Company lists · Data refreshed August 2026

Top 25 Accounting services outsourcing companies based in the United Kingdom

RevenueBase identified 2,727 company matches for accounting services outsourcing companies associated with the United Kingdom as of August 2026 and tracks 16,272 professional contacts across them, including 3,427 with verified work emails and 666 with mobile numbers. London is the largest hub.

This list covers company matches for accounting services 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 August 30, 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 Aug 30, 2026 How this list was built
2,727Companies
16,272Contacts tracked
3,427Verified emails
666Mobile numbers
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The 25 largest accounting services outsourcing companies based in the United Kingdom

Ranked by team size
Top 25 of 2,727 company matches for accounting services outsourcing companies based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Aug 30, 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 Kingdom201-500475 contacts →

Exact match

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

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
2Exact matchCroydon, United Kingdom501-1,000360 contacts →

Exact match

“Cohesive is a leading solutions provider and systems integrator for IBM Maximo.”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
3Exact matchLondon, United Kingdom501-1,000321 contacts →

Exact match

“At SKS, we pride ourselves on being different.”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
4Exact matchLondon, United Kingdom201-500317 contacts →

Exact match

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

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
5Exact matchLondon, United Kingdom201-500132 contacts →

Exact match

“At Obox Solution Ltd, we support accounting firms and mid-market businesses by providing tailored virtual staffing solutions for bookkeeping, payroll, CFO services, tax, financial…”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
6Exact matchLondon, United Kingdom51-200108 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 · Aug 30, 2026 · View company records in RevenueBase
7Exact matchLondon, United Kingdom51-200103 contacts →

Exact match

“Online Accounting Service | Bookkeeping | Payroll | Personal Tax Return Filing to HMRC | Corporation Tax Filing | HMRC ONLINE FILING: Our aim is to help small business owners` tax…”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
8Exact matchHemel Hempstead, United Kingdom501-1,000102 contacts →

Exact match

“SJD is now Caroola Accountancy!”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
9Exact matchLondon Croydon, United Kingdom501-1,000100 contacts →

Exact match

“Paperchase Business Services Ltd (PBSL) is a firm of accountants, taxation and business advisors based in South London.”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
10Exact matchSt Albans, United Kingdom51-20097 contacts →

Exact match

“At Rayner Essex, we believe your accountant should do a lot more than just report on how your business is doing - he or she should help you identify opportunities to improve your…”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
11Exact matchLondon, United Kingdom51-20096 contacts →

Exact match

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

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
12Exact matchManchester, United Kingdom51-20090 contacts →

Exact match

“More Than Accountants is an industry leader when it comes to cutting edge accountancy services and business growth, we utilise the latest technology to help us achieve both our…”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
13Exact matchLondon, United Kingdom51-20088 contacts →

Exact match

“Sapphire is an accounting outsourcing company set up for accounting firms in UK and is based in India.”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
14Exact matchLondon, United Kingdom51-20075 contacts →

Exact match

“Base Practice Support Ltd is the UK's fastest-growing Accountancy Practice Support company.”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
15Exact matchCambridge, United Kingdom51-20068 contacts →

Exact match

“Isosceles Finance Helping ambitious businesses grow Isosceles is a business services company supporting rapidly growing and investor-backed companies with fractional CFO services…”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
16Exact matchWembley, United Kingdom201-50064 contacts →

Exact match

“Affinity Associates Limited is a leading accounting firm based in Wembley, London, UK, and is regulated and authorised for public practice by both the ICAEW (Institute of…”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
17Exact matchWirral, United Kingdom51-20063 contacts →

Exact match

“We offer online accounting services which simplify tax and finances for small businesses, by providing a fresh alternative to old-school high street accountants.”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
18Exact matchLondon, United Kingdom51-20057 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 · Aug 30, 2026 · View company records in RevenueBase
19Exact matchUnited Kingdom51-20054 contacts →

Exact match

“Acenteus Accounting, legally known as Acenteus CCA Global Ltd is a UK-registered outsourced accounting and finance partner delivering secure, cloud-enabled support for…”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
20Exact matchLondon, United Kingdom51-20053 contacts →

Exact match

“Est.”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
21Exact matchCambridge, United Kingdom51-20044 contacts →

Exact match

“We offer a CFO-led virtual finance team.”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
22Exact matchRugby, United Kingdom51-20043 contacts →

Exact match

“AccountsBytes believes in INTACT a.”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
23Exact matchStevenage, United Kingdom51-20040 contacts →

Exact match

“Moore Northern Home Counties offers a wide range of accountancy, tax and advisory services.”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
24Exact matchLondon, United Kingdom201-50039 contacts →

Exact match

“Accounting.”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase
25Exact matchLondon, United Kingdom51-20034 contacts →

Exact match

“Accounting for Startups.”

Recorded in the RevenueBase company graph · Aug 30, 2026 · View company records in RevenueBase

Showing 25 of 2,727 accounting services outsourcing companies based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 3,427 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Accounting services outsourcing companies based in the United Kingdom at a glance

As of Aug 30, 2026
21.1%Verified-email coverage
4.1%Mobile-number coverage
6.0Average contacts per company
1-10Median size (employees)
19.9%Largest-city concentration · London
Aug 30, 2026Page data refreshed

Companies by employee count

1-10
2,081
11-50
433
51-200
58
201-500
18
501-1,000
7
1,001-5,000
5

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 services 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 3,427 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 August 30, 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 “accounting services outsourcing companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many accounting services outsourcing companies are there based in the United Kingdom?

RevenueBase identified 2,727 company matches for accounting services outsourcing companies associated with the United Kingdom as of August 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 accounting services outsourcing companies?

London leads with 543 company records, followed by Manchester (60) and Bristol (38).

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 3,427 professional contacts with verified work emails tracked across these 2,727 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 August 30, 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.