6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 UNDER

THE SECURITIES EXCHANGE ACT OF 1934

Report on Form 6-K dated 6 March 2019

(Commission File No. 001-35053)

INTERXION HOLDING N.V.

(Translation of Registrant’s Name into English)

Scorpius 30, 2132 LR Hoofddorp, The Netherlands, +31 20 880 7600

(Address of Principal Executive Office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F  ☒             Form 40-F  ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):  ☐

Note: Regulation S-T Rule 101(b)(1) only permits the submission in paper of a Form 6-K if submitted solely to provide an attached annual report to security holders.

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7) ):  ☐

Note: Regulation S-T Rule 101(b)(7) only permits the submission in paper of a Form 6-K if submitted to furnish a report or other document that the registrant foreign private issuer must furnish and make public under the laws of the jurisdiction in which the registrant is incorporated, domiciled or legally organized (the registrant’s “home country”), or under the rules of the home country exchange on which the registrant’s securities are traded, as long as the report or other document is not a press release, is not required to be and has not been distributed to the registrant’s security holders, and, if discussing a material event, has already been the subject of a Form 6-K submission or other Commission filing on EDGAR.

This report contains Interxion Holding N.V.’s (1) fourth quarter and full year 2018 earnings press release and (2) presentation materials to be used during a conference call with investors on 6 March 2019.

Exhibit
99.1	The press release “Interxion Reports Fourth Quarter and Full Year 2018 Results”, dated 6 March 2019.
99.2	Presentation materials to be used during a conference call with investors on 6 March 2019.

SIGNATURE

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, thereunto duly authorized.

INTERXION HOLDING N.V.
By:	/s/ David C. Ruberg
Name:	David C. Ruberg
Title:	Chief Executive Officer

Date: 6 March 2019

EX-99.1

Exhibit 99.1

Press Release, 6 March 2019

Interxion Reports Fourth Quarter and Full Year 2018 Results

15% Full Year Revenue Growth

AMSTERDAM 6 March 2019 – InterXion Holding NV (NYSE: INXN), a leading European provider of carrier and cloud-neutral colocation data centre services, announced its results today for the three months and full year ended 31 December 2018.

Financial Highlights^*

• Revenue for the fourth quarter and full year increased by 13% and 15% to €146.9 million and €561.8 million, respectively (4Q 2017: €129.9 million; FY 2017: €489.3 million).

• Recurring revenue¹ for the fourth quarter and full year increased by 13% and 15% to €139.7 million and €533.1 million, respectively (4Q 2017: €123.4 million; FY 2017: €462.5 million).

• Net income for the fourth quarter and full year decreased by 18% and 20% to €8.0 million and €31.1 million, respectively (4Q 2017: €9.7 million; FY 2017: €39.1 million).

• Adjusted net income² for the fourth quarter decreased by 26% to €7.8 million (4Q 2017: €10.6 million) and was flat for the full year compared to the prior year at €40.2 million.

• Diluted earnings per share for the fourth quarter and full year were €0.11 and €0.43, respectively (4Q 2017: €0.14; FY 2017: €0.55).

^*  As previously reported, certain comparative figures for the three months and twelve months ended 31 December 2017 have been restated compared to the amounts disclosed on Form 6-K furnished on 7 March 2018. For further details on the correction of this error, see Note 2 and Note 29 of our 2017 Consolidated Financial Statements included on Form 20-F, filed with the SEC on 30 April 2018.

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• Adjusted diluted earnings² per share for the fourth quarter and full year were €0.11 and €0.56, respectively (4Q 2017: €0.15; FY 2017: €0.56).

• Adjusted EBITDA² for the fourth quarter and full year increased by 15% and 17% to €67.7 million and €257.8 million, respectively (4Q 2017: €59.1 million; FY 2017: €221.0 million).

• Adjusted EBITDA margin for the fourth quarter and full year was 46.1% and 45.9%, up 60 basis points and up 70 basis points, respectively (4Q 2017: 45.5%; FY 2017: 45.2%).

• Capital expenditures, including intangible assets³, were €131.3 million in the fourth quarter and €451.2 million for full year (4Q 2017: €69.7 million; FY 2017: €256.0 million).

Operating Highlights

• Equipped space⁴ increased by 4,500 square metres in the fourth quarter and 22,300 square metres in the full year to 144,800 square metres.

• Revenue generating space⁴ increased by 3,800 square metres in the fourth quarter and 15,200 square metres in the full year to 115,000 square metres.

• Utilisation rate was 79% at the end of 2018.

• During the fourth quarter 2018, Interxion completed the following expansions:

• 2,700 sqm expansion in Amsterdam;

• 1,500 sqm expansion in Paris; and,

• 300 sqm expansion in Frankfurt.

“Our highly-connected data centres continue to attract strong demand from all customer segments, resulting in solid booking trends across our European footprint,” said David Ruberg, Interxion’s Chief Executive Officer. “The underlying drivers of this growth are secular in nature, reflecting the widespread adoption of digital technologies

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by consumers and enterprises alike. The cloud and content platforms continue to lead the way, which in turn, require larger infrastructure capacities for core and edge deployments. We are still in the early stages of this transformation and believe there is a substantial opportunity ahead of us.”

Quarterly Review

Revenue in the fourth quarter of 2018 was €146.9 million, a 13% increase from the fourth quarter of 2017 and a 3% increase from the third quarter of 2018. Recurring revenue was €139.7 million, a 13% increase from the fourth quarter of 2017 and a 4% increase from the third quarter of 2018. Recurring revenue in the fourth quarter represented 95% of total revenue. On an organic constant currency⁵ basis, revenue in the fourth quarter of 2018 was 13% higher than in the fourth quarter of 2017 and 3% higher than in the third quarter of 2018.

Cost of sales in the fourth quarter of 2018 was €57.2 million, a 17% increase from the fourth quarter of 2017 and a 2% increase from the third quarter of 2018.

Gross profit was €89.7 million in the fourth quarter of 2018, an 11% increase from the fourth quarter of 2017 and a 4% increase from the third quarter of 2018. Gross profit margin was 61.1% in the fourth quarter of 2018, compared to 62.4% in the fourth quarter of 2017 and 60.7% in the third quarter of 2018.

Sales and marketing costs in the fourth quarter of 2018 were €9.5 million, a 5% increase from the fourth quarter of 2017 and a 9% increase from the third quarter of 2018.

General and administrative costs, excluding the items we adjust for in the determination of Adjusted EBITDA, were €12.5 million in the fourth quarter of 2018, a 3% decrease over the fourth quarter of 2017 and a 6% increase from the third quarter of 2018.

Depreciation and amortisation in the fourth quarter of 2018 was €34.3 million, an 18% increase from the fourth quarter of 2017 and a 4% increase from the third quarter of 2018.

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Operating income in the fourth quarter of 2018 was €31.0 million, a 20% increase from the fourth quarter of 2017 and a 15% increase from the third quarter of 2018.

Net finance expense for the fourth quarter of 2018 was €15.8 million, a 28% increase from the fourth quarter of 2017 and a 34% increase from the third quarter of 2018.

Income tax expense for the fourth quarter of 2018 was €7.3 million, a 98% increase compared to the fourth quarter of 2017 and a 64% increase from the third quarter of 2018. While benefiting from reductions in statutory corporate tax rates in a number of countries of operation, there was an associated non-cash negative impact to deferred tax assets. In the fourth quarter 2018, this charge amounted to €2.4 million.

Net income was €8.0 million in the fourth quarter of 2018, an 18% decrease over the fourth quarter of 2017 and a 27% decrease from the third quarter of 2018.

Adjusted net income was €7.8 million in the fourth quarter of 2018, a 26% decrease over the fourth quarter of 2017 and a 33% decrease from the third quarter of 2018.

Adjusted EBITDA for the fourth quarter of 2018 was €67.7 million, a 15% increase from the fourth quarter of 2017 and a 3% increase from the third quarter of 2018.

Adjusted EBITDA margin was 46.1% in the fourth quarter of 2018, compared to 45.5% in the fourth quarter of 2017 and 46.3% in the third quarter of 2018.

Net cash flows from operating activities were €44.8 million in the fourth quarter of 2018, compared to €45.5 million in the fourth quarter of 2017 and €53.9 million in the third quarter of 2018.

Cash generated from operations⁶ was €76.9 million in the fourth quarter of 2018, compared to €50.3 million in the fourth quarter of 2017 and €60.9 million in the third quarter of 2018.

Capital expenditures, including intangible assets, were €131.3 million in the fourth quarter of 2018, compared to €69.7 million in the fourth quarter of 2017 and €103.2 million in the third quarter of 2018.

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Cash and cash equivalents were €186.1 million at 31 December 2018, compared to €38.5 million at 31 December 2017.

Total borrowings, excluding revolving facility deferred financing costs, were €1,287.9 million at 31 December 2018, compared to €832.6 million at 31 December 2017. As at 31 December 2018 no amounts had been drawn under this facility. During the first quarter of 2019, Interxion increased its unsecured revolving credit facility by €100 million for total commitment of €300 million.

Equipped space at the end of the fourth quarter of 2018 was 144,800 square metres, compared to 122,500 square metres at the end of the fourth quarter of 2017 and 140,300 square metres at the end of the third quarter of 2018.

Revenue generating space at the end of the fourth quarter of 2018 was 115,000 square metres, compared to 99,800 square metres at the end of the fourth quarter of 2017 and 111,200 square metres at the end of the third quarter of 2018.

Utilisation rate, the ratio of revenue-generating space to equipped space, was 79% at the end of the fourth quarter of 2018, compared to 81% at the end of the fourth quarter of 2017 and 79% at the end of the third quarter of 2018.

Annual Review

Revenue for 2018 was €561.8 million, a 15% increase compared to 2017. Recurring revenue for 2018 was €533.1 million, a 15% increase compared to 2017, and accounted for 95% of total revenue in 2018, consistent with 2017. On an organic constant currency basis, revenue in 2018 was 15% higher than in 2017.

Gross profit was €342.3 million in 2018, a 15% increase compared to 2017. Gross profit margin was 60.9% in 2018, a decrease of 20 bps compared to 2017.

Sales and marketing costs for 2018 were €36.5 million, a 9% increase compared to 2017.

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Adjusted EBITDA for 2018 was €257.8 million, a 17% increase compared to 2017. Adjusted EBITDA margin for 2018 was 45.9%, an increase of 70 bps compared to 2017.

Net income was €31.1 million in 2018, compared to €39.1 million in 2017. Diluted earnings per share in 2018 were €0.43 on a weighted average of 72.1 million shares, compared to €0.55 on a weighted average of 71.5 million shares in 2017.

Adjusted net income was €40.2 million in both 2018 and 2017. Adjusted diluted earnings per share were €0.56 on a weighted average of 72.1 million shares, compared to €0.56 on a weighted average of 71.5 million shares in 2017. A reconciliation from Net income to Adjusted net income is provided in the tables attached to this press release.

Cash generated from operations was €251.0 million in 2018, an increase of 20% compared to 2017.

Capital expenditures, including intangible assets, were €451.2 million in 2018 compared to €256.0 million in 2017.

During 2018, Equipped space increased by 22,300 square metres, and Revenue generating space increased by 15,200 square metres⁴. Utilisation rate was 79% as of 31 December 2018, compared to 81% as of 31 December 2017.

