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): April 28, 2014

DIGITAL REALTY TRUST, INC.

(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 and effective as of April 29, 2014, the Board of Directors of Digital Realty Trust, Inc. (the “company”, “we” or “our”) adopted the Fifth Amended and Restated Bylaws to add a forum selection provision and make ministerial changes. The forum selection provision generally provides that unless the company consents in writing to the selection of an alternative forum, the Circuit Court for Baltimore City, Maryland, or, if that Court does not have jurisdiction, the United States District Court for the District of Maryland, Baltimore Division, shall be the sole and exclusive forum for (a) any derivative action or proceeding brought on behalf of the company, (b) any action asserting a claim of breach of any duty owed by any director or officer or other employee of the company to the company or to the stockholders of the company, (c) any action asserting a claim against the company or any director or officer or other employee of the company arising pursuant to any provision of the Maryland General Corporation Law or the company’s charter or bylaws, or (d) any action asserting a claim against the company or any director or officer or other employee of the company that is governed by the internal affairs doctrine.

The foregoing summary is qualified in its entirety by reference to the full text of the Fifth Amended and Restated Bylaws, a copy of which is attached as Exhibit 3.1 hereto and incorporated herein by reference.

On April 28, 2014, we held our Annual Meeting of Stockholders, at which the stockholders voted on proposals as follows:

Proposal 1. Election of directors, each to serve until the 2015 Annual Meeting of Stockholders and until a successor for each has been duly elected and qualifies.

Proposal 2. Ratification of the selection of KPMG LLP as our independent registered public accounting firm for the year ending December 31, 2014.

Proposal 3. Approval of the Digital Realty Trust, Inc., Digital Services, Inc. and Digital Realty Trust, L.P. 2014 Incentive Award Plan.

Proposal 4. Resolution to approve, on a non-binding, advisory basis, the compensation of our named executive officers.

(d) Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: May 2, 2014

EXHIBIT INDEX