Company lists · Data refreshed September 2026

Top 25 Systems integrators based in the United Kingdom

Name: Systems integrators based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 15, 2026 1,762 companies tracked

RevenueBase identified 1,762 systems integrators headquartered in the United Kingdom as of September 2026 and tracks 32,655 professional contacts across them, including 13,174 with verified work emails. London is the largest hub.

This list covers systems integrators headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 15, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 15, 2026 86% judged on-target in blind review

1,762Companies

32,655Contacts tracked

13,174Verified emails

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The 25 largest systems integrators based in the United Kingdom

Ranked by team size

Top 25 of 1,762 systems integrators based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 15, 2026. RevenueBase Smart Search rates how each company's information relates to systems integrators: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	EOS IT Solutions	Indirect evidence	Banbridge, United KingdomHQ checked Sep 15, 2026	1,001-5,000	1,478 contacts →
	Indirect evidence “EOS IT Solutions is a global technology and logistics provider delivering collaboration, IT, and managed services to leading organizations worldwide.” Source: RevenueBase Database · checked Sep 15, 2026
2	Nasstar	Indirect evidence	Wakefield, United KingdomHQ checked Sep 15, 2026	1,001-5,000	844 contacts →
	Indirect evidence “Complexity isn’t the enemy.” Source: RevenueBase Database · checked Sep 15, 2026
3	Crown House Technologies	Indirect evidence	Dartford, United KingdomHQ checked Sep 15, 2026	1,001-5,000	617 contacts →
	Indirect evidence “Part of the Laing O’Rourke Group, and founded on more than 200 years of experience, we are a leading construction and infrastructure technology services provider, supplying a…” Source: RevenueBase Database · checked Sep 15, 2026
4	ONNEC	Indirect evidence	London, United KingdomHQ checked Sep 15, 2026	501-1,000	585 contacts →
	Indirect evidence “Onnec is a leading partner for IT Infrastructure design, installation and operational support services.” Source: RevenueBase Database · checked Sep 15, 2026
5	XMA	Indirect evidence	Reading, United KingdomHQ checked Sep 15, 2026	501-1,000	538 contacts →
	Indirect evidence “Unlock your potential with XMA.” Source: RevenueBase Database · checked Sep 15, 2026
6	Protec Fire And Security Group	Strong evidence	Nelson, United KingdomHQ checked Sep 15, 2026	501-1,000	493 contacts →
	Strong evidence “Through our team of over 900 creative individuals, we've positioned ourselves as a respected force as a life safety systems integrator.” Source: RevenueBase Database · checked Sep 15, 2026
7	Trustmarque	Indirect evidence	York, United KingdomHQ checked Sep 15, 2026	501-1,000	421 contacts →
	Indirect evidence “Trustmarque delivers the value of technology to bring real-life impact.” Source: RevenueBase Database · checked Sep 15, 2026
8	Zenitech	Indirect evidence	London, United KingdomHQ checked Sep 15, 2026	501-1,000	408 contacts →
	Indirect evidence “Zenitech creates technology to transform businesses.” Source: RevenueBase Database · checked Sep 15, 2026
9	Zenzero	Indirect evidence	London, United KingdomHQ checked Sep 15, 2026	501-1,000	401 contacts →
	Indirect evidence “We believe successful businesses are underpinned by quality IT infrastructure.” Source: RevenueBase Database · checked Sep 15, 2026
10	Connect	Strong evidence	London, United KingdomHQ checked Sep 15, 2026	201-500	398 contacts →
	Strong evidence “We’re Connect, a global systems integrator and digital transformation expert with over 35 years of experience.” Source: RevenueBase Database · checked Sep 15, 2026
11	Trinity Fire & Security Systems	Indirect evidence	Exeter, United KingdomHQ checked Sep 15, 2026	501-1,000	386 contacts →
	Indirect evidence “Trinity’s mission statement is simple - to provide high quality design, installation, commissioning and long term after care of Fire Detection, Fire Suppression, Life Safety and…” Source: RevenueBase Database · checked Sep 15, 2026
12	TD Synnex Uk&i	Indirect evidence	Chineham, United KingdomHQ checked Sep 15, 2026	10001+	372 contacts →
	Indirect evidence “We’re TD SYNNEX (NYSE: SNX), a leading distributor and solutions aggregator for the IT ecosystem.” Source: RevenueBase Database · checked Sep 15, 2026
13	Capula	Partial evidence	Stone, United KingdomHQ checked Sep 15, 2026	201-500	351 contacts →
	Partial evidence “What we do \| With a focus on operational technology and digital transformation, Capula has been a leader in advanced system integration for decades; optimising efficiency &…” Source: RevenueBase Database · checked Sep 15, 2026
14	Kings Secure Technologies	Strong evidence	Bradford, United KingdomHQ checked Sep 15, 2026	501-1,000	326 contacts →
	Strong evidence “Kings Secure Technologies (KST) is a high-end, enterprise-level systems integrator.” Source: RevenueBase Database · checked Sep 15, 2026
15	ARCH	Indirect evidence	London, United KingdomHQ checked Sep 15, 2026	n/a	307 contacts →
	Indirect evidence “Arch has specialised in SAP solutions for over 25 years and our team has extensive experience of SAP technologies and SAP usability.” Source: RevenueBase Database · checked Sep 15, 2026
16	OLR	Strong evidence	London, United KingdomHQ checked Sep 15, 2026	201-500	292 contacts →
