Company lists · Data refreshed September 2026

Top 25 Nonprofit accounting outsourcing firms based in the United Kingdom

RevenueBase identified 340 company matches for nonprofit accounting outsourcing firms associated with the United Kingdom as of September 2026 and tracks 2,433 professional contacts across them, including 648 with verified work emails. London is the largest hub.

This list covers company matches for nonprofit accounting outsourcing 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 29, 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 29, 2026 How this list was built
340Companies
2,433Contacts tracked
648Verified emails
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The 25 largest nonprofit accounting outsourcing firms based in the United Kingdom

Ranked by team size
Top 25 of 340 company matches for nonprofit accounting outsourcing firms based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 29, 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 matchHarrow, United KingdomHQ recorded Sep 29, 2026201-500477 contacts →

Exact match

“Outbooks is a leading provider of outsourcing services to accounting and bookkeeping firms.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
2Exact matchLondon, United KingdomHQ recorded Sep 29, 2026201-500311 contacts →

Exact match

“GI Outsourcing is a UK-based accountants outsourcing firm.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
3Exact matchLondon, United KingdomHQ recorded Sep 29, 202651-200108 contacts →

Exact match

“As attention turns to the new fiscal year, accountants across the UK are finalising plans to boost growth and productivity and improve profitability.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
4Exact matchHemel Hempstead, United KingdomHQ recorded Sep 29, 2026501-1,000102 contacts →

Exact match

“SJD is now Caroola Accountancy!”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
5Exact matchWembley, United KingdomHQ recorded Sep 29, 202651-20096 contacts →

Exact match

“Affinity Outsourcing is an accountancy outsourcing company that specialises in outsourcing for Accounting Practices.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
6Exact matchLondon, United KingdomHQ recorded Sep 29, 202651-20058 contacts →

Exact match

“We are on a mission to help accountants to grow their accountancy practice and become more profitable.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
7Exact matchLondon, United KingdomHQ recorded Sep 29, 202651-20048 contacts →

Exact match

“ACCOUNTAX.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
8Exact matchCirencester, United KingdomHQ recorded Sep 29, 20261-1030 contacts →

Exact match

“We found that there was often a breakdown in service between your bookkeeper and your accountant and that more often than not the accountant was spending a majority of their time…”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
9Exact matchWoking, United KingdomHQ recorded Sep 29, 202611-5023 contacts →

Exact match

“JS2 is a firm of Chartered Accountants providing a specialist financial services to charities and the not-for-profit sector throughout London and the South East.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
10Exact matchPoole, United KingdomHQ recorded Sep 29, 20261-1018 contacts →

Exact match

“At Ookkee we are aiming to get business owners back in touch with the numbers.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
11Exact matchLondon, United KingdomHQ recorded Sep 29, 202611-5016 contacts →

Exact match

“Excelsious provides accounting, bookkeeping and finance function outsourcing services to accountancy firms and small to medium enterprises.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
12Exact matchDarlington, United KingdomHQ recorded Sep 29, 20261-1016 contacts →

Exact match

“Accounts Agency are an expert local team with a national network.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
13Exact matchHitchin, United KingdomHQ recorded Sep 29, 20261-1014 contacts →

Exact match

“Modina is a friendly, professional outsourcing service dedicated to helping you stay in control of your bookkeeping and payroll.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
14Exact matchManchester, United KingdomHQ recorded Sep 29, 2026201-50013 contacts →

Exact match

“Our mission at Clearcut Outsourcing is to provide exceptional accountancy outsourcing services to accountancy firms of all sizes.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
15Exact matchRichmond, United KingdomHQ recorded Sep 29, 202611-5012 contacts →

Exact match

“Chartered Accountants based in Richmond we provide a wide range of services to clients both in the UK and also from abroad.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
16Exact matchLeicester, United KingdomHQ recorded Sep 29, 202611-5012 contacts →

Exact match

“MNE is an innovative firm in the accountancy industry offering a full accounts outsourcing service for some of the UK’s leading businesses and brands.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
17Exact matchSwindon, United KingdomHQ recorded Sep 29, 202611-5011 contacts →

Exact match

“Credentia has been in the Accounting, Bookkeeping & Tax Advisory Out Source Solutions business since 2008.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
18Exact matchLondon, United KingdomHQ recorded Sep 29, 202611-5010 contacts →

Exact match

“AMS Admin Services: Accounting Made Simple At AMS Admin Services, we are dedicated to making accounting and financial management effortless and efficient for a wide array of…”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
19Exact matchBristol, United KingdomHQ recorded Sep 29, 202611-5010 contacts →

Exact match

“LAWES & CO UK LIMITED is an accounting company based out of BOYCES BUILDING 40-42 REGENT STREET CLIFTON, BRISTOL, United Kingdom.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
20Exact matchMelbourne, United KingdomHQ recorded Sep 29, 202611-5010 contacts →

Exact match

“Providing charities & mission driven organisations with 360° finance and operations teams, allowing them to do what they do best, while we do what we do best.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
21Exact matchGuildford, United KingdomHQ recorded Sep 29, 20261-1010 contacts →

Exact match

“Blue Matrix Business Services provides Accounting and Bookkeeping services that are Professional, Friendly and Reliable.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
22Exact matchLancaster, United KingdomHQ recorded Sep 29, 20261-1010 contacts →

Exact match

“Accounts Matters provides a range of accounting, book keeping, payroll and other related business services.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
23Exact matchLondon, United KingdomHQ recorded Sep 29, 20261-1010 contacts →

Exact match

“AT ACCOUNTABILITY EUROPE OUR FOCUS IS ON FLEXIBLE, COST EFFECTIVE SOLUTIONS TO YOUR ORGANISATION'S FINANCIAL MANAGEMENT NEEDS.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
24Exact matchSutton, United KingdomHQ recorded Sep 29, 20261-1010 contacts →

Exact match

“Charity Accounting Services was founded with the mission to make life easier for charities.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
25Exact matchPitsford, United KingdomHQ recorded Sep 29, 202611-509 contacts →

Exact match

“We aren’t your standard accountants, if you need something, we’re just at the end of the phone.”

Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase

Showing 25 of 340 nonprofit accounting outsourcing firms based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 648 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Nonprofit accounting outsourcing firms based in the United Kingdom at a glance

As of Sep 29, 2026
26.6%Verified-email coverage
7.2Average contacts per company
1-10Median size (employees)
26.8%Largest-city concentration · London
Sep 29, 2026Page data refreshed

Companies by employee count

1-10
261
11-50
52
51-200
15
201-500
5
501-1,000
1
1,001-5,000
2

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 340 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 “nonprofit accounting outsourcing 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 648 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 29, 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.

Nonprofit accounting outsourcing firms 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 “nonprofit accounting outsourcing firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many nonprofit accounting outsourcing firms are there based in the United Kingdom?

RevenueBase identified 340 company matches for nonprofit accounting outsourcing 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?

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

Which city has the most nonprofit accounting outsourcing firms?

London leads with 91 company records, followed by Bristol (7) and Manchester (6).

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 648 professional contacts with verified work emails tracked across these 340 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 29, 2026.

Ready to reach these companies? Verified emails and direct dials for all 340 nonprofit accounting outsourcing firms based in the United Kingdom. Start with a free account, no credit card.

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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.