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Company lists · Data refreshed September 2026

Top 25 Global consulting firms based in the United Kingdom

Compiled by the RevenueBase Data Team Data refreshed Sep 3, 2026 4,667 companies tracked

RevenueBase identified 4,667 global consulting firms headquartered in the United Kingdom as of September 2026 and tracks 47,921 professional contacts across them, including 13,179 with verified work emails and 5,900 with mobile numbers. London is the largest hub.

This list covers global 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, how directly it supports the match, and when it was last checked. Data refreshed September 3, 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 Match evidence on every row Refreshed Sep 3, 2026 86% judged on-target in blind review
4,667Companies
47,921Contacts tracked
13,179Verified emails
5,900Mobile numbers
Unlock all 4,667 companies Free signup · no credit card · 500 free credits

The 25 largest global consulting firms based in the United Kingdom

Ranked by team size
Top 25 of 4,667 global consulting firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 3, 2026. Evidence rates how directly each company's own description names global consulting firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#CompanyHeadquartersEmployeesContacts
1
ProtivitiStrong evidence
Leeds, United Kingdom5,001-10,0008,869

“Protiviti is a global consulting firm that delivers deep expertise, objective insights, a tailored approach and unparalleled collaboration to help leaders confidently face the…”

Source: company website · checked Sep 3, 2026
2
AZETSIndirect evidence
Truro, United Kingdom5,001-10,0005,643

“Azets is an international business advisory group, with local experts in 190 locations across eight countries, backed by progressive technology.”

Source: company website · checked Sep 3, 2026
3
NavigantStrong evidence
London, United Kingdom5,001-10,0001,034

“Guidehouse is a leading global provider of consulting services to the public and commercial markets with broad capabilities in management, technology, and risk consulting.”

Source: company website · checked Sep 3, 2026
4
BIP BrasilIndirect evidence
Londres, United Kingdom1,001-5,000615

“Somos uma consultoria internacional fundada na Itália em 2003 com um ecossistema em evolução que proporciona a transformação significativa nos grandes players do mercado devido à…”

Source: company website · checked Sep 3, 2026
5
Mazars In The UKIndirect evidence
London, United Kingdom1,001-5,000516
Source: company website · checked Sep 3, 2026
6
Leader Investment Group - LIGIndirect evidence
London, United Kingdom501-1,000452

“Leader Investment Group is a MNC & a worldwide pioneer in Management Consultation, Executive Consultation, Digital Transformation & IT.”

Source: company website · checked Sep 3, 2026
7
Q5Partial evidence
Leeds, United Kingdom501-1,000340

“Q5 is a global, award-winning consultancy specialising in 'organisational health' and performance.”

Source: company website · checked Sep 3, 2026
8
H&z Management ConsultingIndirect evidence
London, United Kingdom501-1,000287

“Welcome to H&Z We offer more than successful strategy development.”

Source: company website · checked Sep 3, 2026
9
SearginIndirect evidence
London, United Kingdom501-1,000275

“Seargin was founded to close the gap between traditional advisory and hands-on delivery - combining strategic insight with deep expertise in ERP, AI and data.”

Source: company website · checked Sep 3, 2026
10
ElixirrStrong evidence
London, United Kingdom501-1,000271

“An award-winning global consulting firm working with clients across a diverse range of markets, industries and geographies.”

Source: company website · checked Sep 3, 2026
11
TransformPartial evidence
London, United Kingdom201-500258

“Transform is a fresh alternative to Big Consulting.”

Source: company website · checked Sep 3, 2026
12
Moorhouse B Corp CertifiedPartial evidence
London, United Kingdom201-500249

“We’re a dynamic consulting firm, focused on delivering change.”

Source: company website · checked Sep 3, 2026
13
Sheffield HaworthPartial evidence
London, United Kingdom201-500241

“Sheffield Haworth is a global consultancy founded in 1993.”

Source: company website · checked Sep 3, 2026
14
Albany BeckPartial evidence
London, United Kingdom201-500236

“Albany Beck is a client-first consulting firm helping financial services organisations deliver complex change and build capability, not dependency.”

