UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d)

of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): March 27, 2014

DIGITAL REALTY TRUST, INC.

DIGITAL REALTY TRUST, L.P.

(Exact name of registrant as specified in its charter)

(415) 738-6500

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

On March 27, 2014 Digital Stout Holding, LLC, a wholly-owned subsidiary of Digital Realty Trust, L.P., priced an offering of £300 million aggregate principal amount of its 4.750% Guaranteed Notes due 2023, which we refer to as the Notes. The Notes will be senior unsecured obligations of Digital Stout Holding, LLC and will be fully and unconditionally guaranteed by Digital Realty Trust, Inc. and Digital Realty Trust, L.P. The Notes are being sold only outside the United States in reliance on Regulation S under the Securities Act of 1933, as amended, or the Securities Act. Consummation of the offering is subject to market and other conditions. The Notes have not been and will not be registered under the Securities Act and may not be offered or sold within the United States or to United States persons (within the meaning of Regulation S under the Securities Act) absent registration or an applicable exemption from registration requirements. Interest on the Notes will be paid in cash semi-annually in arrears at a rate of 4.750% per annum. The Notes will mature in October 2023. The Notes will be issued pursuant to an indenture between Digital Stout Holding, LLC, Digital Realty Trust, Inc., Digital Realty Trust, L.P., Deutsche Trustee Company Limited, as trustee, Deutsche Bank AG, London Branch, as paying agent and a transfer agent, and Deutsche Bank Luxembourg S.A., as registrar and a transfer agent, setting forth the terms of the Notes. Settlement for the offering is expected to occur on April 1, 2014, subject to the execution of a subscription agreement for the Notes and the satisfaction of customary closing conditions. We intend to use the net proceeds from the offering of the Notes to temporarily repay borrowings under our global revolving credit facility, to acquire additional properties, to fund development opportunities, for general working capital purposes or a combination of the foregoing.

Forward-Looking Statements

This current report on Form 8-K contains forward-looking statements which are based on current expectations, forecasts and assumptions that involve risks and uncertainties that could cause actual outcomes and results to differ materially from those expressed or implied by such statements, including statements related to the timing and consummation of the offering of the Notes and the intended use of the net proceeds from the offering. These risks and uncertainties include, among others, the following: the impact of current global economic, credit and market conditions; current local economic conditions in our geographic markets; decreases in information technology spending, including as a result of economic slowdowns or recession; adverse economic or real estate developments in our industry or the industry sectors that we sell to (including risks relating to decreasing real estate valuations and impairment charges); our dependence upon significant tenants; bankruptcy or insolvency of a major tenant or a significant number of smaller tenants; defaults on or non-renewal of leases by tenants; our failure to obtain necessary debt and equity financing; risks associated with using debt to fund our business activities, including re-financing and interest rate risks, our failure to repay debt when due, adverse changes in our credit ratings or our breach of covenants or other terms contained in our loan facilities and agreements; financial market fluctuations; changes in foreign currency exchange rates; our inability to manage our growth effectively; difficulty acquiring or operating properties in foreign jurisdictions; our failure to successfully integrate and operate acquired or developed properties or businesses; the suitability of our properties and data center infrastructure, delays or disruptions in connectivity, failure of our physical infrastructure or services or availability of power; risks related to joint venture investments, including as a result of our lack of control of such investments; delays or unexpected costs in development of properties; decreased rental rates, increased operating costs or increased vacancy rates; increased competition or available supply of data center space; our inability to successfully develop and lease new properties and development space; difficulties in identifying properties to acquire and completing acquisitions; our inability to acquire off-market properties; our inability to comply with the rules and regulations applicable to reporting companies; our failure to maintain our status as a REIT for federal income tax purposes; possible adverse changes to tax laws; restrictions on our ability to engage in certain business activities; environmental uncertainties and risks related to natural disasters; losses in excess of our insurance coverage; changes in foreign laws and regulations, including those related to taxation and real estate ownership and operation; and changes in local, state and federal regulatory requirements, including changes in real estate and zoning laws and increases in real property tax rates. We cannot assure you that we will be able to complete the offering on the anticipated terms, or at all. For a further list and description of such risks and uncertainties, see the reports and other filings by Digital Realty Trust, Inc. and Digital Realty Trust, L.P. with the U.S. Securities and Exchange Commission, including our combined Annual Report on Form 10-K, as amended, for the year ended December 31, 2013. We disclaim any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrants have duly caused this report to be signed on their behalf by the undersigned hereunto duly authorized.

Date: March 27, 2014