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AMEREN CORP

Regulatory Filings Jun 25, 2024

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11-K 1 d856204d11k.htm 11-K 11-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISISION

WASHINGTON, DC 20549

FORM 11-K

ANNUAL REPORT PURSUANT TO SECTION 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2023

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 the securities held pursuant to the plan and the address of its principal executive office:

Ameren Corporation

1901 Chouteau Avenue

St. Louis, Missouri 63103

Ameren Corporation

Savings Investment Plan

Index

Report of Independent Registered Public Accounting Firm
December 31, 2023 and 2022 1-2
Financial Statements
Statements of Net Assets Available for Benefits as of December
31, 2023 and 2022 3
Statements of Changes in Net Assets Available for Benefits for the Years Ended
December 31, 2023 and 2022 4
Notes to Financial Statements 5-15
Supplemental Schedules*
Schedule G, Part III - Schedule of Nonexempt Transactions For the Year Ended December 31,
2023 16
Schedule H, Line 4a - Schedule of Delinquent Participant Contributions For the
Year Ended December 31, 2023 17
Schedule H, Line 4i - Schedule of Assets (Held at End of Year) as of December 31,
2023 18-26
  • 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.
Signature 27
Index to Exhibit 28

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, 2023 and 2022, 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, 2023 and 2022, 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.

1

Supplemental Information

The supplemental Schedule H, Line 4a – Schedule of Delinquent Participant Contributions for the year ended December 31, 2023, Schedule H, Line 4i – Schedule of Assets (Held at End of Year) as of December 31, 2023, and Schedule G, Part III – Schedule of Nonexempt Transactions for the year ended December 31, 2023 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 25, 2024

2

Ameren Corporation

Savings Investment Plan

Statements of Net Assets Available for Benefits

December 31, 2023 and 2022

2023 2022
Assets
Investments, at fair value $ 2,660,380,131 $ 2,379,255,100
Investments, at contract value 279,508,796 328,518,911
Total investments 2,939,888,927 2,707,774,011
Cash — 1,983,082
Receivables
Notes receivable from participants 36,881,734 35,305,902
Participant contributions 2,720,436 1,860,109
Employer contributions 3,784,417 2,314,955
Dividends and interest 523,195 368,031
Due from brokers for securities sold 8,276,643 8,464,916
Total receivables 52,186,425 48,313,913
Total assets 2,992,075,352 2,758,071,006
Liabilities
Accrued expenses 587,828 728,617
Due to brokers for securities purchased 6,884,077 2,246,149
Total liabilities 7,471,905 2,974,766
Net assets available for benefits $ 2,984,603,447 $ 2,755,096,240

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

3

Ameren Corporation

Savings Investment Plan

Statements of Changes in Net Assets Available for Benefits

Years Ended December 31, 2023 and 2022

2023 2022
Additions:
Investment Income
Interest and dividends $ 30,560,809 $ 24,044,247
Net appreciation in fair value of investments 319,654,369 —
Total income 350,215,178 24,044,247
Interest on notes receivable from participants 1,891,143 1,456,509
Participant contributions 135,285,765 115,827,089
Employer contributions 55,018,432 42,404,368
Total additions 542,410,518 183,732,213
Deductions:
Net depreciation in fair value of investments — 478,127,514
Benefits paid to participants 309,385,348 258,158,886
Administrative expenses 3,517,963 3,698,098
Total deductions 312,903,311 739,984,498
Net increase / (decrease) 229,507,207 (556,252,285 )
Net assets available for benefits
Beginning of year 2,755,096,240 3,311,348,525
End of year $ 2,984,603,447 $ 2,755,096,240

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

4

Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2023 and 2022

  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 of service, 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 contributions 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 match.

5

Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2023 and 2022

The Plan permits annual “catch-up” contributions for all employees age 50 and older. For eligible employees, the additional “catch-up” contributions were limited to $7,500 and $6,500 in 2023 and 2022, respectively. The Company does not match “catch-up” contributions.

The Plan permits the Company to make an Additional Company Contribution for contract employees in compliance with a collective bargaining agreement with the specific union representing the Participants. Additional Company Contributions will always be 100% vested and nonforfeitable, and will otherwise be subject to the same distribution, loan and withdrawal restrictions as apply to Employer Basic Matching 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 the Ameren Stock Fund. The Employer Additional Matching Contributions are invested in the Ameren Stock Fund. Participant contributions and Employer Basic Matching Contributions may be allocated to a single investment option or allocated in increments of one percent to any combination of investment options. Employer Additional Matching Contributions invested in the Ameren Stock Fund, may be immediately reallocated to any of the other investment options available under the Plan at the participants’ discretion. Investment elections may be changed daily.

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 matching contributions and (b) Plan earnings. Each Participant’s account is charged with benefits paid, and an allocation of (a) Plan losses and (b) 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. Allocations (other than the Employee Additional Matching Contributions) to the Ameren Stock Fund are limited to 20 percent for both contributions and existing balances. No more than 20 percent of contributions other than the Employee Additional Matching Contributions may be directed to the Ameren Stock Fund or, if rebalancing, the Ameren Stock Fund balance cannot exceed 20 percent of a participant’s total account balance. If a participant’s investments in the Ameren Stock Fund remains above 20 percent of his or her total account balance since September 1, 2019 (effective date of the restriction), then additional exchanges into the Ameren Stock Fund will not be permitted.

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. As of December 31, 2023 and 2022, the interest rates on participant loans ranged from 4.00 percent to 10.50 percent.

6

Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2023 and 2022

Vesting

The amounts in Participants’ accounts, including Company contributions, are always fully vested.

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.

Effective for Participants who reach age 72 in 2022, the Plan began making required minimum distributions (“RMD”) no later than April 1, 2023. On December 29, 2022, The Consolidated Appropriations Act of 2023 was enacted into law. The Act includes the retirement provisions referred to as SECURE 2.0. Beginning in 2023, the SECURE 2.0 Act raised the age that a participant must begin taking RMDs to age 73. Effective for Participants who reached age 72 in 2023 the Plan will begin making RMDs no later than April 1, 2025.