Source: company website · checked Sep 3, 2026
15
Horwath HTLIndirect evidence
London, United Kingdom201-500200

“Bold steps forward.”

Source: company website · checked Sep 3, 2026
16
EIDRAPartial evidence
London, United Kingdom1,001-5,000182

“Eidra is a consultancy collective combining consulting, creativity, engineering and data to help leaders create great change.”

Source: company website · checked Sep 3, 2026
17
BIP UKPartial evidence
London, United Kingdom5,001-10,000165

“BIP is the international consultancy for the 21st century with over 6,500 consultants globally daring to make a difference.”

Source: company website · checked Sep 3, 2026
18
Oxford LeadershipPartial evidence
London, United Kingdom201-50088

“We are a global performance transformation agency, partnering with multinational corporations, international organisations, and governments to guide courageous transformation for…”

Source: company website · checked Sep 3, 2026
19
Punter SouthallIndirect evidence
London, United Kingdom201-50073

“Punter Southall is a group of companies with one aim – helping businesses and people make better decisions.”

Source: company website · checked Sep 3, 2026
20
Senn Delaney, A Heidrick & Struggles CompanyIndirect evidence
Richmond Upon Thames, United Kingdom1,001-5,00051

“Founded in 1978, Senn Delaney is widely recognized as the leading international authority and successful practitioner of culture shaping that enhances the spirit and performance…”

Source: company website · checked Sep 3, 2026
21
Mansion House ConsultingPartial evidence
London, United Kingdom201-50039

“Mansion House Consulting (MHC) is an international business and technology Consultancy focused exclusively on the Financial Services sector.”

Source: company website · checked Sep 3, 2026
22
Charles MarcusIndirect evidence
London, United Kingdom201-50036

“Charles Marcus is our multinational network of consultancy firms.”

Source: company website · checked Sep 3, 2026
23
Cambridge Consulting ServicesPartial evidence
London, United Kingdom201-50029

“Cambridge consulting is a key regional player in management consulting and management services in the Middle East & Africa.”

Source: company website · checked Sep 3, 2026
24
The S&a Transform GroupPartial evidence
London, United Kingdom201-50027

“Established in 2009, The S&A Transform Group,(formerly known as The Strategy & Architecture Group) is a leading provider of Business, Technology & Digital Consulting, Solutions…”

Source: company website · checked Sep 3, 2026
25
London Management Centre LMCIndirect evidence
London, United Kingdom201-50025

“LMC brings together the latest international management thinking and business strategies, using them to transform personal, team and organisational performance.”

Source: company website · checked Sep 3, 2026

Showing 25 of 4,667 global consulting firms based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 13,179 reachable decision-makers.

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Global consulting firms based in the United Kingdom at a glance

As of Sep 3, 2026
1-10Median size (employees)
LondonLargest hub · 1768 HQs
5,900Contacts with mobile numbers
Sep 3, 2026Data refreshed

Companies by employee count

1-10
3,585
11-50
673
51-200
167
201-500
31
501-1,000
10
1,001-5,000
16
5,001-10,000
6

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 global consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “global consulting firms”. Matching reads each company's description, not its industry code or its name.
What we exclude
Companies whose own description does not clearly place them among global 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 an evidence 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, 13,179 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 3, 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.

Global consulting firms by metro

  • Global consulting firms in London1768
  • Global consulting firms in Manchester99
  • Global consulting firms in Bristol55
  • Global consulting firms in Glasgow53
  • Global consulting firms in Birmingham52
  • Global consulting firms in Edinburgh51
  • Global consulting firms in Cambridge43

Frequently asked

How many global consulting firms are there based in the United Kingdom?

RevenueBase identified 4,667 global 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?

Protiviti, headquartered in Leeds, tops this list with the largest team on record.

Which city has the most global consulting firms?

London leads with 1768 headquartered companies, followed by Manchester (99) and Bristol (55).

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 13,179 verified decision-maker contacts tracked across these 4,667 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 3, 2026.

Ready to reach these companies? Verified emails and direct dials for all 4,667 global consulting firms based in the United Kingdom. Start with a free account, no credit card.

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Related lists

Browse: Companies home · All United Kingdom lists · All Global consulting firms lists · New lists

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.

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