Exhibit 27(o)

VOYA RETIREMENT INSURANCE AND ANNUITY COMPANY

STATE UNVERSITY OF NEW YORK

DEFINED CONTRIBUTION RETIREMENT PLANS

GROUP DEFERRED FIXED AND VARIABLE ANNUITY CONTRACTS

(THE “CONTRACT” OR “CONTRACTS”)

issued to

SUNY ORP (Post 11/15/2021) Plans

SUMMARY PROSPECTUS FOR NEW INVESTORS

May 1, 2026

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This summary prospectus summarizes key features of the Contract.

Before you participate in the Contract through your retirement plan, you should also review the full prospectus for the Contract (the “full Contract Prospectus”). It contains more information about the Contract’s features, benefits and risks. You can find this document and other information about the contract online at https://vpx.broadridge.com/getcontract1.asp?dtype=isp&cid=voyavpx&fid=NRVA00974. You can also obtain this information at no cost by calling Customer Service at 1-800-584-6001 or by sending an email request to ProspectusRequests@voya.com.

The Contract is a complex investment and involves risks, including potential loss of principal. The Contract is not a short-term investment and is not appropriate for an investor who needs ready access to cash. Withdrawals could result in surrender charges, taxes, and tax penalties.

Our obligations under the Contract are subject to our financial strength and claims-paying ability.

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An Investor may cancel the Contract within 10 days of receiving it

without paying fees or penalties.

In some states, this cancellation period may be longer. Upon cancellation, you will receive a full refund of the amount you paid with your application, plus any earnings or less any losses attributable to amounts invested in the Variable Investment Options. You should review this summary prospectus, or consult with your investment professional, for additional information about the specific cancellation terms that apply.

Upon cancellation, you will receive a full refund of the amount you paid with your application, plus any earnings or less any losses attributable to amounts invested in the Investment Options. You should review this summary prospectus, or consult with your investment professional, for additional information about the specific cancellation terms that apply.

Additional information about certain investment products, including variable annuities, has been prepared by the Securities and Exchange Commission’s staff and is available at Investor.gov.

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The U.S. Securities and Exchange Commission (the “SEC”) has not approved or disapproved this Contract or passed upon the adequacy of this summary prospectus. Any representation to the contrary is a criminal offense.

SPECIAL TERMS USED IN THIS SUMMARY PROSPECTUS

The following are some of the important terms used throughout this summary prospectus that have special meaning. There are other capitalized terms that are explained or defined in other parts of this summary prospectus.

Account Value: The value of: (1) amounts allocated to the Fixed Interest Options, including interest earnings to date; less (2) any deductions from the Fixed Interest Options (e.g., withdrawals and fees); and plus (3) the current dollar value of amounts allocated to the Subaccounts of Variable Annuity Account C, which includes investment performance and fees deducted from the Subaccounts.

Accumulation Phase: The period of time between the date the Contract became effective and the date you begin receiving Income Phase payments under the Contract. During the Accumulation Phase, you accumulate retirement benefits.

Accumulation Unit: A unit of measurement used to calculate the Account Value during the Accumulation Phase.

Accumulation Unit Value: The value of an Accumulation Unit for a Subaccount of Variable Annuity Account C. Each Subaccount of Variable Annuity Account C has its own Accumulation Unit Value, which may increase or decrease daily based on the investment performance of the applicable underlying Fund in which it invests.

Beneficiary (or Beneficiaries): The person designated to receive the death benefit payable under the Contract.

Contract or Contracts: The flexible premium, group, deferred combination variable and fixed annuity Contracts offered by your Plan Sponsor as a funding vehicle for your retirement plan.

Contract Holder: The person to whom we issue the Contract. Generally, the Plan Sponsor or a trust.

Customer Service: The location from which we service the Contracts. The mailing address and telephone number of Customer Service is Defined Contributions Administration, P.O. Box 990063, Hartford, CT 06199-0063, 1-800-584-6001.

Fixed Interest Options: The Fixed Plus Account II A is a Fixed Interest Option that may be available during the Accumulation Phase under some Contracts. Amounts allocated to the Fixed Interest Option are held in the Company’s General Account which supports insurance and annuity obligations.

