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AMEREN CORP

Regulatory Filings Oct 27, 2023

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11-K/A 1 d559313d11ka.htm 11-K/A 11-K/A

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

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, 2017

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, 2017, as filed with the U.S. Securities and Exchange Commission on June 15, 2018 (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 15, 2018. The Report of Independent Registered Public Accounting Firm included in the Amendment is dated June 15, 2018, 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.

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Ameren Corporation

Savings Investment Plan

Financial Statements and Supplemental Schedule

December 31, 2017 and 2016

Index

Report of Independent Registered Public Accounting Firm December 31, 2017 and 2016 1-2
Financial Statements
Statements of Net Assets Available for Benefits December 31, 2017 and 2016 3
Statements of Changes in Net Assets Available for Benefits Years Ended December 31, 2017 and 2016 4
Notes to Financial Statements December 31, 2017 and 2016 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, 2017 1-10
  • 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, 2017 and 2016, 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, 2017 and 2016, 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 in accordance with the standards of the PCAOB. 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 in accordance with the standards of the PCAOB.

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, 2017 and Schedule G, Part III – Schedule of Nonexempt Transactions for the year ended December 31, 2017 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 15, 2018, 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, 2017 and 2016

2017 2016
Assets
Investments, at fair value $ 2,103,516,154 $ 1,794,642,191
Investments, at contract value 281,815,710 299,821,780
Total investments 2,385,331,864 2,094,463,971
Cash 3,324,143 1,807,150
Receivables
Notes receivable from participants 35,190,999 34,530,404
Participant contributions 519,393 1,078,010
Employer contributions 158,771 322,437
Dividends and interest 515,423 458,599
Due from brokers for securities sold 28,383,718 6,534,911
Total receivables 64,768,304 42,924,361
Total assets 2,453,424,311 2,139,195,482
Liabilities
Accrued expenses 581,193 340,926
Due to brokers for securities purchased 35,116,737 14,236,300
Total liabilities 35,697,930 14,577,226
Net assets available for benefits $ 2,417,726,381 $ 2,124,618,256

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, 2017 and 2016

2017 2016
Additions:
Investment income
Interest and dividends $ 31,373,733 $ 22,418,798
Net appreciation in fair value of investments 310,691,227 157,034,429
Total investment income 342,064,960 179,453,227
Interest on notes receivable from participants 1,462,340 1,390,534
Participant contributions 85,553,891 83,371,122
Employer contributions 30,195,212 29,197,593
Total additions 459,276,403 293,412,476
Deductions:
Benefits paid to participants 162,432,457 131,144,664
Administrative expenses 3,735,821 3,600,394
Total deductions 166,168,278 134,745,058
Net increase 293,108,125 158,667,418
Net assets available for benefits
Beginning of year 2,124,618,256 1,965,950,838
End of year $ 2,417,726,381 $ 2,124,618,256

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, 2017 and 2016

  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, 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 upon employment, and part-time or temporary employees are eligible to participate upon completion of a year of service of at least 1,000 hours. 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, 2017 and 2016

The Plan permits “catch-up” contributions for all employees age 50 and older. Eligible employees could contribute $6,000 in 2017 and 2016, as a “catch-up” contribution. 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.

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, 2017 and 2016, 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. 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

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Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2017 and 2016

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, 2017 and 2016. 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 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.

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Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2017 and 2016

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

Investment securities are exposed to various risks, such as interest rate, market and credit. Due to the level of risk associated with certain investment securities and the level of uncertainty related to changes in the value of investment securities, 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 Statement of Net Assets Available for Benefits.

Concentrations

Company common stock comprised 12% and 13% of investments at December 31, 2017 and December 31, 2016, respectively.

  1. Fair Value Measurements

The authoritative guidance issued by 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.

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Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2017 and 2016

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;

• 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 2017 or 2016.

The asset 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.

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 2017.

• Margin deposit account: The fair value is estimated to approximate deposit account balances, payable on demand, as no discounts for credit quality or liquidity were determined to be applicable (Level 2 inputs).

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

• U.S. government securities and corporate debt securities: Valued based upon recent bid prices or the average of recent bid and asked prices when available (Level 2 inputs) and, if not available, they are valued through matrix pricing models developed by sources considered by management to be reliable. Matrix pricing, which is a mathematical technique commonly used to price debt securities that are not actively traded, values debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities’ relationship to other benchmark quoted securities (Level 2 inputs).

• Other debt securities includes non-U.S. government debt securities, municipal securities, mortgage and asset-backed securities, and derivatives: Non-U.S. government debt securities, municipal securities, and mortgage and asset-backed securities are valued based upon recent bid prices or the average of recent bid and asked prices when available (Level 2 inputs) and, if not available, they are valued through matrix pricing models developed by sources considered by management to be reliable. Matrix pricing, which is a mathematical technique commonly used to price debt securities that are not actively traded, values debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities’ relationship to other benchmark quoted securities (Level 2 inputs). The fair values of exchange-traded derivatives are based upon quoted market prices (Level 1 inputs). The fair values of derivatives that are not traded on an exchange are based upon valuation models using observable market data as of the measurement date (Level 2 inputs).

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Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2017 and 2016

• 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 net asset value (NAV) and to transact at that price. The mutual funds held by the Plan are deemed to be actively traded.

• Collective trust funds: The fair values of participation units held in collective trusts are based on the 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 as of daily or monthly valuation dates, as applicable, and are executed at NAV as a practical expedient.

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, 2017:

Quoted Prices In Active Markets for Identified Assets (Level 1) Significant Other Observable Inputs (Level 2) Total
Assets
Margin deposit account $ — $ 66,700 $ — $ 66,700
Common stocks-Plan sponsor stock 283,192,998 — — 283,192,998
Common stocks-other than Plan sponsor stock 254,470,852 — — 254,470,852
U.S. Government securities — 20,120,627 — 20,120,627
Corporate debt securities — 29,168,729 — 29,168,729
Other debt securities 6,742 13,292,371 — 13,299,113
Collective trust funds — — 1,319,699,694 1,319,699,694
Mutual funds 183,498,080 — — 183,498,080
Liabilities
Other debt securities — (639 ) — (639 )
Total assets reported at fair value $ 721,168,672 $ 62,647,788 $ 1,319,699,694 $ 2,103,516,154

(a) In accordance with ASU 2015-07, certain investments measured at net asset value (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, 2017 and 2016

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, 2016:

Quoted Prices In Active Markets for Identified Assets (Level 1) Total
Assets
Margin deposit account $ — $ 100,200 $ — $ 100,200
Common stocks-Plan sponsor stock 268,844,805 — — 268,844,805
Common stocks-other than Plan sponsor stock 223,472,836 — — 223,472,836
U.S. Government securities — 14,157,327 — 14,157,327
Corporate debt securities — 25,756,145 — 25,756,145
Other debt securities 1,500 5,517,816 — 5,519,316
Collective trust funds — — 1,088,860,727 1,088,860,727
Mutual funds 167,941,974 — — 167,941,974
Liabilities
Other debt securities (9,930 ) (1,209 ) — (11,139 )
Total assets reported at fair value $ 660,251,185 $ 45,530,279 $ 1,088,860,727 $ 1,794,642,191

(a) In accordance with ASU 2015-07, certain investments measured at net asset value (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 a money market mutual fund, and (2) a portfolio of synthetic investment contracts, valued at $281,815,710 and $299,821,780 at December 31, 2017 and December 31, 2016, 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 are issued by the following insurance companies:

• American General Life Insurance Company (“AGL”)

• Prudential Insurance Company of America (“Prudential”)

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

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

• Metropolitan Life Insurance Company (“Met Life”)

The underlying investments of the AGL, Prudential, and Voya contracts are holdings in collective trust funds. The underlying investments of the Mass Mutual and Met Life contracts are holdings in portfolios of fixed income securities, which are segregated from the insurance company’s general account assets. The segregation of these assets from the insurance company’s general account offers certain protections to mitigate the risk that these assets might be subject to creditor claims other than those of the separate account GIC owners.

