European Colocation and Data Center Providers

#1 NorthC

Oude Meer, Netherlands Founded 2020 Fixed monthly amount per its colocation page, no price list published; quote form on the site Demo on request

Best for: Mid-sized organisations that want a regional site close to home with a named site manager

• Operating company. NorthC Datacenters B.V.
• Jurisdiction. EU (Netherlands)
• Where the data sits. Netherlands, Germany and Switzerland
• Source code. Closed source
• Replaces. Equinix

NorthC sells colocation from halls spread over the Netherlands, Germany and Switzerland, from Aalsmeer and Almere to Munich, Winterthur and Geneva. The customer portal shows energy use, inlet temperature and relative humidity per rack, and Region Connect links all halls, so a cloud or service provider reachable in one is reachable in another. Customers pay a fixed amount per month.

NorthC Datacenters B.V. of Oude Meer, Chamber of Commerce number 67708927, was formed in 2020 when The Datacenter Group and NLDC merged, then bought IP Exchange GmbH in 2021 and the Netrics sites in 2022. Its certification page ties each ISO standard to named sites, and the group says its halls run on green energy. Its owners are not named on the pages read.

Standout feature. NorthC is the only provider here that puts a rack-level temperature and power readout in the customer portal across three countries.

#2 Green Mountain

Norway (Stavanger and Oslo regions), Norway Power invoiced by usage; price list not published Demo on request

Best for: Heat-heavy or power-hungry deployments that want Nordic cooling conditions

• Operating company. Green Mountain AS
• Jurisdiction. EEA, not EU (Norway)
• Where the data sits. Norway, United Kingdom, Germany (in construction)
• Source code. Closed source
• Replaces. Equinix

Green Mountain AS runs hydropower-fed data centers around Stavanger, Telemark and Oslo, plus LON-East in London, with FRA-Mainz in the Frankfurt region under construction with the German power company KMW. It splits its offer into rack by rack from one 42U rack, private cages of roughly 4 to 20 racks, and data rooms from 50 square metres.

The brand is a registered trademark owned by Green Mountain AS, and the pages read give no founding year or owner. It holds ISO 9001 and ISO 14001 and publishes a CO2 calculator. According to the vendor, it signed a contract with a neocloud operator at LON-East in September 2026. Power is billed by usage, and latency to Frankfurt should be tested.

Standout feature. Green Mountain is the only provider here that lets a prospect estimate the CO2 difference of a workload with a public calculator.

#3 Datacenter United

Antwerp, Belgium Quote on request Demo on request

Best for: Belgian organisations and IT service providers that want an in-country site with audit reports

• Operating company. ANTWERP DATACENTER (trading as Datacenter United)
• Jurisdiction. EU (Belgium)
• Where the data sits. Belgium
• Source code. Closed source
• Replaces. Equinix

Datacenter United quotes 14 data centers across 12 Belgian locations, among them Antwerp, Brussels, Ghent, Hasselt and Oostkamp near Bruges. Services cover colocation, private cages, carrier-neutral connectivity, remote hands and migration support, with technicians on call around the clock. The website defaults to Dutch, with an English switch.

The privacy statement names ANTWERP DATACENTER at Haifastraat 6 in Antwerp, enterprise number BE 0715.408.157, so confirm which entity signs your order. Its certificates include ISO 27001, PCI DSS, an ISAE 3402 Type II statement and a Tier IV Design and Facility certificate from the Uptime Institute. A news item announces EUR 120 million of financing with a further EUR 50 million through an accordion facility.

Standout feature. Datacenter United is the only provider here that combines a nationwide network with both an ISAE 3402 Type II statement and a Tier IV Design and Facility certificate.

#4 Pulsant

Maidenhead, United Kingdom Founded 1995 Quote on request Demo on request

Best for: UK companies that want racks near their regional offices and customers

• Operating company. Pulsant Limited
• Jurisdiction. United Kingdom (adequacy decision, outside the EEA)
• Where the data sits. United Kingdom
• Source code. Closed source
• Replaces. Equinix

Pulsant operates 14 data centres in the UK: three in Edinburgh, two in Newcastle, two in Reading, and one each in Manchester, Rotherham, Birmingham, Milton Keynes, Maidenhead, Croydon and Fareham. Edge Fabric, its private network, joins them with a choice of carriers, public clouds and peering exchanges, and its IaaS platform is stated to be fully owned and hosted in the UK.

