Company lists · Data refreshed September 2026

Top 25 Organizational development consulting firms based in the United Kingdom

Name: Organizational development 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 5, 2026 10,972 companies tracked

RevenueBase identified 10,972 organizational development consulting firms headquartered in the United Kingdom as of September 2026 and tracks 66,701 professional contacts across them, including 23,205 with verified work emails and 5,900 with mobile numbers. London is the largest hub.

This list covers organizational development 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 5, 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 HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review

10,972Companies

66,701Contacts tracked

23,205Verified emails

5,900Mobile numbers

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The 25 largest organizational development consulting firms based in the United Kingdom

Ranked by team size

Top 25 of 10,972 organizational development consulting firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names organizational development 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.
#	Company	Headquarters	Employees	Contacts
1	BaringaPartial evidence	London, United KingdomHQ checked Sep 5, 2026	1,001-5,000	2,179
	“Baringa is a global consulting firm that helps leaders drive meaningful change and create value.” Source: company website · checked Sep 5, 2026
2	Oc&c Strategy ConsultantsIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	501-1,000	1,011
	“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: company website · checked Sep 5, 2026
3	InsightsPartial evidence	Dundee, United KingdomHQ checked Sep 5, 2026	501-1,000	897
	“We're a people development company, built to create a world where people truly understand themselves and others, and are inspired to make a positive difference in everything they…” Source: company website · checked Sep 5, 2026
4	Pegasus GroupPartial evidence	Lichfield, United KingdomHQ checked Sep 5, 2026	201-500	580
	“Since 2003, we’ve been solving planning and development problems for our clients successfully.” Source: company website · checked Sep 5, 2026
5	MindgymIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	450
	“We’re MindGym.” Source: company website · checked Sep 5, 2026
6	Scott LogicIndirect evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 5, 2026	201-500	383
	“At Scott Logic, we design and build software that transforms the performance of some of the world’s biggest and most demanding organisations.” Source: company website · checked Sep 5, 2026
7	Gcps ConsultingPartial evidence	Sheffield, United KingdomHQ checked Sep 5, 2026	n/a	377
	“GCPS is a UK-based international consulting firm with a network of highly experienced consultants supporting clients to prevent and respond to staff misconduct (e.g.” Source: company website · checked Sep 5, 2026
8	GrayceIndirect evidence	Manchester, United KingdomHQ checked Sep 5, 2026	501-1,000	376
	“Grayce partners with some of the world’s most ambitious organisations to help deliver change and transformation.” Source: company website · checked Sep 5, 2026
9	EmergnIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	501-1,000	351
	“Emergn is a global technology and management consultancy built on a simple conviction: the only sustainable competitive advantage is the way you work.” Source: company website · checked Sep 5, 2026
10	Q5Indirect evidence	London, United KingdomHQ checked Sep 5, 2026	501-1,000	344
	“Q5 is a global, award-winning management consultancy focused on building healthy, high-performing organisations.” Source: company website · checked Sep 5, 2026
11	Mercer UKIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	10001+	329
	“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: company website · checked Sep 5, 2026
12	PGCIndirect evidence	Uk, United KingdomHQ checked Sep 5, 2026	n/a	320
	“In 2018 PGC rebranded as Friisberg & Partners International +44 207 062 3603” Source: company website · checked Sep 5, 2026
13	ParetoIndirect evidence	Wilmslow, United KingdomHQ checked Sep 5, 2026	201-500	297
	“Pareto partner globally with organisations to take people from learning to leading.” Source: company website · checked Sep 5, 2026
14	ElixirrPartial evidence	London, United KingdomHQ checked Sep 5, 2026	501-1,000	275
	“An award-winning global consulting firm working with clients across a diverse range of markets, industries and geographies.” Source: company website · checked Sep 5, 2026
15	Elevate TalentPartial evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	250
	“Elevate Talent supports ambitious companies in optimizing organizational performance and sourcing exceptional leaders from across sports, entertainment, media, lifestyle…” Source: company website · checked Sep 5, 2026
16	Moorhouse B Corp CertifiedPartial evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	247
	“We’re a dynamic consulting firm, focused on delivering change.” Source: company website · checked Sep 5, 2026
17	Sheffield HaworthIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	244
	“Sheffield Haworth is a global consultancy founded in 1993.” Source: company website · checked Sep 5, 2026
18	Albany BeckPartial evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	240
	“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 5, 2026
19	YSC Consulting, Part Of AccenturePartial evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	227
	“YSC Consulting, now part of Accenture, is a leadership strategy consultancy.” Source: company website · checked Sep 5, 2026
20	Protiviti UKIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	206
	“Welcome to the Protiviti perspective.” Source: company website · checked Sep 5, 2026
21	GatenbysandersonIndirect evidence	Leeds, United KingdomHQ checked Sep 5, 2026	51-200	202
	“GatenbySanderson is the UK's leading people intelligence advisory business.” Source: company website · checked Sep 5, 2026
22	OIMIndirect evidence	Bath, United KingdomHQ checked Sep 5, 2026	n/a	198
	“OIM is dedicated to building competitive organisations.” Source: company website · checked Sep 5, 2026
23	TSK GroupIndirect evidence	London And Manchester, United KingdomHQ checked Sep 5, 2026	51-200	192
	“We are workplace transformation partners, achieving extraordinary outcomes for people, place and planet.” Source: company website · checked Sep 5, 2026
24	ClarifyIndirect evidence	Theale, United KingdomHQ checked Sep 5, 2026	51-200	191
	“Clarify helps global Technology companies achieve sustained and significant commercial success.” Source: company website · checked Sep 5, 2026
25	Green ParkIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	187
	“Green Park is a specialist executive search and advisory firm trusted by organisations seeking stronger, more future-ready leadership.” Source: company website · checked Sep 5, 2026

Showing 25 of 10,972 organizational development consulting firms based in the United Kingdom

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Organizational development consulting firms based in the United Kingdom at a glance

As of Sep 5, 2026

1-10Median size (employees)

LondonLargest hub · 3969 HQs

5,900Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

9,297

11-50

1,303

51-200

231

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Verified emails by last verification

0–30

21,615

31–60

1,395

61–90

90–180

180+

182

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 organizational development 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 “organizational development 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 organizational development 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, 23,205 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 5, 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.

Organizational development consulting firms by metro

Frequently asked

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

RevenueBase identified 10,972 organizational development 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 organizational development consulting firms?

London leads with 3969 headquartered companies, followed by Manchester (234) and Bristol (168).

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 23,205 verified decision-maker contacts tracked across these 10,972 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 5, 2026.

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Organizational development consulting firms by geography

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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 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.