Company lists · Data refreshed September 2026

Top 25 Accounting firm business process outsourcing companies based in the United Kingdom

Name: Accounting firm business process outsourcing companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 27, 2026 3,228 companies tracked

RevenueBase identified 3,228 company matches for accounting firm business process outsourcing companies associated with the United Kingdom as of September 2026 and tracks 40,393 professional contacts across them, including 15,537 with verified work emails and 1,459 with mobile numbers. London is the largest hub.

This list covers company matches for accounting firm business process outsourcing companies 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 27, 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 27, 2026 How this list was built

3,228Companies

40,393Contacts tracked

15,537Verified emails

1,459Mobile numbers

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The 25 largest accounting firm business process outsourcing companies based in the United Kingdom

Ranked by team size

Top 25 of 3,228 company matches for accounting firm business process outsourcing companies based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 27, 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.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	BDO UK	Exact match	London, United KingdomHQ recorded Sep 27, 2026	5,001-10,000	6,933 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 27, 2026 · View company records in RevenueBase
2	AAB	Exact match	Uk And Ireland, United KingdomHQ recorded Sep 27, 2026	1,001-5,000	1,125 contacts →
	Exact match “We provide services that help businesses at every stage of the lifecycle.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
3	PKF Littlejohn	Exact match	London, United KingdomHQ recorded Sep 27, 2026	501-1,000	702 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 27, 2026 · View company records in RevenueBase
4	Pkf-Francis Clark Chartered Accountants & Business Advisers	Exact match	Exeter, United KingdomHQ recorded Sep 27, 2026	501-1,000	700 contacts →
	Exact match “Any good accountancy firm can help with your finance, audit, and tax.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
5	Haysmac	Exact match	London, United KingdomHQ recorded Sep 27, 2026	501-1,000	655 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 27, 2026 · View company records in RevenueBase
6	Mazars In The UK	Exact match	London, United KingdomHQ recorded Sep 27, 2026	1,001-5,000	505 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
7	Outbooks	Exact match	Harrow, United KingdomHQ recorded Sep 27, 2026	201-500	477 contacts →
	Exact match “Outbooks is a leading provider of outsourcing services to accounting and bookkeeping firms.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
8	Corient Business Solutions Limited	Exact match	Coventry, United KingdomHQ recorded Sep 27, 2026	501-1,000	423 contacts →
	Exact match “Corient is a specialist outsourced accounting and bookkeeping partner, built exclusively for UK accountancy practices.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
9	Bhp, Chartered Accountants	Exact match	Sheffield, United KingdomHQ recorded Sep 27, 2026	201-500	409 contacts →
	Exact match “BHP is one of the largest firms of chartered accountants in Yorkshire, providing high-quality assurance, advisory, corporate finance and tax services.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
10	Gravita	Exact match	London, United KingdomHQ recorded Sep 27, 2026	201-500	379 contacts →
	Exact match “Welcome to the new era of accountancy.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
11	Dains Accountants & Advisers	Exact match	Birmingham, United KingdomHQ recorded Sep 27, 2026	501-1,000	374 contacts →
	Exact match “Your success matters.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
12	SKS Business Services	Exact match	London, United KingdomHQ recorded Sep 27, 2026	501-1,000	322 contacts →
	Exact match “At SKS, we pride ourselves on being different.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
13	GI Outsourcing	Exact match	London, United KingdomHQ recorded Sep 27, 2026	201-500	311 contacts →
	Exact match “GI Outsourcing is a UK-based accountants outsourcing firm.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
14	James Cowper Kreston	Exact match	Newbury, United KingdomHQ recorded Sep 27, 2026	51-200	235 contacts →
	Exact match “James Cowper Kreston is a leading firm of accountants and business advisers, with offices in Newbury, Oxford, London, Reading and Southampton.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
15	Lubbock Fine	Exact match	London, United KingdomHQ recorded Sep 27, 2026	51-200	203 contacts →
	Exact match “Lubbock Fine is an independent accounting, tax, audit and advisory firm in the City of London.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
16	Westcotts Chartered Accountants & Business Advisers	Exact match	Exeter, United KingdomHQ recorded Sep 27, 2026	201-500	196 contacts →
	Exact match “Westcotts have been offering experienced and talented partners and specialists to support a diverse range of individuals and businesses, operating in local, national and…” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
17	Monahans, Part Of The Sumer Group	Exact match	Swindon, United KingdomHQ recorded Sep 27, 2026	201-500	191 contacts →
	Exact match “For over a century, Monahans has been at the heart of local business communities in the South West and beyond.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
18	Galloways Accounting	Exact match	Brighton, United KingdomHQ recorded Sep 27, 2026	201-500	187 contacts →
	Exact match “Galloways is the fastest growing accounting services firm in Sussex.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
19	Henderson Loggie	Exact match	Dundee, United KingdomHQ recorded Sep 27, 2026	51-200	167 contacts →
	Exact match “Chartered Accountants, Tax and Business Advisors based in Aberdeen, Dundee, Edinburgh and Glasgow.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
20	Finance & Accounting For Business	Exact match	Rushden, United KingdomHQ recorded Sep 27, 2026	n/a	166 contacts →
	Exact match “For your business to succeed.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
21	Burgess Hodgson	Exact match	Canterbury, United KingdomHQ recorded Sep 27, 2026	51-200	140 contacts →
	Exact match “Burgess Hodgson are a Kent based accountancy firm with the skills and expertise to rival any other accountancy firm in the UK.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
22	HSJ Accountants, Business & TAX Advisors	Exact match	Newport, United KingdomHQ recorded Sep 27, 2026	51-200	134 contacts →
	Exact match “Award winning accountants & tax advisors based in Newport, South Wales.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
23	Accounts And Legal	Exact match	London, United KingdomHQ recorded Sep 27, 2026	11-50	133 contacts →
	Exact match “Traditional accountants do a great job of the numbers, but that's often as far as the service goes.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
24	Rickard Luckin	Exact match	Chelmsford, United KingdomHQ recorded Sep 27, 2026	51-200	127 contacts →
	Exact match “Rickard Luckin operates throughout the South East, with offices in Basildon, Chelmsford and Leigh-on-Sea.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
25	Ellacotts Accountants	Exact match	Banbury, United KingdomHQ recorded Sep 27, 2026	51-200	120 contacts →
	Exact match “Ellacotts is one of the largest independent accounting and business advisory firms in the UK and is ranked as a Top 100 Accountancy Firm by Accountancy Age.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “accounting firm business process outsourcing companies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 3,228 accounting firm business process outsourcing companies based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 15,537 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Accounting firm business process outsourcing companies based in the United Kingdom at a glance

As of Sep 27, 2026

38.5%Verified-email coverage

3.6%Mobile-number coverage

12.5Average contacts per company

1-10Median size (employees)

22.6%Largest-city concentration · London

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

2,213

11-50

773

51-200

144

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 30.0d

8,7630–30

6,26031–60

42261–90

1790–180

75180+

Company record updated

Median 92.0d

00–30

2,05331–60

16,73961–90

18,78790–180

2,814180+

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 “accounting firm business process outsourcing companies” 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 15,537 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 27, 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.

Accounting firm business process outsourcing companies by metro

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 “accounting firm business process outsourcing companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many accounting firm business process outsourcing companies are there based in the United Kingdom?

RevenueBase identified 3,228 company matches for accounting firm business process outsourcing companies 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?

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

Which city has the most accounting firm business process outsourcing companies?

London leads with 730 company records, followed by Manchester (71) and Birmingham (56).

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 15,537 professional contacts with verified work emails tracked across these 3,228 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 27, 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.