Prospectus Supplement (To Prospectus dated February17, 2026) Regency Centers CorporationDividend Reinvestment and Stock Purchase Plan 100,000 Shares of Common Stock Regency Centers Corporation is pleased to offer the opportunity to participate in the Regency Centers Corporation Dividend Reinvestment andStock Purchase Plan described in this prospectus supplement (the “Plan”). The Plan provides a convenient and economical way for existing shareholdersto purchase shares of our common stock, $0.01 par value (our “Common Stock”), and to reinvest cash dividends in additional shares of our CommonStock. This prospectus supplement relates to up to 100,000 shares of Common Stock to be offered for purchase under the Plan. As described in more detail in this prospectus supplement, the Plan offers several benefits to its participants (“participants,” “you,” or “your”),including: •Limited Costs to Buy or Sell Shares.The Plan allows you to purchase shares of our Common Stock in a convenient manner withoutincurring transaction/processing fees; however, you will be required to pay nominal brokerage/administrative fees for sales of shares underthe Plan.•Build Investment Over Time.You can build your investment over time. Investments may not exceed $10,000 per quarter.•Convenient Reinvestment of Dividends.Holders of our Common Stock can increase their holdings in Regency by reinvesting all orsome of the cash dividends paid on their Common Stock in additional shares of Common Stock without incurring transaction/processingfees.•Convenient Payment Options.You can invest through automatic withdrawals from your bank account.•Cost Free Maintenance and Recordkeeping.Participants receive cost-free maintenance of shares in book-entry form and detailedrecordkeeping and reporting under the Plan. The Plan is administered by the Company’s transfer agent, Broadridge Corporate Issuer Solutions, LLC (“Broadridge”) at the expense of Regency. Our Common Stock is traded on the Nasdaq Stock Market LLC (“Nasdaq”) under the ticker symbol “REG.” On April9, 2026, the last reportedsale price of our Common Stock was $78.35. Shares of Common Stock offered under the Plan to persons or entities who are not current shareholders ofRegency are offered through a registered broker/dealer. Please read this prospectus supplement carefully and keep it for future reference. If you have any questions about the Plan, please contact the PlanAdministrator for Regency (the “Plan Administrator”) through the methods described under the heading “Description of the Plan—Who Administers thePlan for Participants.” Investing in our Common Stock involves risks. See “Risk Factors” in this prospectus supplement and in our latestannual report on Form 10-K. Neither the Securities and Exchange Commission (“SEC”) nor any state securities commission has approved or disapproved of our CommonStock or determined if this prospectus supplement is truthful or complete. Any representation to the contrary is a criminal offense. TABLE OF CONTENTS ABOUT THIS PROSPECTUS SUPPLEMENTWHERE YOU CAN FIND MORE INFORMATIONINCORPORATION BY REFERENCECAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTSOUR COMPANYRISK FACTORSDESCRIPTION OF THE PLANUSE OF PROCEEDSPLAN OF DISTRIBUTIONSUPPLEMENTAL UNITED STATES FEDERAL INCOME TAX CONSIDERATIONSLEGAL MATTERSEXPERTS ABOUT THIS PROSPECTUSFORWARD-LOOKING INFORMATIONRISK FACTORSREGENCY CENTERS CORPORATION AND REGENCY CENTERS, L.P.WHERE YOU CAN FIND MORE INFORMATIONINCORPORATION OF CERTAIN DOCUMENTS BY REFERENCEUSE OF PROCEEDSGENERAL DESCRIPTION OF SECURITIESDESCRIPTION OF THE SECURITIES THAT MAY BE OFFERED BY REGENCY CENTERS, L.P.DESCRIPTION OF THE SECURITIES THAT MAY BE OFFERED BY REGENCY CENTERS CORPORATION SELLING SECURITY HOLDERS PLAN OF DISTRIBUTION FEDERAL INCOME TAX CONSIDERATIONS LEGAL MATTERS EXPERTS Prospectus You should rely only on the information contained or incorporated by reference in this prospectus supplement, the accompanying prospectus orany applicable free writing prospectus filed by us with the Securities and Exchange Commission (the “SEC”). We have not authorized any other personto provide you with different information with respect to this offering of Common Stock. You should only assume that the information in this prospectussupplement and the accompanying prospectus is accurate as of the date on the front of those documents. Our business, financial condition, results ofoperations and prospects may have changed since that date. This document may only be used where it is legal to sell Common Stock. We are not makingan offer of Common Stock in any state where the offer is not permitted. ABOUT THIS PROSPECTUS SUPPLEMENT This document is in two parts. The first part is this prospectus supplement, including the documents incorporated by reference, which describesthe specific terms of this offering. The second part, the accompanying prospectus dated February17, 2026, gives more general information, some ofwhich may n