Company lists · Data refreshed September 2026

Top 25 Enterprise system integrators based in the United Kingdom

Name: Enterprise system 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 28, 2026 494 companies tracked

RevenueBase identified 494 enterprise system integrators headquartered in the United Kingdom as of September 2026 and tracks 6,968 professional contacts across them, including 2,476 with verified work emails. London is the largest hub.

This list covers enterprise system 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 28, 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 28, 2026 86% judged on-target in blind review

494Companies

6,968Contacts tracked

2,476Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest enterprise system integrators based in the United Kingdom

Ranked by team size

Top 25 of 494 enterprise system integrators based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to enterprise system 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	Zenzero	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	501-1,000	401 contacts →
	Indirect evidence “We believe successful businesses are underpinned by quality IT infrastructure.” Source: RevenueBase Database · checked Sep 28, 2026
2	Kagool	Partial evidence	Birmingham, United KingdomHQ checked Sep 28, 2026	501-1,000	307 contacts →
	Partial evidence “Kagool is a global technology consultancy with over 20 years of experience helping enterprise organisations modernise SAP, data and AI platforms.” Source: RevenueBase Database · checked Sep 28, 2026
3	ITI Group	Indirect evidence	Sheffield, United KingdomHQ checked Sep 28, 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 28, 2026
4	BMSI	Strong evidence	Maidenhead, United KingdomHQ checked Sep 28, 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 28, 2026
5	Eappsys	Strong evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
6	Platned	Partial evidence	Gerrards Cross, United KingdomHQ checked Sep 28, 2026	201-500	190 contacts →
	Partial evidence “Platned helps organisations simplify complex change and get more value from their enterprise technology investments.” Source: RevenueBase Database · checked Sep 28, 2026
7	DOWDS	Partial evidence	Ballymena, United KingdomHQ checked Sep 28, 2026	201-500	164 contacts →
	Partial 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 28, 2026
8	CINOS	Strong evidence	Frimley, United KingdomHQ checked Sep 28, 2026	51-200	119 contacts →
	Strong evidence “Cinos is an industry-leading, agile, and innovative systems integrator.” Source: RevenueBase Database · checked Sep 28, 2026
9	Glue Reply	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	118 contacts →
	Indirect evidence “WHO WE ARE Glue Reply is a business consultancy that strives to help its clients achieve their future potential by developing solutions that often for the first time align IT…” Source: RevenueBase Database · checked Sep 28, 2026
10	European Electronique	Strong evidence	Eynsham, United KingdomHQ checked Sep 28, 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 28, 2026
11	Adsyst Automation Limited	Strong evidence	Yateley, United KingdomHQ checked Sep 28, 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 28, 2026
12	Twistedpair LTD	Indirect evidence	Portsmouth, United KingdomHQ checked Sep 28, 2026	51-200	83 contacts →
	Indirect evidence “Connecting people, places, and possibilities through transformative workplace technology.” Source: RevenueBase Database · checked Sep 28, 2026
13	Synoptix	Indirect evidence	Bristol, United KingdomHQ checked Sep 28, 2026	51-200	75 contacts →
	Indirect evidence “Synoptix was formed in 2011 to provide engineering solutions across various technical industries.” Source: RevenueBase Database · checked Sep 28, 2026
14	BIT Wave Solutions Limited	Indirect evidence	Reading, United KingdomHQ checked Sep 28, 2026	11-50	75 contacts →
	Indirect evidence “Headquartered at Reading, Berkshire in United Kingdom, Bit Wave Solutions enables global businesses to build their future by directing clients’ innovation & customization agenda.” Source: RevenueBase Database · checked Sep 28, 2026
15	Infoteck Solutions	Indirect evidence	Holborn, United KingdomHQ checked Sep 28, 2026	51-200	72 contacts →
	Indirect evidence “Infoteck Solutions: Empowering Integration and Automation Welcome to Infoteck Solutions, your trusted partner in seamless integration and efficient automation.” Source: RevenueBase Database · checked Sep 28, 2026
16	Bluesmith Information Systems	Partial evidence	Leeds, United KingdomHQ checked Sep 28, 2026	51-200	71 contacts →
	Partial evidence “Bluesmith specialises in bespoke systems for Blue Chip and government clients.” Source: RevenueBase Database · checked Sep 28, 2026
17	Eureka Solutions Scotland LTD	Partial evidence	East Kilbride, United KingdomHQ checked Sep 28, 2026	51-200	64 contacts →
