As previously noted, the implementation of International Financial Reporting Standard 16 - Leases ("IFRS 16") on 1 January 2019 reclassified certain expense items, thus impacting the comparability of our results to periods prior to the implementation of IFRS 16. This accounting change had no impact on our revenues or underlying net cash flows. A reconciliation from Adjusted EBITDA and Adjusted EBITDA margin reported after giving effect to IFRS 16 to corresponding measures excluding the impact of IFRS 16 are provided later in this press release.

Revenue in the second quarter of 2019 was €158.5 million, a 14% increase over the second quarter of 2018 and a 5% increase over the first quarter of 2019. Recurring revenue was €150.0 million, a 14% increase over the second quarter of 2018 and a 3% increase over the first quarter of 2019. Recurring revenue in the second quarter represented 95% of total revenue. On a constant currency⁽⁶⁾ basis, revenue in the second quarter of 2019 was 14% higher than in the second quarter of 2018.

Equipped space at the end of the second quarter of 2019 was 154,800 square metres, compared to 132,600 square metres at the end of the second quarter of 2018 and 148,300 square metres at the end of the first quarter of 2019. Revenue generating space at the end of the second quarter of 2019 was 121,600 square metres, compared to 106,200 square metres at the end of the second quarter of 2018 and 119,000 square metres at the end of the first quarter of 2019. Utilisation rate, the ratio of revenue generating space to equipped space, was 79% at the end of the second quarter of 2019, compared to 80% at the end of the second quarter of 2018 and 80% at the end of the first quarter of 2019.

In Stockholm, STO6 will be constructed in four phases, delivering a total of 3,300 sqm of equipped space and 5 megawatts ("MW") of customer available power when fully built out. The first phase of STO6, which is expected to provide approximately 500 sqm, is scheduled to open in 2Q 2020. The second phase is expected to provide approximately 600 sqm and is scheduled to open in 4Q 2020. The capital expenditure associated with the first two phases of STO6 is expected to be approximately €21 million.

This communication contains forward-looking statements that involve risks and uncertainties. There can be no assurance that such statements will prove to be accurate and actual results and future events could differ materially from those anticipated in such forward-looking statements. Factors that could cause actual results and future events to differ materially from Interxion's expectations include, but are not limited to, the difficulty of reducing operating expenses in the short term, the inability to utilise the capacity of newly planned data centres and data centre expansions, significant competition, the cost and supply of electrical power, data centre industry over-capacity, performance under service level agreements, delays in remediating the material weakness in internal control over financial reporting and/or making disclosure controls and procedures effective, certain other risks detailed herein and other risks described from time to time in Interxion's filings with the United States Securities and Exchange Commission (the "SEC").

These materials include non-IFRS financial measures and ratios, including (i) Adjusted EBITDA; (ii) Adjusted EBITDA margin, (iii) Adjusted EBITDA excluding the impact of IFRS 16; (iv) Adjusted EBITDA margin excluding the impact of IFRS 16; (v) Recurring revenue; (vi) Revenue on a constant currency basis; (vii) Adjusted net income; (viii) Adjusted basic earnings per share; (ix) Adjusted diluted earnings per share and (x) Cash generated from operations, that are not required by, or presented in accordance with, IFRS.

Other companies may present Adjusted EBITDA, Adjusted EBITDA margin, Adjusted EBITDA excluding the impact of IFRS 16, Adjusted EBITDA margin excluding the impact of IFRS 16, Recurring revenue, Revenue on a constant currency basis, Adjusted net income, Adjusted basic earnings per share, Adjusted diluted earnings per share and Cash generated from operations differently than we do. None of these measures are measures of financial performance under IFRS and should not be considered as a measure of liquidity or as an alternative to Profit for the period attributable to shareholders ("Net income") or as indicators of our operating performance or any other measure of performance implemented in accordance with IFRS.