Participants may withdraw certain 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.

7

Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2023 and 2022

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, 2023 and 2022. 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.

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 less 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 10% and 13% of investments at December 31, 2023 and 2022, respectively.

8

Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2023 and 2022

  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 2023 or 2022.

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 2023.

• 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).

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

9

Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2023 and 2022

• 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 $4,483,972 at December 31, 2023 and $7,548,328 at December 31, 2022) 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, 2023:

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 $ 288,332,049 $ — $ — $ 288,332,049
Common stocks-other than Plan sponsor stock 344,927,850 — — 344,927,850
American depositary receipts (ADRs) 9,241,304 — — 9,241,304
Preferred stocks 191,406 — — 191,406
Collective trust funds — — 1,820,750,969 1,820,750,969
Mutual funds 196,936,553 — — 196,936,553
Total assets reported at fair value $ 839,629,162 $ — $ 1,820,750,969 $ 2,660,380,131

(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.

10

Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2023 and 2022

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, 2022:

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 $ 357,922,651 $ — $ — $ 357,922,651
Common stocks-other than Plan sponsor stock 301,111,632 — — 301,111,632
American depositary receipts (ADRs) 4,997,766 — — 4,997,766
Collective trust funds — — 1,568,775,479 1,568,775,479
Mutual funds 146,447,572 — — 146,447,572
Total assets reported at fair value $ 810,479,621 $ — $ 1,568,775,479 $ 2,379,255,100

(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 Short-Term Investment Fund II (SEI Trust Company sponsored CIT), and (2) a portfolio of investment contracts, valued at $279,508,796 and $328,518,911 at December 31, 2023 and 2022, 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 less 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 Life Insurance Company (“Transamerica”)

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

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

• Metropolitan Tower Life Insurance Company (“Met Life”)

11

Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2023 and 2022

As of December 31, 2023 and 2022, 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.

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.

12

Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2023 and 2022

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.

  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, 2023, the Plan held 3,985,790 shares of Company common stock with a cost and fair value of $202,713,109 and $288,332,049, respectively. During 2023, the Plan purchased 175,814 shares at a cost of $13,887,962 and sold 215,245 shares valued at $17,904,146.

At December 31, 2022, the Plan held 4,025,221 shares of Company common stock with a cost and fair value of $199,623,879 and $357,922,651, respectively. During 2022, the Plan purchased 151,755 shares at a cost of $13,361,691 and sold 184,390 shares valued at $16,408,589.

For the year ended December 31, 2023, dividend income and realized gains from the sale of Company common stock was $10,013,775 and $7,105,414, respectively. For the year ended December 31, 2022, dividend income and realized gains from the sale of Company common stock was $9,454,690 and $7,440,583, respectively.

At December 31, 2023 and December 31, 2022, 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 $1,449,642 and $1,412,327 for the years ended December 31, 2023 and December 31, 2022, 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.

13

Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2023 and 2022

  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, 2023 and 2022:

Net assets available for benefits per the financial statements 2023 — $ 2,984,603,447 $ 2,755,096,240
Amounts allocated to deemed distributions of notes receivable from Participants (2,257,271 ) (2,109,543 )
Adjustment from contract value to fair value for fully benefit-responsive investment
contracts (18,337,058 ) (24,976,221 )
Net assets available for benefits per the Form 5500 $ 2,964,009,118 $ 2,728,010,476

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, 2023:

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 (18,337,058 )
Adjustment from contract value to fair value for fully benefit-responsive investment contracts as
of the prior year-end 24,976,221
Net decrease in defaulted notes receivable from Participants 5,562
Interest income of defaulted notes receivable from Participants (153,290 )
Total net income per the Form 5500 $ 235,998,642

14

Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2023 and 2022

  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, 2023 and 2022, 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 2020.

  1. Subsequent Events

There were no subsequent events identified through June 25, 2024, the date the financial statements were issued.

15

Ameren Corporation Savings Investment Plan

SCHEDULE G, PART III - Schedule of Nonexempt Transactions

Year Ended December 31, 2023

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 2023 plan year was $216,950 - VFCP filed $ 216,950 $ 15,175

16

Ameren Corporation Savings Investment Plan

SCHEDULE H, Line 4a - SCHEDULE OF DELINQUENT PARTICIPANT CONTRIBUTIONS

Year Ended December 31, 2023

Name of plan sponsor: Ameren Corporation

Employer identification number: 43-1723446

Three-digit plan number: 003

| Participant Contributions Transferred Late to Plan — Check here if Late Participant Loan Repayments
are included: ☐ | Total that Constitute Nonexempt Prohibited Transaction — Contributions Not Corrected | Contributions Corrected Outside VFCP | Contributions Pending Correction in VFCP | Total Fully Corrected Under Voluntary Fiduciary Correction Program (VFCP) and Prohibited
Transaction Exemption (PTE) 2002-51 |
| --- | --- | --- | --- | --- |
| $ 2,710 | $— | $— | $2,710 | $— |

