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AMEREN CORP

Regulatory Filings Oct 27, 2023

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11-K/A 1 d559344d11ka.htm 11-K/A 11-K/A

Table of Contents

UNITED STATES

SECURITIES AND EXCHANGE COMMISISION

WASHINGTON, DC 20549

FORM 11-K/A

Amendment No. 1

☒ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2021

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

COMMISSION FILE NUMBER 1-14756

A. Full title of the plan and the address of the plan, if different from that of the issuer named below:

AMEREN CORPORATION

SAVINGS INVESTMENT PLAN

B. Name of issuer of securities held pursuant to the plan and the address of its principal executive office:

Ameren Corporation

1901 Chouteau Avenue

St. Louis, Missouri 63103

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EXPLANATORY NOTE

This Amendment No. 1 on Form 11-K/A (the “Amendment”) is being filed by the Ameren Corporation Savings Investment Plan (the “Plan”) to amend its Annual Report on Form 11-K for the fiscal year ended December 31, 2021, as filed with the U.S. Securities and Exchange Commission on June 24, 2022 (the “Original Filing”). The sole purpose of this Amendment is to include Schedule G Part III - Nonexempt Transactions and update the Report of Independent Registered Public Accounting Firm dated June 24, 2022. The Report of Independent Registered Public Accounting Firm included in the Amendment is dated June 24, 2022, except for Schedule G, as to which the date is October 27, 2023. Other than the revisions to Schedule G Part III and the Report of Independent Registered Public Accounting Firm, no other items included in the Original Filing, including financial statements and footnotes, have been amended. Further, the Amendment does not purport to provide an update or a discussion of any other developments with respect to the Plan subsequent to the filing date of the Original Filing.

Table of Contents

Ameren Corporation Savings Investment Plan

Financial Statements and Supplemental Schedule

December 31, 2021 and 2020

Index

Report of Independent Registered Public Accounting Firm
December 31, 2021 and 2020 1-2
Financial Statements
Statements of Net Assets Available for Benefits
December 31, 2021 and 2020 3
Statements of Changes in Net Assets Available for Benefits
Years Ended December 31, 2021 and 2020 4
Notes to Financial Statements
December 31, 2021 and 2020 5-15
Supplemental Schedules*
Schedule G, Part III - Schedule of Nonexempt Transactions 1
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)
December 31, 2021 1-7
  • Other schedules required by 29 CFR 2520.103-10 of the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974 (“ERISA”), as amended, have been omitted because they are not applicable.

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Crowe LLP Independent Member Crowe Global

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Plan Participants and Plan Administrator of the Ameren Corporation Savings Investment Plan

St. Louis, Missouri

Opinion on the Financial Statements

We have audited the accompanying statements of net assets available for benefits of Ameren Corporation Savings Investment Plan (the “Plan”) as of December 31, 2021 and 2020, the related statements of changes in net assets available for benefits for the years then ended, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the net assets available for benefits of the Plan as of December 31, 2021 and 2020, and the changes in net assets available for benefits for the years then ended, in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on the Plan’s financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (“PCAOB”) and are required to be independent with respect to the Plan in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Plan is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Plan’s internal control over financial reporting. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

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Supplemental Information

The supplemental Schedule H, Line 4i – Schedule of Assets (Held at End of Year) as of December 31, 2021 and Schedule G, Part III – Schedule of Nonexempt Transactions for the year ended December 31, 2021 have been subjected to audit procedures performed in conjunction with the audit of Ameren Corporation Savings Investment Plan’s financial statements. The supplemental schedules are the responsibility of the Plan’s management. Our audit procedures included determining whether the information presented in the supplemental schedules reconciles to the financial statements or the underlying accounting and other records, as applicable, and performing procedures to test the completeness and accuracy of the information presented in the supplemental schedules. In forming our opinion on the supplemental schedules, we evaluated whether the supplemental schedules, including their form and content, are presented in conformity with the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. In our opinion, the supplemental schedules are fairly stated in all material respects in relation to the financial statements as a whole.

/s/ Crowe LLP

Crowe LLP

We have served as the Plan’s auditor since 2014.

Oak Brook, Illinois

June 24, 2022, except for supplemental Schedule G, Part III - Schedule of Nonexempt Transactions, as to which the date is October 27, 2023.

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Ameren Corporation

Savings Investment Plan

Statements of Net Assets Available for Benefits

December 31, 2021 and 2020

2021 2020
Assets
Investments, at fair value $ 2,958,712,609 $ 2,667,860,978
Investments, at contract value 315,902,740 321,003,883
Total investments 3,274,615,349 2,988,864,861
Cash 1,185,436 1
Receivables
Notes receivable from participants 34,180,853 33,994,821
Participant contributions 2,544,730 3,127,852
Employer contributions 2,513,821 623,687
Dividends and interest 283,040 315,588
Due from brokers for securities sold 5,566,474 9,034,431
Total receivables 45,088,918 47,096,379
Total assets 3,320,889,703 3,035,961,241
Liabilities
Accrued expenses 782,992 662,737
Due to brokers for securities purchased 8,758,186 9,475,458
Total liabilities 9,541,178 10,138,195
Net assets available for benefits $ 3,311,348,525 $ 3,025,823,046

The accompanying notes are an integral part of these financial statements.

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Ameren Corporation

Savings Investment Plan

Statements of Changes in Net Assets Available for Benefits

Years Ended December 31, 2021 and 2020

2021 2020
Additions:
Investment income
Interest and dividends $ 40,452,598 $ 20,377,636
Net appreciation in fair value of investments 388,465,986 372,577,335
Total investment income 428,918,584 392,954,971
Interest on notes receivable from participants 1,532,924 1,841,308
Participant contributions 110,696,275 109,954,566
Employer contributions 40,200,465 37,612,346
Total additions 581,348,248 542,363,191
Deductions:
Benefits paid to participants 291,477,964 217,709,502
Administrative expenses 4,344,805 3,486,596
Total deductions 295,822,769 221,196,098
Net increase 285,525,479 321,167,093
Net assets available for benefits
Beginning of year 3,025,823,046 2,704,655,953
End of year $ 3,311,348,525 $ 3,025,823,046

The accompanying notes are an integral part of these financial statements.

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Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2021 and 2020

  1. Description of the Plan

General

The following is a summary of the various provisions of the Ameren Corporation Savings Investment Plan (the “Plan”). Participants should refer to the Summary Plan Document for more complete information.

The Plan is a defined contribution plan. Its purpose is to provide employees eligible to participate (the “Participants”) of Ameren Corporation (the “Company”) and its wholly owned subsidiaries the opportunity to defer a portion of their compensation for federal income tax purposes in accordance with Section 401(k) of the Internal Revenue Code (the “Code”). The Plan is subject to certain provisions of the Employee Retirement Income Security Act of 1974 (“ERISA”), as amended, and regulations of the Securities and Exchange Commission.

The Company serves as sponsor of the Plan, and, consequently, has the authority to amend or terminate the Plan subject to certain restrictions. The Ameren Administrative Committee has the authority and responsibility for the general administration of the Plan. Fidelity Management Trust Company (“Fidelity”), as Trustee, has the authority and responsibility to hold and protect the assets of the Plan in accordance with Plan provisions and with the Trust and Administrative Agreement.

Participation

All regular full-time employees are eligible to participate in the Plan upon employment. Part-time or temporary employees are eligible to participate in the Plan upon completion of a year of service with at least 1,000 hours of service or effective January 1, 2021, if they complete three consecutive 12-month periods, each with at least 500 hours of service.

Employees covered by a collective bargaining agreement (“CBA”) are eligible to participate only if the CBA provides for such participation.

If employees do not make an election, nor opt-out within 30 days of employment, they are automatically enrolled at a 6% pre-tax contribution rate, invested in a Target Date fund based upon the date at which the Participant is or will be age 65, and further enrolled in auto-escalation increasing their pre-tax contribution 1% annually, with no cap on the annual increases. Employees may opt-out or make alternative elections at any time.

Contributions

Each year, Participants may contribute up to 100% of eligible compensation, as defined in the Plan, and subject to annual limitations imposed by the Code.

The Company makes an Employer Basic Matching Contribution plus an Employer Additional Matching Contribution in an amount equal to a percent of the amount each Participant contributes to the Plan, up to a certain maximum percentage of the Participant’s compensation that he or she elects to contribute to the Plan each year. The amount of Company matching contribution depends on the Participant’s employment classification, and for contract employees is determined by the collective bargaining agreement with the specific union representing the Participants. The Company also makes true-up Employer Basic Matching Contributions for Participants who contribute the IRS maximum before the end of the year and, as a result, do not receive the full company match. The Employer Additional Matching Contributions are invested in the Ameren Stock Fund.

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Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2021 and 2020

The Plan permits annual “catch-up” contributions for all employees age 50 and older. For eligible employees, the additional “catch-up” contribution is limited to $6,500 in 2021 and 2020. The Company does not match “catch-up” contributions.

