Company lists · Data refreshed September 2026

Top 25 Professional services firms based in the United Kingdom

Name: Professional services 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 5,677 companies tracked

RevenueBase identified 5,677 professional services firms headquartered in the United Kingdom as of September 2026 and tracks 90,882 professional contacts across them, including 34,096 with verified work emails and 3,713 with mobile numbers. London is the largest hub.

This list covers professional services 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

5,677Companies

90,882Contacts tracked

34,096Verified emails

3,713Mobile numbers

Unlock all 5,677 companies Free signup · no credit card · 500 free credits

The 25 largest professional services firms based in the United Kingdom

Ranked by team size

Top 25 of 5,677 professional services 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 professional services 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	Kpmg UKIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	10001+	14,509
	“Make growth happen.” Source: company website · checked Sep 5, 2026
2	BDO UKIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	5,001-10,000	6,933
	“BDO LLP is an accountancy and business advisory firm that provides Audit, Tax, Deals, and Consulting, Risk & Outsourcing (CR & O) services to entrepreneurial, growing and…” Source: company website · checked Sep 5, 2026
3	Moore GlobalIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	5,001-10,000	2,047
	“At Moore, our purpose is to help people thrive – our clients, our people and the communities they live and work in.” Source: company website · checked Sep 5, 2026
4	TAX ConsultantIndirect evidence	Brighton, United KingdomHQ checked Sep 5, 2026	n/a	2,042
	“A traditional general practice, with a twist.” Source: company website · checked Sep 5, 2026
5	S&wIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	1,001-5,000	1,930
	“As a fast growing UK accounting and advisory firm, we’ve been there, as a trusted partner, helping businesses and individuals meet challenges and seize opportunities across…” Source: company website · checked Sep 5, 2026
6	TLT LLPIndirect evidence	Bristol, United KingdomHQ checked Sep 5, 2026	1,001-5,000	1,797
	“We’re your business advisers as well as your lawyers, working in step with you to protect your interests today and progress your ambitions for tomorrow.” Source: company website · checked Sep 5, 2026
7	Crowe UKIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	1,001-5,000	1,395
	“Crowe UK is a leading audit, tax, advisory and consulting firm with a national presence to complement our international reach.” Source: company website · checked Sep 5, 2026
8	Moore Kingston SmithIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	501-1,000	1,151
	“At Moore Kingston Smith, we believe in the potential of people to make a positive impact, fuelled by the power of genuine understanding.” Source: company website · checked Sep 5, 2026
9	AABIndirect evidence	Uk And Ireland, United KingdomHQ checked Sep 5, 2026	1,001-5,000	1,125
	“We provide services that help businesses at every stage of the lifecycle.” Source: company website · checked Sep 5, 2026
10	TC GroupIndirect evidence	Steyning, United KingdomHQ checked Sep 5, 2026	1,001-5,000	901
	“TC Group \| 0330 088 \| At TC Group, everything we do is anchored in our purpose: shaping stronger businesses and building secure and meaningful futures.” Source: company website · checked Sep 5, 2026
11	PKF LittlejohnIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	501-1,000	702
	“We are a fast-growing firm of accountants and business advisers based in London’s Canary Wharf, Leeds and in Manchester.” Source: company website · checked Sep 5, 2026
12	Blick RothenbergIndirect evidence	Covent Garden, United KingdomHQ checked Sep 5, 2026	501-1,000	701
	“Blick Rothenberg is a leading tax, accounting and business advisory firm founded on personal integrity and technical expertise.” Source: company website · checked Sep 5, 2026
13	Pkf-Francis Clark Chartered Accountants & Business AdvisersIndirect evidence	Exeter, United KingdomHQ checked Sep 5, 2026	501-1,000	700
	“Any good accountancy firm can help with your finance, audit, and tax.” Source: company website · checked Sep 5, 2026
14	HaysmacIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	501-1,000	655
	“HaysMac is an award‑winning accountancy, tax and advisory firm, known for delivering expert, partner‑led advice to ambitious organisations and individuals.” Source: company website · checked Sep 5, 2026
15	Kreston ReevesIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	501-1,000	602
	“We guide our clients, colleagues and communities to a brighter future.” Source: company website · checked Sep 5, 2026
16	Armstrong WatsonIndirect evidence	Carlisle, United KingdomHQ checked Sep 5, 2026	501-1,000	579
	“Armstrong Watson has been advising and protecting clients across the North of England and Scotland since 1867.” Source: company website · checked Sep 5, 2026
17	BuzzacottIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	501-1,000	575
	“Buzzacott is an accountancy and advisory firm with a long-standing history of supporting individuals, businesses, and not-for-profits.” Source: company website · checked Sep 5, 2026
18	Mazars In The UKIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	1,001-5,000	505
	Source: company website · checked Sep 5, 2026
19	Price BaileyIndirect evidence	Bishop's Stortford, United KingdomHQ checked Sep 5, 2026	201-500	500
	“Price Bailey is a leading firm of chartered accountants and business advisers with offices across East Anglia, London, and a strategic presence overseas, serving local SMEs…” Source: company website · checked Sep 5, 2026
20	ProgenyStrong evidence	Leeds, United KingdomHQ checked Sep 5, 2026	201-500	415
	“Progeny is the first and only global professional services firm to bring together independent advisory excellence across financial planning, tax, legal and asset management.” Source: company website · checked Sep 5, 2026
21	Talbots LAWIndirect evidence	Stourbridge, United KingdomHQ checked Sep 5, 2026	501-1,000	413
	“Talbots Law can offer your business a wide range of legal services - no matter what business you are in.” Source: company website · checked Sep 5, 2026
22	GravitaIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	379
	“Welcome to the new era of accountancy.” Source: company website · checked Sep 5, 2026
23	Duncan & ToplisIndirect evidence	Grantham, United KingdomHQ checked Sep 5, 2026	501-1,000	378
	“Duncan & Toplis is one of the largest accounting and business advisers in the UK.” Source: company website · checked Sep 5, 2026
24	AffiniaIndirect evidence	Colchester, United KingdomHQ checked Sep 5, 2026	1,001-5,000	375
	“Accountants, Tax and Business Advisers.” Source: company website · checked Sep 5, 2026
25	Dains Accountants & AdvisersIndirect evidence	Birmingham, United KingdomHQ checked Sep 5, 2026	501-1,000	374
	“Your success matters.” Source: company website · checked Sep 5, 2026

Showing 25 of 5,677 professional services firms based in the United Kingdom

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Professional services firms based in the United Kingdom at a glance

As of Sep 5, 2026

1-10Median size (employees)

LondonLargest hub · 1271 HQs

3,713Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

3,892

11-50

1,346

51-200

253

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Verified emails by last verification

0–30

31,663

31–60

2,208

61–90

90–180

180+

176

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 professional services 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 “professional services 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 professional services 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, 34,096 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.

Professional services firms by metro

Frequently asked

How many professional services firms are there based in the United Kingdom?

RevenueBase identified 5,677 professional services 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?

Kpmg UK, headquartered in London, tops this list with the largest team on record.

Which city has the most professional services firms?

London leads with 1271 headquartered companies, followed by Manchester (101) and Birmingham (94).

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 34,096 verified decision-maker contacts tracked across these 5,677 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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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.