Company lists · Data refreshed September 2026

Top 25 Enterprise systems integrators based in the United Kingdom

Name: Enterprise 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 28, 2026 317 companies tracked

RevenueBase identified 317 enterprise systems integrators headquartered in the United Kingdom as of September 2026 and tracks 4,890 professional contacts across them, including 2,065 with verified work emails. London is the largest hub.

This list covers enterprise 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 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

317Companies

4,890Contacts tracked

2,065Verified emails

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The 25 largest enterprise systems integrators based in the United Kingdom

Ranked by team size

Top 25 of 317 enterprise systems 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 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	OLR	Strong evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
2	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
3	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
4	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
5	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
6	Praesto Consulting	Indirect evidence	Staines-upon-thames, United KingdomHQ checked Sep 28, 2026	201-500	125 contacts →
	Indirect evidence “Technology consultancy providing expertise to complex IT programs.” Source: RevenueBase Database · checked Sep 28, 2026
7	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
8	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
9	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
10	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
11	Arlanis Reply UK	Indirect evidence	Westminster, United KingdomHQ checked Sep 28, 2026	11-50	72 contacts →
	Indirect evidence “Arlanis Reply is the Reply Group company specializing in Salesforce implementations.” Source: RevenueBase Database · checked Sep 28, 2026
12	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
13	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
14	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
15	ID Systems UK	Indirect evidence	Cumbernauld, United KingdomHQ checked Sep 28, 2026	51-200	57 contacts →
	Indirect evidence “Since 2002, we have been providing turnkey solutions which bring together our core skills of mechanical, electrical, instrumentation, control and automation, and telemetry…” Source: RevenueBase Database · checked Sep 28, 2026
16	Balloon ONE	Indirect evidence	Brentford, United KingdomHQ checked Sep 28, 2026	51-200	55 contacts →
	Indirect evidence “Working with distribution, manufacturing, and e-commerce organisations, Balloon One implements software solutions that fit their businesses perfectly and which help streamline…” Source: RevenueBase Database · checked Sep 28, 2026
17	Sci-Net Business Solutions	Indirect evidence	Chipping Norton, United KingdomHQ checked Sep 28, 2026	11-50	53 contacts →
	Indirect evidence “At Sci-Net Business Solutions (now part of the ANS Group) we are passionate and driven by the success of our customers.” Source: RevenueBase Database · checked Sep 28, 2026
18	Warrgyizmorsch	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	51 contacts →
	Indirect evidence “Tailored ERP, CRM & SaaS that automates your operations and fuels measurable growth.” Source: RevenueBase Database · checked Sep 28, 2026
19	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
20	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
21	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
22	Ajar Technology	Strong evidence	Brentford, United KingdomHQ checked Sep 28, 2026	11-50	46 contacts →
	Strong evidence “Ajar Technology is a successful and highly regarded end-to-end systems integrator with bases in Brentford and Bolton.” Source: RevenueBase Database · checked Sep 28, 2026
23	Winman ERP Software	Indirect evidence	Birmingham, United KingdomHQ checked Sep 28, 2026	11-50	43 contacts →
	Indirect evidence “WinMan is a powerful ERP Software solutions aimed specifically at the manufacturing, distribution, e-commerce and retail sectors.” Source: RevenueBase Database · checked Sep 28, 2026
24	Intelisense IT	Indirect evidence	Wolverhampton, United KingdomHQ checked Sep 28, 2026	201-500	39 contacts →
	Indirect evidence “Intelisense IT specialise in the delivery of world class business solutions.” Source: RevenueBase Database · checked Sep 28, 2026
25	Astro Communications LTD	Indirect evidence	Dartford, United KingdomHQ checked Sep 28, 2026	11-50	39 contacts →
	Indirect evidence “Astro Communications are experts in solving business challenges through the design, deployment and management of end-to-end communications and networking solutions.” 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 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 enterprise systems integrators.
Partial evidence: Its own public description names part of enterprise systems integrators, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name enterprise 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 317 enterprise systems integrators based in the United Kingdom

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Enterprise systems integrators based in the United Kingdom at a glance

As of Sep 28, 2026

42.2%Verified-email coverage

15.4Average contacts per company

11-50Median size (employees)

30.6%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

152

11-50

112

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 317 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 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 “enterprise 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 enterprise 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 enterprise 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, 2,065 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 systems integrators by metro

Enterprise systems integrators in London97

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 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 enterprise systems integrators are there based in the United Kingdom?

RevenueBase identified 317 enterprise 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?

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

Which city has the most enterprise systems integrators?

London leads with 97 headquartered companies, followed by Birmingham (7) and Manchester (7).

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 2,065 verified decision-maker contacts tracked across these 317 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.

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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.