Company lists · Data refreshed September 2026

Top 25 IT consulting support companies based in London, United Kingdom

Name: IT consulting support 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 1,439 companies tracked

RevenueBase identified 1,439 IT consulting support companies headquartered in London, United Kingdom as of September 2026 and tracks 23,996 professional contacts across them, including 11,033 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers IT consulting support 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

1,439Companies

23,996Contacts tracked

11,033Verified emails

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The 25 largest IT consulting support companies based in London, United Kingdom

Ranked by team size

Top 25 of 1,439 IT consulting support 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 consulting support 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	Exponential-E	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	501-1,000	667 contacts →
	Indirect evidence “Innovation is at the core of Exponential-e, and has been since our inception in 2002.” Source: RevenueBase Database · checked Sep 27, 2026
3	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
4	Maintel	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	201-500	341 contacts →
	Indirect evidence “Maintel is a communications managed services provider.” Source: RevenueBase Database · checked Sep 27, 2026
5	Cartesian	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	201-500	302 contacts →
	Partial evidence “Cartesian is a specialist consulting firm focused on the global telecommunications, media, and technology industries and is now part of Bounteous, an AI services firm helping…” Source: RevenueBase Database · checked Sep 27, 2026
6	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
7	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
8	Wanstor	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	201-500	227 contacts →
	Partial evidence “Wanstor: Experience First \| AI Fluent \| Secure by Default Wanstor is a trusted Managed IT Services company that helps ambitious organisations leverage technology to achieve better…” Source: RevenueBase Database · checked Sep 27, 2026
9	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
10	Deepscale Technologies LTD	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	141 contacts →
	Partial evidence “Deepscale Technologies provide data center, enterprise & managed IT solutions across the globe that enhance how businesses operate.” Source: RevenueBase Database · checked Sep 27, 2026
11	IBU	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	1,001-5,000	139 contacts →
	Partial 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
12	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
13	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
14	TDM Group	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	115 contacts →
	Partial evidence “TDM Group Ltd is a global Managed Business IT Service (M-BiTS) provider – our holistic approach to managing and implementing IT considers the impact technology has on the entire…” Source: RevenueBase Database · checked Sep 27, 2026
15	Conosco	Indirect evidence	London, United KingdomHQ checked Sep 27, 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 27, 2026
16	Techary	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	102 contacts →
	Indirect evidence “At Techary, we believe technology should move as fast as your business.” 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	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
20	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
21	Constor Solutions	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	87 contacts →
	Indirect evidence “At Constor Solutions, we believe that technology is the backbone of a successful business.” Source: RevenueBase Database · checked Sep 27, 2026
22	SAT Microsystems	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	84 contacts →
	Partial evidence “SAT Microsystems is a proven IT Service Provider leader in developing innovative solutions that reduce business costs and complexity in Saudi Arabia, UAE, and 8 other countries.” Source: RevenueBase Database · checked Sep 27, 2026
23	Hybytes	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	201-500	79 contacts →
	Partial evidence “Hybytes is an offshore/domestic solution provider for IT and Management to business and industry.” Source: RevenueBase Database · checked Sep 27, 2026
24	Baseel Partners	Strong evidence	London, United KingdomHQ checked Sep 27, 2026	1,001-5,000	78 contacts →
	Strong evidence “We offer a broad portfolio of IT and consulting services covering Governance and Strategy, Cloud, Data, Cybersecurity, Infrastructure and Applications, Managed IT and Security.” Source: RevenueBase Database · checked Sep 27, 2026
25	Instant On IT	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	69 contacts →
	Partial evidence “Helping businesses accomplish more IT Management, Strategy and Cloud, IT Security and AI Solutions Office locations: Central London, New Zealand” 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 consulting support 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 consulting support companies.
Partial evidence: Its own public description names part of IT consulting support companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name IT consulting support 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 1,439 IT consulting support companies based in London, United Kingdom

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IT consulting support companies based in London, United Kingdom at a glance

As of Sep 27, 2026

46.0%Verified-email coverage

16.7Average contacts per company

1-10Median size (employees)

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

838

11-50

413

51-200

134

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 1,439 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 consulting support 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 consulting support 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 consulting support 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 consulting support 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, 11,033 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 consulting support companies by metro in the United Kingdom

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 consulting support 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 consulting support companies are there based in London, United Kingdom?

RevenueBase identified 1,439 IT consulting support 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 in the United Kingdom has the most IT consulting support companies?

London leads the United Kingdom with 1,439 headquartered companies, followed by Manchester (116) and Birmingham (89).

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 11,033 verified decision-maker contacts tracked across these 1,439 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.