17

Ameren Corporation Savings Investment Plan

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

December 31, 2023

Name of plan sponsor: Ameren Corporation
Employer identification number: 43-1723446
Three-digit plan number: 003
(a) (b) (c) (d) (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 $ 4,483,972.32
Total Interest-bearing Cash 4,483,972.32
Mutual Funds
American Funds Group EuroPacific Growth Fund 119,522,671.99
* Sands Capital Management Touchstone Sands Capital Institutional Growth Fund 52,272,928.33
* Pacific Investment Management Company PIMCO Income Institutional Fund 22,813,357.49
* Fidelity Management Trust Company Fidelity Institutional Money Market Government Portfolio 2,327,595.24
Total Mutual Funds 196,936,553.05
Collective Investment Trusts
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index Retirement Fund W 63,232,455.54
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2025 Fund W 87,367,293.82
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2030 Fund W 130,092,298.26
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2035 Fund W 95,764,730.46
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2040 Fund W 101,811,765.54
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2045 Fund W 109,645,917.85
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2050 Fund W 107,145,763.78
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2055 Fund W 76,540,597.63
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2060 Fund W 32,920,910.24
* BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2065 Fund W 8,751,379.61
* BlackRock Institutional Trust Company, N.A. BlackRock Equity Index Fund F 431,251,813.07
* BlackRock Institutional Trust Company, N.A. BlackRock Russell 2500 Index Fund F 174,713,269.70
* BlackRock Institutional Trust Company, N.A. BlackRock MSCI ACWI ex-US IMI Index Fund F 77,440,086.78
* BlackRock Institutional Trust Company, N.A. BlackRock US Debt Index Fund F 55,710,804.50
* BlackRock Institutional Trust Company, N.A. BlackRock TIPS Bond Index Fund M 22,301,676.18
* SEI Trust Company Galliard Short Core Fund F 110,512,293.00
* SEI Trust Company Galliard Intermediate Core Fund L 150,659,445.00
* SEI Trust Company Short-Term Investment Fund II 12,699,794.00
* Robeco Trust Company Boston Partners Large Cap Value Equity Fund E 104,963,293.23
* Hand Benefits and Trust Company Snyder Capital Small/Mid Cap Value Fund R1 55,678,381.03
* Wellington Management Company LLP Wellington CIF II Core Plus Bond Portfolio 68,234,764.94
Total Collective Investment Trusts 2,077,438,734.16
Common Stocks
* AMEREN CORPORATION 3,985,790 Shares 288,332,048.60
ADOBE INC 4,211.0000 Shares 2,512,282.60
ADVANCED MICRO DEVICES IN 26,776.0000 Shares 3,947,050.16
AIRBNB INC CLASS A 7,191.0000 Shares 978,982.74
ALPHABET INC CL C 23,075.0000 Shares 3,251,959.75
ALPHABET INC CL A 23,281.0000 Shares 3,252,122.89
AMAZON.COM INC 52,244.0000 Shares 7,937,953.36
AMERICAN TOWER CORP 5,825.0000 Shares 1,257,501.00
APPLE INC 26,211.0000 Shares 5,046,403.83
ARM HLDGS LTD 6,635.0000 Shares 498,587.08
ASTRAZENECA PLC SPONS ADR 17,690.0000 Shares 1,191,421.50
BOEING CO 4,018.0000 Shares 1,047,331.88
BROADCOM INC 977.0000 Shares 1,090,576.25
CADENCE DESIGN SYS INC 4,495.0000 Shares 1,224,303.15
CHIPOTLE MEXICAN GRILL IN 314.0000 Shares 718,105.44
COSTCO WHOLESALE CORP 2,951.0000 Shares 1,947,896.08
CROWDSTRIKE HLDGS INC 5,569.0000 Shares 1,421,877.08
META PLATFORMS INC CL A 10,247.0000 Shares 3,627,028.12
GOLDMAN SACHS GROUP INC 1,868.0000 Shares 720,618.36

(d) cost: Investment is participant directed, therefore historical cost is not required. 18

Ameren Corporation Savings Investment Plan

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

December 31, 2023

Name of plan sponsor: Ameren Corporation
Employer identification number: 43-1723446
Three-digit plan number: 003
(a) (b) (c) (d) (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
L’OREAL SA ORD 2,193.0000 Shares 1,091,006.68
HOME DEPOT INC 5,413.0000 Shares 1,875,875.15
HUBSPOT INC 956.0000 Shares 554,996.24
INTUITIVE SURGICAL INC 5,385.0000 Shares 1,816,683.60
KEYSIGHT TECH INC 3,296.0000 Shares 524,360.64
LVMH MOET HENNESSY ADR 4,981.0000 Shares 809,163.45
ELI LILLY & CO 6,520.0000 Shares 3,800,638.40
LULULEMON ATHLETICA INC 3,766.0000 Shares 1,925,518.14
MARRIOTT INTL INC A 4,754.0000 Shares 1,072,074.54
MASTERCARD INC CL A 6,718.0000 Shares 2,865,294.18
MERCADOLIBRE INC 871.0000 Shares 1,368,811.34
MICROSOFT CORP 19,151.0000 Shares 7,201,542.04
MONGODB INC CL A 2,803.0000 Shares 1,146,006.55
MOODYS CORP 2,811.0000 Shares 1,097,864.16
NETFLIX INC 4,817.0000 Shares 2,345,300.96
NIKE INC CL B 11,982.0000 Shares 1,300,885.74
NOVO-NORDISK AS CL B ADR 20,531.0000 Shares 2,123,931.95
NVIDIA CORP 12,661.0000 Shares 6,269,980.42
O’REILLY AUTOMOTIVE INC 954.0000 Shares 906,376.32
PALO ALTO NETWORKS INC 1,027.0000 Shares 302,841.76
SALESFORCE INC 9,615.0000 Shares 2,530,091.10
SVCSNOW INC 2,707.0000 Shares 1,912,468.43
SNOWFLAKE INC CL A 7,113.0000 Shares 1,415,487.00
TJX COMPANIES INC NEW 12,645.0000 Shares 1,186,227.45
TESLA INC 14,554.0000 Shares 3,616,377.92
TRADE DESK INC 13,547.0000 Shares 974,842.12
UBER TECH INC 33,794.0000 Shares 2,080,696.58
UNITEDHEALTH GROUP INC 3,324.0000 Shares 1,749,986.28
VERTEX PHARMACEUTICALS IN 3,543.0000 Shares 1,441,611.27
VISA INC CL A 11,750.0000 Shares 3,059,112.50
ASML HLDG NV (NY REG SHS) 1,273.0000 Shares 963,559.16
AFFILIATED MANAGERS GRP I 10,082.0000 Shares 1,526,616.44
AIR LEASE CORP CL A 27,323.0000 Shares 1,145,926.62
BREAD FIN HLDGS 13,214.0000 Shares 435,269.16
AMERIPRISE FIN INC 12,468.0000 Shares 4,735,720.44
ARROW ELECTRONICS INC 17,405.0000 Shares 2,127,761.25
ASSURANT INC 12,343.0000 Shares 2,079,672.07
BERRY GLOBAL GROUP INC 33,120.0000 Shares 2,231,956.80
BROADCOM INC 4,292.0000 Shares 4,790,945.00
CIGNA GROUP (THE) 11,966.0000 Shares 3,583,218.70
CELANESE CORP 20,074.0000 Shares 3,118,897.38
CENTENE CORP 42,162.0000 Shares 3,128,842.02
CONCENTRIX CORP 10,736.0000 Shares 1,054,382.56
FLEX LTD 105,589.0000 Shares 3,216,240.94
EBAY INC 56,466.0000 Shares 2,463,046.92
EXPEDIA INC 25,214.0000 Shares 3,827,233.06
F5 INC 12,850.0000 Shares 2,299,893.00
FIDELITY NATL INFORM SVCS 71,554.0000 Shares 4,298,248.78
GLOBAL PAYMENTS INC 28,122.0000 Shares 3,571,494.00
HCA HEALTHCARE INC 10,120.0000 Shares 2,739,281.60
LEAR CORP NEW 12,118.0000 Shares 1,711,182.78
LITHIA MOTORS INC CL A 5,391.0000 Shares 1,775,148.48
NRG ENERGY INC 49,627.0000 Shares 2,565,715.90
GEN DIGITAL INC 115,681.0000 Shares 2,639,840.42
PRIMERICA INC 7,694.0000 Shares 1,583,117.44
TD SYNNEX CORP 11,947.0000 Shares 1,285,616.67

