Company lists · Data verified August 2026

Top 25 Enterprise IT infrastructure companies based in the United Kingdom

Name: Enterprise IT infrastructure companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 2,040 companies tracked

There are 2,040 enterprise IT infrastructure companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 38,240 professional contacts across them, including 13,109 with verified work emails and 2,334 with mobile numbers. London is the largest hub.

This list covers enterprise IT infrastructure companies headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

2,040Companies

38,240Contacts tracked

13,109Verified emails

2,334Mobile numbers

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The 25 largest enterprise IT infrastructure companies based in the United Kingdom

Ranked by team size

Top 25 of 2,040 enterprise IT infrastructure companies based in the United Kingdom, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Softcat	Whiteley	1,001-5,000	2,873	928
2	Kelly Group	Wembley	1,001-5,000	1,059	234
3	Sada, An Insight Company	Poole	10001+	872	139
4	Nasstar	Wakefield	1,001-5,000	841	381
5	Claranet	Warrington	1,001-5,000	816	1
6	Bytes Software Services	Portsmouth	501-1,000	784	523
7	Exponential-E	London	501-1,000	661	505
8	Ahana Systems And Solutions Pvt. LTD	London	501-1,000	645	183
9	Node4	London	1,001-5,000	624	480
10	XMA	Nottingham	501-1,000	585	308
11	ONNEC	London	501-1,000	580	375
12	Internet Initiative Japan IIJ	London	1,001-5,000	540	179
13	Maintech, Incorporated	London	501-1,000	529	245
14	Redstone Converged Solutions	London	201-500	452	19
15	Trustmarque	York	501-1,000	422	236
16	Iomart	Glasgow	201-500	422	200
17	Colt Data Centre Services	London	201-500	421	235
18	Zenzero	Coventry	501-1,000	403	281
19	Hashroot	Farnborough	201-500	333	2
20	prosource.it	London	501-1,000	326	107
21	BOXXE	London	201-500	289	186
22	ARO Technology	Aberdeen	201-500	258	197
23	ROC Technologies	n/a	201-500	245	120
24	Sudlows	London	201-500	230	103
25	Wanstor	London	201-500	226	147

Showing 25 of 2,040 enterprise IT infrastructure companies based in the United Kingdom

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Enterprise IT infrastructure companies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 593 HQs

2,334Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

1,014

11-50

662

51-200

207

201-500

501-1,000

1,001-5,000

10001+

Enterprise IT infrastructure companies by metro

Metro	Companies
Enterprise IT infrastructure companies in London	593
Enterprise IT infrastructure companies in Manchester	38
Enterprise IT infrastructure companies in Birmingham	36
Enterprise IT infrastructure companies in Glasgow	19
Enterprise IT infrastructure companies in Leeds	19
Enterprise IT infrastructure companies in Bristol	17
Enterprise IT infrastructure companies in Edinburgh	17

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “enterprise IT infrastructure companies”, with match quality audited by blind human judging, and headquartered in the United Kingdom.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Contact records re-verify on a rolling cadence; 0 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many enterprise IT infrastructure companies are there based in the United Kingdom?

There are 2,040 enterprise IT infrastructure companies headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Softcat, headquartered in Whiteley, tops this list with the largest team on record.

Which city has the most enterprise IT infrastructure companies?

London leads with 593 headquartered companies, followed by Manchester (38) and Birmingham (36).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 13,109 verified decision-maker contacts tracked across these 2,040 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph, the same data that powers RevenueBase's B2B data products and the free research portal.