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Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2017 and 2016

The investment contracts include wrapper contracts, which are agreements for the wrap issuer to make payments to the Plan in certain circumstances. The wrapper contract typically includes certain conditions and limitations on the underlying assets owned by the Plan. The contracts are designed to accrue interest based on crediting rates established by the contract issuers, and also provide a guarantee that the credit rate will not fall below zero percent. Cash flow volatility (for example, timing of benefit payments) as well as asset underperformance can be passed through to the Plan through adjustments to future contract crediting rates. Formulas are provided in each contract that adjusts renewal crediting rates to recognize the difference between the fair value and the book value of the underlying assets. 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 issuer’s ability to meet its financial obligations. The 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 are 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; however, such events may include all or a portion of the following:

• material amendments to the account’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 investment, 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 interests in the 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 account or participating plans;

• the delivery of any communication to Participants designed to influence a participant not to invest in the investment option;

• the addition of an Asset Allocation or Managed Account service without prior approval, or a material change in an existing program;

• the distribution of a prohibited communication.

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Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2017 and 2016

No events are probable of occurring that might limit the ability of the Plan to transact at contract value with the contract issuers and that also would limit the ability of the Plan to transact at contract value with the Participants.

These 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 contract if the contract value or the fair value of the underlying portfolio equals zero. The issuer is obligated to pay the excess contract value when the fair value is below contract value at the time of termination. In addition, if the Company defaults in its obligations under the contract (including the 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 contract, then the contract may be terminated by the 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, 2017, the Plan held 4,800,695 shares of Company common stock with a cost and fair value of $194,108,887 and $283,192,998, respectively. During 2017, the Plan purchased 734,900 shares at a cost of $41,768,247 and sold 1,058,963 shares valued at $59,847,989.

At December 31, 2016, the Plan held 5,124,758 shares of Company common stock with a cost and fair value of $193,417,367 and $268,844,805, respectively. During 2016, the Plan purchased 772,300 shares at a cost of $37,758,809 and sold 899,300 shares valued at $43,880,275.

Dividend income from Company common stock was $8,650,773 and $8,808,189 for the years ended December 31, 2017 and December 31, 2016, respectively.

At December 31, 2017 and December 31, 2016, 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 and trust services were $908,576 and $1,118,005 for the years ended December 31, 2017 and December 31, 2016, respectively.

Fees paid to and investments issued by various 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, 2017 and 2016

  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, 2017 and 2016:

Net assets available for benefits per the financial statements 2017 — $ 2,417,726,381 $ 2,124,618,256
Amounts allocated to deemed distributions of notes receivable from Participants (1,364,562 ) (1,343,400 )
Adjustment from contract value to fair value for fully benefit-responsive investment
contracts (711,990 ) (646,579 )
Net assets available for benefits per the Form 5500 $ 2,415,649,829 $ 2,122,628,277

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, 2017:

Net increase in net assets available for benefits per the financial statements $
Add: Adjustment from contract value to fair value for fully benefit-responsive investment
contracts as of the current year-end (711,990 )
Less: Adjustment from contract value to fair value for fully benefit-responsive investment
contracts as of the prior year-end 646,579
Add: Net decrease in defaulted notes receivable from Participants 81,292
Less: Interest income of defaulted notes receivable from Participants (102,454 )
Total net income per the Form 5500 $ 293,021,552
  1. Federal Income Tax Status

The Company obtained a determination letter September 18, 2013, 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. See Note 8 Subsequent Events, which states that the Company received its most recent determination letter on January 12, 2018.

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

14

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Ameren Corporation

Savings Investment Plan

Notes to Financial Statements

December 31, 2017 and 2016

Plan, and has concluded that as of December 31, 2017 and 2016, 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 2014.

  1. Subsequent Events

The Plan was amended effective January 1, 2018, to apply provisions of a 2017 union labor contract negotiation.

The Company received its most recent determination letter on January 12, 2018.

15

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Ameren Corporation Savings Investment Plan

SCHEDULE G, PART III - Schedule of Nonexempt Transactions

For the year ended December 31, 2017

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 2017 plan year was $173,447 - VFCP filed $ 173,447 $ 85,388

1

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Ameren Corporation Savings Investment Plan

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

December 31, 2017

Name of plan sponsor: Ameren Corporation

Employer identification number: 43-1723446

Three-digit plan number: 003

(a) (b) Identity of issue, borrower, lessor, or similar party (c) Description of investment including maturity date, rate of interest, collateral, par, or maturity value (d) Cost (e) Current value
Interest-bearing Cash
State Street Global Advisors SSGA Short Term Investment Fund 11,365,135 11,365,135
FUTURES CASH COLLATERAL 48,000.00 Shares 48,000 48,000
SWAP COLLATERAL USD 18,700.00 Shares 18,700 18,700
Total Interest-bearing Cash 11,431,835 11,431,835
Mutual Funds
American Funds Group EuroPacific Growth Fund 97,883,600 127,940,721
Sands Capital Management Touchstone Sands Capital Institutional Growth Fund 39,617,721 42,609,879
* Fidelity Management Trust Company Fidelity Institutional Money Market Government Portfolio 12,947,480 12,947,480
Total Mutual Funds 150,448,801 183,498,080
Collective Investment Trusts
Robeco Trust Company Boston Partners Large Cap Value Equity Fund E 58,575,364 84,851,768
Nuveen Fund Advisors NWQ Small/Mid Cap Value Fund J 52,420,512 84,480,800
Wells Fargo Bank, N.A. Wells Fargo Fixed Income Fund F 72,647,827 76,228,492
Wells Fargo Bank, N.A. Wells Fargo Fixed Income Fund L 97,096,951 100,415,571
BlackRock Institutional Trust Company, N.A. BlackRock Equity Index Fund M 227,500,884 295,546,218
BlackRock Institutional Trust Company, N.A. BlackRock Russell 2500 Fund M 137,712,198 176,176,488
BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2020 Fund L 83,161,724 93,670,373
BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2025 Fund L 91,823,791 105,219,271
BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2030 Fund L 61,792,834 72,572,730
BlackRock Institutional Trust Company, N.A. BlackRock MSCI ACWI ex-US IMI Index Fund
M 76,767,364 97,272,356
BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index Retirement Fund L 31,416,045 34,830,799
BlackRock Institutional Trust Company, N.A. BlackRock US Debt Index Fund M 72,405,097 73,702,768
BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2035 Fund L 33,671,167 40,395,580
BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2040 Fund L 33,083,506 40,054,168
BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2045 Fund L 30,725,331 37,660,693
BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2050 Fund L 27,242,053 33,343,382
BlackRock Institutional Trust Company, N.A. BlackRock TIPS Bond Index Fund M 17,406,120 17,812,022
BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2055 Fund L 15,102,515 18,284,787
BlackRock Institutional Trust Company, N.A. BlackRock LifePath Index 2060 Fund L 2,263,098 2,460,356
Total Collective Investment Trusts 1,222,814,381 1,484,978,622
Pooled Separate Account
Massachusetts Mutual Life Ins. Co. Separate Account #SB56 37,231,301 37,232,881
Insurance Company Separate Accounts
Metropolitan Life Ins Co. Separate Account #690 23,955,127 25,173,309
Metropolitan Life Ins Co. Separate Account #694 40,968,295 42,053,467
Total Insurance Company Separate Accounts 64,923,422 67,226,776
Common Stocks
* Ameren Corporation 4,800,695 Shares 194,108,887 283,192,998
BROADCOM LTD 2,989 Shares 707,003 767,874
TENCENT HOLDINGS LTD 46,932 Shares 827,256 2,438,853
ALLERGAN PLC 6,462 Shares 1,671,871 1,057,054
ABBOTT LABORATORIES 20,218 Shares 869,770 1,153,841
ABBVIE INC 10,933 Shares 984,928 1,057,330
ACTIVISION BLIZZARD INC 14,046 Shares 700,750 889,393
ADOBE SYSTEMS INC 11,726 Shares 706,710 2,054,864
ALBEMARLE CORP 7,862 Shares 717,141 1,005,471
ALEXION PHARMACEUTICALS 6,688 Shares 929,027 799,818