Fund(s): The underlying mutual Funds in which the Subaccounts invest.

General Account: The account that contains all of our assets other than those held in Variable Annuity Account C or one of our other separate accounts.

Good Order: Generally, a request is considered to be in “Good Order” when it is signed, dated, and made with such clarity and completeness that we are not required to exercise any discretion in carrying it out. We can only act upon written requests that are received in Good Order.

Income Phase: The period during which you receive payments from your Contract.

Investor (also “you” or “participant”): The individual who participates in the Contract through a retirement plan.

Loan Interest Rate Spread: The difference between the rate charged and the rate credited on loans under your Contract.

Plan Sponsor: The sponsor of your retirement plan. Generally, your employer.

Purchase Payment: Collectively, the initial purchase payment and any additional purchase payment.

Subaccount: Division(s) of Variable Annuity Account C that are investment options under the Contract. Each Subaccount invests in a corresponding underlying mutual Fund.

Tax Code: The Internal Revenue Code of 1986, as amended.

VRIAC, the Company, we, us and our: Voya Retirement Insurance and Annuity Company, a stock company domiciled in Connecticut, that issues the Contract described in this summary prospectus.

Variable Annuity Account C, the Separate Account: Voya Variable Annuity Account C, a segregated asset account established by us to fund the variable benefits provided by the Contract. The Variable Annuity Account C is registered as a unit investment trust under the Investment Company Act of 1940, as amended, and it also meets the definition of “separate account” under the federal securities laws.

Variable Investment Options: The Subaccounts of Variable Annuity Account C. Each one invests in a specific mutual Fund.

Vested: The amount of money in a participant’s individual account attributable to participant contributions. In an employer-sponsored retirement plan (i.e., a 403(b) plan), the Vested amount may include employer matching contributions.

OVERVIEW OF THE CONTRACT

This summary provides a brief overview of the more significant aspects of the Contract. Further detail is provided in this summary prospectus, the Contract and the summary or full prospectuses for the Funds being considered. We urge you to read the entire summary prospectus as it describes all material features and benefits of the Contract and your rights and limitations thereunder. It also sets forth information you should know before making the decision to participate in the Contract through your retirement plan.

Certain features and benefits may vary depending on the state in which your Contract is issued, and any such material state variations are disclosed in the discussion of the features and benefits in the prospectus. Variations in contract benefits or features described in this prospectus may be imposed without our knowledge by some financial institutions or broker-dealers through which the Contract was sold. For more information, see “OTHER TOPICS – Financial Intermediary Variations” section of the full Contract Prospectus. If you have any questions about any limitations, restrictions, or other variations related to the Portfolios, contract benefits or other contract features available to you, please reach out to your financial institution or broker-dealer.

Purpose

The contracts described in this prospectus are group deferred fixed and variable annuity contracts. The Contracts may be single Purchase Payment contracts or Contracts that permit installment Purchase Payments. It is intended to be used as a funding vehicle for certain types of retirement plans, including those that qualify for beneficial tax treatment and/or to provide current income reduction under Tax Code Sections 401(a), 403(b), including Roth 403(b), if available and 414(h).

The Contract is designed for Investors who intend to accumulate funds for retirement purposes, and thus is best suited for those with a long investment horizon. The Contract should not be viewed as a highly liquid investment. In that regard, early withdrawals may be restricted by the Tax Code or your plan and may expose you to early withdrawal charges or tax penalties. The value of deferred taxation on earnings grows with the amount of time your money is left in the Contract. For these reasons, you should not participate in this Contract if you are looking for a short-term investment. When considering whether to purchase or participate in the Contract, you should consult with your financial representative about your financial goals, investment time horizon and risk tolerance.

Phases of Contract

The Contract has two phases: An Accumulation Phase and an Income Phase.

Accumulation Phase: During the Accumulation Phase, you direct us to invest your Purchase Payments or Account Value among the follow investment options:

Withdrawals will not be allowed during the Income Phase. See “THE INCOME PHASE” in the full Contract Prospectus.

