Digital Realty Trust (DLR) 8-K Digital Realty Shareholders Approve Combination with InterXion

Exhibit 99.1

Digital Realty Shareholders Approve Combination with InterXion

SAN FRANCISCO, February 28, 2020 –Digital Realty (NYSE: DLR), a leading global provider of data center, colocation and interconnection solutions, announced today its shareholders approved all proposals related to the previously announced pending combination with InterXion (NYSE: INXN), a leading provider of carrier- and cloud-neutral colocation data center services in Europe.

“We were gratified by the overwhelming shareholder support for the combination, with over 90% of votes cast by both sets of shareholders in favor of the proposals necessary to consummate the combination,” said Digital Realty Chief Executive Officer A. William Stein. “We look forward to completing the exchange offer and closing the transaction in short order. Together with InterXion, we will be even better positioned to enable customers to solve for the full spectrum of data center requirements across a global platform, and we are confident the combination of our two organizations will significantly enhance our ability to create long-term value for the customers, shareholders and employees of both companies.”

Regulatory Approval Update

Earlier this morning, Digital Realty and InterXion received approval for the transactions contemplated by the Purchase Agreement from the French Ministry of Economy and Finance, the foreign investment regulatory authority. As a result, all regulatory approvals required under the Purchase Agreement have now been obtained, and the condition of the Exchange Offer related to receipt of required regulatory approvals has been satisfied.

Opportunity for InterXion Shareholders to Receive Digital Realty’s Declared Quarterly Dividend

Earlier this week, Digital Realty’s Board of Directors authorized a common stock cash dividend of $1.12 per share to common stockholders of record as of the close of business onMarch 17, 2020. If 80% or more of outstanding InterXion shares on a fully-diluted andas-converted basis are tendered by the expiration of the initial offering period and all other required conditions are satisfied as described below, tendering InterXion shareholders should be holders of record of Digital Realty stock as of the record date and have the opportunity to receive the first-quarter dividend.

If the initial offering period is extended for any reason, InterXion shareholders would not be expected to become holders of record of Digital Realty common stock by the close of business on March 17, 2020, and consequently wouldnot be entitled to receive the first-quarter dividend in any closing of the offer.

Anticipated Timing for Completion of the Offer

Digital Realty expects to complete the pending exchange offer for all outstanding ordinary shares of InterXion as soon as reasonably practicable. Subject to satisfaction of the remaining required conditions, if 80% or more of the outstanding InterXion shares on a fully-diluted andas-converted basis are validly tendered and not withdrawn at the expiration of the initial offering period, Digital Realty expects to accept the validly tendered shares as early asMarch 9, 2020, with the post-offer reorganization transactions to be completed as soon as practicable after the expiration of any subsequent offering period.

Offer Expiration

Unless the offer is extended, the initial offering period will expire at12:01 a.m. EDT onMarch 9, 2020. (In other words, one minute after midnight on Sunday night / Monday morning. Please note, the Depository Trust Company and the exchange agent are closed on Saturdays and Sundays.) InterXion shareholders are encouraged to validly tender their shares before the close of normal New York business hours onFriday, March 6, 2020. No guaranteed delivery procedures apply.

Lowering the Minimum Condition

The offer is conditioned upon receipt by Digital Intrepid Holding B.V. (“Buyer”), a subsidiary of Digital Realty Trust, Inc., of a number of InterXion shares having been validly tendered and not withdrawn that would allow Buyer to acquire at least 80% of the outstanding InterXion shares on a fully-diluted andas-converted basis at the closing of the offer.

If less than 80% but more than 66 2/3% of the outstanding InterXion shares are tendered in the initial offering period, Digital Realty or Buyer may elect to reduce the minimum condition to 66 2/3% of the outstanding InterXion shares on a fully-diluted andas-converted basis, in which case the offer shall be extended for at least five business days (and no subsequent offering period will be provided).

Digital Realty or Buyer may also reduce the minimum condition to 66 2/3% prior to the expiration of the initial offering period (in which case a subsequent offering period will be provided). Digital Realty or Buyer may reduce the minimum condition below 66 2/3% with prior written consent from InterXion, subject to compliance with applicable laws.

Treatment of Untendered Shares after the Offer

As promptly as practicable following the later of the time at which Buyer accepts the tendered InterXion shares and the expiration of any applicable subsequent offering period, the parties shall initiate the post-offer reorganization.

If less than 95% of the outstanding InterXion shares are acquired by Buyer in the offer, the post-offer reorganization will result innon-tendering holders of InterXion receiving shares of Digital Realty common stock (and/or cash in lieu of fractional shares of Digital Realty common stock) pursuant to a liquidation distribution (rather than the offer).Non-tendering holders of InterXion shares who receive shares of Digital Realty common stock (and/or cash in lieu of fractional shares of Digital Realty common stock) pursuant to the liquidation distribution generally will be subject to a 15% Dutch dividend withholding tax.

If 95% or more of the outstanding InterXion shares are acquired by Buyer in the offer, Buyer will initiate Dutch compulsory acquisition proceedings, which will enable it to acquire the remaining InterXion shares against a cash amount as determined by a competent Dutch court.Non-tendering holders of InterXion shares who receive cash pursuant to Dutch compulsory acquisition proceedings will not be subject to the 15% Dutch dividend withholding tax. However, this process may materially delaynon-tendering InterXion shareholders’ receipt of this cash consideration.

Please refer to the offer to purchase for more information and a full description of the summaries above.