Participants direct the investment of their contributions and the Employer Basic Matching Contributions to his or her account to any of the investment options available under the Plan, including Company stock. Contributions may be allocated to a single investment option or allocated in increments of one percent to any combination of investment options. Such elections may be changed daily. Although the Employer Additional Matching Contributions are invested in the Ameren Stock Fund, they may be immediately reallocated to other funds at the participants’ discretion.

Earnings derived from the assets of any investment fund are reinvested in the fund to which they relate. Participants may elect daily to reallocate, by actual dollar or percentage in one percent increments, the value of their accounts between funds. Pending investment of the assets into any investment fund, the Trustee may temporarily make certain short-term investments.

Participant Accounts

Each Participant’s account is credited with the Participant’s contributions and an allocation of (a) the Company’s contributions, and (b) Plan earnings, and is charged with an allocation of administrative expenses. Allocations are based on Participant contributions, eligible compensation, Participant account balances, or specific Participant transactions, as defined. The benefit to which the Participant is entitled is the benefit which can be provided from the Participant’s account. Each Participant directs the investment of his or her account to any of the investment options available under the Plan. The Plan imposes certain restrictions on participant directed investments into the Ameren Stock Fund.

Notes Receivable from Participants

The Plan permits Participants to borrow from their accounts within the Plan. Such borrowings may be made subject to the following: (1) the minimum amount of the loan is $1,000, (2) the amount of the loan may not exceed the lesser of $50,000 or 50% of the vested amount in the Participant’s account, (3) the loan will bear a fixed interest rate and repayments will be made through mutual agreement subject to certain statutory repayment time limits, (4) each loan shall bear a reasonable interest rate as determined under policies established for the Plan and (5) such other rules and regulations as may be adopted by the Company. At December 31, 2021 and 2020, the interest rates on participant loans ranged from 4.00 percent to 10.50 percent.

Vesting

The amounts in Participants’ accounts, including Company contributions, are fully vested at all times.

Payment of Benefits

The total amount of a Participant’s account shall be distributed to the Participant according to one of the options as described in the Plan document and as elected by the Participant after termination of employment. All distributions shall be in the form of cash except that Participants may elect to have his or her interest in the Ameren Stock Fund distributed in shares of Ameren common stock.

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Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2021 and 2020

The Setting Every Community Up for Retirement Enhancement (SECURE) Act was enacted in December 2019 and most provisions in the law became effective January 1, 2020. In compliance with the law, the Company adopted the provision which affects distributions to former employees. Effective for Participants who turn age 70 1 ⁄ 2 after December 31, 2019, the Company will make required minimum distributions (“RMD”) no later than April 1 in the year after the participant reaches the age of 72. In compliance with the Coronavirus Aid, Relief, and Economic Security (CARES) Act, which was enacted in March 2020, the Company temporarily suspended RMDs for 2020.

Participants may withdraw certain basic contributions, rollover contributions and related earnings thereon upon reaching age 59 1/2, in the event of total disability or financial hardship as defined by the Plan or the Code. For purposes of distributions, the Participant’s account value will be determined as of the last business day coincident with or immediately preceding the day of distribution. Contributions to the Plan and investment income thereon are taxable to Participants upon distribution pursuant to the rules provided for under the Plan and the Code.

The Plan also allows, at the discretion of the Company, participants of the former Union Electric Company Employee Stock Ownership Plan and the former Ameren Corporation Employee Stock Ownership Plan for Certain Employees of AmerenCIPS, to receive certain distributions prior to termination of employment.

Plan Termination

The Company intends to continue the Plan indefinitely. However, the Company may at any time and for any reason, subject to ERISA and Internal Revenue Service regulations, suspend or terminate the Plan provided that such action does not retroactively adversely affect the rights of any Participant under the Plan.

  1. Summary of Significant Accounting Policies

Basis of Accounting

The accompanying financial statements of the Plan are prepared on the accrual basis of accounting, except that benefit payments to Participants are recorded upon distribution.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of changes in net assets available for benefits during the reporting period. Actual results could differ from those estimates.

Investment Valuation and Income Recognition

All investments are presented at fair value, except for fully benefit-responsive investment contracts, which are reported at contract value, as of December 31, 2021 and 2020. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. See Note 3 for discussion of fair value measurements.

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Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2021 and 2020

The Plan has direct investments in fully benefit-responsive investment contracts. Investments held by a defined contribution plan are required to be reported at fair value, except for fully benefit- responsive investment contracts. Contract value is the relevant measurement attribute for the portion of the net assets available for benefits of a defined contribution plan attributable to fully benefit-responsive investment contracts because contract value is the amount Participants normally would receive if they were to initiate permitted transactions under the terms of the Plan. Contract value represents contributions made under each contract, plus earnings, less participant withdrawals and administrative expenses.

Purchases and sales of securities are recorded on a trade date basis. Interest income is recorded on the accrual basis. Dividend income is recorded on the ex-dividend date. Net appreciation (depreciation) in fair value of investments includes the Plan’s gains and losses on investments bought and sold as well as held during the year.

Notes Receivable from Participants

Notes receivable from Participants are measured at their unpaid principal balance plus any accrued but unpaid interest, with no allowance for credit losses, as repayments of principal and interest are received through payroll deductions and the notes are collateralized by the Participants’ account balances. Delinquent participant loans are reclassified as distributions based upon the terms of the Plan document.

Administrative Expenses

Fees associated with administering the Plan are generally paid by the Plan. Trustee and recordkeeping fees are primarily paid via (1) flat dollar fees that are assessed to all Participants quarterly, and (2) fees accrued in investment funds that are separately-managed accounts (versus commingled funds). Also, revenue sharing payments that Fidelity receives from mutual funds are allocated to Participant accounts quarterly.

Risks and Uncertainties

Investments are exposed to various risks, such as interest rate, market and credit risks, which includes global events such as pandemics. Due to the level of risk associated with certain investments and the level of uncertainty related to changes in the value of investments, it is at least reasonably possible that changes in risks in the near term could materially affect the Participants’ account balances and the amounts reported in the Statements of Net Assets Available for Benefits.

Concentrations

Company common stock comprised 11% of investments at December 31, 2021 and 2020.

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Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2021 and 2020

  1. Fair Value Measurements

The authoritative guidance issued by the Financial Accounting Standards Board (the “FASB”) regarding fair value measurement provides a framework for measuring fair value for all assets and liabilities that are measured and reported at fair value. The guidance defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Certain assumptions that market participants would use in pricing the asset or liability, including assumptions about risk or the risks inherent in the inputs to the valuation, were used in the valuation process. Inputs to valuation can be readily observable, market corroborated, or unobservable. Valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs were used. The provisions also establish a fair value hierarchy that prioritizes the inputs used to measure fair value. All financial assets and liabilities carried at fair value were classified in one of the following three hierarchy levels:

Level 1: Inputs based on quoted prices in active markets for identical assets or liabilities that the Plan has the ability to access at the reporting date.

Level 2: Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. Inputs to the valuation methodology include:

• Quoted prices for similar assets or liabilities in active markets;

• Quoted prices for identical or similar assets or liabilities in inactive markets;

• Inputs other than quoted prices that are observable for the asset or liability; and

• Inputs that are derived principally from or corroborated by observable market data by correlation or other means.

Level 3: Inputs to the valuation methodology that are unobservable and significant to the fair value measurement.

The Plan does not hold any investments requiring Level 3 measurements, and there have not been any transfers between measurement input levels in 2021 or 2020.

The asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement.

The following is a description of the valuation methodologies used for assets measured at fair value. There have been no changes in the methodologies used during 2021.

• Common stocks: Valued at the closing price reported on the U.S. active markets on which the individual securities are traded (Level 1 inputs).

• American depositary receipts (ADRs): Valued at the closing price reported on U.S. active markets on which the individual securities are traded (Level 1 inputs).

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Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2021 and 2020

• Collective trust funds: The fair values of participation units held in collective trusts are based on the Net Asset Value (“NAV”) reported by the fund managers as of the financial statement dates and recent transaction prices. Under ordinary market conditions, redemptions of investments in collective trusts are permitted daily and are executed at NAV as a practical expedient. The objective of the SSGA Short Term Investment Fund (value of $6,867,285 at December 31, 2021 and $7,292,977 at December 31, 2020) is to provide safety of principal, daily liquidity, and a competitive yield over the long term. The fund is invested in corporate bonds & notes, U.S. government agency obligations, short term instruments, and repurchase agreements. Units are typically purchased and redeemed at a constant NAV of $1.00 per unit. In the event that a significant disparity develops between the constant NAV and the fair value-based NAV, the fund trustee has the sole discretion to direct that the units be issued or redeemed at the fair value-based NAV until the disparity is deemed to be immaterial.

