Company lists · Data verified August 2026

Top 25 Consulting firms based in the United Kingdom

Name: Consulting firms based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 16,262 companies tracked

There are 16,262 consulting firms headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 124,527 professional contacts across them, including 40,018 with verified work emails and 13,633 with mobile numbers. London is the largest hub.

This list covers 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. Data current as of August 28, 2026.

16,262Companies

124,527Contacts tracked

40,018Verified emails

13,633Mobile numbers

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The 25 largest consulting firms based in the United Kingdom

Ranked by team size

Top 25 of 16,262 consulting firms based in the United Kingdom, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Gspann Technologies, INC	London	1,001-5,000	1,874	754
2	Exponent	London	1,001-5,000	1,561	980
3	DDI Development Dimensions International	London	1,001-5,000	1,549	467
4	Barnett Waddingham	Guildford	1,001-5,000	1,352	894
5	First Derivative	Newry	1,001-5,000	1,022	525
6	Visagio	Reading	501-1,000	976	439
7	PKF Littlejohn	London	501-1,000	710	419
8	BIP Brasil	Londres	1,001-5,000	615	4
9	Mazars In The UK	London	1,001-5,000	516	231
10	Leader Investment Group - LIG	London	501-1,000	452	42
11	ERA Group - Emea	Kings Hill West Malling	501-1,000	444	300
12	Q5	Leeds	501-1,000	340	233
13	Mercer UK	London	10001+	334	155
14	H&z Management Consulting	London	501-1,000	287	153
15	Seargin	London	501-1,000	275	188
16	Elixirr	London	501-1,000	271	193
17	Ethos Farm	New York	1,001-5,000	264	81
18	V R Della Infotech Inc- V R Della Group	London	501-1,000	253	46
19	The Erith Group	London	501-1,000	215	127
20	EIDRA	London	1,001-5,000	182	108
21	K3 Capital Group	Manchester	501-1,000	96	56
22	Baker Tilly Business Services Limited	Marlow Bucks	1,001-5,000	92	2
23	Driver Trett	London	501-1,000	80	29
24	Milliman UK	London	1,001-5,000	57	40
25	Odgers Berndtson	London	1,001-5,000	55	45

Showing 25 of 16,262 consulting firms based in the United Kingdom

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Consulting firms based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 6692 HQs

13,633Contacts with mobile numbers

349Emails re-verified in last 30 days

Companies by employee count

1-10

12,805

11-50

2,454

51-200

531

201-500

103

501-1,000

1,001-5,000

10001+

Consulting firms by metro

Metro	Companies
Consulting firms in London	6692
Consulting firms in Manchester	362
Consulting firms in Birmingham	213
Consulting firms in Leeds	186
Consulting firms in Edinburgh	180
Consulting firms in Bristol	180
Consulting firms in Glasgow	156

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “consulting firms”, with match quality audited by blind human judging, and headquartered in the United Kingdom.
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: Contact records re-verify on a rolling cadence; 349 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

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

There are 16,262 consulting firms headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Gspann Technologies, INC, headquartered in London, tops this list with the largest team on record.

Which city has the most consulting firms?

London leads with 6692 headquartered companies, followed by Manchester (362) and Birmingham (213).

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 40,018 verified decision-maker contacts tracked across these 16,262 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.