Company lists · Data refreshed September 2026

Top 25 Federal systems integrators based in the United Kingdom

Name: Federal 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 21, 2026 191 companies tracked

RevenueBase identified 191 federal systems integrators headquartered in the United Kingdom as of September 2026 and tracks 4,576 professional contacts across them, including 1,775 with verified work emails. London is the largest hub.

This list covers federal 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 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

191Companies

4,576Contacts tracked

1,775Verified emails

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The 25 largest federal systems integrators based in the United Kingdom

Ranked by team size

Top 25 of 191 federal systems integrators 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 federal 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	MTI	Indirect evidence	Staines-upon-thames, United KingdomHQ checked Sep 21, 2026	201-500	764 contacts →
	Indirect evidence “MTI provides award-winning, end-to-end technology solutions and services in cyber security and data centre for over 35 years.” 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	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
4	Flat Rock Technology	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	231 contacts →
	Indirect evidence “Since 2008, Flat Rock Technology, a software engineering, SI, Cloud DevOps, Cyber Security, and Customer Experience (CX) company, has been at the forefront of providing innovative…” Source: RevenueBase Database · checked Sep 21, 2026
5	DOWDS	Partial evidence	Ballymena, United KingdomHQ checked Sep 21, 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 21, 2026
6	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
7	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
8	Conosco	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	105 contacts →
	Indirect evidence “Cybersecurity specialists providing technology and telecoms solutions that gives you the leadership, experience and resilience you need to build and secure the future of work.” Source: RevenueBase Database · checked Sep 21, 2026
9	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
10	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
11	Principle ONE	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	78 contacts →
	Partial evidence “Principle One provides Systems Engineering, Architecture and Business Consulting services within the Law Enforcement, National Security, Health and wider public sector.” Source: RevenueBase Database · checked Sep 21, 2026
12	Synoptix	Indirect evidence	Bristol, United KingdomHQ checked Sep 21, 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 21, 2026
13	Bluesmith Information Systems	Partial evidence	Leeds, United KingdomHQ checked Sep 21, 2026	51-200	71 contacts →
	Partial evidence “Bluesmith specialises in bespoke systems for Blue Chip and government clients.” Source: RevenueBase Database · checked Sep 21, 2026
14	Forfusion LTD	Indirect evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 21, 2026	51-200	63 contacts →
	Indirect evidence “Empowering through digital transformation.” Source: RevenueBase Database · checked Sep 21, 2026
15	Alphatrack Systems	Partial evidence	Harlow, United KingdomHQ checked Sep 21, 2026	201-500	57 contacts →
	Partial evidence “At Alphatrack Systems Ltd, we don’t just install equipment-we engineer integrated solutions that deliver safety, compliance, and ultimate peace of mind.” Source: RevenueBase Database · checked Sep 21, 2026
16	Sword Ping Network Solutions	Strong evidence	Bellshill, United KingdomHQ checked Sep 21, 2026	51-200	55 contacts →
	Strong evidence “Based in Scotland, we are a leading systems integrator & managed service provider with offices in Bellshill and Aberdeen.” Source: RevenueBase Database · checked Sep 21, 2026
17	Diegesis Limited	Partial evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
18	Pace Integration	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	47 contacts →
	Partial 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 21, 2026
19	Simkiss Control Systems LTD	Partial evidence	Middleton, United KingdomHQ checked Sep 21, 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 21, 2026
20	Ajar Technology	Strong evidence	Brentford, United KingdomHQ checked Sep 21, 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 21, 2026
21	Identity E2e	Indirect evidence	Kent, United KingdomHQ checked Sep 21, 2026	51-200	41 contacts →
	Indirect evidence “IdentityE2E is a UK-based SME founded in 2013, grounded in honesty, integrity, and an unwavering commitment to delivery.” Source: RevenueBase Database · checked Sep 21, 2026
22	Intelisense IT	Indirect evidence	Wolverhampton, United KingdomHQ checked Sep 21, 2026	201-500	39 contacts →
	Indirect evidence “Intelisense IT specialise in the delivery of world class business solutions.” Source: RevenueBase Database · checked Sep 21, 2026
23	Astro Communications LTD	Indirect evidence	Dartford, United KingdomHQ checked Sep 21, 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 21, 2026
24	Lan2lan	Partial evidence	Leatherhead, United KingdomHQ checked Sep 21, 2026	11-50	39 contacts →
	Partial evidence “LAN2LAN is a specialist systems integration, installation and project management organisation focused on driving technologically innovative solutions that deliver intelligent…” Source: RevenueBase Database · checked Sep 21, 2026
25	Stingray LTD	Indirect evidence	Reading, United KingdomHQ checked Sep 21, 2026	51-200	37 contacts →
	Indirect evidence 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: federal 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 federal systems integrators.
Partial evidence: Its own public description names part of federal systems integrators, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name federal 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 191 federal systems integrators based in the United Kingdom

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Federal systems integrators based in the United Kingdom at a glance

As of Sep 21, 2026

38.8%Verified-email coverage

24.0Average contacts per company

11-50Median size (employees)

31.4%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

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 191 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 federal 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 “federal 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 federal 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 federal 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, 1,775 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.

Federal systems integrators by metro

Federal systems integrators in London60

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 federal 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 federal systems integrators are there based in the United Kingdom?

RevenueBase identified 191 federal 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?

MTI, headquartered in Staines-Upon-Thames, tops this list with the largest team on record.

Which city has the most federal systems integrators?

London leads with 60 headquartered companies, followed by Manchester (6) and Bristol (4).

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 1,775 verified decision-maker contacts tracked across these 191 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.