• Mutual funds: Valued at the daily closing price as reported by the fund (Level 1 inputs). Mutual funds held by the Plan are open-end mutual funds that are registered with the Securities and Exchange Commission. These funds are required to publish their daily NAV and to transact at that price. The mutual funds held by the Plan are deemed to be actively traded.

The following table sets forth, by level within the fair value hierarchy, Plan assets measured at fair value on a recurring basis as of December 31, 2021:

Quoted Prices — In Active Significant — Other Measured — at Net Asset
Markets for Observable Value as a
Identified Assets Inputs Practical
(Level 1) (Level 2) Expedient (a) Total
Assets
Common stocks-Plan sponsor stock $ 361,189,763 $ — $ — $ 361,189,763
Common stocks-other than Plan sponsor stock 449,097,788 — — 449,097,788
American depositary receipts (ADRs) 7,418,342 — — 7,418,342
Collective trust funds — — 1,923,814,690 1,923,814,690
Mutual funds 217,192,026 — — 217,192,026
Total assets reported at fair value $ 1,034,897,919 $ — $ 1,923,814,690 $ 2,958,712,609

(a) In accordance with accounting guidance, certain investments measured at NAV per share (or its equivalent) as a practical expedient have not been classified in the fair value hierarchy. The fair value amount measured at NAV presented in this table is intended to permit reconciliation of the fair value hierarchy to the investments at fair value presented in the statement of net assets available for benefits.

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Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2021 and 2020

The following table sets forth, by level within the fair value hierarchy, Plan assets measured at fair value on a recurring basis as of December 31, 2020:

Quoted Prices In Active Markets for Identified Assets (Level 1) Significant Other Observable Inputs (Level 2) Measured at Net Asset Value as a Practical Expedient (a) Total
Assets
Common stocks-Plan sponsor stock $ 331,644,311 $ — $ — $ 331,644,311
Common stocks-other than Plan sponsor stock 395,382,087 — — 395,382,087
Collective trust funds — — 1,681,624,551 1,681,624,551
Mutual funds 259,210,029 — — 259,210,029
Total assets reported at fair value $ 986,236,427 $ — $ 1,681,624,551 $ 2,667,860,978

(a) In accordance with accounting guidance, certain investments measured at NAV per share (or its equivalent) as a practical expedient have not been classified in the fair value hierarchy. The fair value amount measured at NAV presented in this table is intended to permit reconciliation of the fair value hierarchy to the investments at fair value presented in the statement of net assets available for benefits.

  1. Fully Benefit-Responsive Investment Contracts

The Plan holds investments in a separately-managed stable value account that is managed by Galliard Capital Management. The separately-managed account holds (1) an investment in the Wells Fargo/BlackRock Short Term Investment Fund, and (2) a portfolio of investment contracts, valued at $315,902,740 and $321,003,883 at December 31, 2021 and 2020, respectively. The investment contracts meet the fully benefit-responsive investment criteria and therefore are reported at contract value. Contract value is the relevant measure for fully benefit-responsive investment contracts because this is the amount received by Participants if they were to initiate permitted transactions under the terms of the Plan. Contract value represents contributions made under each contract, plus earnings, less participant withdrawals and administrative expenses.

The investment contracts (also referred to herein as “wrapper contracts”) are issued by the following insurance companies (also referred to herein as “contract issuer(s)”):

• American General Life Insurance Company (“AGL”)

• Transamerica Premier Life Insurance Company (“Transamerica”)

• Voya Retirement Insurance and Annuity Company (“Voya”)

• Massachusetts Mutual Life Insurance Company (“Mass Mutual”)

• Metropolitan Life Insurance Company (“Met Life”)

As of December 31, 2021 and 2020, the underlying investments of the AGL, Mass Mutual, Transamerica, Voya, and Met Life contracts are holdings in collective trust funds. The investment contracts include wrapper contracts, which are agreements for the contract issuer to make payments to the Plan under certain circumstances. The wrapper contracts typically include certain conditions and limitations on the underlying assets owned by the Plan. The wrapper contracts are designed to accrue interest based on crediting rates calculated under the terms of the wrapper contracts, and also provide a guarantee that the crediting rate will not fall below zero percent. Cash flow volatility (for example, timing of benefit payments) as well as asset underperformance are passed through to the Plan through adjustments to future wrapper contract crediting rates. Formulas are provided in each contract that adjusts renewal crediting rates to recognize the difference between the fair value of the underlying assets and the contract value. Crediting rates are reset at least quarterly.

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Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2021 and 2020

The Plan’s ability to receive amounts due in accordance with fully benefit-responsive investment contracts is dependent on the third-party contract issuer’s ability to meet its financial obligations. The contract issuer’s ability to meet its contractual obligations may be affected by future economic and regulatory developments.

Certain events might limit the ability of the Plan to transact at contract value. Investment contracts generally provide for withdrawals associated with certain events which are not in the ordinary course of operations. These withdrawals may be paid with a market value adjustment applied to the withdrawal as defined in the investment contract. Each contract issuer specifies the events which may trigger a market value adjustment; such events may include all or a portion of the following:

• material amendments to the Plan’s structure or administration;

• changes to the Plan’s competing investment options including the elimination of equity wash provisions;

• complete or partial termination of the stable value account, including a merger with another investment account;

• the failure of the Plan to qualify for exemption from federal income taxes or any required prohibited transaction exemption under ERISA;

• the redemption of all or a portion of the stable value account held by a participating plan at the direction of the participating plan sponsor, including withdrawals due to the removal of a specifically identifiable group of employees from coverage under the participating plan (such as a group layoff or early retirement incentive program), the closing or sale of a subsidiary, employing unit, or affiliate, the bankruptcy or insolvency of a Plan sponsor, the merger of the Plan with another plan, or the Plan sponsor’s establishment of another tax qualified defined contribution plan;

• any change in law, regulation, ruling, administrative or judicial position, or accounting requirement, applicable to the stable value account or participating plans;

• the delivery of any communication to Participants designed to influence a Participant’s decision to stop investing in this investment option; and

• the addition of an Asset Allocation or Managed Account service without prior approval of the contract issuer, or a material change in such service.

No events are probable of occurring that might limit the ability of the Plan to transact at contract value on behalf of the Participants.

These investment contracts are evergreen contracts and contain termination provisions, allowing the contract issuer to terminate with notice, at any time at fair value, and providing for automatic termination of the investment contract if the contract value or the fair value of the underlying portfolio equals zero. The contract issuer is obligated to pay the excess contract value when the fair value is below contract value at the time of termination and termination was caused by certain events including fraud or misconduct related to the investment contracts, such as material misrepresentations. In addition, if the Plan defaults in its obligations under the investment contract (including the contract issuer’s determination that the agreement constitutes a non-exempt prohibited transaction as defined under ERISA), and such default is not corrected within the time permitted by the investment contract, then the investment contract may be terminated by the contract issuer and the Plan will receive the fair value as of the date of termination.

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Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2021 and 2020

  1. Transactions with Parties-in-Interest

Parties-in-interest are defined under Department of Labor regulations as any fiduciary of the Plan, any party rendering service to the Plan, the employer, and certain others.

At December 31, 2021, the Plan held 4,057,856 shares of Company common stock with a cost and fair value of $195,230,194 and $361,189,763, respectively. During 2021, the Plan purchased 115,228 shares at a cost of $9,499,998 and sold 305,954 shares valued at $25,428,170.

At December 31, 2020, the Plan held 4,248,582 shares of Company common stock with a cost and fair value of $200,273,215 and $331,644,311, respectively. During 2020, the Plan purchased 194,005 shares at a cost of $14,549,836 and sold 375,108 shares valued at $30,078,581.

Dividend income from Company common stock was $9,075,371 and $8,541,913 for the years ended December 31, 2021 and December 31, 2020, respectively.

At December 31, 2021 and December 31, 2020, the Plan held shares in the Fidelity Institutional Money Market Government Portfolio. This portfolio is managed by the Trustee, and therefore, qualifies as party-in-interest transactions. Notes receivable from Participants also reflect party-in-interest transactions.

Fees paid by the Plan to the Trustee for recordkeeping, trust services, and advisory services were $1,618,503 and $1,482,653 for the years ended December 31, 2021 and December 31, 2020, respectively.

Fees paid to and investments issued by various Plan investment managers or affiliates of Plan investment managers also reflect party-in-interest transactions.

These transactions are allowable party-in-interest transactions under Section 408(b)(8) of ERISA.

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Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2021 and 2020

  1. Reconciliation of Financial Statements to Form 5500

The following is a reconciliation of net assets available for benefits per the financial statements to the Form 5500 at December 31, 2021 and 2020:

Net assets available for benefits per the financial statements 2021 — $ 3,311,348,525 $ 3,025,823,046
Amounts allocated to deemed distributions of notes receivable from Participants (1,989,544 ) (1,899,760 )
Adjustment from contract value to fair value for fully benefit-responsive investment
contracts 4,661,386 13,268,753
Net assets available for benefits per the Form 5500 $ 3,314,020,367 $ 3,037,192,039

Deemed distributions of notes receivable from Participants, resulting from defaults of notes receivable from Participants, are no longer considered assets of the Plan with respect to Form 5500 filings.