	Partial evidence “At Eureka Solutions, we specialise in implementing powerful cloud-based systems that have the potential to revolutionise your business.” Source: RevenueBase Database · checked Sep 28, 2026
18	Forfusion LTD	Indirect evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 28, 2026	51-200	63 contacts →
	Indirect evidence “Empowering through digital transformation.” Source: RevenueBase Database · checked Sep 28, 2026
19	Advisority	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	61 contacts →
	Partial evidence “We are the trusted IT integrator that specialises in making your work flow.” Source: RevenueBase Database · checked Sep 28, 2026
20	Diegesis Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	52 contacts →
	Partial evidence “Diegesis is a business technology and IT systems integration company that specialises in Decision Support Solutions.” Source: RevenueBase Database · checked Sep 28, 2026
21	Synergy Compliance Solutions SCS	Strong evidence	Staines, United KingdomHQ checked Sep 28, 2026	11-50	50 contacts →
	Strong evidence “Synergy (SCS) helps institutions and system integrators simplify their technology resourcing challenges through the use of appropriate consulting services Synergy Compliance…” Source: RevenueBase Database · checked Sep 28, 2026
22	S P A Enterprise Services LTD	Strong evidence	Uxbridge, United KingdomHQ checked Sep 28, 2026	51-200	49 contacts →
	Strong evidence “S P A has been coined as our company name and the acronym which articulates three vital areas of an enterprise - Systems, Processes and Applications – which requires being robust…” Source: RevenueBase Database · checked Sep 28, 2026
23	Uxli Limited	Indirect evidence	Suite 14-7, United KingdomHQ checked Sep 28, 2026	51-200	49 contacts →
	Indirect evidence “UXLI is a UK-based data and AI consultancy with over a decade of experience helping organisations unlock value from their data.” Source: RevenueBase Database · checked Sep 28, 2026
24	Pace Integration	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	47 contacts →
	Strong evidence “Pace Integration is a unique technology consultancy that solves your integration challenge – focused on enterprise systems integration strategy, architecture and design that is…” Source: RevenueBase Database · checked Sep 28, 2026
25	Simkiss Control Systems LTD	Partial evidence	Middleton, United KingdomHQ checked Sep 28, 2026	51-200	47 contacts →
	Partial evidence “Simkiss Control Systems, part of United Infrastructure Group, is a trusted name in the field of industrial automation and control systems.” Source: RevenueBase Database · checked Sep 28, 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: enterprise system 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 enterprise system integrators.
Partial evidence: Its own public description names part of enterprise system integrators, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name enterprise system 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 494 enterprise system integrators based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 2,476 reachable decision-makers.

Free signup · no credit card

View the full list →

Enterprise system integrators based in the United Kingdom at a glance

As of Sep 28, 2026

35.5%Verified-email coverage

14.1Average contacts per company

1-10Median size (employees)

33.8%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

266

11-50

156

51-200

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 494 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 enterprise system 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 “enterprise system 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 enterprise system 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 enterprise system 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, 2,476 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 28, 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.

Enterprise system integrators by metro

Enterprise system integrators in London167

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 enterprise system 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 enterprise system integrators are there based in the United Kingdom?

RevenueBase identified 494 enterprise system 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?

Zenzero, headquartered in London, tops this list with the largest team on record.

Which city has the most enterprise system integrators?

London leads with 167 headquartered companies, followed by Bristol (11) and Sheffield (9).

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 2,476 verified decision-maker contacts tracked across these 494 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 28, 2026.

Ready to reach these companies? Verified emails and direct dials for all 494 enterprise system integrators based in the United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Enterprise system integrators by geography

Browse the directory

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.