The Variable Investment Options: The Variable Investment Options are Subaccounts within the Separate Account. Each Subaccount invests its assets directly in shares of a corresponding underlying Fund, and each Fund has its own distinct investment objectives, fees and expenses and investment advisers. Earnings on amounts invested in a Subaccount will vary depending upon the performance and fees of the corresponding underlying Fund. You do not invest directly in or hold shares of the Funds.

There is no guarantee that your Account Value will increase. Depending upon the investment experience of each Fund in which a Subaccount invests, your Account Value may increase or decrease daily. You bear the investment risk for the Funds in which the Subaccounts invest; you will benefit from favorable investment experience but also bear the risk of poor investment performance.

The Fixed Interest Options: The Fixed Plus Account II A may be available through the Contract.

Additional information about the Variable Investment Options and Fixed Interest Options is provided in an appendix to the prospectus. See “APPENDIX A: INVESTMENT OPTIONS AVAILABLE UNDER THE CONTRACT.”

Income Phase: During the Income Phase, you start receiving annuity, or Income Phase, payments from your Contract. However, during the Income Phase you will be unable to make withdrawals, and any death benefits and living benefits will terminate. The Contract offers several Income Phase payment options. In general, you may:

Contract Features

Death Benefit. A Beneficiary may receive a death benefit in the event of your death during both the Accumulation and Income Phases (described above). If made available under your Contract, you can elect the Guaranteed Death Benefit. The availability of a death benefit during the Income Phase depends upon the Income Phase annuity payment option selected. See the “Benefits Available Under the Contract” below.

For most Contracts, the death benefit will be based on your Account Value. The death benefit is calculated as of the next time we value your account following the date on which Customer Service receives proof of death and a payment request in Good Order. In addition to this amount, some states require we pay interest on amounts invested in the Fixed Interest Option, calculated from date of death at a rate specified by state law.

Asset Rebalancing Program. Our asset rebalancing program may be available in connection with certain Contracts. Asset rebalancing allows you to reallocate your Account Value in the investments and percentages you identify. There is no additional charge for this program. See “THE CONTRACT – Contract Purchase and Limitations – The Asset Rebalancing Program” in the full Contract Prospectus.

Loans. If allowed by the Contract and the plan and subject to the terms and conditions imposed by the plan and the plan’s loan agreement, you may initiate a loan during the Accumulation Phase from your Account Value allocated to certain Subaccounts and Fixed Interest Options. There are charges associated with loans. Loans are subject to requirements under the Tax Code and related loan regulations, as well as ERISA (if applicable). Further restrictions may apply due to our administrative practices, or those administrative practices of a third-party administrator selected by your Plan Sponsor.

Systematic Distribution Options. These allow you to receive regular payments from your account, while retaining the account in the Accumulation Phase. See “SYSTEMATIC DISTRIBUTION OPTIONS” in the full Contract Prospectus.

Withdrawals. During the Accumulation Phase, you may, under some plans, withdraw all or part of your Account Value. Amounts withdrawn may be subject to other deductions, tax withholding and taxation.

Taxation. Taxes will generally be due when you receive a distribution. Tax penalties may apply in some circumstances. See “FEDERAL Tax Considerations.”

IMPORTANT INFORMATION YOU SHOULD CONSIDER ABOUT THE CONTRACT

Benefits Available Under the Contract

The following table summarizes information about the benefits available under the Contract. Some financial institutions or broker-dealers through which the Contract is sold may limit the availability of certain Contract benefits. For more information, see “OTHER TOPICS – Financial Intermediary Variations” section of the Contract Prospectus. If you have any questions about any limitations, restrictions, or other variations related to the contract benefits available to you, please reach out to your financial institution or broker-dealer.

Purchasing the Contract

To purchase the Contract:

Participating in the Contract

To participate in the Contract:

Acceptance or Rejection

We must accept or reject an application or your enrollment materials within two business days of receipt. If the forms are incomplete, we may hold any forms and accompanying Purchase Payments for five business days, unless you consent to our holding them longer. If we reject the application or enrollment forms, we will return the forms and any Purchase Payments.