The following is a reconciliation of net increase in net assets available for benefits per the financial statements to net income per the Form 5500 for the year ended December 31, 2021:

Net increase in net assets available for benefits per the financial statements $
Adjustment from contract value to fair value for fully benefit-responsive investment contracts as
of the current year-end 4,661,386
Adjustment from contract value to fair value for fully benefit-responsive investment contracts as
of the prior year-end (13,268,753 )
Adjustment to prior year to defaulted notes receivables 2,604
Add: Net increase in defaulted notes receivable from Participants 43,579
Less: Interest income of defaulted notes receivable from Participants (135,967 )
Total net income per the Form 5500 $ 276,828,328

14

Table of Contents

Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2021 and 2020

  1. Federal Income Tax Status

The Company obtained a determination letter dated January 12, 2018, in which the Internal Revenue Service stated that the Plan was in compliance with the applicable requirements of the Code. Although the Plan has been amended since receiving this determination letter, the Plan’s administrator believes that the Plan is designed and is currently being operated in compliance with the applicable requirements of the Code.

Accounting principles generally accepted in the United States of America require Plan management to evaluate tax positions taken by the Plan and recognize a tax liability (or asset) if the Plan has taken an uncertain position that more likely than not would not be sustained upon examination by the Internal Revenue Service. The Plan administrator has analyzed the tax positions taken by the Plan, and has concluded that as of December 31, 2021 and 2020, there are no uncertain positions taken or expected to be taken that would require recognition of a liability (or asset) or disclosure in the financial statements. The Plan is subject to routine audits by taxing jurisdictions; however, there are currently no audits for any tax periods in progress. The Plan administrator believes it is no longer subject to income tax examinations for years prior to 2018.

  1. Subsequent Events

There were no subsequent events identified through June 24, 2022, the date the financial statements were issued.

15

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Ameren Corporation Savings Investment Plan

SCHEDULE G, PART III - Schedule of Nonexempt Transactions

For the year ended December 31, 2021

Name of plan sponsor: Ameren Corporation

Employer identification number: 43-1723446

Three-digit plan number: 003

(a) (b) (c) (d) (e)
Identity of party involved Relationship to plan, employer, or other party-in-interest Description of transaction including maturity date, rate of interest, collateral, par or maturity value Current value of asset Net gain (loss) on each transaction
Fidelity Investments Institutional Service Provider Excess compensation paid for recordkeeping services for 2021 plan year was $300,817 - VFCP filed $ 300,817 $ 60,338

1

Table of Contents

Ameren Corporation Savings Investment Plan

SCHEDULE H, Line 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)

December 31, 2021

Name of plan sponsor: Ameren Corporation

Employer identification number: 43-1723446

Three-digit plan number: 003

(a) (b) (c) (e)
Identity of issue, borrower, Description of investment including maturity date, Current
lessor, or similar party rate of interest, collateral, par, or maturity
value Cost value
Interest-bearing Cash
State Street Global Advisors SSGA Short Term Investment Fund $ 6,867,284.56 $ 6,867,284.56
Total Interest-bearing Cash 6,867,284.56 6,867,284.56
Mutual Funds
American Funds Group EuroPacific Growth Fund 95,980,360.23 125,253,683.16
* Sands Capital Management Touchstone Sands Capital Institutional Growth Fund 53,654,710.65 66,442,591.46
* Pacific Investment Management Company PIMCO Income Institutional Fund 22,822,238.96 22,885,120.24
* Fidelity Management Trust Company Fidelity Institutional Money Market Government Portfolio 2,610,630.73 2,610,630.73
Total Mutual Funds 175,067,940.57 217,192,025.59
Collective Investment Trusts
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index Retirement Fund O 85,334,639.48 97,590,295.68
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2025 Fund O 114,197,934.04 133,258,789.53
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2030 Fund O 109,080,087.66 131,992,374.59
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2035 Fund O 64,175,817.98 80,608,943.89
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2040 Fund O 71,179,209.72 91,496,229.78
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2045 Fund O 68,386,652.48 90,588,672.81
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2050 Fund O 64,820,477.44 86,272,691.89
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2055 Fund O 43,939,433.93 57,780,093.69
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2060 Fund O 14,339,857.30 17,797,960.50
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2065 Fund O 1,757,095.64 1,981,532.98
* BlackRock Institutional Trust Company, N.A. BlackRock Equity Index Fund F 297,917,651.83 431,646,852.53
* BlackRock Institutional Trust Company, N.A. BlackRock Russell 2500 Index Fund F 129,199,682.20 182,851,704.92
* BlackRock Institutional Trust Company, N.A. BlackRock MSCI ACWI ex-US IMI Index Fund F 99,778,559.67 112,498,346.24
* BlackRock Institutional Trust Company, N.A. BlackRock US Debt Index Fund F 67,385,613.85 66,473,819.72
* BlackRock Institutional Trust Company, N.A. BlackRock TIPS Bond Index Fund M 30,191,816.59 34,031,611.88
* Wells Fargo Bank, N.A. Wells Fargo Fixed Income Fund F 121,639,476.85 131,757,906.00
* Wells Fargo Bank, N.A. Wells Fargo Fixed Income Fund L 170,025,574.58 188,806,220.00
* Wells Fargo Bank, N.A. Wells Fargo/BlackRock Short Term Investment Fund 24,312,260.00 24,312,260.00
* Robeco Trust Company Boston Partners Large Cap Value Equity Fund E 76,861,885.55 135,324,670.92
* Hand Benefits and Trust Company Snyder Capital Small/Mid Cap Value Fund R1 43,742,816.29 71,887,830.33
* Wellington Management Company LLP Wellington CIF II Core Plus Bond Portfolio 67,005,158.25 68,552,723.75
Total Collective Investment Trusts 1,765,271,701.33 2,237,511,531.63
Common Stocks
* Ameren Corporation 4,057,856 Shares 195,230,193.62 361,189,762.56
SPOTIFY TECH SA 5,322 Shares 1,425,881.88 1,245,507.66
SHOPIFY INC CL A 3,192 Shares 2,868,844.96 4,396,628.88
ATLASSIAN CORP PLC CLS A 6,617 Shares 1,692,778.31 2,522,995.93
ADYEN BV 1,010 Shares 1,080,581.42 2,657,959.19
ADOBE INC 5,346 Shares 779,255.42 3,031,502.76
AIRBNB INC CLASS A 10,727 Shares 1,653,073.48 1,785,938.23
ALPHABET INC CL C 1,692 Shares 1,481,520.85 4,895,954.28
ALPHABET INC CL A 1,177 Shares 884,970.67 3,409,816.08
AMAZON.COM INC 2,396 Shares 3,885,580.41 7,989,078.64
APPLE INC 34,440 Shares 1,522,567.16 6,115,510.80
BIONTECH SE ADR 3,075 Shares 1,062,226.94 792,735.00
CARVANA CO CL A 3,608 Shares 993,489.21 836,298.32
CHIPOTLE MEXICAN GRILL IN 781 Shares 641,845.64 1,365,383.25
COSTCO WHOLESALE CORP 2,909 Shares 531,922.21 1,651,439.30
COSTAR GROUP INC 12,673 Shares 1,142,939.41 1,001,547.19
CROWDSTRIKE HLDGS INC 7,131 Shares 1,672,960.46 1,460,072.25
DANAHER CORP 7,019 Shares 1,172,145.41 2,309,321.19
DEXCOM INC 2,354 Shares 487,827.56 1,263,980.30
META PLATFORMS INC CL A 7,704 Shares 1,059,493.27 2,591,240.40
GOLDMAN SACHS GROUP INC 3,403 Shares 1,097,927.51 1,301,817.65
HOME DEPOT INC 6,156 Shares 1,085,883.89 2,554,801.56
HUBSPOT INC 868 Shares 605,833.21 572,142.20
HUMANA INC 2,975 Shares 1,145,835.16 1,379,983.50
INTUITIVE SURGICAL INC 4,383 Shares 860,034.49 1,574,811.90
KKR & CO INC 9,127 Shares 668,304.21 679,961.50
KERING UNSPONSORED ADR 20,872 Shares 1,126,382.07 1,680,404.72
ESTEE LAUDER COS INC CL A 6,995 Shares 1,203,156.45 2,589,549.00
LILLY (ELI) & CO 8,897 Shares 1,350,900.67 2,457,529.34

1

Table of Contents

Ameren Corporation Savings Investment Plan

SCHEDULE H, Line 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)