(d) cost: Investment is participant directed, therefore historical cost is not required. 19

Ameren Corporation Savings Investment Plan

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

December 31, 2023

Name of plan sponsor: Ameren Corporation
Employer identification number: 43-1723446
Three-digit plan number: 003
(a) (b) (c) (d) (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
UBER TECH INC 86,432.0000 Shares 5,321,618.24
UNITED RENTALS INC 10,142.0000 Shares 5,815,625.64
WESCO INTL INC 10,724.0000 Shares 1,864,689.12
WHIRLPOOL CORP 13,166.0000 Shares 1,603,223.82
AERCAP HLDGS NV 35,357.0000 Shares 2,627,732.24
SUNCOR ENERGY INC 102,983.0000 Shares 3,299,575.32
ADIENT PLC 21,884.0000 Shares 795,702.24
LIBERTY GLOBAL LTD C 95,317.0000 Shares 1,776,708.88
AGCO CORP 2,657.0000 Shares 322,586.37
AES CORP 8,813.0000 Shares 169,650.25
AMN HEALTHCARE SVCS INC 3,846.0000 Shares 287,988.48
ACUITY BRANDS INC 2,064.0000 Shares 422,769.12
ALIGHT INC CL A 35,024.0000 Shares 298,754.72
ALLISON TRANSMISSION HLDG 7,021.0000 Shares 408,271.15
AMEDISYS INC 1,718.0000 Shares 163,313.08
AMERIS BANCORP 4,286.0000 Shares 227,372.30
AMKOR TECH INC 7,878.0000 Shares 262,101.06
APPLOVIN CORP 6,292.0000 Shares 250,736.20
ARRAY TECH INC 13,202.0000 Shares 221,793.60
ARROW ELECTRONICS INC 2,089.0000 Shares 255,380.25
ASHLAND INC 3,465.0000 Shares 292,134.15
ASSURANT INC 1,370.0000 Shares 230,831.30
ATKORE INC 2,440.0000 Shares 390,400.00
AVANTOR INC 12,881.0000 Shares 294,073.23
AVNET INC 5,709.0000 Shares 287,733.60
BEACON ROOFING SUPPLY INC 6,972.0000 Shares 606,703.44
BELDEN INC 1,986.0000 Shares 153,418.50
BELLRING BRANDS INC 6,299.0000 Shares 349,153.57
BERKLEY (WR) CORP 2,375.0000 Shares 167,960.00
BERKSHIRE HILLS BANCORP I 4,368.0000 Shares 108,457.44
BGC GROUP INC A 42,938.0000 Shares 310,012.36
BLOOMIN BRANDS INC 8,118.0000 Shares 228,521.70
BLUE OWL CAPITAL INC A 12,534.0000 Shares 186,756.60
BOWLERO CORP A 32,943.0000 Shares 466,472.88
BOYD GAMING CORP 6,668.0000 Shares 417,483.48
BRADY CORPORATION CL A 4,589.0000 Shares 269,328.41
BRINKER INTL INC 4,699.0000 Shares 202,902.82
BRINKS CO 9,438.0000 Shares 830,072.10
BUCKLE INC (THE) 4,400.0000 Shares 209,088.00
BUILDERS FIRSTSOURCE 1,521.0000 Shares 253,915.74
CBOE GLOBAL MARKETS INC 2,144.0000 Shares 382,832.64
CACTUS INC CL A 3,633.0000 Shares 164,938.20
CALERES INC 6,021.0000 Shares 185,025.33
TOPGOLF CALLAWAY BRANDS C 14,076.0000 Shares 201,849.84
CARLISLE COS INC 767.0000 Shares 239,633.81
CARS.COM INC 11,040.0000 Shares 209,428.80
CATALYST PHARMACEUTICALS 13,153.0000 Shares 221,101.93
CHAMPIONX CORP 6,379.0000 Shares 186,330.59
CHEMED CORP 273.0000 Shares 159,636.75
CIENA CORP 6,009.0000 Shares 270,465.09
CLEARFIELD INC 8,081.0000 Shares 234,995.48
COHERENT CORP 4,989.0000 Shares 217,171.17
CONCENTRIX CORP 3,927.0000 Shares 385,670.67
CHECK POINT SOFTWARE TECH 3,591.0000 Shares 548,668.89
CORECIVIC INC 23,981.0000 Shares 348,443.93
QUIDELORTHO CORP 2,116.0000 Shares 155,949.20

