/J M9GAE8U@>M ^&=\/Y8O4W<'5;+DW$'NFQ%-==?-T=^=HR:7*JD?)3?=3 M.T(2JP:<+5^/[BU/V/(<3'W$!#[email protected]+3TA+95.2DSC>

February 26, 2019 10-K

Annual Report - 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (X) Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the fiscal year ended December 31, 2018. 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

February 26, 2019 EX-24.2

Powers of Attorney with respect to Ameren Missouri

EX-24.2 15 aee201810-kexhibit242.htm 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, 2018; and WHEREAS,

February 26, 2019 EX-10.35

*Form of Restricted Stock Unit Award Agreement for Awards Issued in 2019 pursuant to 2014 Omnibus Incentive Compensation Plan

Exhibit 10.35 2019 Restricted Stock Unit Award Agreement January 1, 2019 Ameren Corporation 2019 Restricted Stock Unit Award Agreement THIS AGREEMENT, effective as of the Grant Date set forth in the Notice of 2019 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 26, 2019 EX-10.22

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

EX-10.22 5 aee201810-kexhibit1022.htm CHANGE OF CONTROL SEVERANCE PLAN Exhibit 10.22 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. Nelson, Gregory L. Benefit Level - 2 Amirthalingam, Bhavani 1 Benefit Levels are defined as a payment amount equal to a cash severance mult

February 26, 2019 EX-10.14

*2019 Ameren Executive Incentive Plan

Exhibit 10.14 2019 Ameren Executive Incentive Plan for Officers Plan Summary Effective January 1, 2019 1 Contents Page Summary 3 Eligibility 3 Award Opportunities 3 Plan Structure 3 Annual Performance Metrics (EPS, Safety & Operational) 3 Base Award 4 Individual Performance Modifier 4 Individual Short-Term Incentive Payout 5 Impact of Events 6 Confidentiality and Non-Solicitation Obligations 7 Con

February 26, 2019 EX-21.1

Subsidiaries of Ameren

EX-21.1 10 aee201810-kxexhibit211.htm SUBSIDIARIES OF AMEREN Exhibit 21.1 SUBSIDIARIES OF AMEREN CORPORATION AT DECEMBER 31, 2018 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 AmerenEne

February 26, 2019 EX-10.36

*Ameren Corporation Severance Plan for Ameren Officers, effective January 1, 2019

EX-10.36 9 aee201810-kxexhibit1036.htm AMEREN CORPORATION SEVERANCE PLAN FOR AMEREN OFFICERS Exhibit 10.36 Ameren Corporation Severance Plan for Ameren Officers Plan and Summary Plan Description Amended and Restated Effective January 1, 2019 Table of Contents Section Page Introduction 3 Purpose 3 Effective Date 3 Definitions 3 Eligibility 4 Severance Pay and Benefits 4 Severance Pay 4 Medical Cont

February 26, 2019 EX-10.27

*Formula for Determining 2019 Target Performance Share Unit and Restricted Stock Unit Awards to be Issued to Named Executive Officers

EX-10.27 6 aee201810-kxexhibit1027.htm FORMULA FOR DETERMINING 2019 TARGET PSU AND RSU AWARDS Exhibit 10.27 FORMULA FOR DETERMINING 2019 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 2019 will be determined in accordance with the

February 26, 2019 EX-10.19

*2019 Base Salary Table for Named Executive Officers

EX-10.19 4 aee201810-kxexhibit1019.htm 2019 BASE SALARY TABLE FOR NAMED EXECUTIVE OFFICERS Exhibit 10.19 2019 BASE SALARY TABLE FOR NAMED EXECUTIVE OFFICERS The 2019 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 o

February 26, 2019 EX-24.1

Powers of Attorney with respect to Ameren

EX-24.1 14 aee201810-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, 2018; and WHEREAS, ea

February 26, 2019 EX-24.3

Powers of Attorney with respect to Ameren Illinois

EX-24.3 16 aee201810-kxexhibit243.htm 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, 2018; and WHERE

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