December 31, 2021

Name of plan sponsor: Ameren Corporation

Employer identification number: 43-1723446

Three-digit plan number: 003

(a) — Identity of issue, borrower, (c) — Description of investment including maturity date, Current
lessor, or similar party rate of interest, collateral, par, or maturity
value Cost value
LULULEMON ATHLETICA INC 5,636 Shares 1,155,004.62 2,206,212.20
MASTERCARD INC CL A 7,074 Shares 1,269,333.94 2,541,829.68
MATCH GROUP INC 11,311 Shares 1,247,433.22 1,495,879.75
MICROSOFT CORP 18,924 Shares 2,079,570.01 6,364,519.68
NETFLIX INC 7,483 Shares 1,908,847.04 4,508,058.52
NIKE INC CL B 18,345 Shares 1,255,903.39 3,057,561.15
NVIDIA CORP 22,929 Shares 1,178,544.84 6,743,648.19
PAYPAL HLDGS INC 8,135 Shares 1,052,330.17 1,534,098.30
ROBLOX CORP 10,538 Shares 834,556.24 1,087,100.08
S&P GLOBAL INC 4,425 Shares 977,883.50 2,088,290.25
SALESFORCE.COM INC 20,306 Shares 2,556,621.80 5,160,363.78
SNAP INC—A 29,653 Shares 1,684,019.70 1,394,580.59
SNOWFLAKE INC CL A 5,176 Shares 1,483,382.13 1,753,370.00
BLOCK INC CL A 9,241 Shares 1,876,837.62 1,492,513.91
TJX COMPANIES INC NEW 18,988 Shares 1,250,647.40 1,441,568.96
TESLA INC 8,115 Shares 1,488,644.03 8,575,769.70
TRADE DESK INC 18,765 Shares 715,259.87 1,719,624.60
TWILIO INC CLASS A 7,090 Shares 1,524,867.66 1,867,080.60
UBER TECH INC 56,384 Shares 2,309,484.84 2,364,181.12
UNION PACIFIC CORP 5,936 Shares 1,178,615.51 1,495,456.48
VERTEX PHARMACEUTICALS IN 5,264 Shares 857,908.13 1,155,974.40
VISA INC CL A 10,354 Shares 822,523.38 2,243,815.34
WORKDAY INC CL A 6,630 Shares 918,118.15 1,811,183.40
ZOOMINFO TECH INC 10,044 Shares 638,582.52 644,824.80
ADIENT PLC 32,908 Shares 1,478,579.95 1,575,635.04
AERCAP HLDGS NV 51,254 Shares 1,657,374.09 3,353,036.68
SUNCOR ENERGY INC 149,087 Shares 3,406,350.14 3,731,647.61
LIBERTY GLOBAL PLC CL C 141,689 Shares 3,072,021.73 3,980,044.01
AFFILIATED MANAGERS GRP I 15,259 Shares 1,973,192.62 2,510,258.09
AIR LEASE CORP CL A 41,133 Shares 1,373,464.22 1,819,312.59
ALLIANCE DATA SYS CORP 19,765 Shares 1,845,976.82 1,315,756.05
AMERIPRISE FIN INC 20,036 Shares 2,306,797.33 6,044,059.76
ARROW ELECTRONICS INC 26,509 Shares 1,893,107.96 3,559,363.43
ASSURANT INC 18,532 Shares 1,759,231.62 2,888,397.52
BERRY GLOBAL GROUP INC 50,108 Shares 1,782,002.14 3,696,968.24
BROADCOM INC 9,544 Shares 2,004,513.04 6,350,673.04
CIGNA CORP 17,634 Shares 4,382,281.26 4,049,295.42
CENTENE CORP 63,060 Shares 3,838,830.60 5,196,144.00
COMMSCOPE HLDG CO INC 57,993 Shares 1,300,542.47 640,242.72
CONCENTRIX CORP 11,307 Shares 672,390.32 2,019,656.34
CROWN HLDGS INC 40,337 Shares 2,299,428.46 4,462,078.94
FLEX LTD 159,504 Shares 2,198,037.58 2,923,708.32
DELL TECH INC CL C 54,648 Shares 1,145,905.46 3,069,578.16
EBAY INC 79,901 Shares 4,522,871.00 5,313,416.50
HCA HEALTHCARE INC 22,120 Shares 2,124,159.84 5,683,070.40
HANESBRANDS INC 129,531 Shares 1,616,704.07 2,165,758.32
LINCOLN NATIONAL CORP 64,709 Shares 2,841,883.90 4,417,036.34
LITHIA MOTORS INC CL A 7,970 Shares 2,563,950.14 2,366,691.50
LOYALTY VENTURES INC 7,805 Shares 419,698.50 234,696.35
NRG ENERGY INC 74,644 Shares 2,667,003.69 3,215,663.52
NORTONLIFELOCK INC 170,615 Shares 4,574,771.77 4,432,577.70
QURATE RETAIL INC 128,944 Shares 1,668,053.58 979,974.40
TD SYNNEX CORP 17,161 Shares 1,004,654.20 1,962,531.96
UNITED RENTALS INC 16,787 Shares 2,304,403.24 5,578,152.23
UNIVAR INC 64,426 Shares 657,167.55 1,826,477.10
VMWARE INC CL A 24,215 Shares 1,130,858.19 2,806,034.20
WESTERN DIGITAL CORP 63,634 Shares 3,194,842.14 4,149,573.14
WHIRLPOOL CORP 19,814 Shares 3,038,783.17 4,649,553.24
SENSATA TECH HLDGS PLC 7,222 Shares 417,674.99 445,525.18
ESSENT GROUP LTD 12,879 Shares 500,912.25 586,380.87
ORTHO CLINICAL DIAGNOSTIC 25,188 Shares 445,901.81 538,771.32
NOMAD FOODS LTD 11,964 Shares 259,246.28 303,765.96
AXALTA COATING SYS LTD 11,015 Shares 350,678.87 364,816.80
INTL GAME TECH PLC 6,699 Shares 53,463.85 193,668.09
NATIONAL ENERGY SVCS REUN 14,705 Shares 148,368.39 138,962.25

2

Table of Contents

Ameren Corporation Savings Investment Plan

SCHEDULE H, Line 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)

