Updating Summary Prospectus (Form 497VPU)

STATE UNIVERSITY OF NEW YORK

DEFINED CONTRIBUTION RETIREMENT PLANS

GROUP DEFERRED FIXED AND VARIABLE ANNUITY CONTRACTS

issued by

Voya Retirement Insurance and Annuity Company
and its
Variable Annuity Account C

Supplement Dated December 19, 2025 to the

Contract Prospectus and Updating Summary Prospectus,
each dated May 1, 2025, as amended

This supplement to the variable annuity account contract prospectus ("contract prospectus") and updating summary prospectus ("summary prospectus"), updates and amends certain information contained in them. Please read this supplement carefully and keep it with the contract prospectus and summary prospectus that you may have received, for future reference. Capitalized terms not defined in this supplement shall have the meaning given to them in the contract prospectus and summary prospectus.

NOTICE OF IMPORTANT INFORMATION ABOUT

UPCOMING FUND CHANGES

On November 13, 2025, the Board of Trustees of the Voya Global Insights Portfolio (the "Portfolio") approved a number of changes to the structure of the Portfolio that would permit the Portfolio to be sold directly to the public (the "Conversion"). Currently, the purchase and sale of shares of the Portfolio may be made only by separate accounts of insurance companies serving as investment options under variable contracts or by qualified pension or retirement plans, custodian accounts, and certain investment advisers and their affiliates, other investment companies, or permitted investors. Following the Conversion, the eligibility to invest in the Portfolio will be revised and the Portfolio will be offered directly to the public. It is expected that these changes will take effect on or about July 17, 2026 (the "Effective Date").

No insurance company separate accounts will be invested in the Portfolio at the time of the Conversion.

Qualified pension and retirement plans will remain eligible to invest in the Portfolio.

There will be no changes to the investment objective, investment strategy or investment risks of the Portfolio as a result of this Conversion.

To facilitate this Conversion, on or about the Effective Date the following changes will occur:

* * * *

MORE INFORMATION IS AVAILABLE

More information about the funds available through your contract, including information about the risks associated with investing in them can be found in the contract prospectus, summary prospectus, and Statement of Additional Information for each fund. You may obtain these documents by contacting Customer Service:

If you received a summary prospectus for any of the funds available through your contract, you may obtain a full contract prospectus and other fund information free of charge by either accessing the internet address, calling the telephone number, or sending an email request to the email address shown on the front of the fund's summary prospectus.

Please retain this supplement for future reference.

Insurance products, annuities and retirement plan funding issued by (third party administrative services may also be provided by) Voya Retirement Insurance and Annuity Company, One Orange Way, Windsor, CT 06095. Securities are distributed by Voya Financial Partners, LLC (member SIPC). Securities may also be distributed through other broker-dealers with which Voya Financial Partners, LLC has selling agreements.