1

Table of Contents

Ameren Corporation Savings Investment Plan

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

December 31, 2017

Name of plan sponsor: Ameren Corporation

Employer identification number: 43-1723446

Three-digit plan number: 003

(a) (c) Description of investment including maturity date, rate of interest, collateral, par, or maturity value (d) Cost (e) Current value
ALIBABA GROUP HLD SPON AD 15,478 Shares 1,287,142 2,668,872
ALPHABET INC CL C 2,356 Shares 1,064,436 2,465,318
ALPHABET INC CL A 1,991 Shares 806,651 2,097,319
AMAZON.COM INC 3,260 Shares 962,975 3,812,472
APPLE INC 19,663 Shares 1,888,395 3,327,569
BIOMARIN PHARMACEUTICAL 10,960 Shares 867,911 977,303
BOEING CO 7,616 Shares 810,624 2,246,035
BRISTOL-MYERS SQUIBB CO 27,041 Shares 1,470,954 1,657,072
CELGENE CORP 11,733 Shares 1,167,391 1,224,456
CHARTER COMM INC A 2,771 Shares 854,790 930,945
CONCHO RESOURCES INC 6,459 Shares 554,889 970,271
CONSTELLATION BRANDS CL A 3,836 Shares 662,472 876,795
CORNING INC 8,006 Shares 253,400 256,112
COSTCO WHOLESALE CORP 7,642 Shares 1,018,884 1,422,329
CROWN CASTLE INTL CORP 3,928 Shares 382,816 436,047
EOG RESOURCES INC 11,543 Shares 894,937 1,245,605
FACEBOOK INC A 20,170 Shares 782,975 3,559,198
FLEETCOR TECHNOLOGIES INC 5,755 Shares 763,314 1,107,435
GOLDMAN SACHS GROUP INC 5,984 Shares 996,724 1,524,484
ADIDAS AG 964 Shares 153,108 193,335
HALLIBURTON CO 28,090 Shares 1,279,905 1,372,758
HOME DEPOT INC 9,885 Shares 1,428,656 1,873,504
ILLUMINA INC 3,899 Shares 361,776 851,893
JPMORGAN CHASE & CO 7,100 Shares 565,231 759,274
KERING UNSPONSORED ADR 22,185 Shares 968,663 1,044,248
ESTEE LAUDER COS INC CL A 9,910 Shares 1,111,917 1,260,948
MARRIOTT INTL INC A 14,035 Shares 868,976 1,904,971
MASTERCARD INC CL A 18,382 Shares 937,985 2,782,300
MICROSOFT CORP 32,302 Shares 1,775,016 2,763,113
MONDELEZ INTL INC 19,578 Shares 656,222 837,938
MONSTER BEVERAGE CORP 20,084 Shares 1,017,584 1,271,116
NETFLIX INC 14,584 Shares 1,175,916 2,799,545
NIKE INC CL B 26,457 Shares 812,403 1,654,885
NVIDIA CORP 7,430 Shares 372,761 1,437,705
PARKER HANNIFIN CORP 8,892 Shares 1,394,389 1,774,665
PAYPAL HLDGS INC 11,284 Shares 795,522 830,728
PRICELINE GROUP INC 742 Shares 583,170 1,289,403
QUALCOMM INC 12,647 Shares 754,372 809,661
RED HAT INC 11,059 Shares 596,158 1,328,186
S&P GLOBAL INC 5,345 Shares 473,034 905,443
SALESFORCE.COM INC 20,810 Shares 1,115,063 2,127,406
SPLUNK INC 9,200 Shares 385,245 762,128
TESLA INC 2,140 Shares 480,810 666,289
TIME WARNER INC 7,627 Shares 662,393 697,642
UNITEDHEALTH GROUP INC 5,731 Shares 1,076,702 1,263,456
VERTEX PHARMACEUTICALS 7,014 Shares 772,343 1,051,118
VISA INC CL A 23,190 Shares 988,633 2,644,124
WORKDAY INC CL A 8,098 Shares 560,883 823,891
WILLIS TOWERS WATSON PLC 17,677 Shares 2,032,227 2,663,747
BROADCOM LTD 13,374 Shares 1,802,199 3,435,781
JOHNSON CONTROLS INTERNAT 60,852 Shares 2,858,213 2,319,070
ARRIS INTERNATIONAL PLC 25,153 Shares 600,091 646,181
AERCAP HOLDINGS NV 33,414 Shares 978,690 1,757,911
SUNCOR ENERGY INC 81,304 Shares 1,884,912 2,985,483
TE CONNECTIVITY LTD 35,222 Shares 1,929,565 3,347,499