December 31, 2021

Name of plan sponsor: Ameren Corporation

Employer identification number: 43-1723446

Three-digit plan number: 003

(a) — Identity of issue, borrower, (c) — Description of investment including maturity date, Current
lessor, or similar party rate of interest, collateral, par, or maturity
value Cost value
ASSURED GUARANTY LTD 12,513 Shares 400,161.37 628,152.60
JAZZ PHARMA PLC 1,084 Shares 161,392.48 138,101.60
CENOVUS ENERGY INC 32,560 Shares 230,480.27 399,836.80
ENERPLUS CORP 41,598 Shares 201,186.11 440,106.84
ICON PLC 834 Shares 126,300.03 258,289.80
ACCO BRANDS CORP 28,131 Shares 322,761.11 232,362.06
ABM INDU INC 11,166 Shares 371,722.88 456,131.10
AGNC INVESTMENT CORP 17,630 Shares 300,356.72 265,155.20
AES CORP 19,309 Shares 347,922.25 469,208.70
ASGN INC 7,085 Shares 531,125.26 874,289.00
ALLEGHANY CORP DEL 671 Shares 408,504.03 447,952.89
ALLISON TRANSMISSION HLDG 7,831 Shares 320,883.47 284,656.85
ALTRA INDU MOTION CORP 3,363 Shares 193,770.42 173,429.91
AMERICAN EAGLE OUTFITTERS 8,081 Shares 219,558.65 204,610.92
AMERICOLD REALTY TR 4,370 Shares 159,345.89 143,292.30
AMERIS BANCORP 3,794 Shares 193,289.28 188,485.92
ARES COMMERCIAL REAL ESTA 8,881 Shares 118,339.88 129,129.74
ARROW ELECTRONICS INC 3,848 Shares 290,496.09 516,670.96
ARTISAN PARTNERS ASSET MA 8,239 Shares 437,750.31 392,505.96
ASSURANT INC 2,179 Shares 241,871.04 339,618.94
AVNET INC 7,440 Shares 296,535.90 306,751.20
BWX TECH INC 7,328 Shares 421,058.10 350,864.64
BANKUNITED INC 10,984 Shares 398,368.62 464,733.04
BELDEN INC 9,263 Shares 516,795.64 608,856.99
BLACKSTONE MORTGAGE TR CL 6,949 Shares 216,728.62 212,778.38
BLOCK H & R INC 7,136 Shares 178,065.17 168,124.16
BOOZ ALLEN HAMILTON HLDG 2,366 Shares 136,952.08 200,613.14
BRIGHT HEALTH GROUP INC 40,951 Shares 337,815.68 140,871.44
BRIGHTVIEW HLDGS INC 20,746 Shares 311,784.13 292,103.68
BRINKS CO 7,865 Shares 572,198.51 515,708.05
BUILDERS FIRSTSOURCE 4,202 Shares 84,524.76 360,153.42
CALLAWAY GOLF CO 27,579 Shares 812,359.71 756,767.76
CARTERS INC 2,058 Shares 205,887.03 208,310.76
CENTERPOINT ENERGY INC 9,387 Shares 193,363.40 261,991.17
CHAMPIONX CORP 16,946 Shares 221,080.06 342,478.66
CHANGE HEALTHCARE INC 43,964 Shares 881,138.45 939,950.32
CHEMED CORP 821 Shares 371,128.37 434,341.84
COLUMBIA BANKING SYS INC 6,111 Shares 209,264.50 199,951.92
COMMSCOPE HLDG CO INC 26,503 Shares 482,294.15 292,593.12
CONCENTRIX CORP 5,270 Shares 302,761.18 941,327.40
FRESH DEL MONTE PRODUCE I 15,500 Shares 432,754.83 427,800.00
COUSINS PROPERTIES INC 16,208 Shares 506,844.53 652,858.24
CROWN HLDGS INC 1,996 Shares 216,381.37 220,797.52
CURTISS WRIGHT CORPORATIO 3,353 Shares 359,286.50 464,960.51
WHITE MOUNTAINS INS GROUP 374 Shares 361,115.10 379,198.60
FLEX LTD 15,557 Shares 186,481.03 285,159.81
DELEK US HLDGS INC 21,430 Shares 452,594.68 321,235.70
DIAMONDBACK ENERGY INC 11,375 Shares 676,600.82 1,226,793.75
EVEREST REINSURANCE GROUP 1,446 Shares 334,575.51 396,088.32
AXIS CAPITAL HLDGS LTD 8,067 Shares 415,415.13 439,409.49
RENAISSANCERE HLDGS LTD 2,732 Shares 441,425.24 462,609.56
EAST WEST BANCORP INC 5,543 Shares 358,402.27 436,123.24
ECOVYST INC 14,406 Shares 230,618.25 147,517.44
EMCOR GROUP INC 1,886 Shares 134,147.54 240,257.54
EMPLOYERS HLDGS INC 5,353 Shares 217,095.75 221,507.14
ENERGIZER HLDGS INC 12,815 Shares 625,740.31 513,881.50
ENERSYS INC 5,015 Shares 371,988.48 396,485.90
ENVISTA HLDGS CORP 20,514 Shares 498,468.62 924,360.84
EVERCORE INC A 5,497 Shares 428,059.50 746,767.45
EVERTEC INC 8,409 Shares 253,466.48 420,281.82
FMC CORP NEW 3,927 Shares 336,239.46 431,538.03
FTI CONSULTING INC 1,493 Shares 142,400.48 229,056.06
FEDERAL AGRI MTG NON VTG 3,640 Shares 289,645.64 451,105.20
FIRST AMERICAN FIN CORP 2,952 Shares 155,726.70 230,934.96
FIRST CITIZENS BANCSHARES 373 Shares 164,077.63 309,530.32

3

Table of Contents

Ameren Corporation Savings Investment Plan

SCHEDULE H, Line 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)

December 31, 2021

Name of plan sponsor: Ameren Corporation

Employer identification number: 43-1723446

Three-digit plan number: 003

(a) — Identity of issue, borrower, (c) — Description of investment including maturity date, Current
lessor, or similar party rate of interest, collateral, par, or maturity
value Cost value
FIRST HAWAIIAN INC 14,922 Shares 363,147.60 407,818.26
FIRST HORIZON CORP 15,032 Shares 147,024.42 245,472.56
FIRST MERCHANTS CORP 5,990 Shares 249,068.02 250,921.10
FOOT LOCKER INC 13,888 Shares 519,097.92 605,933.44
FRONTDOOR INC 8,110 Shares 316,657.11 297,231.50
GLOBE LIFE INC 3,777 Shares 308,954.71 353,980.44
GRAFTECH INTL LTD 23,588 Shares 222,725.31 279,046.04
GRAPHIC PACKAGING HLDGS C 59,383 Shares 958,952.50 1,157,968.50
GRAY TELEVISION INC 11,044 Shares 255,058.95 222,647.04
HAEMONETICS CORP MASS 3,510 Shares 225,380.00 186,170.40
HANESBRANDS INC 12,148 Shares 115,086.95 203,114.56
HANOVER INSURANCE GROUP I 1,316 Shares 157,694.63 172,474.96
HARLEY-DAVIDSON INC 17,481 Shares 543,922.64 658,858.89
HARSCO CORP 15,813 Shares 217,619.19 264,235.23
HASBRO INC 3,242 Shares 296,315.04 329,970.76
HELMERICH & PAYNE INC 14,037 Shares 320,795.01 332,676.90
HILLENBRAND INC 5,762 Shares 142,944.21 299,566.38
HOLLYFRONTIER CORP 14,446 Shares 445,508.67 473,539.88
HOLOGIC INC 3,460 Shares 214,989.79 264,897.60
HOWMET AEROSPACE INC 6,681 Shares 113,229.95 212,656.23
HUB GROUP INC CL A 3,072 Shares 190,360.32 258,785.28
HUNTINGTON INGALLS INDU I 1,718 Shares 307,093.03 320,819.32
INGEVITY CORP 4,216 Shares 185,534.06 302,287.20
INGREDION INC 3,005 Shares 291,622.95 290,403.20
INSIGHT ENTERPRISES INC 6,596 Shares 362,393.64 703,133.60
INTERDIGITAL INC 6,578 Shares 395,679.23 471,182.14
INVESTORS BANCORP INC 22,909 Shares 311,643.36 347,071.35
JONES LANG LASALLE INC 854 Shares 93,339.39 230,016.36
KAR AUCTION SVCS INC 35,730 Shares 644,599.20 558,102.60
KOSMOS ENERGY LTD 104,259 Shares 349,411.25 360,736.14
LCI INDU 3,496 Shares 328,008.24 544,921.52
LPL FINL HLDGS INC 4,562 Shares 335,276.28 730,330.58
LANDSTAR SYS INC 999 Shares 116,223.80 178,840.98
LITHIA MOTORS INC CL A 928 Shares 117,436.77 275,569.60
STEVEN MADDEN LTD 13,157 Shares 429,436.76 611,405.79
MASONITE WORLDWIDE HLDGS 2,658 Shares 302,504.88 313,511.10
MERITAGE HOMES CORP 2,134 Shares 197,717.26 260,476.04
MIDLAND STATES BANCORP IN 7,904 Shares 210,600.58 195,940.16
MINERALS TECH INC 2,349 Shares 157,336.68 171,829.35
MOLINA HEALTHCARE INC 2,625 Shares 386,575.95 834,960.00
MOSAIC CO NEW 5,928 Shares 124,479.62 232,911.12
MR COOPER GROUP INC 9,571 Shares 106,005.13 398,249.31
NCR CORP 14,023 Shares 364,900.09 563,724.60
NMI HLDGS INC 9,034 Shares 181,391.00 197,392.90
NAVIENT CORP 14,778 Shares 164,069.08 313,589.16
NEXTIER OILFIELD SOLUTION 31,540 Shares 123,541.83 111,967.00
NEXSTAR MEDIA GROUP INC A 4,633 Shares 538,105.92 699,490.34
NORTONLIFELOCK INC 15,031 Shares 369,537.14 390,505.38
OMNICOM GROUP INC 4,085 Shares 294,412.52 299,307.95
OWENS CORNING INC 3,329 Shares 212,572.77 301,274.50
PDC ENERGY INC 8,425 Shares 334,397.75 410,971.50
PRA GROUP INC 6,369 Shares 253,621.08 319,787.49
PACWEST BANCORP 10,549 Shares 371,360.07 476,498.33
PENNYMAC FIN SVCS INC 5,423 Shares 314,371.10 378,416.94
PETIQ INC CL A 18,317 Shares 567,160.42 415,979.07
PINNACLE WEST CAPITAL COR 4,250 Shares 331,758.48 300,007.50
PREFERRED BANK LOS ANGELE 3,225 Shares 204,463.08 231,522.75
PROASSURANCE CORPORATION 15,411 Shares 305,583.98 389,898.30
QORVO INC 2,842 Shares 446,284.09 444,460.38
R1 RCM INC 26,097 Shares 440,908.39 665,212.53
RACKSPACE TECH INC 9,171 Shares 178,175.63 123,533.37
RANGE RESOURCES CORP 9,190 Shares 214,009.09 163,857.70
REALOGY HLDGS CORP 15,481 Shares 274,152.17 260,235.61
REINSURANCE GROUP OF AMER 2,542 Shares 311,255.97 278,323.58
RESIDEO TECH INC 8,060 Shares 219,894.80 209,801.80

