Company lists · Data refreshed September 2026
Top 25 Improvement consulting firms based in the United Kingdom
RevenueBase identified 9,387 improvement consulting firms headquartered in the United Kingdom as of September 2026 and tracks 54,720 professional contacts across them, including 17,973 with verified work emails and 4,388 with mobile numbers. London is the largest hub.
This list covers improvement consulting firms headquartered in the 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.
The 25 largest improvement consulting firms based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 2,179 contacts → | ||||
Partial evidence “Baringa is a global consulting firm that helps leaders drive meaningful change and create value.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,011 contacts → | ||||
Indirect evidence “At OC & C Strategy Consultants we have more than 35 years of experience at unpicking the most complex business challenges with simple, uncommon sense™.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 3 | 383 contacts → | ||||
Indirect evidence “At Scott Logic, we design and build software that transforms the performance of some of the world’s biggest and most demanding organisations.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 4 | 360 contacts → | ||||
Indirect evidence “Softwire exists to help organisations use technology to deliver meaningful outcomes and a positive impact for themselves, their users and the world.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 5 | 357 contacts → | ||||
Indirect evidence “We are now Inizio Ignite, the global advisory partner for health and life sciences, encompassing connected expertise across Research Partnership, Putnam, Vynamic, and STEM.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 6 | 351 contacts → | ||||
Indirect evidence “Emergn is a global technology and management consultancy built on a simple conviction: the only sustainable competitive advantage is the way you work.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 7 | 344 contacts → | ||||
Indirect evidence “Q5 is a global, award-winning management consultancy focused on building healthy, high-performing organisations.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 8 | 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, 2026Thanks. The Data Team will review it. | |||||
| 9 | 297 contacts → | ||||
Indirect evidence “Pareto partner globally with organisations to take people from learning to leading.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 10 | 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 26, 2026Thanks. The Data Team will review it. | |||||
| 11 | 247 contacts → | ||||
Partial evidence “We’re a dynamic consulting firm, focused on delivering change.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 12 | 245 contacts → | ||||
Indirect evidence “Percipere is a niche global consultancy, partnering companies in their evolution towards greater operational efficiency and profitability.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 13 | 244 contacts → | ||||
Indirect evidence “Sheffield Haworth is a global consultancy founded in 1993.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 14 | 240 contacts → | ||||
Partial evidence “Albany Beck is a client-first consulting firm helping financial services organisations deliver complex change and build capability, not dependency.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 15 | 219 contacts → | ||||
Indirect evidence “As a global leader in service management, we help businesses transform their operations with data-driven insights, scalable digital solutions, and measurable results.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 16 | 216 contacts → | ||||
Indirect evidence “Quantzig is at the forefront of partnering with businesses to help them unlock transformative value through analytics solutions.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 17 | 198 contacts → | ||||
Indirect evidence “OIM is dedicated to building competitive organisations.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 18 | 191 contacts → | ||||
Indirect evidence “Clarify helps global Technology companies achieve sustained and significant commercial success.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 19 | 189 contacts → | ||||
Indirect evidence “Cambridge Education is a global leader in providing consultancy services to government agencies at national and local level, and to international development agencies and…” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 20 | 178 contacts → | ||||
Indirect evidence “The future has never moved this fast.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 21 | 170 contacts → | ||||
Partial evidence “We are an employee-owned, award-winning international consulting firm that believes there’s a better way to do consultancy.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 22 | 166 contacts → | ||||
Indirect evidence “In an uncertain, complex, and ambiguous world, business change is essential and inevitable.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 23 | 152 contacts → | ||||
Indirect evidence “Founded in 1990, The Berkeley Partnership is an independent management consultancy, specialising in business transformation.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 24 | 142 contacts → | ||||
Indirect evidence “At Sysdoc we exist to help our clients to transform, adapt and operate in order for them to achieve their ambitions, and to provide our own people with opportunities that allow…” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
| 25 | 139 contacts → | ||||
Indirect evidence “We believe that change is an opportunity to thrive.” Source: RevenueBase Database · checked Sep 26, 2026Thanks. The Data Team will review it. | |||||
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: improvement 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 improvement consulting firms.
- Partial evidence
- Its own public description names part of improvement consulting firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name improvement 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 9,387 improvement consulting firms based in the United Kingdom
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Improvement consulting firms based in the United Kingdom at a glance
As of Sep 26, 2026Companies by employee count
Freshness & accuracy
How recently the business emails were verified and the company information checked
Email last verified
Median 28.0dCompany record updated
Median 78.0dHow 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 improvement 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 the United Kingdom whose own description of what they do matches “improvement 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 improvement 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 improvement consulting firms, and records with no verified work email. Companies headquartered outside United Kingdom 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, 17,973 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.
Improvement consulting firms by metro
- Improvement consulting firms in London3332
- Improvement consulting firms in Manchester204
- Improvement consulting firms in Bristol116
- Improvement consulting firms in Glasgow110
- Improvement consulting firms in Edinburgh104
- Improvement consulting firms in Leeds100
- Improvement consulting firms in Birmingham98
- Improvement consulting firms in Cambridge84
- Improvement consulting firms in Oxford73
- Improvement consulting firms in Reading71
- Improvement consulting firms in Sheffield62
- Improvement consulting firms in Nottingham54
- Improvement consulting firms in Milton Keynes51
- Improvement consulting firms in Brighton48
- Improvement consulting firms in Cardiff44
- Improvement consulting firms in York44
- Improvement consulting firms in Derby43
- Improvement consulting firms in Belfast41
- Improvement consulting firms in Liverpool41
- Improvement consulting firms in Southampton39
- Improvement consulting firms in Bath37
- Improvement consulting firms in Coventry34
- Improvement consulting firms in Chester33
- Improvement consulting firms in Guildford33
- Improvement consulting firms in Cheltenham31
- Improvement consulting firms in Leicester31
- Improvement consulting firms in Northampton31
- Improvement consulting firms in Bournemouth29
- Improvement consulting firms in Harrogate29
- Improvement consulting firms in Newcastle Upon Tyne28
- Improvement consulting firms in Winchester28
- Improvement consulting firms in Lincoln27
- Improvement consulting firms in Warrington27
- Improvement consulting firms in Aberdeen25
- Improvement consulting firms in Solihull25
- Improvement consulting firms in Swindon25
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 improvement 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 improvement consulting firms are there based in the United Kingdom?
RevenueBase identified 9,387 improvement consulting firms headquartered in the 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?
Baringa, headquartered in London, tops this list with the largest team on record.
Which city has the most improvement consulting firms?
London leads with 3332 headquartered companies, followed by Manchester (204) and Bristol (116).
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 17,973 verified decision-maker contacts tracked across these 9,387 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.
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