Expansions in Frankfurt and Zurich; Land Purchase in Copenhagen

In response to continuing strong demand, Interxion is today announcing that it will construct a new data centre in Zurich (“ZUR2”) and expand its FRA15 data centre in Frankfurt. In addition, Interxion has purchased land to expand its Copenhagen campus.

In Zurich, ZUR2 will be built on land purchased in the fourth quarter of 2018. It will be constructed in four phases delivering 6,600 square metres of equipped space and 12 MW of customer available power when fully built out. The first phase of ZUR2 is expected to provide 1,700 sqm and is scheduled to be completed in the first quarter of

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2020. The second phase is expected to provide 1,900 sqm and is scheduled to become available in the third quarter of 2020. The capital expenditure associated with the full build of ZUR2 and the associated land, is expected to be approximately €120 million.

In Frankfurt, Interxion will expand its FRA15 data centre by constructing Phase 2 which will add an additional 2,600 square metres of equipped space that is scheduled to open in the fourth quarter of 2020. Capital expenditure associated with the first two phases of FRA15 is expected to be approximately €137 million.

In Copenhagen, Interxion has expanded its land bank by purchasing land adjacent to its existing data centres sufficient to add capacity of approximately 15,000 square metres in equipped space to the existing campus. The capital expenditure associated with the Copenhagen land purchase was approximately €10 million.

Business Outlook

Interxion today is providing guidance for full year 2019:

	2018 (As Reported)	2018 (IFRS16(a)(b) basis)	2019 Guidance (IFRS 16(a))
Revenue	€561.8 million	€562.1 million	€632 million – €647 million
Adjusted EBITDA	€257.8 million	€296.5 million	€324 million –€334 million
Capital expenditures (including intangibles)	€451.2 million	€451.2 million	€570 million –€600 million

(a) IFRS16 refers to the International Financial Reporting Standard 16 – Leases, which the company adopted from 1 January 2019. Under IFRS16, operating leases will be recognized as right of use assets and lease liabilities, and certain components of revenue will be recognized as lease revenue.

(b) The 2018 results on an IFRS16 basis represent the Company’s estimates as if IFRS16 had been adopted as of 1 January 2018. On this basis, revenue for 2018 would have remained broadly unchanged versus as reported. Adjusted EBITDA for 2018 increases

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by €38.7 million, primarily due to changes in the treatment of rent expenses. The 2018 results on an IFRS16 basis are being presented solely for comparative purposes in the context of the Company’s 2019 guidance.

Conference Call to Discuss Results

Interxion will host a conference call today at 8:30 a.m. ET (1:30 p.m. GMT, 2:30 p.m. CET) to discuss the results.

To participate on this call, U.S. callers may dial toll free 1-866-966-1396; callers outside the U.S. may dial direct +44 (0) 2071 928 000. The conference ID for this call is INXN. This event also will be webcast live over the Internet in listen-only mode at investors.interxion.com.

A replay of this call will be available shortly after the call concludes and will be available until 19 March 2019. To access the replay, U.S. callers may dial toll free 1-866-331-1332; callers outside the U.S. may dial direct +44 (0) 3333 009 785. The replay access number is 6137888.

Forward-looking Statements

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”).

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Interxion does not assume any obligation to update the forward-looking information contained in this report.

Non-IFRS Financial Measures

Included in these materials are certain non-IFRS financial measures, which are measures of our financial performance that are not calculated and presented in accordance with IFRS, within the meaning of applicable SEC rules. These measures are as follows: (i) Adjusted EBITDA; (ii) Recurring revenue; (iii) Revenue on an organic constant currency basis; (iv) Adjusted net income; (v) Adjusted basic earnings per share; (vi) Adjusted diluted earnings per share and (vii) Cash generated from operations.

Other companies may present Adjusted EBITDA, Recurring revenue, Revenue on an organic 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. Each of these measures are not measures of financial performance under IFRS and should not be considered as an alternative to operating income or as a measure of liquidity or an alternative to Profit for the period attributable to shareholders (“net income”) as indicators of our operating performance or any other measure of performance implemented in accordance with IFRS.

Adjusted EBITDA, Recurring revenue and Revenue on an organic constant currency basis

We define Adjusted EBITDA as Operating income adjusted for the following items, which may occur in any period, and which management believes are not representative of our operating performance:

• Depreciation and amortisation – property, plant and equipment and intangible assets (except goodwill) are depreciated 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 recognised 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.

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• 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 recognised in the period in which such gains or losses are incurred. We exclude these effects because we believe they are not reflective of our on-going 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 are not reflective of our business activities and our on-going operating performance.

In certain circumstances, we may also adjust for other items that management believes are not representative of our current on-going performance. Examples include: adjustments for the cumulative effect of a change in accounting principle or estimate, impairment losses, litigation gains and losses or windfall gains and losses.

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.

We believe Adjusted EBITDA and Recurring revenue provide useful supplemental information to investors regarding our on-going operational performance. These measures help us and our investors evaluate the on-going operating performance of the business after removing the impact of our capital structure (primarily interest expense) and our asset base (primarily depreciation and amortisation). Management believes that the presentation of Adjusted EBITDA, 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 facilitates comparisons between us and other data centre operators (including other data centre

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operators that are REITs) and other infrastructure-based businesses. Adjusted EBITDA is also a relevant measure used in the financial covenants of our revolving credit facility and our 4.75% Senior Notes due 2025.

A reconciliation from net income to Adjusted EBITDA is provided in the tables attached to this press release. Adjusted EBITDA 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 present organic constant currency information for revenue to provide a framework for assessing how our underlying businesses performed excluding the effect of acquisitions and foreign currency rate fluctuations. For purposes of calculating revenue on an organic constant currency basis, revenues from entities acquired during the current and comparison periods are excluded. Also, 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 organic 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 acquisitions and currency exchange rates.

Adjusted net income, Adjusted basic earnings per share and Adjusted diluted earnings per share

We define Adjusted net income as net income adjusted for the following items and the related income tax effect, which may occur in any period, and which management believes are not reflective of 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 recognised in the period in which such gains or losses are incurred. We exclude these effects because we believe they are not reflective of our on-going operating performance.

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• Adjustments related to provisions – these adjustments are made for adjustments in provisions that are not reflective of the on-going operating performance of Interxion. These adjustments may include changes in provisions for onerous lease contracts.

• Adjustments related to capitalised interest – under IFRS, we are required to calculate and capitalise interest allocated to the investment in data centres and exclude it from net income. We believe that reversing the impact of capitalised interest provides information about the impact of the total interest costs and facilitates comparisons with other data centre operators.

In certain circumstances, we may also adjust for other items that management believes are not representative of our current on-going performance. Examples include: adjustments for the cumulative effect of a change in accounting principle or estimate, impairment losses, litigation gains and losses or windfall gains and losses.

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 the tables attached to this press release.

Adjusted basic earnings per share and Adjusted diluted earnings per share amounts are determined on Adjusted net income.

Cash generated from operations

Cash generated from operations is defined as net cash flows from operating activities, excluding interest and corporate income tax payments and receipts. Management believes that the exclusion of these items provides useful supplemental information to net cash flows from operating activities to aid investors in evaluating the cash generating performance of our business.

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Management’s outlook for 2019 included in this press release includes a range for expected Adjusted EBITDA, a non-IFRS financial measure, which excludes items that management believes are not representative of our operating performance. These items include, but are not limited to, depreciation and amortisation, share-based payments, income or expense related to the evaluation and execution of potential mergers or acquisitions, adjustments related to terminated and unused data centre sites, and other significant items that currently cannot be predicted. The exact amount of these items is not currently determinable but may be significant. Accordingly, the company is unable to provide equivalent reconciliations from the corresponding forward-looking IFRS measures to expected Adjusted EBITDA.

-ENDS-

About Interxion

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 51 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.

Contact information:

Interxion

Jim Huseby

Investor Relations

Tel: +1-813-644-9399

IR@interxion.com

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¹  Recurring revenue is 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.

²  Adjusted net income (or ‘Adjusted diluted earnings’) and Adjusted EBITDA are non-IFRS figures intended to adjust for certain items and are not measures of financial performance under IFRS. Complete definitions can be found in the “Non-IFRS Financial Measures” section in this press release. Reconciliations of net income to Adjusted EBITDA and net income to Adjusted net income can be found in the financial tables later in this press release.

³  Capital expenditures, including intangible assets, represent payments to acquire property, plant, equipment and intangible assets, as recorded in the consolidated statement of cash flows as “Purchase of property, plant and equipment” and “Purchase of intangible assets”, respectively.

⁴ Starting from the end of 1Q 2018, the number of square metres includes 2,300 sqm of equipped space and 1,300 sqm of revenue generating space from Interxion Science Park. The number of square metres in 4Q 2017 excludes the impact of Interxion Science Park.

⁵  We present organic constant currency information to provide a framework for assessing how our underlying businesses performed excluding the effect of acquisitions and foreign currency rate fluctuations. For purposes of calculating Revenue on an organic constant currency basis, revenues from entities acquired during the current and comparison periods are excluded. Also, 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. The reconciliation of total revenue growth to total revenue growth on an organic constant currency basis, is as follows:

Three months ended 31 December 2018	Year-on-year			Sequential
Reported total revenue growth		13.1	%		3.3	%
Add back: impact of foreign currency translation		0.1	%		-0.1	%
Reverse: impact of acquired Interxion Science Park		0.0	%		0.0	%
Total revenue growth on an organic constant currency basis		13.2	%		3.2	%
Year ended 31 December 2018	Year-on-year
Reported total revenue growth		14.8	%
Add back: impact of foreign currency translation		0.6	%
Reverse: impact of acquired Interxion Science Park		-0.2	%
Total revenue growth on an organic constant currency basis		15.2	%

Percentages may not sum due to rounding.

⁶  We define Cash generated from operations as net cash flows from operating activities, excluding interest and fees paid, interest received and income tax paid.

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INTERXION HOLDING NV

CONDENSED CONSOLIDATED INCOME STATEMENTS

(in €‘000 – except per share data and where stated otherwise)

(unaudited)

	Three Months Ended						Year Ended
	Dec-31 2018			Dec-31 2017(a)			Dec-31 2018			Dec-31 2017(a)
Revenue		146,901			129,881			561,752			489,302
Cost of sales		(57,213	)		(48,842	)		(219,462	)		(190,471	)
Gross Profit		89,688			81,039			342,290			298,831
Other income		—			70			86			97
Sales and marketing costs		(9,475	)		(9,008	)		(36,494	)		(33,465	)
General and administrative costs		(49,199	)		(46,349	)		(194,646	)		(167,190	)
Operating income		31,014			25,752			111,236			98,273
Net finance expense		(15,753	)		(12,327	)		(61,784	)		(44,367	)
Profit before income taxes		15,261			13,425			49,452			53,906
Income tax expense		(7,281	)		(3,681	)		(18,334	)		(14,839	)
Net income		7,980			9,744			31,118			39,067
Basic earnings per share(b): (€)		0.11			0.14			0.43			0.55
Diluted earnings per share(c): (€)		0.11			0.14			0.43			0.55
Number of shares outstanding at the end of the period (shares in thousands)		71,708			71,415			71,708			71,415
Weighted average number of shares for Basic EPS (shares in thousands)		71,694			71,343			71,562			71,089
Weighted average number of shares for Diluted EPS (shares in thousands)		72,182			71,813			72,056			71,521

	As at
Capacity metrics	Dec-31 2018			Dec-31 2017
Equipped space (in square meters)(d)		144,800			122,500
Revenue generating space (in square meters)(d)		115,000			99,800
Utilisation rate		79	%		81	%

(a) As previously reported, certain comparative figures for the three months and twelve months ended 31 December 2017 have been restated compared to the amounts disclosed on Form 6-K furnished on 7 March 2018. For further details, see Note 2 and Note 29 of our 2017 Consolidated Financial Statements included on Form 20-F, filed with the SEC on 30 April 2018.

