数字房地产信托公司美股招股说明书(2026-07-01版)

Common Stock The selling stockholders identified in this prospectus supplement are selling 12,310,249 shares of our common stock, $0.01 par value per share(“common stock”), in this offering. We are not selling any shares of common stock under this prospectus supplement and will not receive any proceedsfrom the sale of shares by the selling stockholders. See “Use of Proceeds.” We are organized and conduct our operations to qualify as a real estate investment trust (“REIT”), for U.S. federal income tax purposes. To assist us incomplying with certain federal income tax requirements applicable to REITs, our charter contains certain restrictions relating to the ownership andtransfer of our stock, including an ownership limit of 9.8% (by value or by number of shares, whichever is more restrictive) on the outstanding shares ofour common stock. Our common stock is listed on the New York Stock Exchange under the symbol “DLR”. The last reported sale price of our common stock on the NewYork Stock Exchange on June29, 2026 was $190.58 per share. Investing in our common stock involves risks. See “RiskFactors” beginning on pageS-5 of this prospectus supplementand the matters discussed in the documents incorporated by reference in this prospectus supplement and theaccompanying prospectus. Neither the U.S. Securities and Exchange Commission (the “SEC”) nor any state securities commission, nor any other regulatory body hasapproved or disapproved of these securities or passed on the adequacy or accuracy of this prospectus supplement and the prospectus to which itrelates. Any representation to the contrary is a criminal offense. (1)Please see the section entitled “Underwriting” for a description of the compensation payable to the underwriter. The underwriter expects to deliver the shares to purchasers on or about July1, 2026 through the book-entry facilities of The Depository Trust Company. Morgan Stanley The date of this prospectus supplement is June29, 2026. Table of Contents TABLE OF CONTENTS Prospectus Supplement About This Prospectus Supplement and the ProspectusForward-Looking StatementsProspectus Supplement SummaryThe OfferingRisk FactorsUse of ProceedsSelling StockholdersUnderwritingLegal MattersExpertsWhere You Can Find More InformationIncorporation By Reference Prospectus About This ProspectusOur CompanyRisk FactorsWhere You Can Find More InformationIncorporation of Certain Documents by ReferenceUse of ProceedsDescription of Common StockDescription of Preferred StockDescription of Depositary SharesDescription of WarrantsDescription of Debt Securities and Related GuaranteesRestrictions on Ownership and TransferDescription of the Partnership Agreement of Digital Realty Trust, L.P.Material Provisions of Maryland Law and of the Charter and Bylaws of Digital Realty Trust, Inc.United States Federal Income Tax ConsiderationsSelling SecurityholdersPlan of DistributionLegal MattersExperts You should rely only on the information contained in or incorporated by reference into this prospectus supplement, the accompanyingprospectus or any applicable free writing prospectus in making a decision about whether to invest in our common stock. We, the sellingstockholders and the underwriter have not authorized any other person to provide you with different or additional information. If anyoneprovides you with different or additional information, you should not rely on it. The distribution of this prospectus supplement and theaccompanying prospectus and the offering of the common stock in certain jurisdictions may be restricted by law. If you possess this prospectussupplement and the accompanying prospectus, you should find out about and observe these restrictions. This prospectus supplement and theaccompanying prospectus do not constitute an offer to sell, or a solicitation of an offer to purchase, any securities in any jurisdiction where it isunlawful to make such offer or solicitation or where the person making the offer or sale is not qualified to do so or to any person to whom it isnot permitted to make such Table of Contents offer or sale. You should assume that the information appearing in this prospectus supplement, the accompanying prospectus, any applicablefree writing prospectus and the documents incorporated by reference herein or therein is accurate only as of their respective dates or on thedate or dates which are specified in these documents. Our business, financial condition, liquidity, results of operations and prospects may havechanged since those dates. The description set forth in this prospectus supplement replaces and supplements, where inconsistent, thedescription of the general terms and provisions set forth in the accompanying prospectus. Table of Contents ABOUT THIS PROSPECTUS SUPPLEMENT AND THE PROSPECTUS This document is in two parts. The first part is this prospectus supplement, which describes the specific terms of this offering and also adds to, changesand updates information contained