Allocation of Purchase Payments

The Contract Holder or you, if the Contract Holder permits, directs us to allocate initial Purchase Payments to the investment options available under the plan. Generally, you will specify this information on your enrollment materials. After your enrollment, changes to allocations for future Purchase Payments or transfers of existing balances among investment options may be requested by telephone, electronically at www.voyaretirementplans.com or through such other means as may be available under our administrative procedures in effect from time to time. Allocations must be in whole percentages, and there may be limitations on the number of investment options that can be selected. See “THE Investment Options” in the full Contract Prospectus.

Transfer Credits

The Company provides a transfer credit in some cases on transferred assets, as defined by the Company, subject to certain conditions and state approvals. This benefit is provided on a nondiscriminatory basis. If a transfer credit is due under the Contract, you will be provided with additional information specific to the Contract.

Election of a transfer credit may impact the mortality and expense risk charge and the credited interest rate under certain Fixed Interest options. See “THE CONTRACT – Contract Provisions and Limitations – Transfer Credits” in the full Contract Prospectus.

Tax Code Restrictions

The Tax Code places some limitations on contributions to your account. See “FEDERAL Tax Considerations” in the full Contract Prospectus.

Withdrawals

Subject to limitations on withdrawals from the Fixed Interest Option and other restrictions (see “Withdrawal Restrictions” in this section), the Contract Holder, or you if permitted by the plan, may withdraw all or a portion of your Account Value at any time during the Accumulation Phase.

Steps for Making a Withdrawal

The Contract Holder, or you if permitted by the plan, must:

For amounts you withdraw from Account Value allocated to the Subaccounts, we will redeem the number of Accumulation Units needed to fund the withdrawal and reduce your Account Value accordingly. For amounts you withdraw from a Fixed Interest Option, we will reduce the value of the Fixed Interest Option by the dollar amount of that portion of the withdrawal and will reduce your Account Value accordingly. A reduction to your Account Value due to a withdrawal results in a lesser amount available to be annuitized and a lesser death benefit (if your death benefit amount is based on your Account Value). For a description of limitations on withdrawals from the Fixed Plus Account II A, please see APPENDIX F in the full Contract Prospectus.

Calculation of Your Withdrawal

We determine your Account Value every normal business day after the close of the NYSE. We pay withdrawal amounts based on your Account Value either:

Delivery of Payment

Payments for withdrawal requests will be made in accordance with SEC requirements. Normally, we will send your payment no later than seven calendar days following our receipt of your disbursement form in Good Order. No interest will accrue on amounts represented by uncashed withdrawal checks.

Withdrawal Restrictions

Many plans may have limits on withdrawals that may be made from the plan. The Contract may require that the Contract Holder certify that you are eligible for the distribution.

The Tax Code and/or your plan may impose other limitations on withdrawals. See “FEDERAL Tax Considerations – Distributions – Eligibility” in the full Contract Prospectus.

Employer Directed Withdrawals

If permitted by the plan, we may, at the Contract Holder’s direction, deduct amounts from participant accounts in order to pay costs associated with a third-party administrator engaged by the plan sponsor to administer the plan.

Systematic Distribution Options

If available under your plan, a systematic distribution option allows you to receive regular payments from your account without moving into the Income Phase. By remaining in the Accumulation Phase, you retain certain rights and investment flexibility not available during the Income Phase. Because the account remains in the Accumulation Phase, all Accumulation Phase charges continue to apply.

Systematic Distribution Options Currently Available

These options may be exercised at any time during the Accumulation Phase of the Contract. To exercise one of these options, the Account Value must meet any minimum dollar amount and age criteria applicable to that option. To determine what systematic distribution options are available, please write or call Customer Service.

Systematic distribution options currently available under the Contract include the following:

Other Systematic Distribution Options

Other systematic distribution options may be available from time to time. Additional information relating to any of the systematic distribution options may be obtained from your local representative or by contacting Customer Service.