(b) Basic earnings per share are calculated as net income divided by the weighted average number of shares for Basic EPS.

(c) Diluted earnings per share are calculated as net income divided by the weighted average number of shares for Diluted EPS.

(d) Starting from the end of 1Q 2018, totals include 2,300 sqm of equipped space and 1,300 sqm of revenue generating space from Interxion Science Park. 31 December 2017 excludes the impact of Interxion Science Park.

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INTERXION HOLDING NV

NOTES TO CONDENSED CONSOLIDATED INCOME STATEMENTS: SEGMENT INFORMATION

(in €‘000 – except where stated otherwise)

(unaudited)

	Three Months Ended						Year Ended
	Dec-31 2018			Dec-31 2017(a)			Dec-31 2018			Dec-31 2017(a)
Consolidated
Recurring revenue		139,658			123,422			533,083			462,516
Non-recurring revenue		7,243			6,459			28,669			26,786
Revenue		146,901			129,881			561,752			489,302
Net income		7,980			9,744			31,118			39,067
Net income margin		5.4	%		7.5	%		5.5	%		8.0	%
Operating income		31,014			25,752			111,236			98,273
Operating income margin		21.1	%		19.8	%		19.8	%		20.1	%
Adjusted EBITDA		67,708			59,111			257,798			220,961
Gross profit margin		61.1	%		62.4	%		60.9	%		61.1	%
Adjusted EBITDA margin		46.1	%		45.5	%		45.9	%		45.2	%
Total assets		2,262,554			1,702,071			2,262,554			1,702,071
Total liabilities(b)		1,629,134			1,112,410			1,629,134			1,112,410
Capital expenditure, including intangible assets(c)		(131,285	)		(69,659	)		(451,179	)		(256,015	)
France, Germany, the Netherlands, and the UK
Recurring revenue		92,743			81,611			352,692			302,346
Non-recurring revenue		4,553			3,941			17,616			16,291
Revenue		97,296			85,552			370,308			318,637
Operating income		29,546			28,164			117,860			101,120
Operating income margin		30.4	%		32.9	%		31.8	%		31.7	%
Adjusted EBITDA		52,582			48,121			203,796			174,818
Gross profit margin		61.2	%		64.4	%		61.8	%		62.4	%
Adjusted EBITDA margin		54.0	%		56.2	%		55.0	%		54.9	%
Total assets		1,508,967			1,229,960			1,508,967			1,229,960
Total liabilities(b)		311,140			274,076			311,140			274,076
Capital expenditure, including intangible assets(c)		(85,399	)		(47,406	)		(318,595	)		(174,818	)
Rest of Europe
Recurring revenue		46,915			41,811			180,391			160,170
Non-recurring revenue		2,690			2,518			11,053			10,495
Revenue		49,605			44,329			191,444			170,665
Operating income		20,826			18,453			77,057			69,919
Operating income margin		42.0	%		41.6	%		40.3	%		41.0	%
Adjusted EBITDA		30,221			26,056			113,653			99,665
Gross profit margin		68.4	%		66.7	%		66.8	%		66.1	%
Adjusted EBITDA margin		60.9	%		58.8	%		59.4	%		58.4	%
Total assets		520,834			393,644			520,834			393,644
Total liabilities(b)		111,762			78,247			111,762			78,247
Capital expenditure, including intangible assets(c)		(40,577	)		(18,737	)		(113,775	)		(69,832	)
Corporate and other
Operating income		(19,358	)		(20,865	)		(83,681	)		(72,766	)
Adjusted EBITDA		(15,095	)		(15,066	)		(59,651	)		(53,522	)
Total assets		232,753			78,467			232,753			78,467
Total liabilities		1,206,232			760,087			1,206,232			760,087
Capital expenditure, including intangible assets(c)		(5,309	)		(3,516	)		(18,809	)		(11,365	)

(a) As previously reported, certain comparative figures for the three months and twelve months ended 31 December 2017 have been restated compared to the amounts disclosed on Form 6-K furnished on 7 March 2018. For further details, see Note 2 and Note 29 of our 2017 Consolidated Financial Statements included on Form 20-F, filed with the SEC on 30 April 2018.

(b) Certain comparative figures as at 31 December 2017 have been corrected compared to those presented in our 2017 Consolidated Financial Statements included on Form 20-F, filed with the SEC on 30 April 2018. For further details, see section “Correction of 2017 balance sheet figures” in this press release.

(c) Capital expenditure, including intangible assets, represents payments to acquire property, plant and equipment and intangible assets, as recorded in the condensed consolidated statements of cash flows as “Purchase of property, plant and equipment” and “Purchase of intangible assets”, respectively.

16

Press Release, 6 March 2019

INTERXION HOLDING NV

NOTES TO CONDENSED CONSOLIDATED INCOME STATEMENTS: ADJUSTED EBITDA RECONCILIATION

(in €‘000 – except where stated otherwise)

(unaudited)

	Three Months Ended						Year Ended
	Dec-31 2018			Dec-31 2017(a)			Dec-31 2018			Dec-31 2017(a)
Reconciliation to Adjusted EBITDA
Consolidated
Net income		7,980			9,744			31,118			39,067
Income tax expense		7,281			3,681			18,334			14,839
Profit before taxation		15,261			13,425			49,452			53,906
Net finance expense		15,753			12,327			61,784			44,367
Operating income		31,014			25,752			111,236			98,273
Depreciation and amortisation		34,318			29,069			128,954			108,252
Share-based payments		1,512			2,717			12,704			9,929
Income or expense related to the evaluation and execution of potential mergers or acquisitions:
M&A transaction costs(b)		298			1,643			3,235			4,604
Re-assessment of indirect taxes(c)		566			—			1,755			—
Items related to sub-leases on unused data centre sites(d)		—			(70	)		(86	)		(97	)
Adjusted EBITDA(e)		67,708			59,111			257,798			220,961
France, Germany, the Netherlands, and the UK
Operating income		29,546			28,164			117,860			101,120
Depreciation and amortisation		22,867			19,938			84,943			72,721
Share-based payments		169			89			1,079			1,074
Items related to sub-leases on unused data centre sites(d)		—			(70	)		(86	)		(97	)
Adjusted EBITDA(e)		52,582			48,121			203,796			174,818
Rest of Europe
Operating income		20,826			18,453			77,057			69,919
Depreciation and amortisation		8,735			7,544			33,964			29,365
Share-based payments		94			59			877			381
Re-assessment of indirect taxes(c)		566			—			1,755			—
Adjusted EBITDA(e)		30,221			26,056			113,653			99,665
Corporate and Other
Operating income		(19,358	)		(20,865	)		(83,681	)		(72,766	)
Depreciation and amortisation		2,716			1,587			10,047			6,166
Share-based payments		1,249			2,569			10,748			8,474
Income or expense related to the evaluation and execution of potential mergers or acquisitions:
M&A transaction costs(b)		298			1,643			3,235			4,604
Adjusted EBITDA(e)		(15,095	)		(15,066	)		(59,651	)		(53,522	)

(a) As previously reported, certain comparative figures for the three months and twelve months ended 31 December 2017 have been restated compared to the amounts disclosed on Form 6-K furnished on 7 March 2018. For further details, see Note 2 and Note 29 of our 2017 Consolidated Financial Statements included on Form 20-F, filed with the SEC on 30 April 2018.

(b) “M&A transaction costs” are costs associated with the evaluation, diligence and conclusion or termination of merger or acquisition activity. These costs are included in “General and administrative costs”.

(c) This re-assessment relates to years prior to 2018 and is therefore not representative of our current on-going business.

(d) “Items related to sub-leases on unused data centre sites” represents the income on sub-lease of portions of unused data centre sites to third parties. This income is treated as “Other income”.

(e) “Adjusted EBITDA” is a non-IFRS financial measure. See “Non-IFRS Financial Measures” for more information, including why we believe Adjusted EBITDA is useful, and the limitations on the use of Adjusted EBITDA.

17

Press Release, 6 March 2019

INTERXION HOLDING NV

CONDENSED CONSOLIDATED BALANCE SHEET

(in €‘000 – except where stated otherwise)

(unaudited)

	As at
	Dec-31 2018			Dec-31 2017
Non-current assets
Property, plant and equipment		1,721,064			1,342,471
Intangible assets		64,331			60,593
Goodwill		38,900			38,900
Deferred tax assets		21,807			24,470
Other investments		7,906			3,693
Other non-current assets		16,843			13,674
		1,870,851			1,483,801
Current assets
Trade receivables and other current assets		205,613			179,786
Cash and cash equivalents		186,090			38,484
		391,703			218,270
Total assets		2,262,554			1,702,071
Shareholders’ equity(a)(b)
Share capital		7,170			7,141
Share premium(b)		553,425			539,448
Foreign currency translation reserve(a)		3,541			4,180
Hedging reserve, net of tax		(165	)		(169	)
Accumulated profit(a)(b)		69,449			39,061
		633,420			589,661
Non-current liabilities(a)
Borrowings		1,266,813			724,052
Deferred tax liabilities(a)		16,875			19,778
Other non-current liabilities(a)		34,054			23,671
		1,317,742			767,501
Current liabilities(a)
Trade payables and other current liabilities(a)		280,877			229,912
Income tax liabilities		7,185			6,237
Borrowings		23,330			108,760
		311,392			344,909
Total liabilities(a)		1,629,134			1,112,410
Total liabilities and shareholders’ equity		2,262,554			1,702,071

(a) Certain comparative figures as at 31 December 2017 have been corrected compared to those presented in our 2017 Consolidated Financial Statements included on Form 20-F, filed with the SEC on 30 April 2018. For further details on the correction of this error, see section “Correction of 2017 balance sheet figures” in this press release.

(b) As previously reported, certain comparative figures as at 31 December 2017 have been restated compared to the amounts disclosed on Form 6-K furnished on 7 March 2018. For further details on the correction of this error, see Note 2 and Note 29 of our 2017 Consolidated Financial Statements included on Form 20-F, filed with the SEC on 30 April 2018.

18

Press Release, 6 March 2019

INTERXION HOLDING NV

NOTES TO THE CONDENSED CONSOLIDATED BALANCE SHEET: BORROWINGS

(in €‘000 – except where stated otherwise)

(unaudited)

	As at
	Dec-31 2018			Dec-31 2017
Borrowings net of cash and cash equivalents
Cash and cash equivalents		186,090			38,484
4.75% Senior Notes due 2025(a)		1,188,387			—
6.00% Senior Secured Notes due 2020(b)		—			628,141
Mortgages		51,382			53,640
Financial leases		50,374			51,127
Borrowings under our Revolving Facilities		—			99,904
Borrowings excluding Revolving Facility deferred financing costs		1,290,143			832,812
Revolving Facility deferred financing costs(c)		(2,266	)		(204	)
Total borrowings		1,287,877			832,608
Borrowings net of cash and cash equivalents		1,101,787			794,124

(a) €1,200 million 4.75% Senior Notes due 2025 include a premium on additional issuances and are shown after deducting commissions, offering fees and expenses.