• Depreciation and amortisation – property, plant and equipment and intangible assets (except goodwill) are depreciated and amortised on a straight-line basis over the estimated useful life. We believe that these costs do not represent our operating performance.
• Share-based payments – represents primarily the fair value at the date of grant of employee equity awards, which is recognized as an expense over the vesting period. In certain cases, the fair value is redetermined for market conditions at each reporting date, until the final date of grant is achieved. We believe that this expense does not represent our operating performance.
• Income or expense related to the evaluation and execution of potential mergers or acquisitions ("M&A") – under IFRS, gains and losses associated with M&A activity are recognized in the period in which such gains or losses are incurred. We exclude these effects because we believe they are not reflective of our ongoing operating performance.
• Adjustments related to terminated and unused data centre sites – these gains and losses relate to historical leases entered into for certain brownfield sites, with the intention of developing data centres, which were never developed, and for which management has no intention of developing into data centres. We believe the impact of gains and losses related to unused data centres is not reflective of our business activities and our ongoing operating performance.

For a reconciliation of Net income to Adjusted EBITDA and from Adjusted EBITDA to Adjusted EBITDA excluding the impact of IFRS 16, see the notes to the Condensed Consolidated Interim Financial Statements. Adjusted EBITDA, Adjusted EBITDA margin, Adjusted EBITDA excluding the impact of IFRS 16, Adjusted EBITDA margin excluding the impact of IFRS 16 and other key performance indicators may not be indicative of our historical results of operations based on IFRS, nor are they meant to be predictive of future results under IFRS.

We define Recurring revenue as revenue incurred from colocation and associated power charges, office space, amortised set-up fees, cross-connects and certain recurring managed services (but excluding any ad hoc managed services) provided by us directly or through third parties, excluding rents received for the sublease of unused sites. Management believes that the exclusion of these items provides useful supplemental information to revenue from colocation and associated power charges to aid investors in evaluating the recurring revenue performance of our business. For a reconciliation of Revenue to Recurring revenue, see the notes to the Condensed Consolidated Interim Financial Statements.

We present constant currency information for revenue to provide a framework for assessing how our underlying businesses performed excluding the effect of foreign currency rate fluctuations. To present this information, current and comparative prior period results for entities reporting in currencies other than Euro are converted into Euro using the average exchange rates from the prior period rather than the actual exchange rates in effect during the current period. We believe that revenue growth is a key indicator of how a company is progressing from period to period and presenting constant currency information for revenue provides useful supplemental information to investors regarding our on-going operational performance because it helps us and our investors evaluate the on-going operating performance of the business after removing the impact of currency exchange rates.

We believe Adjusted EBITDA, Adjusted EBITDA margin, Adjusted EBITDA excluding the impact of IFRS 16, Adjusted EBITDA margin excluding the impact of IFRS 16, Recurring revenue and Revenue on a constant currency basis provide useful supplemental information to investors regarding our ongoing operational performance. These measures help us and our investors evaluate the ongoing operating performance of the business after removing the impact of our capital structure (primarily interest expense), our asset base (primarily depreciation and amortisation) and the implementation of new accounting standards. Management believes that the presentation of Adjusted EBITDA and Adjusted EBITDA excluding the impact of IFRS 16, when combined with the primary IFRS presentation of Net income, provides a more complete analysis of our operating performance. Management also believes the use of Adjusted EBITDA and Adjusted EBITDA excluding the impact of IFRS 16 facilitates comparisons between us and other data centre operators (including other data centre operators that are REITs) and other infrastructure-based businesses. Adjusted EBITDA excluding the impact of IFRS 16 is also a relevant measure used in the financial covenants of our revolving credit facility and our 4.75% Senior Notes due 2025. Pursuant to the terms of our revolving credit facility and our 4.75% Senior Notes due 2025, the calculation of Adjusted EBITDA for the purposes of the financial covenants is determined in accordance with IFRS as of the date of the financing agreements and therefore does not include the impact of IFRS 16.

