Company lists · Data refreshed September 2026

Top 25 IT strategy consultants based in London, United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 562 companies tracked

RevenueBase identified 562 IT strategy consultants headquartered in London, United Kingdom as of September 2026 and tracks 20,845 professional contacts across them, including 9,684 with verified work emails. London is the largest hub.

This list covers IT strategy consultants 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 20, 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 20, 2026 86% judged on-target in blind review

562Companies

20,845Contacts tracked

9,684Verified emails

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The 25 largest IT strategy consultants based in London, United Kingdom

Ranked by team size

Top 25 of 562 IT strategy consultants based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to IT strategy consultants: 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	Ey-Parthenon	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	10001+	17,070 contacts →
	Partial evidence “Our unique combination of transformative strategy, transactions and corporate finance delivers real-world value – solutions that work in practice, not just on paper.” Source: RevenueBase Database · checked Sep 20, 2026
2	Zenzero	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	501-1,000	401 contacts →
	Partial evidence “We believe successful businesses are underpinned by quality IT infrastructure.” Source: RevenueBase Database · checked Sep 20, 2026
3	Cartesian	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	302 contacts →
	Indirect 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 20, 2026
4	Opticoreit	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	120 contacts →
	Strong 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 20, 2026
5	Glue Reply	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	118 contacts →
	Strong 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 20, 2026
6	Oaklin	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	115 contacts →
	Partial evidence “Oaklin is an independent management consultancy.” Source: RevenueBase Database · checked Sep 20, 2026
7	Baseel Partners	Strong evidence	London, United KingdomHQ checked Sep 20, 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 20, 2026
8	Eden Mccallum	Strong evidence	London, United KingdomHQ checked Sep 20, 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 20, 2026
9	Change Management Group	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	74 contacts →
	Indirect evidence “Whether complex transformation is required across your business or you are seeking support with a small project, we are here to help.” Source: RevenueBase Database · checked Sep 20, 2026
10	Axtrum Technologies	Indirect evidence	London, United KingdomHQ checked Sep 20, 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 20, 2026
11	Ziipline	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	59 contacts →
	Indirect evidence “We’re people-first and culture-obsessed.” Source: RevenueBase Database · checked Sep 20, 2026
12	Decision Inc. UK	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	35 contacts →
	Indirect evidence “Decision Inc.” Source: RevenueBase Database · checked Sep 20, 2026
13	ECC	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	35 contacts →
	Partial evidence “Established in 2007, ecc (formerly Easy Computer Consultants Ltd) was set up by Antony Liffmann and David Taylor.” Source: RevenueBase Database · checked Sep 20, 2026
14	Expert Thinking	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	34 contacts →
	Indirect evidence “Make cloud work for you, not against you.” Source: RevenueBase Database · checked Sep 20, 2026
15	3h Partners	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	32 contacts →
	Indirect evidence “3H Partners was founded in 2005, when consulting professionals and professors at leading European Universities and Business Schools joined forces to create a new kind of…” Source: RevenueBase Database · checked Sep 20, 2026
16	Maple Networks	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	30 contacts →
	Partial evidence “We’re the team that the IT leaders of tech-dependant organisations come to when they need to really shake things up, innovate (effectively), and tackle their transformational…” Source: RevenueBase Database · checked Sep 20, 2026
17	Searchlight Consulting	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	30 contacts →
	Partial evidence “Searchlight is an independent consultancy focused on building business capabilities and leveraging technology to drive business transformation.” Source: RevenueBase Database · checked Sep 20, 2026
18	Technology Transformation Group	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	26 contacts →
	Indirect evidence “Every business is unique in its setup, processes, and goals.” Source: RevenueBase Database · checked Sep 20, 2026
19	JP Reis	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	26 contacts →
	Indirect evidence “JP Reis helps financial trading organizations make better technology decisions and deliver complex transformation programs with confidence.” Source: RevenueBase Database · checked Sep 20, 2026
20	Clearpath Partnership	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	22 contacts →
	Partial evidence “ClearPath Partnership assist clients in the development and delivery of strategic initiatives and business transformation.” Source: RevenueBase Database · checked Sep 20, 2026
21	The Final Step	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	22 contacts →
	Indirect evidence “The Final Step helps you use technology to achieve your goals.” Source: RevenueBase Database · checked Sep 20, 2026
22	Veles Consulting LTD	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	22 contacts →
	Partial evidence “Veles Consulting is a boutique advisory firm established by a group of seasoned business executives, elite management consultants, and accomplished entrepreneurs.” Source: RevenueBase Database · checked Sep 20, 2026
23	Voyager Solutions	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	20 contacts →
	Indirect evidence “Voyager Solutions provide business change and implementation support for process, people and technology transformation programmes.” Source: RevenueBase Database · checked Sep 20, 2026
24	Enterprise Blueprints	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	20 contacts →
	Strong evidence “Enterprise Blueprints is a boutique IT architecture consultancy formed by Architects focused on Architecture.” Source: RevenueBase Database · checked Sep 20, 2026
25	H3o Digital	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	17 contacts →
	Indirect evidence “H3O Digital provides enterprise class technical services for businesses of all sizes.” Source: RevenueBase Database · checked Sep 20, 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 strategy consultants. 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 strategy consultants.
Partial evidence: Its own public description names part of IT strategy consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name IT strategy consultants. 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 562 IT strategy consultants based in London, United Kingdom

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IT strategy consultants based in London, United Kingdom at a glance

As of Sep 20, 2026

46.5%Verified-email coverage

37.1Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

400

11-50

116

51-200

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 562 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 strategy consultants, 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 strategy consultants”. 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 strategy consultants), 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 strategy consultants, 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, 9,684 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 20, 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 strategy consultants 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 strategy consultants, 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 strategy consultants are there based in London, United Kingdom?

RevenueBase identified 562 IT strategy consultants 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?

Ey-Parthenon, headquartered in London, tops this list with the largest team on record.

Which city has the most IT strategy consultants?

London leads with 562 headquartered companies, followed by Manchester (32) and Bristol (25).

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 9,684 verified decision-maker contacts tracked across these 562 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 20, 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.