Company lists · Data refreshed September 2026

Top 25 System integrator companies based in the United Kingdom

Name: System integrator companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 1,030 companies tracked

RevenueBase identified 1,030 system integrator companies headquartered in the United Kingdom as of September 2026 and tracks 13,831 professional contacts across them, including 6,084 with verified work emails. London is the largest hub.

This list covers system integrator 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. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 21, 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 21, 2026 86% judged on-target in blind review

1,030Companies

13,831Contacts tracked

6,084Verified emails

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The 25 largest system integrator companies based in the United Kingdom

Ranked by team size

Top 25 of 1,030 system integrator companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to system integrator companies: 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	Nasstar	Indirect evidence	Wakefield, United KingdomHQ checked Sep 21, 2026	1,001-5,000	844 contacts →
	Indirect evidence “Complexity isn’t the enemy.” Source: RevenueBase Database · checked Sep 21, 2026
2	XMA	Indirect evidence	Reading, United KingdomHQ checked Sep 21, 2026	501-1,000	538 contacts →
	Indirect evidence “Unlock your potential with XMA.” Source: RevenueBase Database · checked Sep 21, 2026
3	Zenitech	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	501-1,000	408 contacts →
	Indirect evidence “Zenitech creates technology to transform businesses.” Source: RevenueBase Database · checked Sep 21, 2026
4	Zenzero	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	501-1,000	401 contacts →
	Indirect evidence “We believe successful businesses are underpinned by quality IT infrastructure.” Source: RevenueBase Database · checked Sep 21, 2026
5	Trinity Fire & Security Systems	Indirect evidence	Exeter, United KingdomHQ checked Sep 21, 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 21, 2026
6	Arrow ECS United Kingdom	Indirect evidence	Harrogate, United KingdomHQ checked Sep 21, 2026	501-1,000	373 contacts →
	Indirect evidence “Arrow ECS is a technology enablement company that brings innovative IT solutions to market to solve complex business challenges.” Source: RevenueBase Database · checked Sep 21, 2026
7	Capula	Strong evidence	Stone, United KingdomHQ checked Sep 21, 2026	201-500	351 contacts →
	Strong 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 21, 2026
8	Kings Secure Technologies	Strong evidence	Bradford, United KingdomHQ checked Sep 21, 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 21, 2026
9	Total IT Global	Indirect evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
10	ITI Group	Indirect evidence	Sheffield, United KingdomHQ checked Sep 21, 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 21, 2026
11	Eappsys	Strong evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
12	Platned	Indirect evidence	Gerrards Cross, United KingdomHQ checked Sep 21, 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 21, 2026
13	Maintel Azzurri Communications	Strong evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
14	Vohkus	Indirect evidence	Fareham, United KingdomHQ checked Sep 21, 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 21, 2026
15	Barron Mccann Limited	Indirect evidence	Derby, United KingdomHQ checked Sep 21, 2026	201-500	170 contacts →
	Indirect evidence “Barron McCann install, deploy and maintain IT technology for some of the world’s largest brands in the retail, hospitality, leisure and corporate sectors.” Source: RevenueBase Database · checked Sep 21, 2026
16	DOWDS	Strong evidence	Ballymena, United KingdomHQ checked Sep 21, 2026	201-500	164 contacts →
	Strong evidence “With 45+ years in business, Dowds expertise spans the full lifecycle of complex build environments – from initial design and systems integration to final handover and beyond.” Source: RevenueBase Database · checked Sep 21, 2026
17	Modern Networks LTD	Indirect evidence	Hitchin, United KingdomHQ checked Sep 21, 2026	51-200	131 contacts →
	Indirect evidence “Modern Networks helps commercial property owners and managing agents turn buildings into high-performing, tenant-ready assets.” Source: RevenueBase Database · checked Sep 21, 2026
18	Sisl Global	Strong evidence	Uxbridge, United KingdomHQ checked Sep 21, 2026	1,001-5,000	128 contacts →
	Strong evidence “SISL Infotech is a market-leading IT infrastructure reseller and systems integrator with operations in EMEA / NAM / LATAM / APAC - data centre & cloud solutions - network…” Source: RevenueBase Database · checked Sep 21, 2026
19	CINOS	Strong evidence	Frimley, United KingdomHQ checked Sep 21, 2026	51-200	119 contacts →
	Strong evidence “Cinos is an industry-leading, agile, and innovative systems integrator.” Source: RevenueBase Database · checked Sep 21, 2026
20	European Electronique	Strong evidence	Eynsham, United KingdomHQ checked Sep 21, 2026	51-200	117 contacts →
	Strong evidence “European Electronique is a leading UK systems Integrator, specialising in the delivery of secure technology platforms including Hybrid IT, Cyber Security and Networking…” Source: RevenueBase Database · checked Sep 21, 2026
21	Total Integrated Solutions TIS LTD	Indirect evidence	Mansfield, United KingdomHQ checked Sep 21, 2026	51-200	94 contacts →
	Indirect evidence “Better protect your people, places and spaces.” Source: RevenueBase Database · checked Sep 21, 2026
22	Adsyst Automation Limited	Strong evidence	Yateley, United KingdomHQ checked Sep 21, 2026	51-200	93 contacts →
	Strong evidence “As a System Integrator for over 35 years, Adsyst (Automation) Ltd has been providing complex Control Systems for Process Control, Automation and Telemetry to customers worldwide.” Source: RevenueBase Database · checked Sep 21, 2026
23	Twistedpair LTD	Indirect evidence	Portsmouth, United KingdomHQ checked Sep 21, 2026	51-200	83 contacts →
	Indirect evidence “Connecting people, places, and possibilities through transformative workplace technology.” Source: RevenueBase Database · checked Sep 21, 2026
24	KCP Network	Indirect evidence	Bracknell, United KingdomHQ checked Sep 21, 2026	51-200	81 contacts →
	Indirect evidence “KCP \| Network Solutions and Design \| Software Development \| Automation Since 2008 KCP built a legacy of trust with our global customers by becoming a leading provider of SMART…” Source: RevenueBase Database · checked Sep 21, 2026
25	CST	Indirect evidence	Wooburn Green, United KingdomHQ checked Sep 21, 2026	51-200	76 contacts →
	Indirect evidence “CST is an I.T.” Source: RevenueBase Database · checked Sep 21, 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: system integrator companies. 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 system integrator companies.
Partial evidence: Its own public description names part of system integrator companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name system integrator companies. 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 1,030 system integrator companies based in the United Kingdom

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System integrator companies based in the United Kingdom at a glance

As of Sep 21, 2026

44.0%Verified-email coverage

13.4Average contacts per company

1-10Median size (employees)

22.5%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

543

11-50

347

51-200

107

201-500

501-1,000

1,001-5,000

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 1,030 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 system integrator companies, 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 “system integrator companies”. 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 system integrator companies), 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 system integrator companies, 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, 6,084 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 21, 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.

System integrator companies by metro

System integrator companies in London232

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 system integrator companies, 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 system integrator companies are there based in the United Kingdom?

RevenueBase identified 1,030 system integrator companies 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?

Nasstar, headquartered in Wakefield, tops this list with the largest team on record.

Which city has the most system integrator companies?

London leads with 232 headquartered companies, followed by Manchester (22) and Bristol (20).

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 6,084 verified decision-maker contacts tracked across these 1,030 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 21, 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.