4

Table of Contents

Ameren Corporation Savings Investment Plan

SCHEDULE H, Line 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)

December 31, 2021

Name of plan sponsor: Ameren Corporation

Employer identification number: 43-1723446

Three-digit plan number: 003

(a) — Identity of issue, borrower, (c) — Description of investment including maturity date, Current
lessor, or similar party rate of interest, collateral, par, or maturity
value Cost value
SLM CORP 54,288 Shares 591,766.32 1,067,844.96
SALLY BEAUTY HLDGS INC 21,284 Shares 298,879.38 392,902.64
SCHWEITZER-MAUDUIT INTL I 12,310 Shares 469,985.90 368,069.00
SCIENCE APPLICATIONS INTL 9,659 Shares 782,194.93 807,395.81
SKECHERS USA INC CL A 5,069 Shares 156,431.29 219,994.60
SOTERA HEALTH CO 25,138 Shares 611,627.88 591,999.90
SOUTHSTATE CORP 2,757 Shares 232,491.80 220,863.27
SPECTRUM BRANDS HLDGS INC 2,556 Shares 126,152.84 259,996.32
SPIRIT RLTY CAP INC 4,814 Shares 187,846.96 231,986.66
STANDARD MOTOR PRODUCTS I 2,783 Shares 131,702.93 145,801.37
STARWOOD PROPERTY TR INC 16,333 Shares 342,808.47 396,891.90
STEELCASE INC CLASS A 17,911 Shares 215,083.80 209,916.92
STRIDE INC 24,199 Shares 663,989.31 806,552.67
SYNOVUS FIN CORP. 9,780 Shares 376,252.35 468,168.60
TD SYNNEX CORP 6,256 Shares 337,698.63 715,436.16
SYNEOS HEALTH INC 9,772 Shares 517,579.23 1,003,388.96
TEGNA INC 36,585 Shares 680,872.88 679,017.60
TEMPUR SEALY INTL INC 8,732 Shares 126,786.67 410,665.96
TEREX CORP 4,005 Shares 78,891.35 176,019.75
TEXTRON INC 3,500 Shares 153,393.71 270,200.00
TOLL BROTHERS INC 3,701 Shares 141,638.19 267,915.39
TRAVEL+LEISURE CO 6,682 Shares 283,889.77 369,314.14
TTEC HLDGS INC 3,589 Shares 150,957.42 324,983.95
TURNING POINT BRANDS INC 5,709 Shares 257,038.26 215,686.02
ULTRA CLEAN HLDGS INC 9,975 Shares 213,187.75 572,166.00
UMPQUA HLDGS CORP 18,186 Shares 305,038.48 349,898.64
UNISYS CORP NEW 7,035 Shares 89,850.79 144,709.95
US FOODS HLDGS CORP 6,276 Shares 216,486.40 218,593.08
UNIVERSAL CORP 7,109 Shares 384,189.70 390,426.28
UNIVERSAL HEALTH SVCS INC 3,336 Shares 455,040.39 432,545.76
VALLEY NATL BANCORP 26,889 Shares 311,288.75 369,723.75
VALVOLINE INC 26,193 Shares 559,650.05 976,736.97
VIAD CORP 3,088 Shares 142,903.84 132,135.52
VIPER ENERGY PARTNERS LP 21,693 Shares 433,013.35 462,277.83
VISTRA CORP 11,092 Shares 240,301.68 252,564.84
WABASH NATIONAL CORP 13,532 Shares 216,866.18 264,144.64
WALKER & DUNLOP INC 5,570 Shares 340,402.65 840,401.60
WEBSTER FIN 6,156 Shares 350,955.01 343,751.04
WERNER ENTERPRISES INC 4,213 Shares 193,771.45 200,791.58
WESCO INTL INC 10,892 Shares 545,341.68 1,433,278.28
WESTERN UNION CO 13,442 Shares 268,564.82 239,805.28
WHITING PETROLEUM CORP NE 4,209 Shares 217,381.33 272,238.12
WINTR FIN CORP 2,428 Shares 186,894.05 220,510.96
WORLD FUEL SVCS CORP 12,741 Shares 311,503.08 337,254.27
YELP INC 9,743 Shares 308,991.49 353,086.32
FIRSTSVCS CORP 4,805 Shares 209,718.39 944,038.35
HORIZON THERAPEUTICS PLC 11,120 Shares 403,660.94 1,198,291.20
KORNIT DIGITAL LTD 4,034 Shares 683,385.56 614,176.50
ABIOMED INC 4,179 Shares 1,151,166.09 1,500,971.43
ACADIA HEALTHCARE CO INC 18,924 Shares 980,694.20 1,148,686.80
ALARM.COM HLDGS INC 13,160 Shares 890,399.87 1,116,099.60
AMEDISYS INC 4,270 Shares 561,481.06 691,227.60
ARES MANAGEMENT CORP CL A 15,221 Shares 541,183.89 1,237,010.67
AVALARA INC 8,383 Shares 722,563.97 1,082,329.13
AXON ENTERPRISE INC 9,290 Shares 846,954.36 1,458,530.00
BWX TECH INC 31,266 Shares 1,480,294.95 1,497,016.08
BIO TECHNE CORP 3,208 Shares 968,346.59 1,659,626.72
BLUEPRINT MEDICINES CORP 8,590 Shares 905,739.73 920,074.90
BRIGHT HORIZONS FAMILY SO 9,762 Shares 1,291,415.04 1,228,840.56
BRINKS CO 21,870 Shares 1,489,400.57 1,434,015.90
AZENTA INC 16,890 Shares 648,533.73 1,741,527.90
BUILDERS FIRSTSOURCE 33,098 Shares 1,271,562.71 2,836,829.58
BURLINGTON STORES INC 5,040 Shares 1,129,973.71 1,469,210.40
CABLE ONE INC 561 Shares 494,836.20 989,295.45
CELSIUS HLDGS INC 8,513 Shares 535,489.49 634,814.41

5

Table of Contents

Ameren Corporation Savings Investment Plan

SCHEDULE H, Line 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)