Pulsant Limited, registered number 03625971, has its headquarters in Maidenhead and says it has served UK businesses since 1995. The colocation page shows 1.2 MW available and local teams on site, and the company states 100 percent renewable power. More than 500 MSPs, ISPs and partners are named in the ecosystem. Owners are not stated on the pages read, and Pulsant sells by quote.

Standout feature. Pulsant is the only provider here that pairs a national estate of regional sites with a UK-hosted IaaS platform on its own network.

#5 Green.ch

Lupfig, Switzerland Quote on request Demo on request

Best for: Swiss companies and integrators that want geo-redundant housing inside Switzerland

• Operating company. Green Datacenter AG / green.ch AG
• Jurisdiction. Switzerland (adequacy decision, outside the EEA)
• Where the data sits. Switzerland
• Source code. Closed source
• Replaces. Equinix

Green.ch rents racks, cages and suites at four Zurich-area locations: Campus ZRH1 in Lupfig, Campus ZRH2 in Dielsdorf, ZRH3 in Schlieren and ZRH4 in Glattbrugg. ZRH3 is underground and designed for finance, and ZRH4 connects to the Green fibre ring. Cross connects, SwissIX, SD-WAN and cloud connect products sit beside private, public and hybrid cloud and the Swiss Cube IaaS line.

The imprint names Green Datacenter AG / green.ch AG at Industriestrasse 33 in Lupfig. The same company sells internet, TV and hosting to residential and SME customers. Its own page says it has belonged to the IFM Global Infrastructure Fund since 30 October 2025. The site gives six and seven as the number of data centers in different places, and no price list is published.

Standout feature. Green.ch is the only provider here that sells Swiss colocation together with a consumer and SME telecom business under one company.

#6 Kao Data

Harlow, United Kingdom Quote on request Demo on request

Best for: AI and HPC tenants near London that need dense halls with efficiency guarantees

• Operating company. Harlow Operations Limited (trading as Kao Data)
• Jurisdiction. United Kingdom (adequacy decision, outside the EEA)
• Where the data sits. United Kingdom
• Source code. Closed source
• Replaces. Equinix

Kao Data rents Technology Suites of 1,100 kW or 2,200 kW, private cages from about 34 racks and single racks of 1 to 20 kW. Its colocation page states an SLA-backed PUE of 1.2, and halls are listed as OCP-Ready and NVIDIA DGX-Ready. Single racks come through ServerChoice and sit at KLON-01 in Harlow unless requested otherwise, with a 24/7 team running ticketed remote hands.

Kao Data is the trading name of Harlow Operations Limited, registered number 09227383. It lists campuses in Harlow, Slough and Northolt (fully occupied) and a planned Greater Manchester site, and names over 160 MW operational, under development or planned. The investors page names Infratil Limited of New Zealand, Legal & General Capital and the Goldacre - Noe Group.

Standout feature. Kao Data is the only provider here that writes a PUE figure into its service level agreement.

#7 Nabiax

Madrid, Spain Founded 2019 Quote on request Demo on request

Best for: Spanish enterprises, carriers and cloud providers that need Madrid or Barcelona capacity

• Operating company. Digital Data Centre Bidco, S.L. and Digital DHF Iberia, S.L.U.
• Jurisdiction. EU (Spain)
• Where the data sits. Spain
• Source code. Closed source
• Replaces. Equinix

Nabiax offers carrier-neutral colocation in Spain, with data centers at Alcala de Henares, Julian Camarillo in Madrid and Terrassa near Barcelona. The services page describes most sites as Tier III, with duplicated feeds and several routes for power and cooling, and security with CCTV and biometric access at several levels per room.