(b) €625 million 6.00% Senior Secured Notes due 2020 included a premium on additional issuances and are shown after deducting underwriting discounts and commissions, offering fees and expenses. The Senior Secured Notes were redeemed with a portion of the proceeds from the June 2018 issuance of the 4.75% Senior Notes due 2025.

(c) Deferred financing costs of €2.3 million as of 31 December 2018 were incurred in connection with the €200 million Senior Unsecured Revolving Credit Facility, entered into on 18 June 2018. Deferred financing costs of €0.2 million as at 31 December 2017 were incurred in connection with the €100 million Senior Secured Revolving Facility, which was repaid in 2018.

19

Press Release, 6 March 2019

INTERXION HOLDING NV

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in €‘000 – except where stated otherwise)

(unaudited)

	Three Months Ended						Year Ended
	Dec-31 2018			Dec-31 2017(a)			Dec-31 2018			Dec-31 2017(a)
Net income		7,980			9,744			31,118			39,067
Depreciation and amortisation		34,318			29,069			128,954			108,252
Share-based payments		1,788			2,984			12,270			8,889
Net finance expense		15,753			12,327			61,784			44,367
Income tax expense		7,281			3,681			18,334			14,839
		67,120			57,805			252,460			215,414
Movements in trade receivables and other assets		6,598			(17,013	)		(13,647	)		(30,667	)
Movements in trade payables and other liabilities		3,194			9,473			12,171			24,266
Cash generated from / (used in) operations		76,912			50,265			250,984			209,013
Interest and fees paid(b)		(27,157	)		(1,536	)		(69,005	)		(41,925	)
Interest received		—			3			1			143
Income tax paid		(4,954	)		(3,241	)		(17,126	)		(11,985	)
Net cash flows from / (used in) operating activities		44,801			45,491			164,854			155,246
Cash flows from / (used in) investing activities
Purchase of property, plant and equipment		(125,839	)		(67,198	)		(439,733	)		(247,228	)
Financial investments – deposits		(12,603	)		13			(12,336	)		(324	)
Acquisition Interxion Science Park B.V.		—			—			—			(77,517	)
Purchase of intangible assets		(5,446	)		(2,461	)		(11,446	)		(8,787	)
Loans provided		(880	)		(423	)		(2,988	)		(1,764	)
Net cash flows from / (used in) investing activities		(144,768	)		(70,069	)		(466,503	)		(335,620	)
Cash flows from / (used in) financing activities
Proceeds from exercised options		218			199			1,736			6,969
Proceeds from mortgages		—			9,950			5,969			9,950
Repayment of mortgages		(2,291	)		(8,804	)		(8,335	)		(10,848	)
Proceeds from revolving credit facilities		—			24,746			148,814			129,521
Repayment of revolving facilities		—			—			(250,724	)		(30,000	)
Proceeds 4.75% Senior Notes		—			—			1,194,800			—
Financial lease obligation		(1,170	)		(995	)		(1,170	)		(995	)
Repayment 6.00% Senior Secured Notes		—			—			(634,375	)		—
Interest received at issuance of additional notes		—			—			2,428			—
Transaction costs 4.75% Senior Notes		(426	)		—			(7,122	)		—
Transaction costs 2018 revolving credit facility		20			—			(2,542	)		—
Net cash flows from / (used in) financing activities		(3,649	)		25,096			449,479			104,597
Effect of exchange rate changes on cash		(154	)		(238	)		(224	)		(1,632	)
Net increase / (decrease) in cash and cash equivalents		(103,770	)		280			147,606			(77,409	)
Cash and cash equivalents, beginning of period		289,860			38,204			38,484			115,893
Cash and cash equivalents, end of period		186,090			38,484			186,090			38,484

(a) As previously reported, certain comparative figures for the three months and twelve months ended 31 December 2017 have been restated compared to the amounts disclosed on Form 6-K furnished on 7 March 2018. For further details, see Note 2 and Note 29 of our 2017 Consolidated Financial Statements included on Form 20-F, filed with the SEC on 30 April 2018.

(b) Interest and fees paid is reported net of cash interest capitalised, which is reported as part of “Purchase of property, plant and equipment”.

20

Press Release, 6 March 2019

INTERXION HOLDING NV

NOTES TO CONDENSED CONSOLIDATED INCOME STATEMENTS: ADJUSTED NET INCOME RECONCILIATION

(in €’000 – except per share data and where stated otherwise)

(unaudited)

	Three Months Ended						Year Ended
	Dec-31 2018			Dec-31 2017(a)			Dec-31 2018			Dec-31 2017(a)
Net income – as reported		7,980			9,744			31,118			39,067
Add back
+ Charges related to termination of financing arrangements(b)		—			—			11,171			—
+ Re-assessment of indirect taxes(c)		762			—			2,494			—
+ M&A transaction costs		298			1,643			3,235			4,604
		1,060			1,643			16,900			4,604
Reverse
– Interest capitalised		(1,280	)		(452	)		(4,886	)		(3,057	)
		(1,280	)		(452	)		(4,886	)		(3,057	)
Tax effect of above add backs & reversals		78			(298	)		(2,929	)		(387	)
Adjusted net income		7,838			10,637			40,203			40,227
Reported basic EPS: (€)		0.11			0.14			0.43			0.55
Reported diluted EPS: (€)		0.11			0.14			0.43			0.55
Adjusted basic EPS: (€)		0.11			0.15			0.56			0.57
Adjusted diluted EPS: (€)		0.11			0.15			0.56			0.56

(a) As previously reported, certain comparative figures for the three months and twelve months ended 31 December 2017 have been restated compared to the amounts disclosed on Form 6-K furnished on 7 March 2018. For further details, see Note 2 and Note 29 of our 2017 Consolidated Financial Statements included on Form 20-F, filed with the SEC on 30 April 2018.

(b) These charges relate to the repayment of our 6.00% Senior Secured Notes due 2020 and the termination of our revolving credit facility agreements in 2Q18.

(c) This re-assessment relates to years prior to 2018 and is therefore not representative of our current on-going business.

21

Press Release, 6 March 2019

Correction of 2017 balance sheet figures

During the implementation of IFRS 16 – Leases we identified that for a limited number of data centre leases entered into since 2000, with fixed or minimum annual indexation, the lease costs recognised in prior periods had not been recognised in accordance with IAS 17 – Leases. IAS 17 requires that total minimum lease costs be recognised on a straight-line basis over the term of the relevant lease. The identified error relates to the timing of the recognition of lease costs in the period since 2000 and does not result in an increase in the total costs recognised over the term of the relevant leases nor does it impact cash flows. While the impact of error was inconsequential to and has therefore not been adjusted in the 2017 Income Statement, certain comparative balance sheet figures as at 31 December 2017 have been corrected for the cumulative impact of this error as follows:

	Impact of correction of error
	(€’000)
As at December 31, 2017	As previously reported		Adjustments			As corrected
Total liabilities and shareholders’ equity		1,702,071		—			1,702,071
Other non-current liabilities		15,080		8,591			23,671
Deferred tax liability		21,336		(1,558	)		19,778
Trade payables and other current liabilities		229,878		34			229,912
Total liabilities		1,105,343		7,067			1,112,410
Foreign currency translation reserve		2,948		1,232			4,180
Accumulated profit/(deficit)		47,360		(8,299	)		39,061
Total shareholders’ equity		596,728		(7,067	)		589,661
	Impact of correction of error
	(€’000)
As at December 31, 2017	As previously reported		Adjustments			As corrected
Total liabilities
Consolidated		1,105,343		7,067			1,112,410
France, Germany, the Netherlands, and the UK		267,751		6,325			274,076
Rest of Europe		77,505		742			78,247

22

Press Release, 6 March 2019

INTERXION HOLDING NV

Status of Announced Expansion Projects as at 6 March 2019

with Target Open Dates after 30 September 2018

Market	Project	CAPEX(a)(b) (€ million)		Equipped Space(a) (sqm)		Schedule
Amsterdam	AMS8: Phases 3 – 6		63		5,400	3Q 2018 – 4Q 2018(c)
Amsterdam	AMS10: Phases 1 – 3		195		9,500	4Q 2019 – 3Q 2020(d)
Copenhagen	CPH2: Phases 3 – 5		18		1,500	2Q 2018 – 3Q 2019(e)
Dusseldorf	DUS2: Phase 3		5		500	2Q 2019
Frankfurt	FRA6: Phase 6		5		400	3Q 2018 – 4Q 2018(f)
Frankfurt	FRA13: Phases 1 – 2 New Build		90		4,900	3Q 2018 – 1Q 2019(g)
Frankfurt	FRA14: Phases 1 – 2 New Build		76		4,600	3Q 2019 – 4Q 2019(h)
Frankfurt	FRA15: Phases 1 – 2 New Build		137		4,900	2Q 2020 – 4Q 2020(i)
London	LON3: New Build		35		1,800	1Q 2019 – 3Q 2019(j)
Madrid	MAD3: New Build		44		2,500	2Q 2019(k)
Marseille	MRS2: Phase 2 – 4		72		4,200	2Q 2018 – 3Q 2019(l)
Marseille	MRS3: Phase 1 New Build		79		2,300	4Q 2019
Paris	PAR7.2: Phase B (cont.) – C		47		2,500	2Q 2018 – 1Q 2019(m)
Stockholm	STO5: Phases 2 – 3		19		1,200	1Q 2018 – 2Q 2019(n)
Vienna	VIE2: Phase 7 – 9		94		4,300	4Q 2017 – 2Q 2019(o)
Zurich	ZUR1: Phase 6		10		300	2Q 2019
Zurich	ZUR2: Phase 1 – 2 New Build		93		3,600	1Q 2020 – 3Q 2020(p)
Total			1,082		54,400

(a) CAPEX and Equipped space are approximate and may change. SQM figures are rounded to nearest 100 sqm unless otherwise noted, and totals may not add due to rounding.

(b) CAPEX reflects the total spend for the projects listed at full power and capacity and the amounts shown in the table above may be invested over time.

(c) AMS8: Phases 3 and 4 (2,800 sqm) opened in 3Q 2018 and phases 5 and 6 (1,300 sqm each) opened in 4Q 2018.

(d) AMS10: Phase 1 (2,700 sqm) is scheduled to open in 4Q 2019; phase 2 (4,100 sqm) is scheduled to open in 1Q 2020, phase 3 (2,700 sqm) is scheduled to open in 3Q 2020.

(e) CPH2: Phases 3 and 4 (900 sqm total) opened in 2Q 2018; phase 5 (600 sqm) is scheduled to open in 3Q 2019.

(f) FRA6: Phase 6 part (200 sqm) opened in 3Q 2018, the remaining 200 sqm opened in 4Q 2018.

(g) FRA13: Phase 1 (2,300 sqm) opened in 3Q 2018; phase 2 (2,600 square metres) is scheduled to open in 1Q 2019.

(h) FRA14: Phase 1 (2,400 sqm) is scheduled to open in 3Q 2019 and phase 2 (2,200 square metres) is scheduled to open in 4Q 2019.

(i) FRA15: Phase 1 (2,300 sqm) is scheduled to open in 2Q 2020 and phase 2 (2,600 sqm) is scheduled to open in 4Q 2020.