(d) cost: Investment is participant directed, therefore historical cost is not required. 20

Ameren Corporation Savings Investment Plan

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

December 31, 2023

Name of plan sponsor: Ameren Corporation
Employer identification number: 43-1723446
Three-digit plan number: 003
(a) (b) (c) (d) (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
COUSINS PROPERTIES INC 6,224.0000 Shares 151,554.40
CURTISS WRIGHT CORPORATIO 2,260.0000 Shares 503,505.40
WHITE MOUNTAINS INS GROUP 160.0000 Shares 240,801.60
FLEX LTD 18,294.0000 Shares 557,235.24
DAVE & BUSTERS ENTMT INC 4,707.0000 Shares 253,471.95
DIME COMMUNITY BANCSHARES 5,650.0000 Shares 152,154.50
EVEREST GROUP LTD 1,102.0000 Shares 389,645.16
METHANEX CORP 3,584.0000 Shares 169,738.24
DROPBOX INC CL A 9,651.0000 Shares 284,511.48
DUN & BRADSTREET HLDGS IN 19,295.0000 Shares 225,751.50
AXIS CAPITAL HLDGS LTD 5,938.0000 Shares 328,787.06
RENAISSANCERE HLDGS LTD 1,625.0000 Shares 318,500.00
EAST WEST BANCORP INC 7,831.0000 Shares 563,440.45
ECOVYST INC 27,763.0000 Shares 271,244.51
EMCOR GROUP INC 2,104.0000 Shares 453,264.72
ENACT HLDGS INC 6,156.0000 Shares 177,846.84
ENERSYS INC 3,648.0000 Shares 368,302.08
ESSEX PROPERTY TR INC 847.0000 Shares 210,005.18
EVERCORE INC A 2,704.0000 Shares 462,519.20
EXPEDIA INC 1,533.0000 Shares 232,694.07
EXTREME NETWORKS INC 13,791.0000 Shares 243,273.24
FMC CORP NEW 3,061.0000 Shares 192,996.05
FTI CONSULTING INC 2,767.0000 Shares 551,048.05
FEDERAL AGRI MTG NON VTG 2,967.0000 Shares 567,349.74
FIRST ADVANTAGE CORP 17,633.0000 Shares 292,178.81
FIRST CITIZENS BANCSHARES 107.0000 Shares 151,829.79
FIRST MERCHANTS CORP 5,930.0000 Shares 219,884.40
FIRSTCASH HLDGS INC 4,689.0000 Shares 508,240.71
FORTREA HLDGS INC 9,155.0000 Shares 319,509.50
FRONTDOOR INC 9,514.0000 Shares 335,083.08
GRANITE CONSTRUCTION INC 6,632.0000 Shares 337,303.52
GRAPHIC PACKAGING HLDGS C 14,396.0000 Shares 354,861.40
HF SINCLAIR CORP 3,952.0000 Shares 219,612.64
HAEMONETICS CORP MASS 6,273.0000 Shares 536,404.23
HALOZYME THERAPEUTICS INC 4,704.0000 Shares 173,859.84
HANCOCK WHITNEY CORP 5,775.0000 Shares 280,607.25
HERITAGE COMMERCE CORP 19,616.0000 Shares 194,590.72
HUB GROUP INC CL A 2,451.0000 Shares 225,344.94
HUNTINGTON BANCSHARES INC 24,387.0000 Shares 310,202.64
INGREDION INC 2,617.0000 Shares 284,023.01
INSIGHT ENTERPRISES INC 1,155.0000 Shares 204,654.45
INTERDIGITAL INC 3,968.0000 Shares 430,686.72
INTERPUBLIC GROUP OF COS 9,618.0000 Shares 313,931.52
JABIL INC 2,124.0000 Shares 270,597.60
JACOBS SOLUTIONS INC 2,462.0000 Shares 319,567.60
JEFFERIES FIN GROUP INC 5,754.0000 Shares 232,519.14
JUNIPER NETWORKS INC 6,703.0000 Shares 197,604.44
KOSMOS ENERGY LTD 31,266.0000 Shares 209,794.86
LKQ CORP 2,564.0000 Shares 122,533.56
LCI INDU 2,348.0000 Shares 295,167.08
LPL FINL HLDGS INC 1,375.0000 Shares 312,977.50
LAMAR ADVERTISING CO CL A 2,507.0000 Shares 266,443.96
LAMB WESTON HLDGS INC 2,485.0000 Shares 268,603.65
LANDSTAR SYS INC 629.0000 Shares 121,805.85
LANTHEUS HLDGS INC 5,097.0000 Shares 316,014.00
LAUREATE EDUCATION INC 42,922.0000 Shares 588,460.62

(d) cost: Investment is participant directed, therefore historical cost is not required. 21

