Company lists · Data refreshed September 2026

Top 25 Large accountancy firms based in the United Kingdom

RevenueBase identified 5,197 company matches for large accountancy firms associated with the United Kingdom as of September 2026 and tracks 483,384 professional contacts across them, including 176,327 with verified work emails. London is the largest hub.

This list covers company matches for large accountancy firms associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 21, 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 RevenueBase SmartSearch · Exact Recorded Sep 21, 2026 How this list was built
5,197Companies
483,384Contacts tracked
176,327Verified emails
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The 25 largest large accountancy firms based in the United Kingdom

Ranked by team size
Top 25 of 5,197 company matches for large accountancy firms based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 21, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchLondon, United KingdomHQ recorded Sep 21, 202610001+375,085 contacts →

Exact match

“EY is building a better working world by creating new value for clients, people, society, the planet, while building trust in the capital markets.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
2Exact matchLondon, United KingdomHQ recorded Sep 21, 202610001+14,509 contacts →

Exact match

“Make growth happen.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
3Exact matchLondon, United KingdomHQ recorded Sep 21, 202610001+11,078 contacts →

Exact match

Recorded description not available.

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
4Exact matchLondon, United KingdomHQ recorded Sep 21, 20265,001-10,0006,933 contacts →

Exact match

“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…”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
5Exact matchLondon, United KingdomHQ recorded Sep 21, 20265,001-10,0005,509 contacts →

Exact match

“When choosing an advisor, you could accept the usual compromises.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
6Exact matchLondon, United KingdomHQ recorded Sep 21, 202610001+3,630 contacts →

Exact match

“RSM is a leading global network of assurance, tax and consulting firms focused on the middle-market.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
7Exact matchLondon, United KingdomHQ recorded Sep 21, 20265,001-10,0002,047 contacts →

Exact match

“At Moore, our purpose is to help people thrive – our clients, our people and the communities they live and work in.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
8Exact matchLondon, United KingdomHQ recorded Sep 21, 20261,001-5,0001,930 contacts →

Exact match

“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…”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
9Exact matchLondon, United KingdomHQ recorded Sep 21, 20261,001-5,0001,395 contacts →

Exact match

“Crowe UK is a leading audit, tax, advisory and consulting firm with a national presence to complement our international reach.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
10Exact matchLondon, United KingdomHQ recorded Sep 21, 20261,001-5,0001,230 contacts →

Exact match

“A partner-led and people-focused top 20 accountancy firm.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
11Exact matchLondon, United KingdomHQ recorded Sep 21, 2026501-1,0001,151 contacts →

Exact match

“At Moore Kingston Smith, we believe in the potential of people to make a positive impact, fuelled by the power of genuine understanding.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
12Exact matchUk And Ireland, United KingdomHQ recorded Sep 21, 20261,001-5,0001,125 contacts →

Exact match

“We provide services that help businesses at every stage of the lifecycle.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
13Exact matchLondon, United KingdomHQ recorded Sep 21, 20261,001-5,0001,001 contacts →

Exact match

“We are a leading provider of accountancy services and business advice for small and medium-sized enterprises and individuals across the UK and Ireland.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
14Exact matchNorwich, United KingdomHQ recorded Sep 21, 2026201-500708 contacts →

Exact match

“At TaxAssist Accountants we specialise in providing accountancy services, tax returns, payroll, bookkeeping, tax savings and tax advice to small businesses and support over…”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
15Exact matchLondon, United KingdomHQ recorded Sep 21, 2026501-1,000702 contacts →

Exact match

“We are a fast-growing firm of accountants and business advisers based in London’s Canary Wharf, Leeds and in Manchester.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
16Exact matchCovent Garden, United KingdomHQ recorded Sep 21, 2026501-1,000701 contacts →

Exact match

“Blick Rothenberg is a leading tax, accounting and business advisory firm founded on personal integrity and technical expertise.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
17Exact matchExeter, United KingdomHQ recorded Sep 21, 2026501-1,000700 contacts →

Exact match

“Any good accountancy firm can help with your finance, audit, and tax.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
18Exact matchLondon, United KingdomHQ recorded Sep 21, 202610001+685 contacts →

Exact match

“Nexia is a leading worldwide network of independent accounting and consulting firms.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
19Exact matchLondon, United KingdomHQ recorded Sep 21, 2026501-1,000655 contacts →

Exact match

“HaysMac is an award‑winning accountancy, tax and advisory firm, known for delivering expert, partner‑led advice to ambitious organisations and individuals.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
20Exact matchLondon, United KingdomHQ recorded Sep 21, 2026501-1,000602 contacts →

Exact match

“We guide our clients, colleagues and communities to a brighter future.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
21Exact matchCarlisle, United KingdomHQ recorded Sep 21, 2026501-1,000579 contacts →

Exact match

“Armstrong Watson has been advising and protecting clients across the North of England and Scotland since 1867.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
22Exact matchLondon, United KingdomHQ recorded Sep 21, 2026501-1,000577 contacts →

Exact match

“The UHY Hacker Young Group is an award winning Group of UK chartered accountants with offices spanning England, Wales and Northern Ireland.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
23Exact matchLondon, United KingdomHQ recorded Sep 21, 2026501-1,000575 contacts →

Exact match

“Buzzacott is an accountancy and advisory firm with a long-standing history of supporting individuals, businesses, and not-for-profits.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
24Exact matchBristol, United KingdomHQ recorded Sep 21, 2026201-500537 contacts →

Exact match

“Bishop Fleming is a Top 40 accounting firm in the UK and an award-winning tax practice.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
25Exact matchLondon, United KingdomHQ recorded Sep 21, 202610001+512 contacts →

Exact match

“Kreston is a global network of innovative, like-minded accounting firms that puts trusted relationships and exceptional care at the heart of everything it does.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase

Showing 25 of 5,197 large accountancy firms based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 176,327 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Large accountancy firms based in the United Kingdom at a glance

As of Sep 21, 2026
36.5%Verified-email coverage
93.0Average contacts per company
1-10Median size (employees)
18.0%Largest-city concentration · London
Sep 21, 2026Page data refreshed

Companies by employee count

1-10
3,252
11-50
1,526
51-200
254
201-500
50
501-1,000
22
1,001-5,000
20
5,001-10,000
9
10001+
12

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 5,197 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

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
Company records associated with the United Kingdom whose business descriptions match “large accountancy firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch
Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview
The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality
RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 176,327 professional contacts with verified work emails across the full matched dataset. 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 21, 2026. Lists refresh periodically as the graph is re-checked.
Record context
Company records and descriptions can change. Check the company's website for its current services and locations.

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “large accountancy firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many large accountancy firms are there based in the United Kingdom?

RevenueBase identified 5,197 company matches for large accountancy firms associated with the United Kingdom as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

EY tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most large accountancy firms?

London leads with 934 company records, followed by Birmingham (105) and Manchester (105).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 176,327 professional contacts with verified work emails tracked across these 5,197 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 21, 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.