(j) LON3: Phase 1 (300 sqm) is scheduled to open in 1Q 2019, phase 2 (600 sqm) is scheduled to open in 2Q 2019 and phase 3 (900 sqm) is scheduled to open in 3Q 2019.

(k) MAD3: Capex total for MAD3 include land purchase price.

(l) MRS2: Phase 2 (700 sqm) opened in 2Q 2018 and 3Q; phase 3 (1,100 sqm) is scheduled to open in 1Q 2019 and phase 4 (2,500 sqm) is scheduled to open in 3Q 2019.

(m) PAR7.2: Phase B (cont.) (500 sqm) opened in 2Q 2018; Phase C part (1,500 sqm) opened in 4Q 2018 and the remaining part (500 sqm) is scheduled to open in 1Q 2019.

(n) STO5: Phases 2-3 – 100 sqm opened in 1Q 2018; 300 sqm became operational in 2Q 2018; 800 sqm is scheduled to open in 2Q 2019.

(o) VIE2: 2,300 sqm opened in 4Q 2017 through 3Q 2018; remaining 2,000 sqms are scheduled to open in 2Q 2019.

(p) ZUR2: Phase 1 (1,700 sqm) is scheduled to open in 1Q 2020 and phase 2 (1,900 sqm) is scheduled to open in 3Q 2020.

23

EX-99.2

4Q 2018 Earnings Conference Call NYSE: INXN 6 March 2019 Exhibit 99.2

This document includes forward-looking statements. All statements other than statements of historical fact included in this document regarding our business, financial condition, results of operations and certain of our plans, objectives, assumptions, projections, expectations or beliefs with respect to these items and statements regarding other future events or prospects, are forward-looking statements. These statements include, without limitation, those concerning: our strategy and our ability to achieve it; expectations regarding sales, profitability and growth; plans for the construction of new data centres; our possible or assumed future results of operations; research and development, capital expenditure and investment plans; adequacy of capital; and financing plans. The words “aim,” “may,” “will,” “expect,” “anticipate,” “believe,” “future,” “continue,” “help,” “estimate,” “plan,” “schedule,” “intend,” “should,” “shall” or the negative or other variations thereof as well as other statements regarding matters that are not historical fact, are or may constitute forward-looking statements. In addition, this document includes forward-looking statements relating to our potential exposure to various types of market risks, such as foreign exchange rate risk, interest rate risks and other risks related to financial assets and liabilities. We have based these forward-looking statements on our management’s current view with respect to future events and financial performance. These views reflect the best judgment of our management but involve a number of risks and uncertainties which could cause actual results to differ materially from those predicted in our forward-looking statements and from past results, performance or achievements. Although we believe that the estimates reflected in the forward-looking statements are reasonable, such estimates may prove to be incorrect. 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 those expressed or implied by these forward-looking statements. These factors include, among other things: operating expenses cannot be easily reduced in the short term; inability to utilise the capacity of newly planned data centres and data centre expansions; significant competition; cost and supply of electrical power; data centre industry over-capacity; performance under service level agreements; and delays in remediating the material weakness in internal control over financial reporting and/or making disclosure controls and procedure effective. All forward-looking statements included in this document are based on information available to us on the date of this document. The Company undertakes no obligation to update publicly or revise any forward-looking statement, whether as a result of new information, future events or otherwise, except as may be required by applicable law. All subsequent written and oral forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by the cautionary statements contained throughout this document. This document contains references to certain non-IFRS financial measures, such as Adjusted EBITDA, Recurring revenue, Adjusted net income and Adjusted diluted earnings per share. For definitions of these measures and a reconciliation of these measures to the nearest IFRS measure, please refer to the appendix and the tables attached to our 4Q18 press release. The non-IFRS measure Revenue growth on a constant currency basis is reconciled in the footnotes within this document. Certain financial and other information presented in this document has not been audited or reviewed by our independent auditors. Certain numerical, financial data, other amounts and percentages in this document may not sum due to rounding. In addition, certain figures in this document have been rounded to the nearest whole number. Disclaimer

Strategic & Operational Highlights David Ruberg – Chief Executive Officer

Financial Execution Total revenue up 15% Y/Y Recurring revenue up 15% Y/Y Adjusted EBITDA up 17% Y/Y Adjusted EBITDA margin increased 70 bps Y/Y to 45.9% Capital expenditure of €451 million including intangibles Operational Execution Added 22,300 sqm of new equipped space Y/Y(1): Opened 2 new data centres: BRU2 and FRA13 Opened expansions in 11 markets across 9 countries Added 15,200 sqm of revenue generating space Y/Y(1) Land bank expanded in Amsterdam, Copenhagen, Madrid and Zurich FY 2018 Performance Strong, Broad-Based Demand Drives Expansion and Growth Starting from the end of 1Q 2018, the number of square metres includes 2,300 sqm of equipped space and 1,300 sqm of revenue generating space from Interxion Science Park. The number of square metres in 4Q 2017 excludes the impact of Interxion Science Park.

Financial Execution Total revenue up 13% Y/Y Recurring revenue up 13% Y/Y Adjusted EBITDA up 15% Y/Y Adjusted EBITDA margin increased 60 bps Y/Y to 46.1% Capital expenditure of €131 million including intangibles Operational Execution Added 4,500 sqm of new equipped space Opened expansions in Amsterdam, Frankfurt and Paris Installed 3,800 sqm of revenue generating space Utilisation rate 79% at year end New data centres announced in Frankfurt (FRA15) and Marseille (MRS3) 4Q 2018 Performance Continued Strong Demand and Disciplined Execution

4Q Revenue €146.9 million Up 13% Y/Y and 3% Q/Q 4Q Recurring revenue €139.7 million Up 13% Y/Y and 4% Q/Q 95% of total revenue 4Q Adjusted EBITDA €67.7 million Up 15% Y/Y and 3% Q/Q 4Q Adjusted EBITDA margin 46.1% 60 bps increase Y/Y 4Q 2018 Financial Highlights Adjusted EBITDA & Margin (€ millions) 45.5% 46.1% Margin 45.5% Revenue (€ millions) Non- recurring revenue Recurring revenue 13% Revenue Growth and 15% Adjusted EBITDA Growth Y/Y 129.9 133.8 45.7% 138.8 46.3% 142.2 146.9

Equipped space of 144,800 sqm 4,500 sqm added in the quarter Revenue generating space of 115,000 sqm 3,800 sqm installed in the quarter Utilisation rate of 79% 4Q 2018 Operational Highlights Equipped & Revenue Generating Space(1) (1,000’s sqm) Available Equipped space Revenue generating space 80% 79% 81% Utilisation 81% 122.5 High Utilisation Rate Maintained With 15% Growth Y/Y in Revenue Generating Space 128.9 79% Starting from the end of 1Q 2018, the number of square metres includes 2,300 sqm of equipped space and 1,300 sqm of revenue generating space from Interxion Science Park. The number of square metres in 4Q 2017 excludes the impact of Interxion Science Park. 132.6 140.3 144.8

Capacity Expansion Across Footprint Note: Totals may not sum due to rounding. As of 6 March 2019, Capex and Equipped Space are approximate and may change. Capex reflects the total spend for the listed project at full power and capacity, and the amounts shown in the table above may be invested over the duration of more than one fiscal year. Announced Capacity Additions with Opening Dates after 30 September 2018(1) Market Data Centre Project Project CapEx (€ millions) Equipped Space (sqm) Schedule Project Opened(1) Amsterdam AMS8 Phases 3-6 63 5,400 5,400 3Q18 – 4Q18 Amsterdam AMS10 Phases 1-3 195 9,500 0 4Q19 – 3Q20 Copenhagen CPH2 Phases 3-5 18 1,500 900 2Q18 – 3Q19 Dusseldorf DUS2 Phase 3 5 500 0 2Q19 Frankfurt FRA6 Phase 6 5 400 400 3Q18 – 4Q18 Frankfurt FRA13 Phases 1-2 New Build 90 4,900 2,300 3Q18 – 1Q19 Frankfurt FRA14 Phases 1-2 New Build 76 4,600 0 3Q19 – 4Q19 Frankfurt FRA15 Phases 1-2 New Build 137 4,900 0 2Q20 – 4Q20 London LON3 New Build 35 1,800 0 1Q19 – 3Q19 Madrid MAD3 New Build 44 2,500 0 2Q19 Marseille MRS2 Phases 2-4 72 4,200 700 2Q18 – 3Q19 Marseille MRS3 Phase 1 New Build 79 2,300 0 4Q19 Paris PAR7.2 Phase B (cont.) & C 47 2,500 2,000 2Q18 – 1Q19 Stockholm STO5 Phases 2-3 19 1,200 400 1Q18 – 2Q19 Vienna VIE2 Phases 7-9 94 4,300 2,300 4Q17 – 2Q19 Zurich ZUR1 Phase 6 10 300 0 2Q19 Zurich ZUR2 Phase 1-2 New Build 93 3,600 0 1Q20 – 3Q20 Capacity additions completed in 4Q 2018 include: AMS8: ~2,700 sqm PAR7: ~1,500 sqm FRA6: ~300 sqm Three new data centres announced since the end of 3Q 2018: FRA15: 4,900 sqm under construction MRS3: 2,300 sqm under construction ZUR2: 3,600 sqm under construction Land acquired in Copenhagen and Zurich during 4Q Expansions totaling 40,000 sqm scheduled to open in 2019-2020 Aggregate capacity expansion of 28%

38% 31% 31% Communities of Interest Deliver Significant Customer Value Connectivity Platforms Enterprises

Financial Highlights John Doherty – Chief Financial Officer

4Q 2018 Results Recurring revenue, Non-recurring revenue, Adjusted EBITDA, Adjusted EBITDA margin, Adjusted net income, and Adjusted earnings per share (diluted) are non-IFRS figures intended to adjust for certain items. Full definitions can be found in the “Definitions” section of this presentation. Reconciliations of net income to Adjusted EBITDA can be found in the financial tables later in the appendix of this presentation. Reconciliations of net income to Adjusted net income can be found in the tables attached to our 4Q18 press release. As previously reported, certain comparative figures for the three months and twelve months ended 31 December 2017 have been restated compared to the amounts disclosed on Form 6-K furnished on 7 March 2018. For further details, see Note 2 and Note 29 of our 2017 Consolidated Financial Statements included on Form 20-F, filed with the SEC on 30 April 2018. € millions (except per share amounts) 4Q 2017 3Q 2018 4Q 2018 4Q 2018 vs. 4Q 2017 4Q 2018 vs. 3Q 2018 Recurring revenue(1) 123.4 134.8 139.7 13% 4% Non-recurring revenue(1) 6.5 7.4 7.2 12% (3%) Revenue 129.9 142.2 146.9 13% 3% Gross profit 81.0 86.3 89.7 11% 4% Gross profit margin 62.4% 60.7% 61.1% (130 bps) 40 bps Adjusted EBITDA(1) 59.1 65.8 67.7 15% 3% Adjusted EBITDA margin(1) 45.5% 46.3% 46.1% 60 bps (20 bps) Net income(2) 9.7 10.9 8.0 (18%) (27%) EPS (diluted)(2) €0.14 €0.15 €0.11 (19%) (27%) Adjusted net income(1)(2) 10.6 11.6 7.8 (26%) (33%) Adjusted EPS (diluted)(1)(2) €0.15 €0.16 €0.11 (27%) (33%) Revenue growth of 13% Y/Y and 3% Q/Q Recurring revenue up 13% Y/Y and 4% Q/Q Recurring ARPU at €412 Gross profit up 11% Y/Y and 4% Q/Q Adjusted EBITDA up 15% Y/Y and 3% Q/Q Adjusted EBITDA margin increased 60 bps Y/Y to 46.1%