Ameren Corporation Savings Investment Plan

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

December 31, 2023

Name of plan sponsor: Ameren Corporation
Employer identification number: 43-1723446
Three-digit plan number: 003
(a) (b) (c) (d) (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
LEGALZOOM.COM INC 31,821.0000 Shares 359,577.30
LEONARDO DRS INC 17,673.0000 Shares 354,166.92
LITHIA MOTORS INC CL A 2,160.0000 Shares 711,244.80
LIVE NATION ENTERTAINMENT 1,875.0000 Shares 175,500.00
MGM RESORTS INTL 5,000.0000 Shares 223,400.00
STEVEN MADDEN LTD 12,119.0000 Shares 508,998.00
MASONITE WORLDWIDE HLDGS 3,104.0000 Shares 262,784.64
MATCH GROUP INC 5,252.0000 Shares 191,698.00
PEDIATRIX MEDICAL GROUP I 12,433.0000 Shares 115,626.90
MIDDLEBY CORP 1,353.0000 Shares 199,121.01
MOLINA HEALTHCARE INC 778.0000 Shares 281,099.18
MOLSON COORS BEVERAGE CO 2,828.0000 Shares 173,101.88
NCR VOYIX CORP 8,575.0000 Shares 145,003.25
NCR ATLEOS CORP 4,288.0000 Shares 104,155.52
NETAPP INC 3,522.0000 Shares 310,499.52
NEW JERSEY RESOURCES CORP 2,485.0000 Shares 110,781.30
NEXSTAR MEDIA GROUP INC 3,084.0000 Shares 483,417.00
NISOURCE INC 8,390.0000 Shares 222,754.50
GEN DIGITAL INC 19,393.0000 Shares 442,548.26
NOW INC 12,788.0000 Shares 144,760.16
OLD NATIONAL BANCORP (IND 20,498.0000 Shares 346,211.22
PAR PACIFIC HLDGS INC 10,257.0000 Shares 373,047.09
PATTERSON-UTI ENERGY INC 10,349.0000 Shares 111,769.20
PEAPACK GLADSTONE FINL CO 4,551.0000 Shares 135,710.82
PEGASYS INC 2,908.0000 Shares 142,084.88
PENNYMAC FIN SVCS INC 3,311.0000 Shares 292,593.07
PERFORMANCE FOOD GROUP CO 3,321.0000 Shares 229,647.15
PINNACLE WEST CAPITAL COR 2,705.0000 Shares 194,327.20
PORTLAND GEN ELECTRIC CO 2,641.0000 Shares 114,460.94
PREFERRED BANK LOS ANGELE 3,494.0000 Shares 255,236.70
PROPETRO HLDGS CORP 17,617.0000 Shares 147,630.46
QORVO INC 2,540.0000 Shares 286,029.40
RALPH LAUREN CORP 1,681.0000 Shares 242,400.20
RANGE RESOURCES CORP 6,283.0000 Shares 191,254.52
SLM CORP 53,539.0000 Shares 1,023,665.68
SS&C TECH HLDGS INC 3,008.0000 Shares 183,818.88
HENRY SCHEIN INC 3,042.0000 Shares 230,309.82
SCIENCE APPLICATIONS INTL 4,023.0000 Shares 500,139.36
SELECT WATER SOLUTIONS IN 18,418.0000 Shares 139,792.62
SIMPLY GOOD FOODS CO 5,284.0000 Shares 209,246.40
SKYWORKS SOLUTIONS INC 1,209.0000 Shares 135,915.78
SOUTHSTATE CORP 4,912.0000 Shares 414,818.40
STRIDE INC 2,753.0000 Shares 163,445.61
TD SYNNEX CORP 5,678.0000 Shares 611,009.58
TEGNA INC 31,916.0000 Shares 488,314.80
TEMPUR SEALY INTL INC 9,135.0000 Shares 465,610.95
TEXTRON INC 5,192.0000 Shares 417,540.64
THOR INDU INC 1,670.0000 Shares 197,477.50
TIDEWATER INC 2,944.0000 Shares 212,291.84
TRINET GROUP INC 1,869.0000 Shares 222,280.17
US SILICA HLDGS INC 11,943.0000 Shares 135,075.33
US FOODS HLDGS CORP 9,056.0000 Shares 411,232.96
UNIVERSAL HEALTH SVCS INC 1,526.0000 Shares 232,623.44
VALMONT INDU INC 1,118.0000 Shares 261,064.18
VECTOR GROUP LTD 14,988.0000 Shares 169,064.64
VIPER ENERGY INC 13,567.0000 Shares 425,732.46

(d) cost: Investment is participant directed, therefore historical cost is not required. 22

Ameren Corporation Savings Investment Plan

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

December 31, 2023

Name of plan sponsor: Ameren Corporation
Employer identification number: 43-1723446
Three-digit plan number: 003
(a) (b) (c) (d) (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
VIVID SEATS INC-CL A 27,311.0000 Shares 172,605.52
VOYA FIN INC 5,994.0000 Shares 437,322.24
WALKER & DUNLOP INC 2,190.0000 Shares 243,111.90
WEBSTER FIN 3,894.0000 Shares 197,659.44
WESCO INTL INC 4,839.0000 Shares 841,405.32
WESTERN ALLIANCE BANCORP 9,500.0000 Shares 625,005.00
WEX INC 1,038.0000 Shares 201,942.90
WINTR FIN CORP 5,015.0000 Shares 465,141.25
WORLD KINECT CORP 7,981.0000 Shares 181,807.18
ASSURED GUARANTY LTD 5,659.0000 Shares 423,462.97
ENERPLUS CORP 11,360.0000 Shares 174,262.40
ICON PLC 3,027.0000 Shares 856,852.89
EXPRO GROUP HLDGS NV 15,481.0000 Shares 246,457.52
SENSATA TECH HLDGS PLC 6,007.0000 Shares 225,682.99
ESSENT GROUP LTD 7,179.0000 Shares 378,620.46
PERRIGO CO PLC 2,741.0000 Shares 88,205.38
ELDORADO GOLD CORP 21,651.0000 Shares 280,813.47
WEATHERFORD INTL PLC 5,185.0000 Shares 507,248.55
NOBLE CORP PLC 8,531.0000 Shares 410,852.96
NOMAD FOODS LTD 12,513.0000 Shares 212,095.35
SHARKNINJA INC 3,341.0000 Shares 170,958.97
INTL GAME TECH PLC 1,656.0000 Shares 45,390.96
ACADIA HEALTHCARE CO INC 11,744.0000 Shares 913,213.44
ADVANCED DRAINAGE SYS INC 7,470.0000 Shares 1,050,580.80
ALARM.COM HLDGS INC 9,206.0000 Shares 594,891.72
AMICUS THERAPEUTICS INC 47,960.0000 Shares 680,552.40
AXON ENTERPRISE INC 4,466.0000 Shares 1,153,701.78
BWX TECH INC 17,666.0000 Shares 1,355,512.18
BIO TECHNE CORP 10,050.0000 Shares 775,458.00
BLUEPRINT MEDICINES CORP 7,770.0000 Shares 716,704.80
BRIGHT HORIZONS FAMILY SO 7,507.0000 Shares 707,459.68
BRINKS CO 10,103.0000 Shares 888,558.85
BUILDERS FIRSTSOURCE 5,020.0000 Shares 838,038.80
BURLINGTON STORES INC 2,510.0000 Shares 488,144.80
CF INDU HLDGS INC 9,420.0000 Shares 748,890.00
CARLYLE GROUP INC (THE) 31,090.0000 Shares 1,265,052.10
CASELLA WASTE SYS INC CL 8,710.0000 Shares 744,356.60
CERTARA INC 23,300.0000 Shares 409,847.00
CHARLES RIVER LABS INTL I 1,990.0000 Shares 470,436.00
CHART INDU INC 4,726.0000 Shares 644,295.58
CHEMED CORP 2,106.0000 Shares 1,231,483.50
CLEARWATER ANALYTICS HLDG 25,893.0000 Shares 518,636.79
COGNEX CORP 11,820.0000 Shares 493,366.80
CAMECO CORP 16,019.0000 Shares 690,418.90
CROWN HLDGS INC 9,535.0000 Shares 878,078.15
EVEREST GROUP LTD 1,550.0000 Shares 548,049.00
DYNATRACE INC 19,881.0000 Shares 1,087,291.89
ELF BEAUTY INC 8,400.0000 Shares 1,212,456.00
EAGLE MATERIALS INC 2,420.0000 Shares 490,872.80
ENCOMPASS HEALTH CORP 19,725.0000 Shares 1,316,052.00
ENTEGRIS INC 4,086.0000 Shares 489,584.52
EURONET WORLDWIDE INC 2,747.0000 Shares 278,793.03
EVOLENT HEALTH INC A 20,330.0000 Shares 671,499.90
EXLSVCS HLDGS INC 14,030.0000 Shares 432,825.50
FLYWIRE CORP 22,120.0000 Shares 512,078.00
FIVE BELOW INC 5,220.0000 Shares 1,112,695.20

