Company lists · Data refreshed September 2026
Top 25 Finance and accounting outsourcing companies based in the United Kingdom
RevenueBase identified 1,122 finance and accounting outsourcing companies headquartered in the United Kingdom as of September 2026 and tracks 5,496 professional contacts across them, including 1,521 with verified work emails and 235 with mobile numbers. London is the largest hub.
This list covers finance and accounting outsourcing companies 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 2, 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.
The 25 largest finance and accounting outsourcing companies based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 475 | ||||
“Outbooks is a leading provider of outsourcing services to accounting and bookkeeping firms.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 2 | SKS Business ServicesIndirect evidence | 321 | |||
“At SKS, we pride ourselves on being different.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 3 | 317 | ||||
“GI Outsourcing is a UK-based accountants outsourcing firm.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 4 | 132 | ||||
“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…” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 5 | 96 | ||||
“Affinity Outsourcing is an accountancy outsourcing company that specialises in outsourcing for Accounting Practices.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 6 | 68 | ||||
“Isosceles Finance Helping ambitious businesses grow Isosceles is a business services company supporting rapidly growing and investor-backed companies with fractional CFO services…” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 7 | 63 | ||||
“ARNA Accounting Pvt Limited is expert in FinTech.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 8 | 57 | ||||
“We are on a mission to help accountants to grow their accountancy practice and become more profitable.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 9 | 54 | ||||
“Acenteus Accounting, legally known as Acenteus CCA Global Ltd is a UK-registered outsourced accounting and finance partner delivering secure, cloud-enabled support for…” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 10 | 51 | ||||
“At Artifin Accountants we strive to provide a more open experience of accounting services for business owners.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 11 | 44 | ||||
“We offer a CFO-led virtual finance team.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 12 | 27 | ||||
“Financial experts offering management accounts, bookkeeping, credit control, payroll and project services onsite at your premises or offsite.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 13 | 27 | ||||
“Finex Accounting is an outsourcing accountancy service provider.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 14 | 20 | ||||
“In 1995 the Doshi family set up Doshi & Co in London as an accountancy practice for UK clients and simply offshored their very own back office in Gujarat, India in - a location…” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 15 | 18 | ||||
“For each and every client we create an individually tailored accountancy package.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 16 | 16 | ||||
“We want to improve your business and help in areas that you probably didn't expect from accountants.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 17 | 15 | ||||
“WHY AAT?” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 18 | 15 | ||||
“With over 19 years of experience, ASESA Solutions Ltd offers world-class financial services, including comprehensive accounts management, precise bookkeeping, strategic HR…” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 19 | 14 | ||||
“As specialist providers of outsourced bookkeeping, management accounts and payroll solutions, we work with clients spanning a range of sectors across the various stages of the…” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 20 | 14 | ||||
“At Xcellency, we are dedicated to empowering accounting businesses to realise their fullest potential.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 21 | 13 | ||||
“55% of small businesses fail before their 5th birthday.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 22 | 13 | ||||
“Our mission at Clearcut Outsourcing is to provide exceptional accountancy outsourcing services to accountancy firms of all sizes.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 23 | 12 | ||||
“AccounTax Zone is a complete accounting and business solution that helps you keep track of your business finances, lend a hand in annual accounts, and other financial matters…” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 24 | 11 | ||||
“Credentia has been in the Accounting, Bookkeeping & Tax Advisory Out Source Solutions business since 2008.” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
| 25 | 10 | ||||
“We are a friendly team of Accountants, Bookkeepers and Payrollers, based in Bordon, Hampshire, committed to providing high quality accountancy, bookkeeping and payroll services to…” Source: company website · checked Sep 2, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 1,122 finance and accounting outsourcing companies based in the United Kingdom
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Finance and accounting outsourcing companies based in the United Kingdom at a glance
As of Sep 2, 2026Companies by employee count
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 finance and accounting outsourcing companies, 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 “finance and accounting outsourcing companies”. 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 finance and accounting outsourcing companies, 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, 1,521 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 2, 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.
Finance and accounting outsourcing companies by metro
- Finance and accounting outsourcing companies in London227
Frequently asked
How many finance and accounting outsourcing companies are there based in the United Kingdom?
RevenueBase identified 1,122 finance and accounting outsourcing companies 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?
Outbooks, headquartered in London, tops this list with the largest team on record.
Which city has the most finance and accounting outsourcing companies?
London leads with 227 headquartered companies, followed by Bristol (19) and Manchester (18).
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 1,521 verified decision-maker contacts tracked across these 1,122 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 2, 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.
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