4Q 2018 Reporting Segment Analysis Revenue up 12% Y/Y, 2% Q/Q Recurring revenue up 12% Y/Y, 3% Q/Q Adjusted EBITDA up 16% Y/Y, 5% Q/Q Adjusted EBITDA margin at 60.9% Strength in Austria, Denmark and Sweden Note: This analysis excludes “Corporate & Other” segment. Totals may not sum due to rounding. Revenue up 14% Y/Y, 4% Q/Q Recurring revenue up 14% Y/Y, 4% Q/Q Adjusted EBITDA up 9% Y/Y, 1% Q/Q Adjusted EBITDA margin at 54.0% Strength in Germany and France Revenue Adjusted EBITDA Adjusted EBITDA margin (€ millions) 56.2% 54.6% 56.2% 58.8% 60.0% 57.4% France, Germany, Netherlands & UK 55.4% 59.0% 54.0% 60.9% Rest of Europe Strong Revenue Growth and Adjusted EBITDA Margins in Both Geographic Segments

Revenue grew 15% Y/Y Gross profit grew 15% Y/Y Gross profit margin decreased 20 bps to 60.9% Adjusted EBITDA grew 17% Y/Y Adjusted EBITDA margin increased 70 bps to 45.9% 2018 Full Year Results Recurring revenue, Non-recurring revenue, Adjusted EBITDA, Adjusted EBITDA margin, Adjusted net income, and Adjusted earnings per share (diluted) are non-IFRS figures intended to adjust for certain items. Full definitions can be found on the “Definitions” section in this slide deck. Reconciliations of Adjusted EBITDA and Adjusted net income to Net income can be found in the financial tables later in the appendix of this slide deck. As previously reported, certain comparative figures for the three months and twelve months ended 31 December 2017 have been restated compared to the amounts disclosed on Form 6-K furnished on 7 March 2018. For further details, see Note 2 and Note 29 of our 2017 Consolidated Financial Statements included on Form 20-F, filed with the SEC on 30 April 2018. € millions (except per share amounts) 2017 2018 2018 vs. 2017 Recurring revenue(1) 462.5 533.1 15% Non-recurring revenue(1) 26.8 28.7 7% Revenue 489.3 561.8 15% Gross profit 298.8 342.3 15% Gross profit margin 61.1% 60.9% (20 bps) Adjusted EBITDA(1) 221.0 257.8 17% Adjusted EBITDA margin(1) 45.2% 45.9% 70 bps Net income(2) 39.1 31.1 (20%) EPS (diluted)(2) €0.55 €0.43 (21%) Adjusted net income(1)(2) 40.2 40.2 0% Adjusted EPS (diluted)(1)(2) €0.56 €0.56 (1%)

IFRS16 – Lease Accounting Metric Significant Considerations Expected Impact Revenue Certain components of revenue are recognised as lease revenue. Negligible impact on revenue metrics Adjusted EBITDA Properties and other assets leased under operating lease agreements are recognised as right of use assets and lease liabilities, reducing rent expense and increasing interest expense and depreciation charges. Approx. 600bps increase to Adjusted EBITDA margin in 2018 Leverage Recognising right of use assets and lease liabilities for data centres leased under operating leases increases the level of reported third party debt resulting in an increase in reported gross and net leverage. Pro-forma impact(1) as at 31 December 2018: Gross leverage: +0.8x Net leverage: +0.9x IFRS16 adopted from 1 January 2019 Operating leases and financial leases are now treated the same IFRS16 does not impact Interxion’s financial covenant reporting on debt or revolving credit facilities More comparable with our U.S. peer group Assuming IFRS16 implemented from 1 January 2018.

Disciplined Investments(1) 78% 79% 81% SQM Utilisation 76% Focused Capital Expenditures To Meet Strong Customer Demand 71% of capex invested in Big 4 93% of capex invested in discretionary expansion projects Maintenance capex at 4% of total revenue Inclusive of Intangibles. Totals may not sum due to rounding. 79%

€200 million RCF undrawn Capacity increased to €300 million in Q1 2019 5.0% blended cost of debt 4Q 2018 LTM Cash ROGIC 10% Leverage: 5.1x gross leverage(4) 4.3x net leverage(5) Strong Balance Sheet Total Borrowings = 4.75% Senior Notes due 2025 (2017: 6.00% Senior Secured Notes due 2020), shown including the impact of premiums, commissions, offering fees and expenses + Mortgages + Financial Leases + Revolving facilities borrowings + Other Borrowings – Revolving facility deferred financing costs. As previously reported, certain comparative figures as at 31 December 2017 have been restated compared to the amounts disclosed on Form 6-K furnished on 7 March 2018. For further details, see Note 2 and Note 29 of our 2017 Consolidated Financial Statements included on Form 20-F, filed with the SEC on 30 April 2018. Certain comparative figures as at 31 December 2017 have been corrected compared to those presented in our 2017 Consolidated Financial Statements included on Form 20-F, filed with the SEC on 30 April 2018. For further details on the correction of this error, see section "Correction of 2017 balance sheet figures" in our 4Q 18 press release. Gross Leverage Ratio =  (4.75% Senior Notes due 2025 (2017: 6.00% Senior Secured Notes due 2020) at face value + Mortgages + Financial Leases + Revolving facilities borrowings + Other Borrowings)  /  LTM Adjusted EBITDA. Net Leverage Ratio = (4.75% Senior Notes due 2025 (2017: 6.00% Senior Secured Notes due 2020) at face value + Mortgages + Financial Leases + Revolving facilities balance + Other Borrowings – Cash & Cash Equivalents)  /  LTM Adjusted EBITDA. € millions 31-Dec-18 31-Dec-17 Cash & Cash Equivalents 186.1 38.5 Total Borrowings(1) 1,287.9 832.6 Shareholders Equity(2)(3) 633.4 589.7 Gross Leverage Ratio(4) 5.1x 3.8x Net Leverage Ratio(5) 4.3x 3.6x Increased Liquidity to Support Growing Expansion Program

37 fully built-out(1) data centres(2) Space fully equipped Some power upgrades yet to come As of 1 January 2017 91,800 sqm of equipped space 82% utilisation 5% LTM constant currency recurring revenue growth 23% cash return Disciplined Investments Drive Strong Returns Q4 2018 LTM Returns (€ millions) Fully Built-Out Data Centre: a data centre for which materially all equippable space is equipped as at 1 January 2017. However, future power upgrades can further increase the capacity of a fully built out data centre. 37 Fully Built-Out Data Centres as at 1 January 2017: AMS1, AMS3, AMS4, AMS5, AMS6, AMS7, BRU1, CPH1, DUB1, DUB2, FRA1, FRA2, FRA3, FRA4, FRA5, FRA6, FRA7, FRA8, FRA9, FRA10, DUS1, DUS2, LON1, LON2, MAD1, MAD2, PAR1, PAR2, PAR3, PAR4, PAR5, PAR6, STO1, STO2, STO3, STO4 and VIE1. Represents total cumulative investments in Data Centre Assets, including freehold land and buildings, infrastructure and equipment and Intangible assets including goodwill, as at 31 December 2018. Consistently Attractive Cash Returns from Fully Built-Out(1) Data Centres

Business Commentary Outlook & Concluding Remarks David Ruberg – Chief Executive Officer

Different Levels of Adoption Maturity Colocation Adoption Time Enterprises Platforms Connectivity Hybrid Cloud Data Explosion Cloud Migration & Digital Transformation Global Cloud & Content Roll Out Data Traffic Growth

Guidance for 2019 (IFRS 16) Revenue €632m – €647m Adjusted EBITDA(1) €324m – €334m Capital Expenditures €570m – €600m Adjusted EBITDA is a non-IFRS figure intended to adjust for certain items. The definition of Adjusted EBITDA can be found in the “Definitions” section in this slide deck. Interxion does not provide an outlook for an IFRS profitability metric. Consequently, the company is unable to reconcile the outlook for Adjusted EBITDA.

Questions & Answers

Appendix

A leading carrier & cloud neutral data centre operator across Europe Interxion Overview 51 Data Centres in Operation 13 Cities 11 Countries 700+ Connectivity Providers 20+ Internet Exchanges 500+ Platform Providers 2,000+ Customers 700+ Employees Note: Figures as of 31 December 2018.

Track Record Of Execution Note: Includes Interxion Science Park as of 24 February 2017. CAGR calculated as 2018 vs 2010. Adjusted EBITDA margin calculated as Adjusted EBITDA divided by Revenue. CAGR(1) = 13% CAGR(1) = 16% 38% 40% 42% 43% 43% 44% 45% 45% 46% 21% 17% 13% 11% 11% 13% 9% 16% 15% 49 Consecutive Quarters of Revenue and Adjusted EBITDA Growth YOY Growth 26% 23% 18% 15% 11% 17% 11% 16% 17% Adj. EBITDA Margin(2) YOY Growth

Illustrative ARPU Development ARPU increases over time as IT workloads increase: Customers initially contract for space, connectivity and modest power reservation(1) As workloads increase, larger power reservation fees and cross-connects are required and energy consumption increases Revenue grows from space, cross-connects, power reservation and energy consumption over time As data centres fill with customers: Revenue mix initially tilted toward space As space becomes more fully utilised, revenue growth from power reservation and energy consumption can continue Power reservation is the fee for infrastructure power (cooling, power distribution, etc.). Customer ARPU Development Data Centre Recurring Revenue Development Power Reservation & Energy Consumption Cross-Connects Revenue Develops Over Time Driven by Power Reservation and Energy Consumption Space Installed

