Company lists · Data refreshed September 2026

Top 25 Business IT consulting firms based in London, United Kingdom

Name: Business IT 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 23, 2026 1,675 companies tracked

RevenueBase identified 1,675 business IT consulting firms headquartered in London, United Kingdom as of September 2026 and tracks 14,646 professional contacts across them, including 4,892 with verified work emails. London is the largest hub.

This list covers business IT 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 23, 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 23, 2026 86% judged on-target in blind review

1,675Companies

14,646Contacts tracked

4,892Verified emails

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The 25 largest business IT consulting firms based in London, United Kingdom

Ranked by team size

Top 25 of 1,675 business IT consulting firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 23, 2026. RevenueBase Smart Search rates how each company's information relates to business IT 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	Noventiq	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	5,001-10,000	1,508 contacts →
	Indirect evidence “Noventiq (Noventiq Holdings PLC) is a leading global solutions and services provider in digital transformation and cybersecurity, headquartered in London.” Source: RevenueBase Database · checked Sep 23, 2026
2	Zenzero	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	501-1,000	401 contacts →
	Partial evidence “We believe successful businesses are underpinned by quality IT infrastructure.” Source: RevenueBase Database · checked Sep 23, 2026
3	Cartesian	Partial evidence	London, United KingdomHQ checked Sep 23, 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 23, 2026
4	KOCHO	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	201-500	295 contacts →
	Indirect evidence “At Kocho, we believe greatness lies in everyone.” Source: RevenueBase Database · checked Sep 23, 2026
5	Elixirr	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	501-1,000	275 contacts →
	Partial evidence “An award-winning global consulting firm working with clients across a diverse range of markets, industries and geographies.” Source: RevenueBase Database · checked Sep 23, 2026
6	Flat Rock Technology	Indirect evidence	London, United KingdomHQ checked Sep 23, 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 23, 2026
7	CVL	Indirect evidence	London, United KingdomHQ checked Sep 23, 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 23, 2026
8	Trpglobal	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	126 contacts →
	Indirect evidence “We are TRPGLOBAL, your strategic partner in helping you with the complexities of risk management.” Source: RevenueBase Database · checked Sep 23, 2026
9	Athens	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	11-50	122 contacts →
	Indirect evidence “Athens helps clients make superior investment decisions and supports them to deliver value from these decisions through timely implementation.” Source: RevenueBase Database · checked Sep 23, 2026
10	Glue Reply	Partial evidence	London, United KingdomHQ checked Sep 23, 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 23, 2026
11	Conosco	Indirect evidence	London, United KingdomHQ checked Sep 23, 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 23, 2026
12	Oryxalign	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	99 contacts →
	Indirect evidence “OryxAlign creates true alignment that delivers the right outcomes for all.” Source: RevenueBase Database · checked Sep 23, 2026
13	Valentia Partners	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	94 contacts →
	Partial evidence “Valentia Partners is a specialist Management Consulting firm.” Source: RevenueBase Database · checked Sep 23, 2026
14	Constor Solutions	Indirect evidence	London, United KingdomHQ checked Sep 23, 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 23, 2026
15	ITC Secure	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	87 contacts →
	Indirect evidence “ITC Secure is an advisory-led cyber security services company.” Source: RevenueBase Database · checked Sep 23, 2026
16	Intuition IT Intuitive Technology Recruitment	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	11-50	84 contacts →
	Partial evidence “IT'S NOT RECRUITMENT.” Source: RevenueBase Database · checked Sep 23, 2026
17	SAT Microsystems	Partial evidence	London, United KingdomHQ checked Sep 23, 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 23, 2026
18	Baseel Partners	Strong evidence	London, United KingdomHQ checked Sep 23, 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 23, 2026
19	Eden Mccallum	Strong evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	75 contacts →
	Strong evidence “We redefined management consulting to make it better for clients and better for consultants.” Source: RevenueBase Database · checked Sep 23, 2026
20	Instant On IT	Partial evidence	London, United KingdomHQ checked Sep 23, 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 23, 2026
21	NEW Link Consulting	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	69 contacts →
	Indirect evidence “In complex transformation programmes, risk, regulation, financial crime, data, technology and operations no longer sit in separate silos.” Source: RevenueBase Database · checked Sep 23, 2026
22	6point6 Part Of Accenture	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	201-500	68 contacts →
	Indirect evidence “6point6 drives the right change in an organisation through the positive impact of technology.” Source: RevenueBase Database · checked Sep 23, 2026
23	Axtrum Technologies	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	68 contacts →
	Indirect evidence “We don’t only deliver a change – We deliver a change that adds value and delivers business benefit that is real, tangible and measurable!” Source: RevenueBase Database · checked Sep 23, 2026
24	Wizard Group	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	61 contacts →
	Indirect evidence “The Wizard group consists of 4 companies all within the information technology and cybersecurity industry.” Source: RevenueBase Database · checked Sep 23, 2026
25	Northdoor PLC	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	60 contacts →
	Partial evidence “Northdoor is an award-winning London-based IT consultancy and managed services provider with over 30 years’ experience.” Source: RevenueBase Database · checked Sep 23, 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: business IT 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 business IT consulting firms.
Partial evidence: Its own public description names part of business IT consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name business IT 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 1,675 business IT consulting firms based in London, United Kingdom

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Business IT consulting firms based in London, United Kingdom at a glance

As of Sep 23, 2026

33.4%Verified-email coverage

8.7Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 23, 2026Page data refreshed

Companies by employee count

1-10

1,150

11-50

364

51-200

110

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 1,675 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 business IT 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 “business IT 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 business IT 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 business IT 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, 4,892 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 23, 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.

Business IT consulting firms by metro in the United Kingdom

Business IT consulting firms in London1675
Business IT consulting firms in Manchester113
Business IT consulting firms in Birmingham64
Business IT consulting firms in Bristol62
Business IT consulting firms in Glasgow51
Business IT consulting firms in Leeds51
Business IT consulting firms in Edinburgh47
Business IT consulting firms in Reading42
Business IT consulting firms in Cambridge34
Business IT consulting firms in Liverpool29
Business IT consulting firms in Sheffield28
Business IT consulting firms in Cardiff27
Business IT consulting firms in Nottingham27
Business IT consulting firms in Coventry25
Business IT consulting firms in Leicester25
Business IT consulting firms in Milton Keynes25

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 business IT 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 business IT consulting firms are there based in London, United Kingdom?

RevenueBase identified 1,675 business IT 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?

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

Which city has the most business IT consulting firms?

London leads with 1675 headquartered companies, followed by Manchester (113) and Birmingham (64).

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 4,892 verified decision-maker contacts tracked across these 1,675 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 23, 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.