35 operators · 120 facilities · 1,536 MW tracked
Data center companies in United Kingdom
35 operators run 120 tracked data centers in United Kingdom: 108 operational, 12 under construction or announced, 1,536+ MW of published IT capacity. Built from operator and registry sources — a shortlist of the market, not an exhaustive census.
How many data center companies operate in United Kingdom?
Coloprice tracks 35 data center operators with 120 facilities in United Kingdom. The largest by facility count is Pulsant (14 facilities); by published IT capacity it is Ada Infrastructure with 210 MW disclosed. Counts reflect the Coloprice catalog as of 2026-09-26.
Largest by tracked facilities
- Pulsant 14 facilities
- Digital Realty (Interxion) 13 facilities
- Equinix 10 facilities
- Stellanor 8 facilities
- CyrusOne 6 facilities
Largest by published capacity
- Ada Infrastructure 210 MW published
- Colt DCS 204 MW published
- VIRTUS Data Centres 192 MW published
- CyrusOne 158 MW published
- Yondr Group 100 MW published
Operators in United Kingdom
Sorted by tracked facilities, then published capacity. MW is the sum of capacity each operator publishes for its United Kingdom sites — undisclosed values are not estimated.
| Operator | Facilities | Published MW | Cities | Status | Certifications | AI-ready |
|---|---|---|---|---|---|---|
| Pulsant | 14 | 22 | Edinburgh, Newcastle, Reading, Milton Keynes +6 | 14 live · 0 pipeline | not published | — |
| Digital Realty (Interxion) | 13 | not published | London, Woking, Crawley, Chessington +2 | 13 live · 0 pipeline | ISO 27001, SOC 2, ISO 14001 | — |
| Equinix | 10 | not published | London, Slough | 10 live · 0 pipeline | Climate Neutral Data Centre Pact, Cyber Essentials, EU Code of Conduct | 1 |
| Stellanor | 8 | 5 MW (1 of 8 sites) | London, West Byfleet, Woking, Crawley +1 | 8 live · 0 pipeline | not published | — |
| CyrusOne | 6 | 158 | London | 5 live · 1 pipeline | ISO 14001 | — |
| NTT Global Data Centers | 6 | 85 MW (5 of 6 sites) | London, Hemel Hempstead, Slough | 6 live · 0 pipeline | not published | — |
| Ark Data Centres | 6 | not published | Corsham, Farnborough, Chertsey, London | 4 live · 2 pipeline | Cyber Essentials Plus, ISO 14001, ISO 22301 | 3 |
| Colt DCS | 5 | 204 | London, Welwyn Garden City | 3 live · 2 pipeline | not published | 2 |
| Telehouse | 5 | 18 MW (1 of 5 sites) | London | 5 live · 0 pipeline | ISO 14001, ISO 27001, ISO 9001 | — |
| VIRTUS Data Centres | 4 | 192 | London, Slough | 4 live · 0 pipeline | BREEAM Good, Uptime Tier III | — |
| Yondr Group | 3 | 100 | Slough | 2 live · 1 pipeline | not published | — |
| Vantage Data Centers | 3 | 75 MW (2 of 3 sites) | Cardiff, London | 3 live · 0 pipeline | BREEAM Excellent, ISAE 3402, ISO 14001 | 1 |
| Kao Data | 3 | 71 | Harlow, Slough, Stockport | 2 live · 1 pipeline | BREEAM Excellent, NVIDIA DGX-Ready, OCP-Ready | 2 |
| Iron Mountain | 3 | 61 | London | 2 live · 1 pipeline | HITRUST, ISO 14001, ISO 22301 | — |
| iomart | 3 | 11 MW (1 of 3 sites) | London, Maidenhead | 3 live · 0 pipeline | Cyber Essentials Plus, ISO 22301, ISO 27001 | — |
| Global Switch | 3 | not published | London | 2 live · 1 pipeline | not published | — |
| Keppel DC REIT | 3 | not published | Bracknell, London, Cardiff | 3 live · 0 pipeline | not published | — |
| Node4 | 3 | not published | Derby, Leeds, Northampton | 3 live · 0 pipeline | ISO 27001 accredited, PCI compliant | — |
| Pure Data Centres Group | 2 | 90 | London | 1 live · 1 pipeline | Platinum Zero Waste to Landfill Certification | — |
| Custodian Data Centres | 2 | 10 MW (1 of 2 sites) | Dartford, Maidstone | 2 live · 0 pipeline | ISO 27001 | — |
| Ada Infrastructure | 1 | 210 | London | 0 live · 1 pipeline | not published | 1 |
| Nscale | 1 | 90 | Loughton, Essex | 1 live · 0 pipeline | not published | 1 |
| Pure Data Centres Group / SEGRO (JV) | 1 | 72 | London | 0 live · 1 pipeline | not published | 1 |
| DataVita | 1 | 24 | Glasgow (Chapelhall) | 1 live · 0 pipeline | Uptime Institute Tier III Certification of Constructed Facility, Uptime Institute Tier III Certification of Design Documents | — |
| Csquare | 1 | 15 | Reading | 1 live · 0 pipeline | ISO 27001, NIST 800-53 PE High, PCI-DSS | 1 |
| ServerFarm | 1 | 11 | London | 1 live · 0 pipeline | not published | 1 |
| Aptum Technologies | 1 | 10 | Havant | 1 live · 0 pipeline | ISO 27001, PCI-DSS v3.2.1, SOC 2 | — |
| DataBank | 1 | 4 | London | 1 live · 0 pipeline | not published | — |
| brightsolid | 1 | not published | Aberdeen | 1 live · 0 pipeline | ISO 22301, ISO 27001, ISO 9001 | — |
| China Mobile International | 1 | not published | Slough | 1 live · 0 pipeline | not published | — |
| European Data Centre | 1 | not published | Edinburgh | 1 live · 0 pipeline | ANSI/TIA-942-B Facility - Rated 2 | — |
| IONOS (Fasthosts) | 1 | not published | Worcester | 1 live · 0 pipeline | Uptime Institute Tier IV Certification of Constructed Facility | — |
| nLighten | 1 | not published | Birmingham | 1 live · 0 pipeline | ISO 27001, Uptime Institute Tier III Certification of Design Documents | — |
| OVHcloud | 1 | not published | London | 1 live · 0 pipeline | not published | — |
| Volta Data Centres | 1 | not published | London | 1 live · 0 pipeline | ISO 14001, ISO 9001, ISO/IEC 27001 | — |
AI-ready operators in United Kingdom
10 of 35 operators mark at least one United Kingdom facility as AI-ready (published liquid cooling or high-density design): Equinix, Ark Data Centres, Colt DCS, Vantage Data Centers, Kao Data, Ada Infrastructure, Nscale, Pure Data Centres Group / SEGRO (JV), Csquare, ServerFarm.
See also
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FAQ
Which is the largest data center company in United Kingdom?
By tracked facilities: Pulsant with 14 sites. By published capacity: Ada Infrastructure with 210 MW. Facility counts and MW come from operator pages and registries; published megawatts describe site design, not vacant capacity for a new order.
Do all of these companies sell colocation in United Kingdom?
No. The list includes colocation and wholesale operators as well as hyperscaler- or enterprise-owned sites that do not sell space. Open each facility card for status, certifications and the operator's own page before requesting a quote.
How is this list of United Kingdom data center companies built?
From the Coloprice catalog: every facility is recorded from a primary source (operator website, press release, certification registry), so a company appears here when at least one of its United Kingdom sites is tracked. No operator pays for placement, and the ranking is not for sale.
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