Historical Financial Results Note: Figures rounded to nearest net €0.1 Million. Totals may not sum due to rounding. Includes €0.8 million, €0.6 million, €1.6 million, €1.6 million, €1.2 million, €1.0 million, €0.7 million, €0.3 million and €2.4 million of M&A transaction cost in 1Q17, 2Q17, 3Q17, 4Q17, 1Q18, 2Q18, 3Q18, 4Q18 and full year 2016 respectively. Quarterly and annual net income results for 2016 and 2017 are restated. For further details, see Note 2 and Note 29 of our 2017 Consolidated Financial Statements included on Form 20-F, filed with the SEC on 30 April 2018, and Note 12 of our Condensed Consolidated Interim Financial Statements included on Form 6-K, filed with the SEC on 1 November 2018. Includes €11.2 million of one-time charge related to termination of financing arrangements. Includes gain on sale of financial asset. € millions (except as noted) 2017 2018 2016 2017 2018 1Q 2Q 3Q 4Q 1Q 2Q 3Q 4Q FY FY FY Recurring revenue 108.3 113.4 117.4 123.4 127.0 131.7 134.8 139.7 400.0 462.5 533.1 Non-recurring revenue 5.7 7.4 7.3 6.5 6.9 7.1 7.4 7.2 21.8 26.8 28.7 Total revenue 113.9 120.8 124.6 129.9 133.8 138.8 142.2 146.9 421.8 489.3 561.8 Gross profit 69.9 72.9 75.0 81.0 81.1 85.1 86.3 89.7 259.2 298.8 342.3 Gross profit margin 61.3% 60.3% 60.2% 62.4% 60.6% 61.3% 60.7% 61.1% 61.5% 61.1% 60.9% Adj EBITDA 51.3 54.3 56.2 59.1 60.9 63.4 65.8 67.7 190.9 221.0 257.8 Adj EBITDA margin 45.1% 45.0% 45.1% 45.5% 45.5% 45.7% 46.3% 46.1% 45.3% 45.2% 45.9% Net income / (loss) 10.3(1) 9.7(1) 9.4(1) 9.7(1) 11.7(1) 0.6(1)(2) 10.9(1) 8.0(1) 38.3(1)(3) 39.1(1) 31.1(1) CapEx paid 54.8 56.4 75.2 69.7 96.2 120.5 103.2 131.3 250.9 256.0 451.2 Expansion / upgrade 49.0 46.0 69.7 60.2 90.1 109.6 99.7 120.7 228.8 224.8 420.0 Maintenance & other 4.0 7.4 4.0 7.0 4.2 7.9 2.5 5.2 13.2 22.4 19.7 Intangibles 1.8 3.0 1.4 2.5 2.0 3.0 1.0 5.4 8.9 8.8 11.4 Cash generated from operations 63.0(1) 40.6(1) 55.2(1) 50.3(1) 58.1(1) 55.1(1) 60.9(1) 76.9(1) 183.4(1) 209.0(1) 251.0(1) Gross PP&E 1.728.5 1,778.3 1,844.6 1,935.1 2,020.8 2,139.5 2,257.4 2,427.3 1,651.1 1,935.1 2,427.3 Gross intangible assets 113.3 114.8 114.9 117.0 119.7 122.5 123.4 128.8 42.3 117.0 128.8 Gross Goodwill 40.2 39.4 38.9 38.9 38.9 38.9 38.9 38.9 ‒ 38.9 38.9 LTM Cash ROGIC 11% 11% 11% 11% 10% 10% 10% 10% 11% 11% 10%

Historical Reporting Segment Financial Results Note: Figures rounded to nearest net €0.1 Million. Totals may not sum due to rounding. € millions (except as noted) 2017 2018 2016 2017 2018 1Q 2Q 3Q 4Q 1Q 2Q 3Q 4Q FY FY FY Big 4 Recurring revenue 70.0 74.2 76.6 81.6 83.5 87.3 89.2 92.7 256.0 302.3 352.7 Non-recurring revenue 3.4 4.7 4.3 3.9 4.5 4.2 4.4 4.6 13.8 16.3 17.6 Total revenue 73.4 78.9 80.8 85.6 87.9 91.5 93.6 97.3 269.8 318.6 370.3 Gross profit margin 61.9% 62.0% 61.0% 64.4% 61.1% 63.2% 61.9% 61.2% 62.6% 62.4% 61.8% Adj EBITDA 40.2 43.1 43.4 48.1 48.0 51.4 51.8 52.6 148.2 174.8 203.8 Adj EBITDA margin 54.7% 54.7% 53.7% 56.2% 54.6% 56.2% 55.4% 54.0% 54.9% 54.9% 55.0% Rest of Europe Recurring revenue 38.3 39.2 40.8 41.8 43.5 44.4 45.6 46.9 144.0 160.2 180.4 Non-recurring revenue 2.3 2.7 3.0 2.5 2.4 2.9 3.0 2.7 8.1 10.5 11.1 Total revenue 40.6 42.0 43.8 44.3 45.9 47.3 48.6 49.6 152.0 170.7 191.4 Gross profit margin 66.8% 65.2% 65.8% 66.7% 67.6% 65.0% 66.4% 68.4% 65.9% 66.1% 66.8% Adj EBITDA 23.7 24.0 25.9 26.1 27.6 27.2 28.7 30.2 88.2 99.7 113.7 Adj EBITDA margin 58.3% 57.3% 59.1% 58.8% 60.0% 57.4% 59.0% 60.9% 58.0% 58.4% 59.4% Corporate & Other Adj EBITDA (12.5) (12.8) (13.1) (15.1) (14.7) (15.1) (14.8) (15.1) (45.5) (53.5) (59.7)

Historical Operating Metrics(1) Interxion Science Park was acquired in February 2017. One data centre added to “Data centres in operation” at 1Q 2017. Starting from 1Q18, totals include 2,300 sqm of equipped space and 1,300 sqm of revenue generating space from Interxion Science Park. All figures at the end of the period, except as noted. Maximum equippable customer power includes the announced maximum equippable customer power from current and announced data centres as of the date of each quarter’s respective report. Utilisation as of the end of the reporting period. Space figures in square metres(2) Recurring ARPU in € Customer Power in MW(2) 2016 2017 2018 1Q 2Q 3Q 4Q 1Q 2Q 3Q 4Q 1Q 2Q 3Q 4Q Equipped space 101,600 104,200 107,800 110,800 114,100 117,000 118,900 122,500 128,900 132,600 140,300 144,800 Equipped space added 400 2,600 3,600 3,000 3,300 2,900 1,900 3,600 4,000 3,700 7,700 4,500 Revenue generating space 80,400 81,600 84,100 87,200 89,800 95,000 97,100 99,800 104,100 106,200 111,200 115,000 RGS added 1,300 1,200 2,500 3,100 2,600 5,200 2,100 2,700 2,900 2,100 5,000 3,800 Recurring ARPU 406 409 402 403 405 403 401 411 412 418 413 412 Utilisation (%)(3) 79% 78% 78% 79% 79% 81% 82% 81% 81% 80% 79% 79% Equipped customer power 120 123 129 131 136 142 146 160 166 169 185 199 Maximum equippable customer power 178 178 187 187 195 203 223 225 241 276 278 314 Data centres in operation 41 42 42 44 45 45 48 49 50 50 51 51

Scheduled Equipped Space Additions Figures rounded to nearest net 100 sqm for each country unless otherwise noted. Totals may not sum due to rounding. Excludes acquisition of Interxion Science Park, which added approximately 2,300 sqm from 1Q17. Future expansion additions based on announced schedule, which is subject to change; additions scheduled for the first half of the year are noted in the second quarter and additions scheduled for the second half of the year are noted in the fourth quarter. Space figures in square metres(1) 2017(2) 2018 2019E(3) 2020E(3) 1Q 2Q 3Q 4Q 1Q 2Q 3Q 4Q 1QE 2QE 3QE 4QE 1QE 2QE 3QE 4QE Big 4 France 1,600 1,500 100 ‒ ‒ 900 600 1,500 1,600 ‒ 2,500 2,300 ‒ ‒ ‒ ‒ Germany ‒ ‒ 1,100 2,400 2,400 ‒ 2,400 300 2,600 500 2,400 2,200 ‒ 2,300 ‒ 2,600 Netherlands 1,300 ‒ ‒ ‒ ‒ ‒ 3,200 2,700 ‒ ‒ ‒ 2,700 4,100 ‒ 2,700 ‒ UK ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ 300 600 900 ‒ ‒ ‒ ‒ ‒ Subtotal 3,000 1,500 1,200 2,400 2,400 800 6,200 4,500 4,500 1,100 5,800 7,200 4,100 2,300 2,700 2,600 Rest of Europe Austria ‒ 1,100 ‒ 300 400 400 1,200 ‒ ‒ 2,000 ‒ ‒ ‒ ‒ ‒ ‒ Belgium ‒ ‒ ‒ ‒ 1,100 ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ Denmark 300 300 ‒ ‒ ‒ 900 ‒ ‒ ‒ ‒ 600 ‒ ‒ ‒ ‒ ‒ Ireland ‒ ‒ ‒ ‒ ‒ 1,200 ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ Spain ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ 2,500 ‒ ‒ ‒ ‒ ‒ ‒ Sweden 100 ‒ 300 200 100 300 ‒ ‒ ‒ 800 ‒ ‒ ‒ ‒ ‒ ‒ Switzerland ‒ ‒ 400 700 100 ‒ 200 ‒ ‒ 300 ‒ ‒ 1,700 ‒ 1,900 ‒ Subtotal 400 1,400 700 1,200 1,700 2,800 1,400 ‒ ‒ 5,600 600 ‒ 1,700 ‒ 1,900 ‒ Total additional equipped space 3,300 2,900 1,900 3,600 4,000 3,700 7,700 4,500 4,500 6,700 6,400 7,200 5,800 2,300 4,600 2,600 24,800 sqm in 2019E 19,900 sqm in 2018 11,700 sqm in 2017 15,300 sqm in 2020E

Space Analysis by Country Note: Figures rounded to nearest net 100 sqm for each country unless otherwise noted. Totals may not sum due to rounding. As of 31 December 2018. Expansions announced after the end of the quarter are excluded. Maximum Equippable Space (incl DC’s under construction) = Equipped Space + Under Construction Space + Unequipped Space. Future expansion additions based on announced schedules only, which is subject to change; excludes expansions announced after the end of the period. Excludes land bank and undeveloped properties. Space figures in square metres Data Centres in Operation / under Construction Maximum Equippable Space in Country(1) (incl DC’s under construction) Equipped Space in Country Equipped Space Under Construction in Country(2) Unequipped Space Available for Development(3) Big 4 France 10 40,000 26,300 6,200 7,500 Germany 17 50,200 32,800 12,600 4,800 Netherlands 9 45,400 31,000 9,500 4,900 UK 3 8,700 6,900 1,800 0 Subtotal 39 144,300 97,000 30,100 17,200 Rest of Europe Austria 2 13,300 11,200 2,000 0 Belgium 2 6,200 6,200 0 0 Denmark 2 6,400 5,800 600 0 Ireland 3 5,800 5,800 0 0 Spain 3 8,200 5,700 2,500 0 Sweden 5 6,800 5,800 800 200 Switzerland 1 7,600 7,300 300 0 Subtotal 18 54,300 47,800 6,200 200 Total 57 198,600 144,800 36,400 17,400