2

Table of Contents

Ameren Corporation Savings Investment Plan

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

December 31, 2017

Name of plan sponsor: Ameren Corporation

Employer identification number: 43-1723446

Three-digit plan number: 003

(a) (c) Description of investment including maturity date, rate of interest, collateral, par, or maturity value (d) Cost (e) Current value
AFLAC INC 35,609  Shares 2,066,708 3,125,758
AECOM 26,562  Shares 696,518 986,778
AETNA INC 19,470  Shares 2,000,548 3,512,193
AFFILIATED MANAGERS GRP 9,689  Shares 1,566,130 1,988,667
AMERIPRISE FINANCIAL INC 22,983  Shares 2,082,143 3,894,929
ANTHEM INC 15,503  Shares 1,998,116 3,488,330
ASSURANT INC 11,241  Shares 896,073 1,133,542
AVIS BUDGET GROUP 16,973  Shares 429,062 744,775
CELANESE CORP SER A 25,909  Shares 1,665,313 2,774,336
COMMSCOPE HOLDING CO INC 32,480  Shares 1,028,124 1,228,718
CORNING INC 103,184  Shares 1,932,013 3,300,856
FLEX LTD 97,627  Shares 1,635,813 1,756,310
EOG RESOURCES INC 25,929  Shares 1,835,162 2,797,998
GOODYEAR TIRE & RUBBER CO 45,123  Shares 1,276,328 1,457,924
HCA HEALTHCARE INC 36,188  Shares 2,801,843 3,178,754
HERTZ GLOBAL HOLDINGS INC 18,130  Shares 657,114 400,673
LIBERTY INTERACTIVE CL A 78,697  Shares 1,986,838 1,921,781
LINCOLN NATIONAL CORP 39,443  Shares 1,694,498 3,031,983
MICROSEMI CORP 17,824  Shares 680,172 920,610
NCR CORP 28,310  Shares 614,296 962,257
NATIONAL OILWELL VARCO 63,110  Shares 1,784,669 2,273,222
OWENS ILLINOIS INC 28,128  Shares 358,702 623,598
TENNECO INC 9,926  Shares 370,844 581,068
WESTERN DIGITAL CORP 34,866  Shares 1,701,541 2,772,893
WESTERN UNION CO 87,117  Shares 1,520,598 1,656,094
WHIRLPOOL CORP 12,128  Shares 2,272,093 2,045,266
SHOPIFY INC CL A (US) 2,393  Shares 156,784 241,693
MIMECAST LTD 27,876  Shares 758,143 799,205
NORWEGIAN CRUISE LINE HLG 17,197  Shares 892,076 915,740
AERIE PHARMACEUTICALS INC 9,634  Shares 554,428 575,632
AMETEK INC NEW 15,061  Shares 776,721 1,091,471
BLUEBIRD BIO INC 3,472  Shares 345,990 618,363
BORGWARNER INC 11,053  Shares 576,200 564,698
BRINKS CO 9,847  Shares 728,891 774,959
CELANESE CORP SER A 3,552  Shares 344,585 380,348
CHEGG INC 41,755  Shares 615,204 681,442
CHEMOURS CO/ THE 13,910  Shares 584,398 696,335
COGNEX CORP 8,614  Shares 295,805 526,832
COHERENT INC 1,467  Shares 182,322 414,017
COMERICA INC 12,680  Shares 872,166 1,100,751
COSTAR GROUP INC 1,867  Shares 475,135 554,406
CREE INC 7,582  Shares 264,704 281,595
DR HORTON INC 18,572  Shares 673,289 948,472
DARDEN RESTAURANTS INC 3,741  Shares 306,512 359,211
DIAMONDBACK ENERGY INC 8,464  Shares 872,629 1,068,580
E TRADE FINANCIAL CORP 19,428  Shares 846,197 963,046
EAST WEST BANCORP INC 10,472  Shares 575,566 637,012
FLIR SYSTEMS INC 11,685  Shares 534,888 544,755
FMC CORP NEW 14,744  Shares 1,100,655 1,395,667
FIRST SOLAR INC 5,230  Shares 311,743 353,130
FIVE9 INC 19,215  Shares 258,359 478,069
FLOOR & DECOR HLDGS CL A 5,319  Shares 226,537 258,929
G-III APPAREL GROUP LTD 23,243  Shares 681,416 857,434
GRUBHUB INC 10,190  Shares 529,372 731,642
GUESS INC 36,435  Shares 613,218 615,023

3

Table of Contents

Ameren Corporation Savings Investment Plan

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

December 31, 2017

Name of plan sponsor: Ameren Corporation

Employer identification number: 43-1723446

Three-digit plan number: 003

(a) (c) Description of investment including maturity date, rate of interest, collateral, par, or maturity value (d) Cost (e) Current value
IAC/INTERACTIVECORP 3,953  Shares 389,735 483,373
IPG PHOTONICS CORP 3,078  Shares 414,100 659,092
INSULET CORP 5,270  Shares 305,941 363,630
INTER PARFUMS INC 10,338  Shares 343,646 449,186
JOHN BEAN TECH CORP 3,616  Shares 317,435 400,653
KENNAMETAL INC 6,679  Shares 287,150 323,330
LULULEMON ATHLETICA INC 4,503  Shares 333,531 353,891
LUMBER LIQUIDATORS HLDNGS 7,258  Shares 260,461 227,829
MKS INSTRUMENTS INC 7,435  Shares 475,602 702,608
MELCO RESORTS & ENTERTAIN 23,895  Shares 649,965 693,911
MIDDLEBY CORP 4,544  Shares 581,675 613,213
MOHAWK INDUSTRIES INC 2,193  Shares 472,914 605,049
NEKTAR THERAPEUTICS 5,989  Shares 190,672 357,663
NEUROCRINE BIOSCIENCES 4,754  Shares 337,272 368,863
OLIN CORP 6,835  Shares 247,078 243,189
ON ASSIGNMENT INC 5,897  Shares 289,301 379,000
OWENS CORNING INC 5,376  Shares 411,219 494,269
POLARIS INDUSTRIES INC 4,563  Shares 536,270 565,766
RADIAN GROUP INC 28,792  Shares 596,280 593,403
RINGCENTRAL INC CL A 13,693  Shares 311,269 662,741
SVB FINL GROUP 2,493  Shares 544,459 582,789
SANTANDER CONSMR USA HLDG 32,675  Shares 546,196 608,409
SERVICENOW INC 3,595  Shares 203,311 468,752
SKECHERS USA INC CL A 18,149  Shares 609,491 686,758
SPLUNK INC 4,390  Shares 356,118 363,668
SQUARE INC CL A 16,357  Shares 207,353 567,097
STEEL DYNAMICS INC 11,332  Shares 439,961 488,749
TAKE-TWO INTERACTV SOFTWR 2,264  Shares 120,486 248,542
TELADOC INC 23,366  Shares 784,874 814,305
TERADYNE INC 24,109  Shares 821,833 1,009,444
TEREX CORP 10,060  Shares 335,706 485,093
TRACTOR SUPPLY CO. 2,740  Shares 198,975 204,815
TRANSUNION 8,592  Shares 320,096 472,216
TRIMBLE INC 15,962  Shares 474,570 648,696
2U INC 12,255  Shares 516,356 790,570
US CONCRETE INC C NEW 6,242  Shares 366,780 522,143
UNIVERSAL DISPLAY CORP 12,234  Shares 816,330 2,112,200
VAIL RESORTS INC 3,148  Shares 454,673 668,856
VOCERA COMMUNICATIONS INC 25,372  Shares 444,646 766,742
WABCO HOLDINGS INC 6,406  Shares 798,955 919,261
WELLCARE HEALTH PLANS INC 5,138  Shares 510,260 1,033,303
WYNN RESORTS LTD 5,029  Shares 592,837 847,839
YUM CHINA HOLDINGS INC 13,565  Shares 488,255 542,871
ZEBRA TECH CORP CL A 5,597  Shares 594,200 580,969
ZIONS BANCORP 19,371  Shares 748,959 984,628
HORIZON PHARMA PLC 53,900  Shares 674,466 786,940
OM ASSET MANAGEMENT PLC 23,207  Shares 396,691 388,717
AXALTA COATING SYS LTD 18,200  Shares 517,493 588,952
FIRSTSERVICE CORP (US) 7,705  Shares 176,765 538,734
ENCOMPASS HEALTH CORP 16,086  Shares 572,276 794,809
ABIOMED INC 4,530  Shares 313,724 848,967
ADTALEM GLOBAL EDUCATION 20,767  Shares 492,539 873,252
AFFILIATED MANAGERS GRP 3,312  Shares 488,690 679,788
ARISTA NETWORKS INC 2,679  Shares 205,985 631,119
BWX TECHNOLOGIES INC 25,681  Shares 1,027,009 1,553,444

