Company lists · Data refreshed September 2026

Top 25 I.t. consulting firms based in London, United Kingdom

Name: I.t. consulting firms based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 26, 2026 1,757 companies tracked

RevenueBase identified 1,757 i.t. consulting firms headquartered in London, United Kingdom as of September 2026 and tracks 36,451 professional contacts across them, including 13,840 with verified work emails. London is the largest hub.

This list covers i.t. consulting firms 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 26, 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 26, 2026 86% judged on-target in blind review

1,757Companies

36,451Contacts tracked

13,840Verified emails

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The 25 largest i.t. consulting firms based in London, United Kingdom

Ranked by team size

Top 25 of 1,757 i.t. consulting firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 26, 2026. RevenueBase Smart Search rates how each company's information relates to i.t. consulting firms: 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 26, 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 26, 2026
2	Computer Futures	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	501-1,000	2,673 contacts →
	Indirect evidence “Building tomorrow’s tech landscape together Computer Futures is a Technology specialist, part of SThree, the global STEM workforce consultancy.” Source: RevenueBase Database · checked Sep 26, 2026
3	Nashtech	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	1,001-5,000	1,611 contacts →
	Indirect evidence “We are experts in technology, delivering smart solutions that solve business challenges and create value.” Source: RevenueBase Database · checked Sep 26, 2026
4	K2 Partnering Solutions	Indirect evidence	London, United KingdomHQ checked Sep 26, 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 26, 2026
5	NSC Global	Partial evidence	London, United KingdomHQ checked Sep 26, 2026	1,001-5,000	1,039 contacts →
	Partial evidence “Global business doesn’t have to be complicated.” Source: RevenueBase Database · checked Sep 26, 2026
6	Advania UK	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	1,001-5,000	910 contacts →
	Indirect evidence “We empower people to create sustainable value with the clever use of technology.” Source: RevenueBase Database · checked Sep 26, 2026
7	Alten LTD - UK	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	10001+	529 contacts →
	Indirect evidence “We are a leading Engineering and IT consultancy operating across all sectors in 30 different countries.” Source: RevenueBase Database · checked Sep 26, 2026
8	Zenzero	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	501-1,000	401 contacts →
	Indirect evidence “We believe successful businesses are underpinned by quality IT infrastructure.” Source: RevenueBase Database · checked Sep 26, 2026
9	Hirexa Solutions	Indirect evidence	London, United KingdomHQ checked Sep 26, 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 26, 2026
10	Sandhata Technologies	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	201-500	363 contacts →
	Indirect evidence “We are a global niche consultancy specialising in services that span all facets of Digital transformation, DevOps, and System Integration.” Source: RevenueBase Database · checked Sep 26, 2026
11	Ubique Systems	Partial evidence	London, United KingdomHQ checked Sep 26, 2026	501-1,000	333 contacts →
	Partial evidence “Ubique Systems is a fast growing multifaceted organization which offers a comprehensive array of outsourcing and consulting services for its customers, including recruitment…” Source: RevenueBase Database · checked Sep 26, 2026
12	Cartesian	Partial evidence	London, United KingdomHQ checked Sep 26, 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 26, 2026
13	Flat Rock Technology	Indirect evidence	London, United KingdomHQ checked Sep 26, 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 26, 2026
14	Natilik	Indirect evidence	London, United KingdomHQ checked Sep 26, 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 26, 2026
15	Cisilion	Indirect evidence	London, United KingdomHQ checked Sep 26, 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 26, 2026
16	BIP UK	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	5,001-10,000	167 contacts →
	Indirect evidence “BIP is the international consultancy for the 21st century with over 6,500 consultants globally daring to make a difference.” Source: RevenueBase Database · checked Sep 26, 2026
17	CVL	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	n/a	165 contacts →
	Indirect evidence “Strategic development for already dynamic businesses, successful mergers & acquisitions between household names, technology planning in cutting edge industries and real-world…” Source: RevenueBase Database · checked Sep 26, 2026
18	Interex Group	Indirect evidence	London, United KingdomHQ checked Sep 26, 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 26, 2026
19	Dogma Group	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	51-200	149 contacts →
	Indirect evidence “The Dogma Group is a progressive digital transformation company committed to delivering the digital imperative and becoming the most trusted advisor to its clientele.” Source: RevenueBase Database · checked Sep 26, 2026
20	IBU	Partial evidence	London, United KingdomHQ checked Sep 26, 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 26, 2026
21	Opticoreit	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	51-200	120 contacts →
	Indirect 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 26, 2026
22	Glue Reply	Indirect evidence	London, United KingdomHQ checked Sep 26, 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 26, 2026
23	Axiom Software Solutions Limited	Partial evidence	London, United KingdomHQ checked Sep 26, 2026	201-500	114 contacts →
	Partial evidence “Axiom is a global information technology, consulting and outsourcing company and services provider.” Source: RevenueBase Database · checked Sep 26, 2026
24	Oryxalign	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	51-200	99 contacts →
	Indirect evidence “OryxAlign creates true alignment that delivers the right outcomes for all.” Source: RevenueBase Database · checked Sep 26, 2026
25	Xynotech	Partial evidence	London, United KingdomHQ checked Sep 26, 2026	51-200	96 contacts →
	Partial evidence “Xynotech is a provider of IT consulting and software development services that help companies overtake their competition.” Source: RevenueBase Database · checked Sep 26, 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: i.t. consulting firms. 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 i.t. consulting firms.
Partial evidence: Its own public description names part of i.t. consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name i.t. consulting firms. 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 1,757 i.t. consulting firms based in London, United Kingdom

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I.t. consulting firms based in London, United Kingdom at a glance

As of Sep 26, 2026

38.0%Verified-email coverage

20.7Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 26, 2026Page data refreshed

Companies by employee count

1-10

992

11-50

500

51-200

183

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 1,757 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 i.t. consulting firms, 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 “i.t. consulting firms”. 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 i.t. consulting firms), 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 i.t. consulting firms, 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, 13,840 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 26, 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.

I.t. consulting firms by metro in the United Kingdom

I.t. consulting firms in London1757
I.t. consulting firms in Manchester110
I.t. consulting firms in Birmingham85
I.t. consulting firms in Bristol60
I.t. consulting firms in Leeds58
I.t. consulting firms in Reading55
I.t. consulting firms in Edinburgh47
I.t. consulting firms in Milton Keynes46
I.t. consulting firms in Glasgow44
I.t. consulting firms in Coventry37
I.t. consulting firms in Cambridge35
I.t. consulting firms in Sheffield35
I.t. consulting firms in Cardiff28

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 i.t. consulting firms, 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 i.t. consulting firms are there based in London, United Kingdom?

RevenueBase identified 1,757 i.t. consulting firms 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 i.t. consulting firms?

London leads with 1757 headquartered companies, followed by Manchester (110) and Birmingham (85).

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 13,840 verified decision-maker contacts tracked across these 1,757 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 26, 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.