According to the vendor, Nabiax was founded in 2019, is backed by Aermont Capital and has 35 MW installed, with room beyond 120 MW through the ADC3 extension at Alcala. The legal notice names Digital Data Centre Bidco, S.L. and Digital DHF Iberia, S.L.U. in Madrid. In July 2025 it announced a renewed Tier IV Gold Certification for Operational Sustainability, and Telefonica is its main reference customer.

Standout feature. Nabiax is the only provider here that holds a Tier IV Gold certificate for operational sustainability, at its Alcala site.

#8 maincubes

Frankfurt am Main, Germany Quote on request Demo on request

Best for: Cloud, AI and public sector tenants that need German capacity from a German operator

• Operating company. maincubes Holding & Service GmbH
• Jurisdiction. EU (Germany)
• Where the data sits. Germany and the Netherlands
• Source code. Closed source
• Replaces. Equinix

maincubes lists FRA01 to FRA03 and the planned FRA04 and FRA05 in Frankfurt, BER01 and BER02 in Berlin, and AMS01 in Amsterdam. Only FRA01 (6 MW, opened 2017) and AMS01 (5 MW, OCP Ready, opened 2018) are colocation sites. FRA02 and BER01 are government-leased halls with N+1 design, and FRA03 supplies 16 MW to hyperscale and HPC tenants.

maincubes Holding & Service GmbH, Tilsiter Strasse 1, is entered in the commercial register as HRB 118726 at Amtsgericht Frankfurt. The company states a portfolio above 400 MW and calls its ownership structure German, while its page shows investor team DTCP with offices including San Francisco. The website is German first, and BER02 is listed at 144 to 186 MW under construction.

Standout feature. maincubes is the only provider here that leases halls to government agencies and lists a Berlin build of up to 186 MW.

#9 Ark Data Centres

Corsham, United Kingdom Quote on request Demo on request

Best for: UK public bodies and cloud tenants wanting government-assured space

• Operating company. Ark Data Centres Limited
• Jurisdiction. United Kingdom (adequacy decision, outside the EEA)
• Where the data sits. United Kingdom, Belgium and Spain sites listed
• Source code. Closed source
• Replaces. Equinix

Ark Data Centres lists UK campuses named Spring Park, Cody Park, Meridian Park, Union Park, Longcross Park, Alliance Park and Hilfield Park, plus Brussels and Barcelona menu entries. It offers hosting for UK public sector bodies through Crown Hosting Data Centres, and its pages cover liquid, indirect air and direct air cooling and modular construction.

Ark Data Centres Limited is registered in England and Wales under number 05656968, with its registered office at Spring Park near Corsham. The standards list runs from Cyber Essentials Plus to ISO 9001, 14001, 22301, 27001, 45001, 50001 and PCI DSS. The About page shows 567 MW secured, 394 MW available and 27 data centres in 9 locations, all stamped 1 January 2025.

Standout feature. Ark Data Centres is the only provider here with a stated hosting route for the UK public sector through Crown Hosting.

#10 DATA4

Paris, France Founded 2006 Quote on request Demo on request

Best for: Organisations that need the same operator across several EU countries

• Operating company. DATA4 Services (Joint Stock Company Unipersonal)
• Jurisdiction. EU (France)
• Where the data sits. France, Italy, Spain, Poland, Germany, Greece
• Source code. Closed source
• Replaces. Equinix

DATA4 states that it finances, designs, builds and operates its own data centers, on campuses at Marcoussis near Paris, Cornaredo near Milan, Alcobendas in Madrid, Jawczyce near Warsaw, Hanau near Frankfurt and Paiania near Athens. A tenant can rent a single rack, a suite of 200 to 1,000 square metres at 350 to 1,800 kW, or a dedicated building.

DATA4 Services, a sole-shareholder company registered in Paris under RCS 493 254 643, says it was founded in 2006. Its certificate list includes ISO 27001, PCI DSS and the French HDS approval, and it notes that certifications differ by country and site. Per the vendor, a customised building takes nine months at 4 MW on average. Owners are not named on the pages read.

Standout feature. DATA4 is the only provider here that offers one operator in six EU countries, from a single rack to a dedicated building.