About Digital Realty

Digital Realty (NYSE: DLR) supports the data center, colocation and interconnection strategies of customers across the Americas, EMEA and APAC, ranging from cloud and information technology services, communications and social networking to financial services, manufacturing, energy, healthcare and consumer products. To learn more about Digital Realty, please visit digitalrealty.com or follow us on LinkedIn, Twitter, Facebook, Instagram and YouTube.

For Additional Information

Andrew P. Power

Chief Financial Officer

Digital Realty

(415)738-6500

Investor Relations

John J. Stewart

(415)738-6500

InvestorRelations@digitalrealty.com

Media Inquiries

John Christiansen / Reze Wong / Celia de Pentheny O’Kelly

Sard Verbinnen & Co

(415)618-8750

DigitalRealty-SVC@SARDVERB.com

Additional Information and Where to Find It

On December 6, 2019, Digital Realty filed a Registration Statement on FormS-4 in connection with the transactions contemplated by the Purchase Agreement, dated as of October 29, 2019, as amended, among Digital Realty, InterXion Holding N.V. and Buyer, which included a proxy statement/prospectus. This communication is for information purposes only and does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any proxy, vote or approval with respect to the proposed transaction or otherwise, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. The registration statement was declared effective by the SEC on January 27, 2020. Digital Realty has mailed a definitive proxy statement/prospectus to shareholders of Digital Realty and Buyer filed a Tender Offer Statement on Schedule TO with the SEC on January 29, 2020. InterXion filed a Solicitation / Recommendation Statement on Schedule14D-9 with respect to the exchange offer on January 29, 2020. The solicitation and offer to purchase the ordinary shares of InterXion will only be made pursuant to the Schedule TO and related offer to purchase. This material is not a substitute for the proxy statement / prospectus, the Schedule TO, the Schedule14D-9 or the

Registration Statement or for any other document that Digital Realty or InterXion may file with the SEC and send to Digital Realty’s stockholders or InterXion’s shareholders in connection with the proposed transactions.

BEFORE MAKING ANY VOTING OR INVESTMENT DECISION OR DECISION WITH RESPECT TO THE OFFER, WE URGE INVESTORS OF DIGITAL REALTY AND INTERXION TO READ THE REGISTRATION STATEMENT, PROXY STATEMENT / PROSPECTUS, SCHEDULE TO (INCLUDING AN OFFER TO PURCHASE, RELATED LETTER OF TRANSMITTAL AND OTHER OFFER DOCUMENTS) AND SCHEDULE14D-9, AS EACH MAY BE AMENDED OR SUPPLEMENTED FROM TIME TO TIME, AND OTHER RELEVANT DOCUMENTS FILED BY DIGITAL REALTY AND INTERXION WITH THE SEC CAREFULLY BECAUSE THEY CONTAIN IMPORTANT INFORMATION ABOUT DIGITAL REALTY, INTERXION AND THE PROPOSED TRANSACTIONS.

Investors can obtain free copies of the Registration Statement, proxy statement/prospectus, Schedule TO and Schedule14D-9, as each may be amended from time to time, and other relevant documents filed by Digital Realty and InterXion with the SEC at http://www.sec.gov, the SEC’s website, or free of charge from Digital Realty’s website (http://www.digitalrealty.com) or by contacting Digital Realty’s Investor Relations Department at (415)848-9311. These documents are also available free of charge from InterXion’s website (http://www.interxion.com) or by contacting InterXion’s Investor Relations Department at (813)644-9399.

Note Regarding Forward-Looking Statements

Digital Realty cautions that statements in this communication that are forward-looking, and provide other than historical information, involve risks, contingencies and uncertainties that may impact actual results of operations of Digital Realty, InterXion and the combined company. These forward-looking statements include, among other things, statements about the exchange offer and completion of the proposed transactions contemplated by the purchase agreement between them. Although we believe the expectations reflected in those forward-looking statements are reasonable, we can give no assurance that those expectations will prove to have been correct. Those statements are made by using various underlying assumptions and are subject to numerous risks, contingencies and uncertainties, including, among others: the ability of Digital Realty and InterXion to obtain the regulatory approvals necessary to complete the anticipated combination, on the anticipated timeline or at all; the risk that a condition to the closing of the anticipated combination may not be satisfied, on the anticipated timeline or at all or that the anticipated combination may fail to close; the outcome of any legal proceedings, regulatory proceedings or enforcement matters that may be instituted relating to the anticipated combination; the costs incurred to consummate the anticipated combination; the possibility that the expected synergies from the anticipated combination will not be realized, or will not be realized within the expected time period; difficulties related to the integration of the two companies; disruption from the anticipated combination making it more difficult to maintain relationships with customers, employees, regulators or suppliers; the diversion of management time and attention on the anticipated combination; adverse changes in the markets in which Digital Realty and InterXion operate or credit markets; and changes in the terms, scope or timing of contracts, contract cancellations, and other modifications and actions by customers and other business counterparties of Digital Realty and InterXion. If one or more of these risks materialize, or if underlying assumptions prove incorrect, actual results may vary materially from those expected. You should not place undue reliance on forward-looking statements. For a more complete discussion of these and other risk factors, please see (i) Digital Realty’s filings with the SEC, including its annual report on Form10-K for the year ended December 31, 2018 and subsequent quarterly reports on Form10-Q and (ii) InterXion’s filings with the SEC, including its annual report on Form20-F for the year ended December 31, 2018 and its subsequent reports on Form6-K. This communication reflects the views of Digital Realty’s management as of the date hereof. Except to the extent required by applicable law, Digital Realty undertakes no obligation to update or revise any forward-looking statement.