December 31, 2021

Name of plan sponsor: Ameren Corporation

Employer identification number: 43-1723446

Three-digit plan number: 003

(a) — Identity of issue, borrower, (c) — Description of investment including maturity date, Current
lessor, or similar party rate of interest, collateral, par, or maturity
value Cost value
CERTARA INC 22,177 Shares 576,956.56 630,270.34
CHARLES RIVER LABS INTL I 4,720 Shares 1,370,174.46 1,778,401.60
CHART INDU INC 3,439 Shares 598,848.12 548,486.11
CHEMED CORP 2,240 Shares 1,072,702.83 1,185,049.60
CAMECO CORP 58,756 Shares 475,935.98 1,281,468.36
RITCHIE BROS AUCTIONEERS 15,692 Shares 580,410.01 960,507.32
CROWN HLDGS INC 17,310 Shares 1,158,513.66 1,914,832.20
HELEN OF TROY LTD 2,610 Shares 528,736.32 638,066.70
DENBURY INC 15,306 Shares 951,574.65 1,172,286.54
DYNATRACE INC 28,811 Shares 1,624,741.22 1,738,743.85
ENTEGRIS INC 8,146 Shares 454,682.27 1,128,872.68
EURONET WORLDWIDE INC 12,867 Shares 1,449,599.41 1,533,360.39
FOX FACTORY HLDGS CORP 8,210 Shares 1,235,226.20 1,396,521.00
GUIDEWIRE SOFTWARE INC 9,169 Shares 1,048,774.40 1,040,956.57
HALOZYME THERAPEUTICS INC 25,017 Shares 470,528.24 1,005,933.57
HEALTHEQ INC 17,908 Shares 986,757.43 792,249.92
HEICO CORP CL A 5,116 Shares 238,040.73 657,508.32
INSMED INC 23,073 Shares 723,694.28 628,508.52
INSPIRE MEDICAL SYS INC 4,270 Shares 858,818.26 982,356.20
ISHARES RUSSELL MID-CAP G 3,130 Shares 356,974.05 360,638.60
iShares Russell 2000 Grow 6,090 Shares 1,776,657.28 1,784,674.50
LESLIE’S INC 57,672 Shares 1,397,155.50 1,364,519.52
LIGAND PHARMACEUTICALS 6,014 Shares 631,201.73 928,922.44
LINCOLN ELECTRIC HLDGS IN 4,993 Shares 354,054.38 696,373.71
LIVE NATION ENTERTAINMENT 7,440 Shares 342,735.47 890,493.60
MKS INSTRUMENTS INC 3,450 Shares 550,751.62 600,886.50
MARTIN MARIETTA MATERIALS 3,580 Shares 780,874.46 1,577,061.60
MERCURY SYS INC 16,227 Shares 1,261,206.71 893,458.62
MERIT MEDICAL SYS INC 13,010 Shares 658,718.89 810,523.00
NATIONAL INSTRUMENT CORP 23,710 Shares 984,072.76 1,035,415.70
NATIONAL VISION HLDGS INC 21,159 Shares 659,327.06 1,015,420.41
NEW FORTRESS ENERGY INC 20,417 Shares 931,356.80 492,866.38
NICE LTD SPON ADR 5,493 Shares 658,481.62 1,667,674.80
NOVANTA INC 5,120 Shares 367,716.74 902,809.60
OVERSTOCK.COM INC DEL 12,710 Shares 976,350.50 750,017.10
PACIFIC BIOSCIENES OF CAL 26,350 Shares 733,881.46 539,121.00
PEGASYS INC 6,260 Shares 831,478.33 699,993.20
PENUMBRA INC 5,785 Shares 1,106,532.16 1,662,146.20
PERFORMANCE FOOD GROUP CO 25,030 Shares 1,201,675.87 1,148,626.70
PURE STORAGE INC CL A 64,485 Shares 1,262,510.14 2,098,986.75
REVOLVE GROUP INC 18,023 Shares 1,158,112.45 1,010,008.92
SOLAREDGE TECH INC 4,570 Shares 1,397,787.96 1,282,204.90
STEM INC 22,965 Shares 441,777.06 435,646.05
10X GENOMICS INC 5,839 Shares 914,835.63 869,777.44
BEAUTY HEALTH CO/THE 24,830 Shares 694,584.21 599,892.80
TREX CO INC 16,284 Shares 648,240.80 2,198,828.52
TWIST BIOSCIENCE CORP 7,953 Shares 855,729.73 615,482.67
VARONIS SYS INC 17,430 Shares 480,484.02 850,235.40
VERACYTE INC 19,563 Shares 558,928.87 805,995.60
VIRTU FIN INC- CL A 48,847 Shares 1,108,420.62 1,408,259.01
WESTERN ALLIANCE BANCORP 11,500 Shares 785,011.68 1,237,975.00
WOLFSPEED INC 5,775 Shares 361,458.82 645,471.75
WORKIVA INC 7,380 Shares 754,450.03 963,016.20
WYNDHAM HOTELS & RESORTS 20,440 Shares 1,595,218.86 1,832,446.00
ZYNGA INC 144,030 Shares 987,058.87 921,792.00
BRP INC 10,780 Shares 1,032,899.14 945,513.80
SENSATA TECH HLDGS PLC 16,690 Shares 933,669.05 1,029,606.10
AXALTA COATING SYS LTD 18,260 Shares 546,521.80 604,771.20
ICON PLC 5,670 Shares 1,517,688.90 1,755,999.00
ADVANCED DRAINAGE SYS INC 9,850 Shares 1,078,476.50 1,340,880.50
AMERICAN FINL GROUP INC O 10,330 Shares 1,328,259.31 1,418,515.60
ARES MANAGEMENT CORP CL A 10,590 Shares 780,800.70 860,649.30
ASCENDIS PHARMA AS SPON A 8,960 Shares 1,376,553.90 1,205,388.80
ATKORE INC 14,470 Shares 1,336,738.60 1,608,919.30
AVALARA INC 6,700 Shares 1,158,071.87 865,037.00

6

Table of Contents

Ameren Corporation Savings Investment Plan

SCHEDULE H, Line 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)

December 31, 2021

Name of plan sponsor: Ameren Corporation

Employer identification number: 43-1723446

Three-digit plan number: 003

(a) (b) (c) (e)
Identity of issue, borrower, Description of investment including maturity date, Current
lessor, or similar party rate of interest, collateral, par, or maturity
value Cost value
AVANTOR INC 28,080 Shares 1,133,446.24 1,183,291.20
BILL.COM HLDGS INC 1,790 Shares 423,881.39 445,978.50
BIO RAD LABS CL A 1,725 Shares 1,292,490.75 1,303,358.25
BLUEPRINT MEDICINES CORP 10,780 Shares 1,112,992.09 1,154,645.80
BOOZ ALLEN HAMILTON HLDG 9,920 Shares 879,936.37 841,116.80
CATALENT INC 10,990 Shares 1,461,069.46 1,407,049.70
COGENT COMM HLDGS INC 10,690 Shares 763,693.60 782,294.20
DIAMONDBACK ENERGY INC 7,940 Shares 762,637.00 856,329.00
DOUGLAS EMMETT INC REIT 42,960 Shares 1,391,044.80 1,439,160.00
ELANCO ANIMAL HEALTH INC 27,160 Shares 894,619.54 770,800.80
ENCORE WIRE CORPORATION 4,400 Shares 624,137.78 629,640.00
ENPHASE ENERGY INC 1,430 Shares 280,291.50 261,604.20
FMC CORP NEW 7,010 Shares 653,612.40 770,328.90
F5 INC 4,740 Shares 959,613.00 1,159,925.40
FIVE BELOW INC 6,030 Shares 1,121,580.00 1,247,546.70
GARTNER INC 2,910 Shares 895,843.50 972,871.20
HAEMONETICS CORP MASS 8,190 Shares 581,851.51 434,397.60
HUBSPOT INC 2,005 Shares 1,365,886.20 1,321,595.75
IAA INC 13,340 Shares 735,567.60 675,270.80
IDEX CORPORATION 3,950 Shares 841,350.00 933,464.00
INDEPENDENCE REALTY TR IN 24,960 Shares 573,045.37 644,716.80
INSULET CORP 2,440 Shares 680,686.80 649,210.80
IRONWOOD PHARMA CL A (PEN 67,460 Shares 895,148.53 786,583.60
LPL FINL HLDGS INC 7,720 Shares 1,229,178.40 1,235,894.80
LINCOLN ELECTRIC HLDGS IN 4,640 Shares 613,129.60 647,140.80
LUMENTUM HLDGS INC 11,780 Shares 999,714.84 1,245,970.60
LYFT INC 16,200 Shares 863,784.00 692,226.00
MKS INSTRUMENTS INC 5,870 Shares 883,728.50 1,022,377.90
MAXLINEAR INC 8,050 Shares 554,236.78 606,889.50
MIRATI THERAPEUTICS INC 5,360 Shares 865,663.82 786,258.40
NATIONAL VISION HLDGS INC 22,940 Shares 1,329,831.80 1,100,890.60
NEUROCRINE BIOSCIENCES IN 12,810 Shares 1,212,128.07 1,091,027.70
NICE LTD SPON ADR 3,620 Shares 1,015,953.00 1,099,032.00
PAYA HLDGS INC 82,040 Shares 763,237.49 520,133.60
PAYLOCITY HLDGS CORP 3,980 Shares 1,103,677.51 939,916.80
PEGASYS INC 7,120 Shares 908,369.60 796,158.40
REVOLVE GROUP INC 8,120 Shares 507,107.67 455,044.80
ROCKET PHARMACEUTICALS IN 13,440 Shares 402,349.96 293,395.20
SAIA INC 3,280 Shares 782,083.20 1,105,458.40
SIGNATURE BANK 3,310 Shares 912,401.50 1,070,685.70
SILICON MOTION TECH CORP 10,240 Shares 714,035.20 973,107.20
TAPESTRY INC 25,960 Shares 1,005,950.00 1,053,976.00
TELEDYNE TECH INC 1,710 Shares 739,609.20 747,081.90
TOPBUILD CORP 3,780 Shares 800,188.20 1,042,939.80
TRANSUNION 9,700 Shares 1,101,047.00 1,150,226.00
TREX CO INC 9,650 Shares 1,011,706.00 1,303,039.50
VAIL RESORTS INC 2,970 Shares 1,016,428.54 973,863.00
VULCAN MATERIALS CO 5,570 Shares 967,843.20 1,156,220.60
WILLSCOT MOBILE MINI HLDG 18,000 Shares 712,837.18 735,120.00
ZYNGA INC 126,340 Shares 897,220.05 808,576.00
Total Common Stocks 513,698,063.71 817,705,892.82
Notes Receivable
* / ** Participants Participant Loans 32,191,309.05 32,191,309.05
$ 2,493,096,299.22 $ 3,311,468,043.65
  • Investment represents allowable transaction with a party-in-interest.

** Interest rates vary from 4.00% to 10.50% on loans maturing through January 2032.

7

Table of Contents

SIGNATURE

The Plan. Pursuant to the requirements of the Securities Exchange Act of 1934, the trustee (or other persons who administer the employee benefit plan) has duly caused this annual report to be signed on its behalf by the undersigned hereunto duly authorized.

AMEREN CORPORATION
SAVINGS INVESTMENT PLAN
AMEREN ADMINISTRATIVE COMMITTEE
(Administrator)
By: /s/ Marla J. Langenhorst
Marla J. Langenhorst
Member of the Administrative Committee

October 27, 2023

Table of Contents

EXHIBIT INDEX

Exhibit No. Description
23.1 Consent of Independent Registered Public Accounting Firm

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