Pan-European Data Centre Portfolio 18 Location Owned / Leased Build Out Status(1) Maximum Equippable Space (sqm)(2) Location Owned / Leased Build Out Status(1) Maximum Equippable Space (sqm)(2) Big 4 France Netherlands MRS1 Owned Expanding 6,400 AMS1 Leased Fully 600 MRS2 Leased Expanding 4,500 AMS3 Owned Fully 3,000 MRS3 Leased Under Construction 7,100 AMS4 Leased Fully NM (4) PAR1 Leased Fully 1,400 AMS5 Leased Fully 4,300 PAR2 Leased Fully 2,900 AMS6 Owned Fully 4,400 PAR3 Owned Fully 1,900 AMS7 Finance Lease(3) Fully 7,600 PAR4 Leased Fully 1,300 AMS8 Finance Lease Expanding 8,200 PAR5 Owned Fully 4,000 AMS9 Owned Expanding 2,800 AMS10 Owned Under Construction 14,400 PAR6 Leased Fully 1,300 UK PAR7 Finance Lease (3) Expanding 9,300 LON1 Leased Fully 5,400 LON2 Leased Fully 1,500 LON3 Leased Under Construction 1,800 Germany DUS1 Leased Fully 3,300 FRA7 Leased Fully 1,500 DUS2 Leased Fully 1,800 FRA8 Owned Fully 3,700 FRA1 Leased Fully 500 FRA9 Leased Fully 800 FRA2 Leased Fully 1,100 FRA10 Owned Fully 4,800 FRA3 Leased Fully 2,200 FRA11 Owned Expanding 4,800 FRA4 Leased Fully 1,400 FRA12 Leased Expanding 1,100 FRA5 Leased Fully 1,700 FRA13 Owned Expanding 4,900 FRA6 Leased Fully 2,600 FRA14 Owned Under Construction 4,600 FRA15 Owned Under Construction 9,600 ROE Austria   Spain       VIE1 Owned Fully 4,700 MAD1 Leased Fully 4,000 VIE2 Owned Expanding 8,500 MAD2 Leased Fully 1,700 MAD3 Owned Under Construction 2,500 Belgium     Sweden     BRU1 Owned Fully 5,100 STO1 Leased Fully 1,900 BRU2 Leased Expanding 1,100 STO2 Leased Fully 1,200 Denmark     STO3 Leased Fully 900 CPH1 Leased Fully 3,700 STO4 Leased Fully 1,100 CPH2 Owned Expanding 2,600 STO5 Leased Expanding 1,700 Ireland     Switzerland     DUB1 Leased Fully 1,100 ZUR1 Leased Expanding 7,600 DUB2 Leased Fully 2,300 DUB3 Owned Expanding 2,300 Total 198,600 Note: Totals may not sum due to rounding. Built Out Status as of 1 January 2017, consistent with slide 16 As of 31 December 2018. Purchase options have been exercised, though not yet closed. Maximum equippable space for AMS4 is included in the maximum equippable space of AMS1. Totals: # Sqm %         Owned 19 95,100 48% Finance Lease 3 25,100 13% Operating Lease 35 78,400 39% Total 57 198,600 100%

Non-IFRS Reconciliation Note: Figures rounded to nearest net €0.1 million. Totals may not sum due to rounding. Net income and share-based payments for 2014, 2015, 2016 and 2017 are restated. For further details, see Note 2 and Note 29 of our 2017 Consolidated Financial Statements included on Form 20-F, filed with the SEC on 30 April 2018, and note 12 of our Condensed Consolidated Interim Financial Statements included on Form 6-K, filed with the SEC on 1 November 2018. Includes €31.0 million in one-off charges related to debt refinancing. Includes €11.2 million of one-off charges related to termination of financing arrangements. This re-assessment relates to years prior to 2018 and is therefore not representative of our current ongoing business. € millions (except as noted) 2010 2011 2012 2013 2014 2015 2016 2017 2018 1Q 2Q 3Q 4Q 1Q 2Q 3Q 4Q Net income(1) 14.7 25.5 31.6 6.9(2) 34.4 46.7 38.3 10.3 9.7 9.4 9.7 11.7 0.6(3) 10.9 8.0 Income tax expense / (benefit) 2.5 9.7 15.8 6.1 15.5 17.9 16.4 3.3 3.7 4.1 3.7 3.8 2.8 4.4 7.3 Profit / (loss) before taxation 17.2 35.2 47.4 13.0 49.9 64.6 54.7 13.6 13.4 13.5 13.4 15.5 3.4 15.3 15.3 Net finance expense 29.5 22.9 17.8 57.5(2) 27.9 29.0 36.3 10.3 10.9 10.8 12.3 11.4 22.9(3) 11.7 15.8 Operating profit 46.7 58.1 65.2 70.5 77.8 93.6 91.0 23.8 24.3 24.4 25.8 26.9 26.3 27.1 31.0 Depreciation, amortisation and impairments 31.1 35.6 44.0 57.6 62.2 78.3 89.8 24.2 27.2 27.8 29.1 29.6 32.2 32.9 34.3 Share-based payments(1) 1.7 2.6 5.4 4.2 7.2 9.0 7.9 2.6 2.2 2.4 2.7 3.3 3.9 3.9 1.5 Increase/(decrease) in provision for onerous lease contracts 0.2 0.0 0.8 ‒ (0.8) (0.2) ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ IPO transaction costs ‒ 1.7 ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ M&A transaction break fee income ‒ ‒ ‒ ‒ ‒ (20.9) ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ M&A transaction costs ‒ ‒ ‒ ‒ 0.3 11.9 2.4 0.8 0.6 1.6 1.6 1.2 1.0 0.7 0.3 Re-assessment of indirect taxes(4) ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ 1.2 0.6 Income from sub-leases on unused data centre sites (0.4) (0.4) (0.4) (0.3) (0.4) (0.4) (0.1) (0.0) ‒ ‒ (0.1) (0.1) ‒ ‒ ‒ Increase/(decrease) in provision for site restoration ‒ ‒ ‒ ‒ ‒ ‒ (0.2) ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ Adjusted EBITDA 79.2 97.6 115.0 131.9 146.4 171.2 190.8 51.3 54.3 56.2 59.1 60.9 63.4 65.8 67.7

Reconciliation to Segment Adjusted EBITDA Note: Figures rounded to nearest net €0.1 million. Totals may not sum due to rounding. This re-assessment relates to years prior to 2018 and is therefore not representative of our current ongoing business. Operating profit/(loss) and share-based payments for 2017 have been restated. For further details, see Note 2 and Note 29 of our 2017 Consolidated Financial Statements included on Form 20-F, filed with the SEC on 30 April 2018, and note 12 of our Condensed Consolidated Interim Financial Statements included on Form 6-K, filed with the SEC on 1 November 2018. € millions 2017 2018 1Q 2Q 3Q 4Q 1Q 2Q 3Q 4Q BIG 4 Operating profit 24.0 24.8 24.2 28.2 27.6 30.3 30.4 29.5 Depreciation, amortisation and impairments 15.9 18.1 18.8 19.9 20.1 20.8 21.2 22.9 Share-based payments 0.3 0.2 0.4 0.1 0.3 0.3 0.3 0.2 Income from sub-leases on unused data centre sites ‒ ‒ ‒ (0.1) (0.1) ‒ ‒ ‒ Adjusted EBITDA 40.2 43.1 43.4 48.1 48.0 51.4 51.8 52.6   ROE Operating profit 16.7 16.4 18.3 18.5 19.6 18.6 18.0 20.8 Depreciation, amortisation and impairments 7.0 7.4 7.5 7.5 7.7 8.2 9.3 8.7 Share-based payments (0.0) 0.2 0.1 0.1 0.2 0.3 0.3 0.1 Re-assessment of indirect taxes(1) ‒ ‒ ‒ ‒ ‒ ‒ 1.2 0.6 Adjusted EBITDA 23.7 24.0 25.9 26.1 27.6 27.2 28.7 30.2   CORPORATE & OTHER Operating profit/(loss)(2) (16.9) (16.9) (18.1) (20.9) (20.4) (22.7) (21.3) (19.4) Depreciation, amortisation and impairments 1.3 1.7 1.5 1.6 1.7 3.2 2.5 2.7 Share-based payments(2) 2.3 1.8 1.9 2.5 2.8 3.4 3.4 1.3 M&A transaction costs 0.8 0.6 1.6 1.6 1.2 1.0 0.7 0.3 Adjusted EBITDA (12.5) (12.8) (13.1) (15.1) (14.7) (15.1) (14.8) (15.1)

Adjusted EBITDA: We define Adjusted EBITDA as Operating Income adjusted for depreciation and amortisation, share-based payments, income or expense related to the evaluation and execution of potential mergers or acquisitions and adjustments related to terminated and unused data centre sites. In certain circumstances, we may also adjust for other items that management believes are not representative of our current on-going performance. Examples include: adjustments for the cumulative effect of a change in accounting principle or estimate, impairment losses, litigation gains and losses or windfall gains and losses Adjusted diluted earnings per share: Adjusted diluted earnings per share amounts are determined on Adjusted net income Adjusted net income: We define Adjusted net income as net income adjusted to exclude income or expense related to the evaluation and execution of potential mergers or acquisitions, adjustments to provisions which are not reflective of our ongoing performance, and adjustments related to capitalised interest. In certain circumstances, we may also adjust for other items that management believes are not representative of our current on-going performance. Examples include: adjustments for the cumulative effect of a change in accounting principle or estimate, impairment losses, litigation gains and losses or windfall gains and losses ARPU: Monthly recurring revenue per square meter calculated as {reported recurring revenue in the quarter divided by 3} divided by {sum of prior and current quarter end reported revenue generating space divided by 2} Big 4: France, Germany, the Netherlands and the UK CAGR: Compound Annual Growth Rate Capital expenditures including intangible assets: Represent payments to acquire property, plant & equipment and intangible assets as recorded on our consolidated statement of cash flows as "Purchase of property, plant and equipment" and "Purchase of intangible assets”, respectively. Investments in intangible assets include power grid rights and software development Cash generated from operations: net cash flows from operating activities, excluding interest and fees paid, interest received and income tax paid Cash ROGIC: Cash Return on Gross Invested Capital (Cash ROGIC) defined as (Adjusted EBITDA less maintenance and other capex) divided by {Average of opening and closing (gross PP&E plus gross intangible assets plus gross goodwill)} Constant Currency: Measurements of the given metric that eliminate the effects of foreign currency rate fluctuations. To calculate 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 comparative period rather than the actual exchange rates in effect during the respective periods Definitions Corporate and Other: Unallocated items mainly comprising general and administrative expenses, assets and liabilities associated with our headquarters operations, provisions for onerous contracts (relating to the discounted amount of future losses expected to be incurred in respect of unused data centre sites over the term of the relevant leases) and revenue and expenses related to those onerous contracts, loans and borrowings and related expenses and income tax assets and liabilities Churn: Contracted Monthly Recurring Revenue which came to an end during the month as a percentage of the total contracted Monthly Recurring Revenue at the beginning of the month. Churn is calculated as a monthly average over the last 12 months Customer Available Power: The current installed electrical customer capacity Equipped Space: The amount of data centre space that, on the relevant date, is equipped and either sold or could be sold, without making any significant additional investments to common infrastructure LTM or Last Twelve Months: Twelve month period ended 31 December 2018, unless otherwise noted MW: Megawatts Recurring Revenue: 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 Rest of Europe / ROE: Austria, Belgium, Denmark, Ireland, Spain, Sweden, and Switzerland Revenue Generating Space: the amount of Equipped Space that is under contract and billed on the relevant date SQM: Square metres Utilisation Rate: on the relevant date, Revenue Generating Space as a percentage of Equipped Space. Some Equipped Space is not fully utilised due to customers' specific requirements regarding the layout of their equipment. In practice, therefore, Utilisation Rate does not reach 100%

Interxion Leadership David Ruberg, Chief Executive Officer John Doherty, Chief Financial Officer Giuliano Di Vitantonio, Chief Marketing & Strategy Officer Jan-Pieter Anten, SVP, Human Resources Jaap Camman, SVP, Legal Adriaan Oosthoek, SVP, IT & Operations Support Sell-Side Analyst Coverage Bank of America Merrill Lynch, Michael Funk Berenberg, Nate Crossett Citi, Mike Rollins Cowen, Colby Synesael Credit Suisse, Sami Badri Guggenheim, Rob Gutman Oppenheimer, Tim Horan Raymond James, Frank Louthan RBC Capital Markets, Jon Atkin Stifel, Erik Rasmussen Sun Trust Robinson Humphrey, Greg Miller Wells Fargo, Jennifer Fritzsche William Blair, Jim Breen Investor Relations Jim Huseby, VP, Investor Relations T: +1 813 644 9399 E: ir@interxion.com