(d) cost: Investment is participant directed, therefore historical cost is not required. 23

Ameren Corporation Savings Investment Plan

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

December 31, 2023

Name of plan sponsor: Ameren Corporation
Employer identification number: 43-1723446
Three-digit plan number: 003
(a) (b) (c) (d) (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
FRESHPET INC 14,147.0000 Shares 1,227,393.72
GLOBUS MEDICAL INC 6,590.0000 Shares 351,181.10
GUIDEWIRE SOFTWARE INC 10,569.0000 Shares 1,152,443.76
HEALTHEQ INC 9,333.0000 Shares 618,777.90
HEICO CORP CL A 5,809.0000 Shares 827,433.96
INSMED INC 17,243.0000 Shares 534,360.57
INSPIRE MEDICAL SYS INC 3,397.0000 Shares 691,051.71
INSULET CORP 3,820.0000 Shares 828,863.60
KOSMOS ENERGY LTD 65,760.0000 Shares 441,249.60
LANCASTER COLONY CORP 6,164.0000 Shares 1,025,627.96
LATTICE SEMICONDUCTOR COR 5,980.0000 Shares 412,560.20
LIVE NATION ENTERTAINMENT 7,306.0000 Shares 683,841.60
MERCURY SYS INC 23,983.0000 Shares 877,058.31
MERIT MEDICAL SYS INC 13,280.0000 Shares 1,008,748.80
NATIONAL VISION HLDGS INC 36,171.0000 Shares 757,059.03
NEOGEN CORP 31,690.0000 Shares 637,285.90
NEW FORTRESS ENERGY INC 24,404.0000 Shares 920,762.92
NICE LTD SPON ADR 4,443.0000 Shares 886,422.93
NOVANTA INC 4,160.0000 Shares 700,585.60
PENUMBRA INC 3,994.0000 Shares 1,004,650.76
POOL CORP 2,990.0000 Shares 1,192,142.90
REGAL REXNORD CORP 2,610.0000 Shares 386,332.20
REPLIGEN 4,160.0000 Shares 747,968.00
REVOLVE GROUP INC 22,817.0000 Shares 378,305.86
SPS COMMERCE INC 2,370.0000 Shares 459,400.80
SHOALS TECH GROUP INC 20,941.0000 Shares 325,423.14
SITEONE LANDSCAPE SUPPLY 2,810.0000 Shares 456,625.00
SUPER MICRO COMPUTER INC 2,370.0000 Shares 673,696.20
TENABLE HLDGS INC 15,630.0000 Shares 719,917.80
TOPBUILD CORP 1,950.0000 Shares 729,807.00
TRADEWEB MARKETS INC A 8,362.0000 Shares 759,938.56
TREX CO INC 9,084.0000 Shares 752,064.36
TWIST BIOSCIENCE CORP 15,463.0000 Shares 569,966.18
TYLER TECH INC 2,190.0000 Shares 915,682.80
VARONIS SYS INC 13,470.0000 Shares 609,921.60
VIRTU FIN INC- CL A 27,127.0000 Shares 549,593.02
WESTERN ALLIANCE BANCORP 8,195.0000 Shares 539,149.05
WILLSCOT MOBILE MINI HLDG 8,530.0000 Shares 379,585.00
WHITECAP RESOURCES INC 61,080.0000 Shares 410,640.84
AMBARELLA INC 5,980.0000 Shares 366,514.20
TECHNIPFMC PLC 16,400.0000 Shares 330,296.00
FIRSTSVCS CORP 3,615.0000 Shares 585,955.35
NOBLE CORP PLC 8,340.0000 Shares 401,654.40
ABIOMED INC CVR 2,179.0000 Shares 6,057.62
ASCENDIS PHARMA AS SPON ADR 15,700.0000 Shares 1,977,415.00
AVANTOR INC 38,075.0000 Shares 869,252.25
AVERY DENNISON CORP 6,240.0000 Shares 1,261,478.40
AXCELIS TECH INC 3,040.0000 Shares 394,257.60
AXON ENTERPRISE INC 5,710.0000 Shares 1,475,064.30
BIO RAD LABS CL A 1,910.0000 Shares 616,719.90
BLUE OWL CAPITAL INC A 58,650.0000 Shares 873,885.00
BOOZ ALLEN HAMILTON HLDG 4,290.0000 Shares 548,733.90
BRIGHT HORIZONS FAMILY SO 8,850.0000 Shares 834,024.00
BUILDERS FIRSTSOURCE 10,230.0000 Shares 1,707,796.20
COMFORT SYS USA INC 3,210.0000 Shares 660,200.70
DECKERS OUTDOOR CORP 1,288.0000 Shares 860,937.84