4

Table of Contents

Ameren Corporation Savings Investment Plan

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

December 31, 2017

Name of plan sponsor: Ameren Corporation

Employer identification number: 43-1723446

Three-digit plan number: 003

(a) (c) Description of investment including maturity date, rate of interest, collateral, par, or maturity value (d) Cost (e) Current value
BALL CORP 27,310  Shares 1,021,834 1,033,684
BANK OF THE OZARKS INC 20,620  Shares 890,036 999,039
BOOZ ALLEN HAMILTON CL A 27,733  Shares 691,039 1,057,459
CBOE GLOBAL MARKETS INC 6,290  Shares 252,192 783,671
CSRA INC 16,900  Shares 471,621 505,648
CABLE ONE INC W/I 450  Shares 212,769 316,508
CAMBREX CORP 14,692  Shares 701,134 705,216
CARRIZO OIL & GAS INC 9,190  Shares 418,612 195,563
CELANESE CORP SER A 8,670  Shares 444,563 928,384
CHARLES RIVER LABS INTL 7,810  Shares 858,700 854,805
COHERENT INC 2,050  Shares 522,606 578,551
COLLIERS INTL GRP INC 160  Shares 5,853 9,657
COLLIERS INTL GROUP (US) 6,054  Shares 164,523 365,359
COPART INC 40,640  Shares 1,084,133 1,755,242
COSTAR GROUP INC 4,932  Shares 662,703 1,464,557
DEXCOM INC 11,270  Shares 694,842 646,785
DIAMONDBACK ENERGY INC 5,650  Shares 425,525 713,313
DOMINOS PIZZA INC 6,590  Shares 1,281,181 1,245,246
DUN & BRADSTREET DEL NEW 3,887  Shares 444,470 460,260
EAST WEST BANCORP INC 6,850  Shares 386,387 416,686
ENCORE CAP GROUP INC 14,439  Shares 506,430 607,882
EURONET WORLDWIDE INC 7,890  Shares 667,893 664,890
EXACT SCIENCES CORP 9,879  Shares 123,479 519,043
FIRSTCASH INC 11,011  Shares 548,580 742,692
FIRSTSERVICE CORP 120  Shares 5,710 8,394
GLAUKOS CORP 11,522  Shares 380,366 295,539
GRAND CANYON EDUCATION 10,450  Shares 705,244 935,589
GUIDEWIRE SOFTWARE INC 13,702  Shares 581,480 1,017,511
HEICO CORP CL A 10,257  Shares 451,146 810,816
HEXCEL CORPORATION 12,930  Shares 544,355 799,721
HILTON GRAND VACATIONS 19,317  Shares 756,878 810,348
IDEXX LABS INC 3,596  Shares 411,882 562,342
ISHARES RUSSEL MIDCP GRWT 2,940  Shares 335,022 354,682
ISHARES RUSSELL 2000 GR E 6,950  Shares 1,223,742 1,297,565
JONES LANG LASALLE INC 5,017  Shares 560,321 747,182
J2 GLOBAL INC 6,816  Shares 357,035 511,404
LIGAND PHARMACEUTICALS 7,466  Shares 577,452 1,022,319
LIVE NATION ENTERTAINMENT 18,800  Shares 704,485 800,316
MARTIN MARIETTA MATERIALS 5,180  Shares 969,101 1,144,987
MAXLINEAR INC 23,114  Shares 585,950 610,672
MAXIMUS INC 12,820  Shares 712,863 917,656
MICHAELS COS INC 34,854  Shares 746,532 843,118
MIDDLEBY CORP 7,924  Shares 790,458 1,069,344
NATIONAL INSTRUMENT CORP 14,235  Shares 519,581 592,603
NICE LTD SPON ADR 4,730  Shares 415,803 434,734
NU SKIN ENTERPRISES CL A 4,817  Shares 209,986 328,664
REPLIGEN 10,595  Shares 341,286 384,387
ROGERS CORP 6,380  Shares 948,309 1,033,050
SITEONE LANDSCAPE SUPPLY 8,350  Shares 281,561 640,445
SIX FLAGS ENTERTAINMENT 19,440  Shares 837,279 1,294,121
TAKE-TWO INTERACTV SOFTWR 8,000  Shares 333,171 878,240
TELEDYNE TECHNOLOGIES INC 4,480  Shares 819,605 811,552
TORO CO 6,351  Shares 220,142 414,276
TRACTOR SUPPLY CO. 8,930  Shares 617,863 667,518
TRANSUNION 16,120  Shares 612,237 885,955

5

Table of Contents

Ameren Corporation Savings Investment Plan

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

December 31, 2017

Name of plan sponsor: Ameren Corporation

Employer identification number: 43-1723446

Three-digit plan number: 003

(a) (c) Description of investment including maturity date, rate of interest, collateral, par, or maturity value (d) Cost (e) Current value
2U INC 12,248  Shares 247,146 790,118
UNIVERSAL ELECTRONICS INC 10,050  Shares 668,877 474,863
VAIL RESORTS INC 2,530  Shares 411,876 537,549
VANTIV INC 14,019  Shares 483,111 1,031,097
VEEVA SYS INC CL A 12,470  Shares 438,097 689,342
VIRTU FINANCIAL INC CL A 21,604  Shares 438,795 395,352
WEST PHARMACEUTICAL SVCS 5,870  Shares 534,760 579,192
WEX INC 7,780  Shares 871,950 1,098,768
YELP INC 18,590  Shares 809,738 780,035
Total Common Stocks 370,286,082 537,663,850
U.S. Government Securities
USTN 1.75% 09/30/22 3,490,000  Shares 3,441,576 3,419,645
FHLG 30YR 3% 03/45#G08631 820,000  Shares 600,721 602,460
FHLG 30YR 3.5% 11/47#G08788 600,000  Shares 610,674 612,333
FHLG 30YR 3% 06/46#Q41083 1,000,000  Shares 928,333 922,656
FNMA 30YR 3% 02/48 #TBA 965,000  Shares 959,421 964,024
FNMA 30YR 3.5% 02/48 #TBA 3,235,000  Shares 3,305,766 3,317,429
FNMA 30YR 4% 02/48 #TBA 1,390,000  Shares 1,447,880 1,451,982
FNMA 30YR 4.5% 02/48 #TBA 1,015,000  Shares 1,076,217 1,078,644
FNMA 30YR 4% 03/45#AS4630 790,000  Shares 431,534 425,638
FNMA 30YR 4.0% 07/45#AS5380 870,000  Shares 565,589 554,277
FNMA 3.5% 09/45#AS5722 335,000  Shares 245,419 240,793
FNMA 30YR 3.5% 05/46#AS7245 335,000  Shares 290,406 282,108
FNMA 30YR 3.5% 06/46#AS7348 680,000  Shares 585,058 582,453
FNMA 30YR 3.5% 07/46#AS7544 1,140,000  Shares 1,047,922 1,054,917
FNMA 30YR 3% 08/46#AS7737 670,000  Shares 643,030 620,219
FANNIEMAE 30YR 3% 10/46#AS8186 675,000  Shares 648,776 627,525
FNMA 30YR 3.0% 5/43#AT2722 525,000  Shares 341,936 329,708
FNMA 30YR 4.0% 12/01/44#AX4873 652,928  Shares 378,930 374,255
FNMA 5.00% 5/38 #983077 3,730,000  Shares 213,863 209,833
FNMA 30YR 3.5% 01/01/45#MA2163 800,000  Shares 512,083 510,040
FNMA 30YR 4% 12/01/45#MA2484 755,000  Shares 570,062 559,307
FNMA 30YR 3% 11/46#MA2806 235,000  Shares 225,019 218,747
FNMA 30YR 4% 11/46#MA2808 660,000  Shares 563,105 564,718
FNMA 30YR 4% 07/47#MA3058 600,000  Shares 597,350 596,917
Total U.S. Government Securities 20,230,669 20,120,627
Corporate debt securities
TELENET FINANCE 5.5% 1/28 144A 200,000  Shares 200,000 199,500
UBS 7.125 PERP-20 AT1 7% 200,000  Shares 210,500 212,360
AFLAC INC 6.45% 8/15/40 61,000  Shares 76,431 83,536
AT&T INC 3.8% 03/15/22 490,000  Shares 502,404 506,347
AGRIUM INC 3.375% 03/15/25 200,000  Shares 194,888 200,880
AIRBUS SE 3.15% 04/10/27 144A 350,000  Shares 352,796 351,004
ALLSTATE CORP 5.75 8/53 175,000  Shares 189,870 190,925
ALTRIA GROUP INC 2.85% 8/09/22 150,000  Shares 148,557 150,964
AMERICAN AXLE 6.625% 10/15/22 100,000  Shares 103,690 103,750
AMERICAN EXPRESS 5.2% VAR PERP 185,000  Shares 187,334 190,088
AMERICAN TOWER CORP 5% 2/24 195,000  Shares 211,123 213,555
ANHEUSER-BUSCH 3.65% 2/1/26 300,000  Shares 309,990 309,516
APPLE INC 3.85% 5/4/43 150,000  Shares 136,974 155,703
ASHTEAD CAP 4.125% 8/25 144A 30,000  Shares 30,000 30,300
AUTONATION INC 4.5% 10/01/25 175,000  Shares 185,115 183,104
BAE SYSTEMS 3.85% 12/25 144A 135,000  Shares 133,407 139,968

