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 company matches for business IT consulting firms associated with London, United Kingdom as of September 2026 and tracks 14,646 professional contacts across them, including 4,892 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers company matches for business IT consulting firms associated with London, United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 23, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 23, 2026 How this list was built

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 company matches for business IT consulting firms based in London, United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 23, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Noventiq	Exact match	London, United KingdomHQ recorded Sep 23, 2026	5,001-10,000	1,508 contacts →
	Exact match “Noventiq (Noventiq Holdings PLC) is a leading global solutions and services provider in digital transformation and cybersecurity, headquartered in London.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
2	Zenzero	Exact match	London, United KingdomHQ recorded Sep 23, 2026	501-1,000	401 contacts →
	Exact match “We believe successful businesses are underpinned by quality IT infrastructure.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
3	Cartesian	Exact match	London, United KingdomHQ recorded Sep 23, 2026	201-500	302 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
4	KOCHO	Exact match	London, United KingdomHQ recorded Sep 23, 2026	201-500	295 contacts →
	Exact match “At Kocho, we believe greatness lies in everyone.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
5	Elixirr	Exact match	London, United KingdomHQ recorded Sep 23, 2026	501-1,000	275 contacts →
	Exact match “An award-winning global consulting firm working with clients across a diverse range of markets, industries and geographies.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
6	Flat Rock Technology	Exact match	London, United KingdomHQ recorded Sep 23, 2026	201-500	231 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
7	CVL	Exact match	London, United KingdomHQ recorded Sep 23, 2026	n/a	165 contacts →
	Exact match “Strategic development for already dynamic businesses, successful mergers & acquisitions between household names, technology planning in cutting edge industries and real-world…” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
8	Trpglobal	Exact match	London, United KingdomHQ recorded Sep 23, 2026	51-200	126 contacts →
	Exact match “We are TRPGLOBAL, your strategic partner in helping you with the complexities of risk management.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
9	Athens	Exact match	London, United KingdomHQ recorded Sep 23, 2026	11-50	122 contacts →
	Exact match “Athens helps clients make superior investment decisions and supports them to deliver value from these decisions through timely implementation.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
10	Glue Reply	Exact match	London, United KingdomHQ recorded Sep 23, 2026	51-200	118 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
11	Conosco	Exact match	London, United KingdomHQ recorded Sep 23, 2026	51-200	105 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
12	Oryxalign	Exact match	London, United KingdomHQ recorded Sep 23, 2026	51-200	99 contacts →
	Exact match “OryxAlign creates true alignment that delivers the right outcomes for all.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
13	Valentia Partners	Exact match	London, United KingdomHQ recorded Sep 23, 2026	51-200	94 contacts →
	Exact match “Valentia Partners is a specialist Management Consulting firm.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
14	Constor Solutions	Exact match	London, United KingdomHQ recorded Sep 23, 2026	51-200	87 contacts →
	Exact match “At Constor Solutions, we believe that technology is the backbone of a successful business.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
15	ITC Secure	Exact match	London, United KingdomHQ recorded Sep 23, 2026	51-200	87 contacts →
	Exact match “ITC Secure is an advisory-led cyber security services company.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
16	Intuition IT Intuitive Technology Recruitment	Exact match	London, United KingdomHQ recorded Sep 23, 2026	11-50	84 contacts →
	Exact match “IT'S NOT RECRUITMENT.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
17	SAT Microsystems	Exact match	London, United KingdomHQ recorded Sep 23, 2026	51-200	84 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
18	Baseel Partners	Exact match	London, United KingdomHQ recorded Sep 23, 2026	1,001-5,000	78 contacts →
	Exact match “We offer a broad portfolio of IT and consulting services covering Governance and Strategy, Cloud, Data, Cybersecurity, Infrastructure and Applications, Managed IT and Security.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
19	Eden Mccallum	Exact match	London, United KingdomHQ recorded Sep 23, 2026	51-200	75 contacts →
	Exact match “We redefined management consulting to make it better for clients and better for consultants.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
20	Instant On IT	Exact match	London, United KingdomHQ recorded Sep 23, 2026	51-200	69 contacts →
	Exact match “Helping businesses accomplish more IT Management, Strategy and Cloud, IT Security and AI Solutions Office locations: Central London, New Zealand” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
21	NEW Link Consulting	Exact match	London, United KingdomHQ recorded Sep 23, 2026	51-200	69 contacts →
	Exact match “In complex transformation programmes, risk, regulation, financial crime, data, technology and operations no longer sit in separate silos.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
22	6point6 Part Of Accenture	Exact match	London, United KingdomHQ recorded Sep 23, 2026	201-500	68 contacts →
	Exact match “6point6 drives the right change in an organisation through the positive impact of technology.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
23	Axtrum Technologies	Exact match	London, United KingdomHQ recorded Sep 23, 2026	51-200	68 contacts →
	Exact match “We don’t only deliver a change – We deliver a change that adds value and delivers business benefit that is real, tangible and measurable!” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
24	Wizard Group	Exact match	London, United KingdomHQ recorded Sep 23, 2026	51-200	61 contacts →
	Exact match “The Wizard group consists of 4 companies all within the information technology and cybersecurity industry.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
25	Northdoor PLC	Exact match	London, United KingdomHQ recorded Sep 23, 2026	51-200	60 contacts →
	Exact match “Northdoor is an award-winning London-based IT consultancy and managed services provider with over 30 years’ experience.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “business IT consulting firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 1,675 business IT consulting firms based in London, United Kingdom

See the full list, filter by size, metro and specialty, and access 4,892 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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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)

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

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with London, United Kingdom whose business descriptions match “business IT consulting firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 4,892 professional contacts with verified work emails across the full matched dataset. 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.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Business IT consulting firms by metro in the United Kingdom

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “business IT consulting firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

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

RevenueBase identified 1,675 company matches for business IT consulting firms associated with London, United Kingdom as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Noventiq tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United Kingdom has the most business IT consulting firms?

London leads the United Kingdom with 1,675 company records, 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 limited free results with 500 credits to start. Upgrading provides access to the 4,892 professional contacts with verified work emails tracked across these 1,675 companies; direct dials are available where recorded.

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 SmartSearch, 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.