• Income or expense related to the evaluation and execution of potential mergers or acquisitions ("M&A") – under IFRS, gains and losses associated with M&A activity are recognized in the period in which such gains or losses are incurred. We exclude these effects because we believe they are not reflective of our ongoing operating performance.
• Adjustments related to provisions – these adjustments are made for adjustments in provisions that are not reflective of the ongoing operating performance of Interxion. These adjustments may include changes in provisions for onerous lease contracts.
• Adjustments related to capitalized interest – under IFRS, we are required to calculate and capitalize interest allocated to the investment in data centres and exclude it from Net income. We believe that reversing the impact of capitalized interest provides information about the impact of the total interest costs and facilitates comparisons with other data centre operators.

Management believes that the exclusion of certain items listed above provides useful supplemental information to Net income to aid investors in evaluating the operating performance of our business and comparing our operating performance with other data centre operators and infrastructure companies. We believe the presentation of Adjusted net income, when combined with Net income prepared in accordance with IFRS, is beneficial to a complete understanding of our performance. A reconciliation from reported Net income to Adjusted net income is provided in notes to the Condensed Consolidated Interim Financial Statements.

In addition to Adjusted EBITDA, Adjusted EBITDA margin, Adjusted EBITDA excluding the impact of IFRS 16, Adjusted EBITDA margin excluding the impact of IFRS 16, Recurring revenue, Revenue on a constant currency basis, Adjusted net income, Adjusted basic earnings per share, Adjusted diluted earnings per share and Cash generated from operations, our management also uses the following key performance indicators as measures to evaluate our performance:

• Equipped space: the amount of data centre space that, on the date indicated, is equipped and either sold or could be sold, without making any significant additional investments to common infrastructure. Equipped space at a particular data centre may decrease if either (a) the power requirements of customers at a data centre change so that all or a portion of the remaining space can no longer be sold because the space does not have enough power capacity and/or common infrastructure to support it without further investment or (b) if the design and layout of a data centre changes to meet among others, fire regulations or customer requirements, and necessitates the introduction of common space (such as corridors) which cannot be sold to individual customers;
• Revenue generating space: the amount of Equipped space that is under contract and billed on the date indicated;
• Utilisation rate: on the date indicated, Revenue generating space as a percentage of Equipped space. Some Equipped space is not fully utilised because of customers' specific requirements regarding the layout of their equipment. In practice, therefore, Utilisation rate does not reach 100%.

Interxion (NYSE:INXN) is a leading provider of carrier and cloud-neutral colocation data centre services in Europe, serving a wide range of customers through 53 data centres in 11 European countries. Interxion's uniformly designed, energy efficient data centres offer customers extensive security and uptime for their mission-critical applications. With over 700 connectivity providers, 21 European Internet exchanges, and most leading cloud and digital media platforms across its footprint, Interxion has created connectivity, cloud, content and finance hubs that foster growing customer communities of interest. For more information, please visit www.interxion.com.

¹ All of the following items are non-IFRS measures intended to adjust for certain items and are not measures of financial performance under IFRS: "Adjusted EBITDA", "Adjusted EBITDA margin", "Adjusted EBITDA excluding the impact of IFRS 16", "Adjusted EBITDA margin excluding the impact of IFRS 16", "Recurring revenue", "Revenue on a constant currency basis", "Adjusted net income", "Adjusted basic earnings per share", "Adjusted diluted earnings per share" and "Cash generated from operations". Complete definitions can be found in the "Non-IFRS Financial Measures" section in this press release. Reconciliations of Net income to Adjusted EBITDA, Adjusted EBITDA to Adjusted EBITDA excluding the impact of IFRS 16, Net income to Adjusted net income and Revenue to Recurring revenue, can be found in the financial tables later in this press release.

⁶ We present constant currency information to assess how our underlying businesses performed excluding the effect of foreign currency rate fluctuations. To present this information, current and comparative prior period results for entities reporting in currencies other than Euro are converted into Euro using the average exchange rates from the prior period rather than the actual exchange rates in effect during the current period.