Company lists · Data refreshed September 2026

Top 25 IT professional services companies based in London, United Kingdom

Name: IT professional services companies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 27, 2026 1,505 companies tracked

RevenueBase identified 1,505 IT professional services companies headquartered in London, United Kingdom as of September 2026 and tracks 30,512 professional contacts across them, including 11,685 with verified work emails. London is the largest hub.

This list covers IT professional services companies headquartered in London, 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 27, 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 27, 2026 86% judged on-target in blind review

1,505Companies

30,512Contacts tracked

11,685Verified emails

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The 25 largest IT professional services companies based in London, United Kingdom

Ranked by team size

Top 25 of 1,505 IT professional services companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to IT professional services 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	Endava	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	10001+	9,653 contacts →
	Indirect evidence “For over two decades, we have been harnessing technology to drive meaningful change.” Source: RevenueBase Database · checked Sep 27, 2026
2	K2 Partnering Solutions	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	1,001-5,000	1,417 contacts →
	Indirect evidence “K2 Partnering Solutions is a global provider of unique end-to-end consultative solutions in the enterprise applications, AI, and cloud space.” Source: RevenueBase Database · checked Sep 27, 2026
3	CDW UK	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	1,001-5,000	1,245 contacts →
	Indirect evidence “We offer a full-stack, full-lifecycle approach to technology, leveraging our extensive solutions, services and brand relationships to meet your organization’s unique needs.” Source: RevenueBase Database · checked Sep 27, 2026
4	NSC Global	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	1,001-5,000	1,039 contacts →
	Indirect evidence “Global business doesn’t have to be complicated.” Source: RevenueBase Database · checked Sep 27, 2026
5	Excis Compliance	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	1,001-5,000	616 contacts →
	Partial evidence “Excis is a trusted global IT services company, delivering agile, multilingual support across 150+ countries.” Source: RevenueBase Database · checked Sep 27, 2026
6	Zenzero	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	501-1,000	401 contacts →
	Partial evidence “We believe successful businesses are underpinned by quality IT infrastructure.” Source: RevenueBase Database · checked Sep 27, 2026
7	Hirexa Solutions	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	201-500	377 contacts →
	Indirect evidence “Hirexa Solutions is a leading group of companies committed to delivering exceptional services to Fortune 500 clients worldwide.” Source: RevenueBase Database · checked Sep 27, 2026
8	Total IT Global	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	201-500	286 contacts →
	Partial 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 27, 2026
9	Flat Rock Technology	Indirect evidence	London, United KingdomHQ checked Sep 27, 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 27, 2026
10	Natilik	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	201-500	222 contacts →
	Indirect evidence “Natilik is your technology solutions partner and confident guide to digital transformation, specialising in a range of solutions to help you achieve your goals and drive real…” Source: RevenueBase Database · checked Sep 27, 2026
11	Cisilion	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	194 contacts →
	Indirect evidence “Combining market-leading tech with world-class service, we go above and beyond expectations to ensure our clients are ready for a digital future.” Source: RevenueBase Database · checked Sep 27, 2026
12	Interex Group	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	160 contacts →
	Indirect evidence “InterEx Group is becoming the strategic partner of choice for organizations undergoing digital, business, and technology transformation.” Source: RevenueBase Database · checked Sep 27, 2026
13	IBU	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	1,001-5,000	139 contacts →
	Indirect evidence “We are the most trusted consulting & Information Technology service partner, who has been thriving hard to deliver customer-centric and proven global competence to our clients all…” Source: RevenueBase Database · checked Sep 27, 2026
14	Opticoreit	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	120 contacts →
	Partial evidence “OpticoreIT is an IT Consultancy founded in 2013 to bridge a gap in the market between the major IT services providers and the consultancy market.” Source: RevenueBase Database · checked Sep 27, 2026
15	Glue Reply	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	118 contacts →
	Partial 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 27, 2026
16	Netbuilder	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	107 contacts →
	Indirect evidence “NETbuilder is a leading provider of specialist software, consulting, and fully managed services to Government, Finance, Healthcare, Education, and Commercial markets.” Source: RevenueBase Database · checked Sep 27, 2026
17	Oryxalign	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	99 contacts →
	Indirect evidence “OryxAlign creates true alignment that delivers the right outcomes for all.” Source: RevenueBase Database · checked Sep 27, 2026
18	Matsco Solutions	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	96 contacts →
	Partial evidence “Matsco Solutions is a global managed IT service provider built exclusively for the financial services industry.” Source: RevenueBase Database · checked Sep 27, 2026
19	Field Work Technologies LTD	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	96 contacts →
	Indirect evidence “Promise to deliver Servicing Certainty worldwide.” Source: RevenueBase Database · checked Sep 27, 2026
20	Scsk Europe LTD	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	92 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 27, 2026
21	Geecon Systems	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	92 contacts →
	Partial evidence “Headquartered in London, United Kingdom, Geecon combines a passion for Client Satisfaction, Technology Innovation, Business and Management Consultancy, Software Solution and IT…” Source: RevenueBase Database · checked Sep 27, 2026
22	OVYO	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	91 contacts →
	Indirect evidence “Ovyo provides rapid access to specialist people and teams in software engineering, operations & delivery throughout the streaming/OTT/media, satellite/space and comms industries.” Source: RevenueBase Database · checked Sep 27, 2026
23	Sysgroup	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	89 contacts →
	Partial evidence “SysGroup is the services leader for realising AI transformation, as an award-winning managed IT services, cloud hosting, and IT consultancy provider.” Source: RevenueBase Database · checked Sep 27, 2026
24	Redex IT Limited	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	89 contacts →
	Partial evidence “Ultimate IT solutions.” Source: RevenueBase Database · checked Sep 27, 2026
25	Technimove	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	87 contacts →
	Indirect evidence “We are Technimove.” Source: RevenueBase Database · checked Sep 27, 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: IT professional services 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 IT professional services companies.
Partial evidence: Its own public description names part of IT professional services companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name IT professional services 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 1,505 IT professional services companies based in London, United Kingdom

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IT professional services companies based in London, United Kingdom at a glance

As of Sep 27, 2026

38.3%Verified-email coverage

20.3Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

817

11-50

454

51-200

162

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 1,505 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 IT professional services 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 London, United Kingdom whose own description of what they do matches “IT professional services 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 IT professional services 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 IT professional services companies, and records with no verified work email. Companies headquartered outside London 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, 11,685 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 27, 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.

IT professional services companies by metro in the United Kingdom

IT professional services companies in London1505
IT professional services companies in Manchester98
IT professional services companies in Birmingham88
IT professional services companies in Bristol65
IT professional services companies in Leeds56
IT professional services companies in Reading48
IT professional services companies in Edinburgh43
IT professional services companies in Sheffield40
IT professional services companies in Glasgow38
IT professional services companies in Milton Keynes38
IT professional services companies in Coventry31
IT professional services companies in Cambridge28
IT professional services companies in Nottingham26
IT professional services companies in Harrow25
IT professional services companies in Northampton25

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 IT professional services 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 IT professional services companies are there based in London, United Kingdom?

RevenueBase identified 1,505 IT professional services companies headquartered in London, 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?

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

Which city has the most IT professional services companies?

London leads with 1505 headquartered companies, followed by Manchester (98) and Birmingham (88).

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 11,685 verified decision-maker contacts tracked across these 1,505 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 27, 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.