2017 InterXion Holding N.V. Annual Report For the year ended December 31, 2017 Carrier and cloud-neutral data centres at the heart of the European economy Carrier and cloud-neutral data centre services Interxion is a leading provider of carrier- and Cloud-neutral colocation data centre services with 50 state of the art facilities across 13 cities in 11 European countries. Twenty years of experience allow us to deliver operational excellence across our footprint, while consistent designs facilitate our customers’ ability to easily scale their deployments across Europe. Our data centre campuses are gateways to global connectivity networks and many submarine cables terminate in our data centres, increasingly from Asia, Africa and the Middle East. Our substantial reach across Europe provides our customers with access to approximately 80% of EU GDP. 02 / www.interxion.com Forward-looking statements This annual report contains forward-looking statements within These factors include, among other things: the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act ■ operating expenses cannot be easily reduced in the of 1934, as amended, with respect to all statements other short term; than statements of historical fact regarding our business, ■ inability to utilise the capacity of newly planned data financial condition, results of operations and certain of our centres and data centre expansions; plans, objectives, assumptions, projections, expectations or ■ significant competition; beliefs with respect to these items and statements regarding ■ cost and supply of electrical power; other future events or prospects. These statements include, without limitation, those concerning: our strategy and our ability ■ data centre industry over-capacity; to achieve it; expectations regarding sales, profitability and ■ performance under service level agreements. growth; plans for the construction of new data centers; our These and other risks described under “Risk Factors” (page ability to integrate new acquisitions; our possible or assumed 27), are not exhaustive. Other sections of this annual report future results of operations; research and development, capital describe additional factors that could adversely affect our expenditure and investment plans; adequacy of capital; and business, financial condition or results of operations including financing plans. The words “aim”, “may”, “will”, “expect”, delays in remediating the material weakness in internal control “anticipate”, “believe”, “future”, “continue”, “help”, “estimate”, over financial reporting and/or making disclosure controls and “plan”, “schedule”, “intend”, “should”, “shall” or the negative or procedures effective. In addition, new risk factors may emerge other variations thereof, as well as other statements regarding from time to time, and it is not possible for us to predict all matters that are not historical fact, are or may constitute such risk factors, nor can we assess the impact of all such risk forward-looking statements. factors to differ materially from those contained in any forward- In addition, this annual report includes forward-looking looking statements. Given these risks and uncertainties, you statements relating to our potential exposure to various types should not place undue reliance on forward-looking statements of market risks, such as foreign exchange rate risk, interest as a prediction of actual results. rate risks and other risks related to financial assets and All forward-looking statements included in this annual report liabilities. We have based these forward-looking statements on are based on information available to us at the date of this our management’s current view of future events and financial annual report. We undertake no obligation to update publicly performance. These views reflect the best judgment of our or revise any forward-looking statement, whether as a result management but involve a number of risks and uncertainties of new information, future events or otherwise, except as which could cause actual results to differ materially from those may be required by applicable law. All subsequent written predicted in our forward-looking statements and from past and oral forward-looking statements attributable to us or to results, performance or achievements. Although we believe persons acting on our behalf are expressly qualified in their that the estimates reflected in the forward-looking statements entirety by the cautionary statements contained throughout are reasonable, those estimates may prove to be incorrect. this annual report. By their nature, forward-looking statements involve risk and uncertainty because they relate to events and depend on circumstances that will occur in the future. There are a number of factors that could cause actual results and developments to differ materially from these expressed or implied by these forward-looking statements. www.interxion.com / 03 IN THIS REPORT Operational review Report of the Non-executive Directors 07 Our 2017 performance at a glance 08 Information on the Company 33 Evaluation 10 Innovation and technical excellence 33 Independence Non-executive Directors 10 Our commitment to sustainability 33 Internal control function 10 Organisational structure 33 Board committees 12 Our people Consolidated financial statements Financial review 35 Consolidated income statements 15 Income statement highlights 35 Consolidated statements of comprehensive income 17 Balance sheet highlights 36 Consolidated statements of financial position 18 Cash flow highlights 37 Consolidated statements of changes in shareholders’ equity Report of the Board of Directors 38 Consolidated statements of cash flows 39 Notes to the 2017 consolidated financial statements 21 Structure 21 Board of Directors Company financial statements 24 Directors’ Insurance and Indemnification 24 Executive Committees 99 InterXion Holding N.V. Company financial statements 26 Compensation 100 Notes to the 2017 Company financial statements 26 Shares beneficially owned 27 Risk management Other information 27 Risk factors 106 Independent auditor's report 29 Controls and procedures 112 Appendix 30 Dutch Corporate Governance Code 31 Outlook for 2018 Find out more 114 Our locations 114 Contact us 115 Definitions 04 / www.interxion.com www.interxion.com / 05 Operational review 06 / www.interxion.com OPERATIONAL REVIEW Our 2017 performance at a glance Interxion delivered another set of very good results in 2017, characterised by strong year-over-year growth in both Revenue and Adjusted EBITDA1. This was the result of our continued execution of a consistent strategy that we have successfully deployed for over a decade. Central to our strategy has been the development of targeted communities of interest. We have focused and continue to focus on attracting and developing the core connectivity and Cloud platforms that drive value for customers in our data centers. This strategic and disciplined approach has yielded strong growth rates across the markets where we operate, and we expect these trends to continue. Customer focus has always been at the heart of everything we do. By understanding our customers' requirements, not only have we been able to differentiate our company and sustain its growth, but we've also been able to anticipate future directions and make the appropriate investments to continue to meet our customers’ requirements. Our mission has not Our results for 2017 confirm continued changed – we enable our customers to enhance their value strong strategic execution and customer proposition by interconnecting their businesses within their communities of interest. recognition of our Communities of Interest and trusted provider status for their mission Our company sits at the heart of the digital economy. It is in critical applications." our data centers that the data and content lives, where data is gathered and processed and where the hubs to transfer the David Ruberg data around the world are based. And since the digitization Chief Executive Officer of the consumer and enterprise worlds is still in the very early stages and the future growth opportunity for Interxion remains substantial. We are seeing opportunities across the deal size spectrum and revenue growth rates have remained strong across our Record of success footprint, while customer churn has remained low. Bookings Total Revenue Adjusted EBITDA have been strong across a number of main business €500m €250m segments, particularly cloud and connectivity platforms as well 489.3 as the enterprise segment in general and, specifically, financial 221.0 421.8 services and digital media. Customers recognize the value of 190.9 €400m €200m our communities of interest and our trusted provider status for 386.6 their mission critical applications. 340.6 171.3 307.1 146.4 €300m €150m In response to healthy customer demand, we continued 131.8 to expand in Europe throughout 2017 opening 4 new data centers in 3 markets: FRA11 and FRA12 in Frankfurt, MRS2 in €200m €100m Marseille and STO5 in Stockholm and completing expansions of existing data centers in 7 countries. €100m €50m As 2018 gets underway, I thank all our employees for their on-going contributions. Their dedication and commitment is fundamental to Interxion’s continuing success. 2013 2014 2015 2016 2017 2013 2014 2015 2016 2017 David Ruberg, Chief Executive Officer May 23, 2018 1. Adjusted EBITDA is a non-IFRS measure. Refer to “Definitions” for a detailed explanation of this measure. Note