6

Table of Contents

Ameren Corporation Savings Investment Plan

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

December 31, 2017

Name of plan sponsor: Ameren Corporation

Employer identification number: 43-1723446

Three-digit plan number: 003

(a) (c) Description of investment including maturity date, rate of interest, collateral, par, or maturity value (d) Cost (e) Current value
BNP PARIBAS VR 7.375% PRP 144A 200,000  Shares 225,500 231,000
BNP PARIBAS 4.375 5/12/26 144A 300,000  Shares 304,305 313,618
BP CAPITAL MKTS 2.52% 9/19/22 160,000  Shares 160,000 159,183
BAKER HUG 2.773% 12/15/22 144A 185,000  Shares 185,000 184,732
BANCO SANTANDER SA 3.8% 02/28 200,000  Shares 199,078 199,967
BANK OF AMR CORP 6.3% VAR PERP 140,000  Shares 145,832 158,200
BANK AMER FDG CORP 4% 04/01/24 238,000  Shares 247,773 251,545
BANK AMER CORP 4.25% 10/22/26 105,000  Shares 105,044 110,623
BOA 3.419%/VAR 12/20/28 144A 567,000  Shares 565,978 566,947
BANK NEW YORK 4.950/ VAR PERP 120,000  Shares 125,013 124,206
BARCLAYSPLC 3.65% 03/16/25 310,000  Shares 304,264 309,447
BED BATH & BEYOND 5.165% 08/44 175,000  Shares 160,477 153,824
BUNGE LTD FIN 3.25% 8/15/26 225,000  Shares 222,952 214,967
COMMUNITY HLTH 5.125 8/21 175,000  Shares 175,156 157,500
CNA FINANCIAL CORP 3.45% 08/27 185,000  Shares 184,932 182,255
CAPITAL ONE FIN PERP 180,000  Shares 184,894 186,300
CAPITAL ONE BK 3.375% 2/15/23 245,000  Shares 244,329 247,383
CHEMOURS CO 5.375% 05/15/2027 85,000  Shares 85,725 87,975
CHENIERE CORPUS 5.125% 06/27 60,000  Shares 60,263 62,064
CITIGROUP INC 4.5% 1/14/22 320,000  Shares 345,442 340,365
CITIGROUP INC 3.75% 06/16/24 145,000  Shares 149,828 150,368
CITIGROUP 4.3% 11/26 210,000  Shares 212,691 219,542
CITIGROUP INC 6.25%/VAR PERP 110,000  Shares 114,659 121,330
CITIGROUP 3.2% 10/21/26 155,000  Shares 149,030 153,746
COMCAST CORP 6.4% 5/15/38 140,000  Shares 179,357 188,920
CONOCOPHILLIPS 6.5% 2/01/39 70,000  Shares 88,362 97,889
CONSTELATION ENERGY5.15% 12/20 125,000  Shares 138,075 133,095
RABOBK NEDERLND 3.95% 11/09/22 320,000  Shares 335,853 333,587
CROWN CASTLE 3.7% 6/15/26 90,000  Shares 89,726 89,915
CUMMINS INC 4.875% 10/01/43 120,000  Shares 132,666 143,736
DEERE JOHN CAPIT 2.65% 6/24/24 315,000  Shares 315,287 311,933
DEUTSCHE AG NY 4.875/VAR 12/32 280,000  Shares 279,933 277,312
DISCOVER FIN SV 5.2% 4/22 140,000  Shares 154,098 150,673
DOMTAR CORP 6.75% 02/15/44 130,000  Shares 141,254 150,213
EBAY INC 3.8% 03/09/2022 205,000  Shares 207,502 212,784
ENSCO PLC 5.2% 3/15/25 125,000  Shares 96,250 106,250
EXELA INTER/FIN 10% 07/23 144A 75,000  Shares 75,000 72,938
FEDEX CORP 3.25% 04/01/2026 190,000  Shares 191,276 191,400
FIRSTENERGY 4.35% 01/25 144A 130,000  Shares 135,715 137,117
FORD MTR CR CO 3.81% 01/09/24 210,000  Shares 210,746 214,338
FRONTIER COMM 8.5% 4/15/20 32,000  Shares 34,352 26,560
GE CAP INTL 4.418% 11/15/35 265,000  Shares 281,883 286,598
GENERAL ELECTRIC 5.0%/VAR PERP 599,000  Shares 559,068 618,468
GENERAL MTRS FIN 5.75/VAR PERP 30,000  Shares 31,163 31,110
GENWORTH HLDGS 4.8% 02/15/24 105,000  Shares 90,979 89,250
GLENCORE 3.875% 10/27 144A 185,000  Shares 183,426 182,551
GSINC 5.25% 7/27/21 105,000  Shares 115,308 113,787
GOLDMAN SACHS GP 5.75% 1/24/22 710,000  Shares 809,955 787,182
GOLDMAN SCHS GRP INC 4% 3/3/24 205,000  Shares 216,251 215,030
GOLDMAN SACHS GROUP STEP PERP 120,000  Shares 122,247 127,500
HCA INC 5.5% 06/15/47 55,000  Shares 55,000 54,863
HSBC HOLDINGS 4.375% 11/23/26 200,000  Shares 208,794 208,747
HARMAN INTL IND 4.15% 05/15/25 115,000  Shares 115,539 118,877
HEINEKEN NV 3.5% 01/29/28 144A 210,000  Shares 212,348 214,178
HERTZ CORP 7.625% 6/1/22 144A 70,000  Shares 70,688 73,325