(d) cost: Investment is participant directed, therefore historical cost is not required. 24

Ameren Corporation Savings Investment Plan

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

December 31, 2023

Name of plan sponsor: Ameren Corporation
Employer identification number: 43-1723446
Three-digit plan number: 003
(a) (b) (c) (d) (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
DYNATRACE INC 16,830.0000 Shares 920,432.70
EAST WEST BANCORP INC 13,000.0000 Shares 935,350.00
FLYWIRE CORP 35,180.0000 Shares 814,417.00
F5 INC 4,800.0000 Shares 859,104.00
FIVE BELOW INC 5,295.0000 Shares 1,128,682.20
HARMONIC INC 21,090.0000 Shares 275,013.60
HEXCEL CORPORATION 10,430.0000 Shares 769,212.50
HUBBELL INC 4,000.0000 Shares 1,315,720.00
IDEX CORPORATION 4,660.0000 Shares 1,011,732.60
IMPINJ INC 4,090.0000 Shares 368,222.70
INSPIRE MEDICAL SYS INC 4,020.0000 Shares 817,788.60
INSULET CORP 5,330.0000 Shares 1,156,503.40
LPL FINL HLDGS INC 5,110.0000 Shares 1,163,138.20
LANTHEUS HLDGS INC 11,780.0000 Shares 730,360.00
LATTICE SEMICONDUCTOR COR 6,370.0000 Shares 439,466.30
LEGEND BIOTECH CORP SPON ADR 15,110.0000 Shares 909,168.70
LINCOLN ELECTRIC HLDGS IN 6,065.0000 Shares 1,318,894.90
M/I HOMES INC 9,790.0000 Shares 1,348,474.60
MKS INSTRUMENTS INC 2,860.0000 Shares 294,208.20
MACOM TECH SOLUTIONS HLDG 6,570.0000 Shares 610,681.50
MARQETA INC CL A 41,930.0000 Shares 292,671.40
MASIMO CORP 5,420.0000 Shares 635,278.20
NEUROCRINE BIOSCIENCES IN 8,480.0000 Shares 1,117,324.80
NICE LTD SPON ADR 4,945.0000 Shares 986,576.95
OKTA INC CL A 7,020.0000 Shares 635,520.60
OPTION CARE HEALTH INC 35,580.0000 Shares 1,198,690.20
OVINTIV INC 20,695.0000 Shares 908,924.40
PTC INC 6,960.0000 Shares 1,217,721.60
PAYLOCITY HLDGS CORP 6,625.0000 Shares 1,092,131.25
PERMIAN RESOURCES CORP CL 68,080.0000 Shares 925,888.00
PLEXUS CORP 4,250.0000 Shares 459,552.50
POOL CORP 1,780.0000 Shares 709,703.80
PURE STORAGE INC CL A 17,800.0000 Shares 634,748.00
RED ROCK RESORTS INC 19,950.0000 Shares 1,063,933.50
REGAL REXNORD CORP 3,650.0000 Shares 540,273.00
REPLIGEN 4,290.0000 Shares 771,342.00
ROCKET PHARMACEUTICALS IN 31,555.0000 Shares 945,703.35
SAIA INC 2,725.0000 Shares 1,194,149.50
SILICON MOTION TECH CORP ADR 5,830.0000 Shares 357,204.10
SMARTSHEET INC 15,740.0000 Shares 752,686.80
SUN COMMUNITIES INC—REI 8,270.0000 Shares 1,105,285.50
TAPESTRY INC 15,520.0000 Shares 571,291.20
TENABLE HLDGS INC 13,830.0000 Shares 637,009.80
TEXAS ROADHOUSE INC 7,130.0000 Shares 871,499.90
TRADEWEB MARKETS INC A 6,900.0000 Shares 627,072.00
TRANSUNION 8,295.0000 Shares 569,949.45
VAXCYTE INC 9,300.0000 Shares 584,040.00
VERTIV HLDGS CO 21,430.0000 Shares 1,029,282.90
WILLSCOT MOBILE MINI HLDG 24,045.0000 Shares 1,070,002.50
GENPACT LTD 23,010.0000 Shares 798,677.10
BRP INC 7,150.0000 Shares 512,583.50
MONDAY.COM LTD 4,460.0000 Shares 837,632.60
Total Common Stocks 642,501,202.94
Preferred Stocks
DR ING HC F PORSCHE AG PF 2,170.0000 Shares 191,406.16

(d) cost: Investment is participant directed, therefore historical cost is not required. 25

Ameren Corporation Savings Investment Plan

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

December 31, 2023

Name of plan sponsor: Ameren Corporation
Employer identification number: 43-1723446
Three-digit plan number: 003
(a) (b) (c) (d) (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
Total Preferred Stocks 191,406.16
Notes Receivable
* /** Participants Participant Loans 34,624,462.92
$ 2,956,176,331.55
  • Investment represents allowable transaction with a party-in-interest.

** Interest rates vary from 4.00% to 10.50% on loans maturing through December 2033.

(d) cost: Investment is participant directed, therefore historical cost is not required. 26

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

June 25, 2024

27

EXHIBIT INDEX

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

28

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