Availability of Systematic Distribution Options

If not required under the plan, the Company may discontinue the availability of one or all of the systematic distribution options at any time and/or change the terms of future elections.

Terminating a Systematic Distribution Option

Once you elect a systematic distribution option, you may revoke it at any time by submitting a written request to Customer Service. Once revoked, an option may not be elected again until the next calendar year, nor may any other systematic distribution option be elected, unless the Tax Code permits it.

Tax Consequences

Withdrawals received through these options and revocations of elections may have tax consequences. See “FEDERAL Tax Considerations” in the full Contract Prospectus.

ADDITIONAL INFORMATION ABOUT FEES

The following tables describe the fees and expenses that you will pay when buying, owning and surrendering or making withdrawals from the Contract. Please refer to your Contract specifications page for information about the specific fees you will pay each year based on the options you have elected.

The first table describes the fees and expenses that you may pay at the time you buy the Contract, surrender or make withdrawals from the Contract or take a loan from the Contract. State premium taxes may also be deducted.

Transaction Expenses

The next table describes the fees and expenses that you will pay each year during the time that you own the Contract (not including Fund fees and expenses).

Annual Contract Expenses

The next item shows the minimum and maximum total operating expenses charged by the Funds that you may pay periodically during the time that you own the Contract. A complete list of the Funds available under the Contract, including their annual expenses, may be found in an appendix to this summary prospectus. See “APPENDIX: FUNDS AVAILABLE UNDER THE CONTRACT.”

Annual Fund Expenses

Examples

These examples are intended to help you compare the cost of investing in the Contract with the cost of investing in other variable annuity contracts. These costs include transaction expenses (assuming no loans), annual Contract expenses and annual Fund expenses.

The Example assumes all Account Value is allocated to the Variable Investment Options. Your costs could differ from those below if you invest in the Fixed Income Options.

The following example assumes that you invest $100,000 in the Variable Investment Options for the time periods indicated. The Example also assumes that your investment has a 5% return each year and assumes the most expensive combination of annual Fund expenses. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

APPENDIX: INVESTMENT OPTIONS AVAILABLE UNDER THE CONTRACT

The Variable Options and Fixed Interest Options available to you may vary based on employer. You should refer to your plan documents for a list of available Investment Options. Additionally, some financial institutions or broker-dealers through which the Contract is sold may limit the availability of certain investment options. For more information, see “OTHER TOPICS – Financial Intermediary Variations” section of this prospectus. If you have any questions about any limitations, restrictions, or other variations related to the investment options available to you, please reach out to your financial institution or broker-dealer.

Variable Options

The following is a list of Funds available under the Contract.

More information about the Funds is available in the prospectuses for the Funds, which may be amended from time to time and can be found online at https://vpx.broadridge.com/getcontract1.asp?dtype=isp&cid=voyavpx&fid=NRVA00974. You can also request this information at no cost by calling Customer Service at 1-800-584-6001 or by sending an email request to ProspectusRequests@voya.com.

The current expenses and performance information below reflects fee and expenses of the Funds, but do not reflect the other fees and expenses that your Contract may charge. Expenses would be higher, and performance would be lower if these other charges were included. Each Fund’s past performance is not necessarily an indication of future performance.

Fixed Interest Options

The following is a list of Fixed Interest Options currently available under the Contract. We may change the features of the Fixed Interest Options listed below, offer new Fixed Interest Options, and terminate existing Fixed Interest Options. We will provide you with written notice before doing so.

For more information about the Fixed Interest Options, see “THE INVESTMENT OPTIONS – Fixed Interest Options” in the full Contract Prospectus.

This summary prospectus incorporates by reference the full State University of New York Defined Contribution Retirement Plans Contract prospectus and Statement of Additional Information, each dated May 1, 2026, as amended or supplemented. You can find these documents online at https://vpx.broadridge.com/getcontract1.asp?dtype=isp&cid=voyavpx&fid=NRVA00974. You can also obtain these documents at no cost by calling Customer Service at 1-800-584-6001 or by sending an email request to ProspectusRequests@voya.com.

EDGAR Contract Identifier: C000002960