7

Table of Contents

Ameren Corporation Savings Investment Plan

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

December 31, 2017

Name of plan sponsor: Ameren Corporation

Employer identification number: 43-1723446

Three-digit plan number: 003

(a) (c) Description of investment including maturity date, rate of interest, collateral, par, or maturity value (d) Cost (e) Current value
HEXION US FIN 6.625% 4/20 130,000  Shares 118,431 116,675
ING GROEP NV 3.95% 03/29/27 200,000  Shares 199,738 208,446
INTEL CORP 3.15% 05/11/27 245,000  Shares 246,043 249,783
INTL PAPER CO GLB 8.7 6/15/38 110,000  Shares 153,496 166,270
JPMC CO 4.5% 1/24/22 400,000  Shares 434,100 427,972
JPM CHASE 6.75% PERP 315,000  Shares 346,826 356,738
JPMORGAN CHASE 2.95% 10/01/26 155,000  Shares 148,269 152,205
JPMC CO 4.26/VAR 02/22/48 210,000  Shares 221,645 227,295
JEFFERIES GROUP 4.85% 1/15/27 175,000  Shares 178,538 185,999
KEYCORP 5/VAR PERP 195,000  Shares 197,759 200,850
KRAFT HEINZ CO 4.375% 6/1/46 255,000  Shares 250,585 252,364
LYB INTL FIN BV 4.0% 07/15/23 235,000  Shares 248,169 245,957
LAND O LAKES INC 8% PERP 144A 125,000  Shares 125,000 140,000
LAZARD GROUP LLC 3.625% 3/1/27 280,000  Shares 280,007 279,342
LEVEL 3 FIN INC 5.25% 03/15/26 90,000  Shares 90,000 88,340
LIBERTY MUTUAL 4.95% 5/22 144A 405,000  Shares 441,503 436,959
LIFEPOINT HEALTH 5.375% 5/1/24 60,000  Shares 60,038 58,800
LINCOLN NATIONAL 3.35% 3/9/25 200,000  Shares 199,605 201,703
LOWES COS INC 3.1% 05/03/2027 210,000  Shares 210,263 210,681
METLIFE INC 5.25/VAR PERP 195,000  Shares 202,473 201,948
MICROSOFT 3.3% 02/06/27 300,000  Shares 305,420 309,363
MDAMERICAN ENR 6.125% 4/01/36 156,000  Shares 188,308 209,171
MILLICOM 5.125% 1/15/28 144A 80,000  Shares 80,563 80,000
MORGAN STANLEY 4% 07/23/25 205,000  Shares 216,309 214,594
MORGAN STANLEY 5.5% 7/28/21 195,000  Shares 222,984 213,277
MORGAN STANLEY 3.95% 04/23/27 615,000  Shares 604,635 624,342
NABORS IND 5.5% 01/15/23 170,000  Shares 169,740 164,900
NBCUNIVERSAL MEDIA 2.875% 1/23 175,000  Shares 180,623 176,750
NBCUNIVERSAL ME 4.45% 1/15/43 105,000  Shares 104,285 114,479
NORDEA BANK AB 6.125 PERP 144A 200,000  Shares 205,960 215,300
NORTHERN TR CRP 3.95% 10/30/25 200,000  Shares 214,477 211,825
NOVA CHEMICALS 5.25% 8/23 144A 105,000  Shares 108,413 108,019
O REILLY AUTOMO 4.875% 1/14/21 205,000  Shares 221,152 217,675
OCCIDENTAL PETE 3.4% 4/15/26 180,000  Shares 183,855 184,294
1011778 BC 5% 10/15/25 144A 45,000  Shares 45,000 45,338
OWENS CORNING 4.2% 12/15/22 200,000  Shares 205,808 209,683
PNC FIN SERVICES 3.15% 5/19/27 215,000  Shares 216,160 215,672
PETRO-CANADA 6.8% 5/15/38 105,000  Shares 136,072 144,614
PEMEX 5.375% 03/13/22 144A 130,000  Shares 129,280 137,800
PIEDMONT OPERTG 4.45% 03/15/24 120,000  Shares 123,422 124,875
PRINCIPAL FN GR 4.75%/VAR 5/55 245,000  Shares 247,247 250,880
PRUDENTIAL FN 5.2%/VAR 3/15/44 210,000  Shares 213,631 223,650
QUALCOMM INC 2.1% 05/20/20 140,000  Shares 140,179 139,402
QUEST DIAGNOSTI 4.25% 04/01/24 200,000  Shares 210,871 211,427
QWEST CORP 6.75% 12/01/21 285,000  Shares 317,854 306,911
ROCKWELL COLLINS 3.5% 03/15/27 305,000  Shares 306,874 310,457
ROYAL BK SC 6.1% 6/10/23 105,000  Shares 113,881 115,606
SES 3.6% 04/04/23 144A 95,000  Shares 97,425 95,200
SABINE PASS LQ 5.875% 06/30/26 80,000  Shares 89,600 89,856
SCHWAB CHARLES 2.65% 01/25/23 375,000  Shares 374,400 374,717
SIEMENS FINA 3.4% 3/16/27 144A 250,000  Shares 248,283 254,673
SMITHFIELD FD 4.25% 2/27 144A 190,000  Shares 193,231 194,977
STATE STREET 5.25% VAR PERP 120,000  Shares 126,500 125,856
SUNOCO LOGISTICS 4% 10/01/27 150,000  Shares 148,824 147,039
SUNTRUST BANK 2.45% 8/01/22 310,000  Shares 310,254 305,635