	Strong evidence “OLR is a specialist Oracle Retail systems integrator delivering end-to-end omnichannel solutions to enable leading retailers to accelerate business success through system…” Source: RevenueBase Database · checked Sep 15, 2026
17	Total IT Global	Indirect evidence	London, United KingdomHQ checked Sep 15, 2026	201-500	286 contacts →
	Indirect evidence “At Total IT Global, we elevate your digital journey with cutting-edge innovation, to achieve your vision of ‘the enterprise of the future’.” Source: RevenueBase Database · checked Sep 15, 2026
18	ITI Group	Indirect evidence	Sheffield, United KingdomHQ checked Sep 15, 2026	201-500	234 contacts →
	Indirect evidence “For organisations facing the compounding threats of ageing assets, a retiring workforce, and evolving cyber attacks, the status quo is no longer an option.” Source: RevenueBase Database · checked Sep 15, 2026
19	BMSI	Strong evidence	Maidenhead, United KingdomHQ checked Sep 15, 2026	201-500	218 contacts →
	Strong evidence “BMSI is the UK’s largest & leading Independent systems integrator of Building Energy Management Systems (BEMS).” Source: RevenueBase Database · checked Sep 15, 2026
20	Scci Alphatrack	Partial evidence	Harlow, United KingdomHQ checked Sep 15, 2026	201-500	205 contacts →
	Partial evidence “Part of the SCCI Group, SCCI Alphatrack designs, installs, and maintains connected building systems across social housing, commercial property, new builds, and public sector…” Source: RevenueBase Database · checked Sep 15, 2026
21	Evolution Electronic Security Systems LTD	Strong evidence	Marlow, United KingdomHQ checked Sep 15, 2026	201-500	200 contacts →
	Strong evidence “Founded in 1996 we have grown into one of the UK and Ireland’s leading qualified and accredited security and fire systems integrators, working across Europe to bring together…” Source: RevenueBase Database · checked Sep 15, 2026
22	Eappsys	Strong evidence	London, United KingdomHQ checked Sep 15, 2026	51-200	193 contacts →
	Strong evidence “eAppSys is a systems integrator that is focused exclusively on supporting the core enterprise application systems within Oracle On-Premise and Cloud Applications.” Source: RevenueBase Database · checked Sep 15, 2026
23	Platned	Indirect evidence	Gerrards Cross, United KingdomHQ checked Sep 15, 2026	201-500	190 contacts →
	Indirect evidence “Platned helps organisations simplify complex change and get more value from their enterprise technology investments.” Source: RevenueBase Database · checked Sep 15, 2026
24	Maintel Azzurri Communications	Strong evidence	London, United KingdomHQ checked Sep 15, 2026	501-1,000	186 contacts →
	Strong evidence “Maintel is a leading systems integrator and managed services provider, delivering effortless communications solutions to a broad spectrum of businesses in the UK and…” Source: RevenueBase Database · checked Sep 15, 2026
25	Vohkus	Indirect evidence	Fareham, United KingdomHQ checked Sep 15, 2026	51-200	184 contacts →
	Indirect evidence “Vohkus is a rapidly growing, highly agile UK IT supplier specialising in end-to-end IT supply, enterprise infrastructure solutions, and comprehensive managed services.” Source: RevenueBase Database · checked Sep 15, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: systems integrators. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names systems integrators.
Partial evidence: Its own public description names part of systems integrators, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name systems integrators. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 1,762 systems integrators based in the United Kingdom

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Systems integrators based in the United Kingdom at a glance

As of Sep 15, 2026

40.3%Verified-email coverage

18.5Average contacts per company

1-10Median size (employees)

22.9%Largest-city concentration · London

Sep 15, 2026Page data refreshed

Companies by employee count

1-10

924

11-50

578

51-200

185

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 1,762 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among systems integrators, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “systems integrators”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names systems integrators), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among systems integrators, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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: Every listed company carries at least one verified work email, 13,174 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 15, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Systems integrators by metro

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names systems integrators, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many systems integrators are there based in the United Kingdom?

RevenueBase identified 1,762 systems integrators headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

EOS IT Solutions, headquartered in Banbridge, tops this list with the largest team on record.

Which city has the most systems integrators?

London leads with 404 headquartered companies, followed by Birmingham (29) and Manchester (28).

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 13,174 verified decision-maker contacts tracked across these 1,762 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 15, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 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 with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.