Company lists · Data refreshed September 2026

Top 25 Boutique consulting firms based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 23, 2026 7,818 companies tracked

RevenueBase identified 7,818 boutique consulting firms headquartered in the United Kingdom as of September 2026 and tracks 68,910 professional contacts across them, including 26,714 with verified work emails and 6,517 with mobile numbers. London is the largest hub.

This list covers boutique 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 23, 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 23, 2026 86% judged on-target in blind review

7,818Companies

68,910Contacts tracked

26,714Verified emails

6,517Mobile numbers

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The 25 largest boutique consulting firms based in the United Kingdom

Ranked by team size

Top 25 of 7,818 boutique consulting firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 23, 2026. RevenueBase Smart Search rates how each company's information relates to boutique consulting firms: 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	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	10001+	17,070 contacts →
	Indirect 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 23, 2026
2	MACE	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	5,001-10,000	8,458 contacts →
	Indirect evidence “Mace Consult launched as a new and independent business on 5 March 2026, through a carve-out from Mace Group.” Source: RevenueBase Database · checked Sep 23, 2026
3	Baringa	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	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 23, 2026
4	Oc&c Strategy Consultants	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	501-1,000	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 23, 2026
5	Strategy Insights	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	528 contacts →
	Indirect evidence “Strategy Insights is a specialist business and economic development consultancy.” Source: RevenueBase Database · checked Sep 23, 2026
6	Q5	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	501-1,000	344 contacts →
	Indirect evidence “Q5 is a global, award-winning management consultancy focused on building healthy, high-performing organisations.” Source: RevenueBase Database · checked Sep 23, 2026
7	Mercer UK	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	10001+	329 contacts →
	Indirect evidence “At Mercer, A Marsh business, we’re helping our clients realize their investment objectives, shape the future of work, and enhance health and retirement outcomes for their people.” Source: RevenueBase Database · checked Sep 23, 2026
8	Quantuma	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	201-500	277 contacts →
	Indirect evidence “Quantuma is a leading business advisory firm which works with businesses at the key milestones.” Source: RevenueBase Database · checked Sep 23, 2026
9	Elixirr	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	501-1,000	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 23, 2026
10	Moorhouse B Corp Certified	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	201-500	247 contacts →
	Partial evidence “We’re a dynamic consulting firm, focused on delivering change.” Source: RevenueBase Database · checked Sep 23, 2026
11	Albany Beck	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	201-500	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 23, 2026
12	OIM	Indirect evidence	Bath, United KingdomHQ checked Sep 23, 2026	n/a	198 contacts →
	Indirect evidence “OIM is dedicated to building competitive organisations.” Source: RevenueBase Database · checked Sep 23, 2026
13	True North Partners	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	185 contacts →
	Partial evidence “True North Partners LLP is an independent consulting firm based in London, Johannesburg, Frankfurt, Amsterdam and Madrid.” Source: RevenueBase Database · checked Sep 23, 2026
14	TXM Consult	Indirect evidence	Milton Keynes, United KingdomHQ checked Sep 23, 2026	51-200	166 contacts →
	Indirect evidence “In an uncertain, complex, and ambiguous world, business change is essential and inevitable.” Source: RevenueBase Database · checked Sep 23, 2026
15	The Berkeley Partnership	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	152 contacts →
	Indirect evidence “Founded in 1990, The Berkeley Partnership is an independent management consultancy, specialising in business transformation.” Source: RevenueBase Database · checked Sep 23, 2026
16	Opus Business Advisory Group	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	144 contacts →
	Indirect evidence “Opus Business Advisory Group is an independent advisory firm that assists clients to achieve their objectives, enhance value and attain the best possible results.” Source: RevenueBase Database · checked Sep 23, 2026
17	Sysdoc	Indirect evidence	London (uk), United KingdomHQ checked Sep 23, 2026	51-200	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 23, 2026
18	ORG	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	139 contacts →
	Indirect evidence “We believe that change is an opportunity to thrive.” Source: RevenueBase Database · checked Sep 23, 2026
19	Veran Performance	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	134 contacts →
	Indirect evidence “Winners of the UKOUG Business Transformation Advisory Partner of the Year Award 2025 Veran Performance is an advisory consultancy specialising in HR, Payroll, Procurement and…” Source: RevenueBase Database · checked Sep 23, 2026
20	Liqueo	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	123 contacts →
	Indirect evidence “Specialists in change and transformation across asset, wealth and insurance.” Source: RevenueBase Database · checked Sep 23, 2026
21	Athens	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	11-50	122 contacts →
	Indirect evidence “Athens helps clients make superior investment decisions and supports them to deliver value from these decisions through timely implementation.” Source: RevenueBase Database · checked Sep 23, 2026
22	Oaklin	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	115 contacts →
	Indirect evidence “Oaklin is an independent management consultancy.” Source: RevenueBase Database · checked Sep 23, 2026
23	Redrock Consulting	Indirect evidence	Bristol, United KingdomHQ checked Sep 23, 2026	51-200	115 contacts →
	Indirect evidence “We are RedRock, a trusted delivery partner for digital, data and technology transformation.” Source: RevenueBase Database · checked Sep 23, 2026
24	The JPP Group	Indirect evidence	Northampton, United KingdomHQ checked Sep 23, 2026	51-200	99 contacts →
	Indirect evidence “Established in 1973, JPP has steadily grown to become a consultancy that offers a broad range of services to a diverse client base.” Source: RevenueBase Database · checked Sep 23, 2026
25	Fenchurch Advisory Partners	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	98 contacts →
	Indirect evidence “Fenchurch Advisory Partners is one of the leading independent corporate finance advisory firms in London.” Source: RevenueBase Database · checked Sep 23, 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: boutique 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 boutique consulting firms.
Partial evidence: Its own public description names part of boutique consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name boutique 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 7,818 boutique consulting firms based in the United Kingdom

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Boutique consulting firms based in the United Kingdom at a glance

As of Sep 23, 2026

38.8%Verified-email coverage

9.5%Mobile-number coverage

8.8Average contacts per company

1-10Median size (employees)

38.9%Largest-city concentration · London

Sep 23, 2026Page data refreshed

Companies by employee count

1-10

6,491

11-50

1,005

51-200

207

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 25.0d

15,6220–30

4,92431–60

32661–90

3590–180

137180+

Company record updated

Median 74.0d

00–30

14,00531–60

27,79861–90

14,30890–180

2,984180+

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 boutique 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 “boutique 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 boutique 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 boutique 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, 26,714 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 23, 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.

Boutique consulting firms by metro

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 boutique 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 boutique consulting firms are there based in the United Kingdom?

RevenueBase identified 7,818 boutique 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?

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

Which city has the most boutique consulting firms?

London leads with 3042 headquartered companies, followed by Manchester (170) and Birmingham (91).

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 26,714 verified decision-maker contacts tracked across these 7,818 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 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 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.