8

Table of Contents

Ameren Corporation Savings Investment Plan

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

December 31, 2017

Name of plan sponsor: Ameren Corporation

Employer identification number: 43-1723446

Three-digit plan number: 003

(a) (c) Description of investment including maturity date, rate of interest, collateral, par, or maturity value (d) Cost (e) Current value
SUNTRUST BANKS 5.05%/VAR PERP 185,000  Shares 185,774 187,313
SYMETRA 4.25% 07/15/24 105,000  Shares 106,882 106,586
SYSCO CORP 3.3% 07/15/2026 195,000  Shares 195,267 196,171
TARGA RES LP/FI 4.25% 11/15/23 60,000  Shares 57,825 59,325
TELEFONICA EMISION 4.103% 3/27 300,000  Shares 306,716 309,903
TEVA PHARM NE 3.15% 10/01/26 140,000  Shares 139,628 115,559
TEXAS INSTRUMENTS 2.9% 11/27 190,000  Shares 187,802 189,313
TIME WARNER INC 3.875% 1/15/26 170,000  Shares 170,849 171,579
TYSON FOODS INC 3.95% 08/15/24 160,000  Shares 163,694 168,233
UNITED HEALTH 4.75% 7/15/45 150,000  Shares 157,040 177,020
UNUM GROUP 4% 03/15/24 175,000  Shares 182,593 182,197
VALEANT PHARM 5.5% 11/25 144A 110,000  Shares 111,238 111,925
VERIZON COMM 4.125% 8/15/46 165,000  Shares 157,465 152,290
VOYA FIN INC 3.65% 6/15/26 120,000  Shares 119,650 121,324
WELLS FARGO MTN 4.6% 4/01/21 345,000  Shares 373,173 366,599
WESTERN DIGI 7.375% 4/23 144A 125,000  Shares 130,709 134,844
WESTPAC BKG NZ 5%/VAR PERP 195,000  Shares 194,999 194,418
WILLIS NORTH AMER 3.6% 5/15/24 110,000  Shares 109,904 111,802
WOODSIDE FIN 3.65% 3/5/25 144A 140,000  Shares 135,663 140,817
XLIT LTD 4.45% 03/31/2025 220,000  Shares 218,954 224,965
SPRINT SPECTRM 3.36% 3/23 144A 200,000  Shares 199,996 201,249
Total Corporate debt securities 28,869,174 29,168,729
Other Debt Securities
REP HONDURAS 8.75% 12/20 144A 200,000  Shares 225,000 224,090
GERMANY GOVT 0.25% 2/15/27 RGS 430,000  Shares 476,991 510,751
EGYPT REP 6.125% 1/31/22 144A 200,000  Shares 208,250 209,210
SRI LANKA GVT 6.125% 6/25 144A 200,000  Shares 210,250 211,410
MUNICIPAL ELE GA 7.055% 4/1/57 100,000  Shares 108,838 123,238
ALLYA 2017-3 A4 2.01% 03/22 325,000  Shares 324,984 322,770
AMERICAN AIR 5.6% 01/15/22 91,968  Shares 96,357 95,040
AMERICAN AIR_L 3.575% 07/15/29 161,771  Shares 164,400 164,699
AMXCA 2017-1 A 1.93% 09/22 340,000  Shares 340,375 338,434
BACCT 2017-A1 A1 1.95% 08/22 320,000  Shares 319,908 318,569
BACM 2015-UBS7 D 3.167% 9/48 160,000  Shares 117,675 131,125
BANK 2017-BNK4 A4 3.625% 05/50 280,000  Shares 289,432 291,214
BAYV 2006-D 1A3 5.932% 12/36 82,572  Shares 81,953 83,653
CD 2017-CD5 A4 3.431% 08/50 200,000  Shares 208,328 205,118
CWALT 2003-J3 1A3 5.25% 11/33 104,161  Shares 105,398 105,248
COMET 2016-A4 A4 1.33% 6/15/22 540,000  Shares 531,816 533,295
CCCIT 2014-A1 A1 2.88% 01/23 375,000  Shares 383,921 381,734
CCCIT 2014-A6 A6 2.15% 07/21 305,000  Shares 307,633 305,316
CCCIT 2017-A8 A8 1.88% 8/8/22 275,000  Shares 274,968 272,425
COLD 2017-ICE3 A 1ML+1 4/36 310,000  Shares 310,969 310,768
CAH 14-1A B 1ML+135 05/31 350,000  Shares 338,297 350,812
CSH 16-1A D 1193476+3.1% 07/33 145,000  Shares 145,000 148,582
COMM 2016-STAV B 0% 10/34 144A 210,000  Shares 210,000 210,520
DNKN 15-1A A2II 3.98% 02/45 14 301,475  Shares 309,701 307,719
DCENT 2012-A6 A6 1.67% 01/22 475,000  Shares 474,499 472,312
DCENT 2015-A2 A 1.9% 10/22 115,000  Shares 114,645 114,320
DCENT 2017-A2 A2 2.39% 07/24 185,000  Shares 184,913 184,971
DPABS 17-1A A2II 3.082% 07/47 224,438  Shares 224,438 221,973
FITAT 2017-1 A3 2.03% 02/22 310,000  Shares 309,992 307,756
FSMT 2017-2 A5 3.50% 10/47 238,066  Shares 241,637 240,586
FORDR 14-1 A 2.26% 11/25 300,000  Shares 302,391 300,610

9

Table of Contents

Ameren Corporation Savings Investment Plan

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

December 31, 2017

Name of plan sponsor: Ameren Corporation

Employer identification number: 43-1723446

Three-digit plan number: 003

(a) (b) Identity of issue, borrower, lessor, or similar party (c) Description of investment including maturity date, rate of interest, collateral, par, or maturity value (d) Cost (e) Current value
GPPT 2014-GPP A 1ML+120 02/27 112,497  Shares 112,568 112,510
GSMS 2015-GC32 D 3.345% 07/48 145,000  Shares 105,601 119,974
IHSFR 15-SFR1 A 1ML+140 03/32 203,618  Shares 204,763 204,061
IHSFR 17-SFR2 A 1ML+85 12/36 144,394  Shares 144,394 144,858
JPMBB 13-C12 A5 3.6637% 07/45 485,000  Shares 511,978 506,323
JPMCC 17-JP5 A5 3.7232% 03/50 260,000  Shares 266,703 272,339
JPMCC 17-MAUI A 1ML+83 07/34 255,000  Shares 255,000 255,161
MSBAM 15-C22 D 4.24368% 05/46 140,000  Shares 111,464 120,745
MSBAM 14-C16 D CSTR 06/47 165,000  Shares 135,294 145,419
NRART 16-T1 DT1 4.3768% 06/49 110,000  Shares 110,000 110,129
NRART 17-T1 DT1 4.0024% 02/51 185,000  Shares 184,999 185,413
NRZT 2017-6A A1 4% 08/57 255,693  Shares 264,319 262,436
NAROT 2016-A A3 1.34% 10/15/20 300,000  Shares 299,379 298,626
OMART 2016-T2 DT2 4.45% 08/49 225,000  Shares 225,000 224,978
SEMT 17-CH2 A10 4% 12/47 305,476  Shares 312,376 311,019
SCOT 2017-2 A4 3.5% 10/47 144A 332,162  Shares 340,882 340,633
SWH 17-1 A 1ML+95 01/35 244,108  Shares 244,108 245,088
BELL 16-1A A2II 4.377% 05/46 1 123,438  Shares 129,783 127,341
TAH 17-SFR1 A 2.716% 09/34 180,000  Shares 179,995 177,772
WFRBS 2012-C10 A3 2.875% 12/45 250,000  Shares 252,822 250,945
WFCM 2015-C29 A4 3.637% 06/48 300,000  Shares 306,633 311,771
WFCM 2015-C30 D VAR 09/58 144A 115,000  Shares 92,746 103,364
WFCM 2016-C32 A4 3.56% 01/59 295,000  Shares 307,376 304,761
WOART 16-B A3 1.3% 2/22 160,000  Shares 158,400 158,437
US 10YR NOTE (CBT)MAR18 TYH8 3  Shares — 1,875
US LONG BOND(CBT) MAR18 USH8 1  Shares — 281
US ULTRA BOND CBT MAR18 WNH8 9  Shares — 4,398
US 5YR NOTE(CBT)FUT MAR18 FVH8 2  Shares — 188
CITI CDX 29 BP FIX 12/22 ICE —   Shares — (639)
Total Other Debt Securities 13,199,542 13,298,474
Notes Receivable
* / ** Participants Participant Loans 33,826,437 33,826,437
$  1,953,261,644 $  2,418,446,311
  • Investment represents allowable transaction with a party-in-interest.

** Interest rates vary from 4.00% to 10.50% on loans maturing through 2028.

10

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 | |
| --- | --- |
| By: 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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