Company lists · Data refreshed September 2026

Top 25 Financial process outsourcing companies based in the United Kingdom

Name: Financial 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 2, 2026 285 companies tracked

RevenueBase identified 285 financial process outsourcing companies headquartered in the United Kingdom as of September 2026 and tracks 3,178 professional contacts across them, including 1,066 with verified work emails and 142 with mobile numbers. London is the largest hub.

This list covers financial process 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.

How to read this list Match evidence on every row Refreshed Sep 2, 2026 86% judged on-target in blind review

285Companies

3,178Contacts tracked

1,066Verified emails

142Mobile numbers

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The 25 largest financial process outsourcing companies based in the United Kingdom

Ranked by team size

Top 25 of 285 financial process outsourcing companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 2, 2026. Evidence rates how directly each company's own description names financial process outsourcing companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	OutbooksPartial evidence	London, United Kingdom	201-500	475
	“Outbooks is a leading provider of outsourcing services to accounting and bookkeeping firms.” Source: company website · checked Sep 2, 2026
2	The CFO Centre UKPartial evidence	Swindon, United Kingdom	51-200	468
	“The CFO Centre is the world's #1 provider of fractional Chief Financial Officers to SMEs with over 750 CFOs, across 18 countries* Ambitious £2m - £50m turnover companies are able…” Source: company website · checked Sep 2, 2026
3	SKS Business ServicesIndirect evidence	London, United Kingdom	501-1,000	321
	“At SKS, we pride ourselves on being different.” Source: company website · checked Sep 2, 2026
4	GI OutsourcingPartial evidence	London, United Kingdom	201-500	317
	“GI Outsourcing is a UK-based accountants outsourcing firm.” Source: company website · checked Sep 2, 2026
5	Obox Solution LTDPartial evidence	London, United Kingdom	201-500	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, 2026
6	Arna Accounting PVT LTDIndirect evidence	London, United Kingdom	51-200	63
	“ARNA Accounting Pvt Limited is expert in FinTech.” Source: company website · checked Sep 2, 2026
7	Industry Resource Services IRS GroupIndirect evidence	Beccles, United Kingdom	11-50	47
	“Leading providers of specialist support services.” Source: company website · checked Sep 2, 2026
8	Green & PurpleIndirect evidence	Cambridge, United Kingdom	51-200	44
	“We offer a CFO-led virtual finance team.” Source: company website · checked Sep 2, 2026
9	Team Factors LTDIndirect evidence	Apsley, United Kingdom	11-50	31
	“At Team Factors, we help businesses with cash flow finance and provide them with the funds they need to grow their business.” Source: company website · checked Sep 2, 2026
10	accountables.comPartial evidence	Glasgow City, United Kingdom	11-50	29
	“At Accountables, we manage the finance function for growing businesses across the US and UK, helping founders and CEOs make informed decisions with real-time financial insights.” Source: company website · checked Sep 2, 2026
11	Oakford Advisors LTDIndirect evidence	Oxford, United Kingdom	11-50	24
	“Oakford Advisors Ltd, a Centralis Group company, is an outsourced business services firm which specialises in providing back-office support to start-up or existing companies…” Source: company website · checked Sep 2, 2026
12	TOP Resource GroupPartial evidence	Preston, United Kingdom	11-50	22
	“Top Resource Group is your one-stop ally for all business outsourcing needs.” Source: company website · checked Sep 2, 2026
13	Liberate AccountantsIndirect evidence	London, United Kingdom	11-50	20
	“Liberate brings your business a fully managed, engaged and integrated finance team, without the need for full time employees but with the reliability, loyalty and trust that you…” Source: company website · checked Sep 2, 2026
14	ExcelsiousPartial evidence	London, United Kingdom	11-50	17
	“Excelsious provides accounting, bookkeeping and finance function outsourcing services to accountancy firms and small to medium enterprises.” Source: company website · checked Sep 2, 2026
15	Asesa Solutions LTDPartial evidence	London, United Kingdom	11-50	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, 2026
16	BM Connect LimitedIndirect evidence	London, United Kingdom	11-50	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, 2026
17	Clearcut Outsourcing UKPartial evidence	Manchester, United Kingdom	201-500	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, 2026
18	Fresh Financials GroupPartial evidence	London, United Kingdom	11-50	12
	“At Fresh Financials, we offer a suite of financial operations services designed to simplify your business.” Source: company website · checked Sep 2, 2026
19	MNE AccountingPartial evidence	Leicester, United Kingdom	11-50	12
	“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.” Source: company website · checked Sep 2, 2026
20	BCA Accountants And Business AdvisorsIndirect evidence	Hull, United Kingdom	11-50	11
	“From the decision to start up, the development of strategic options and planning, the implementation of control & performance measurement systems, and profit distribution each…” Source: company website · checked Sep 2, 2026
21	Business GarageStrong evidence	Wantage, United Kingdom	11-50	10
	“We are Business Garage: providing business outsourcing and consultancy services for SMEs: Business Strategy, Financial Management, Payroll, Bookkeeping, HR Consultancy and more!” Source: company website · checked Sep 2, 2026
22	Portt & COIndirect evidence	Taunton, United Kingdom	11-50	8
	“Taking the pressure away from small business owners by providing a 'smorgasbord' of expert outsourced finance services.” Source: company website · checked Sep 2, 2026
23	Troy Business Services LTDIndirect evidence	Ashby-De-La-Zouch, United Kingdom	11-50	5
	“From bookkeeping to management reporting, HR to payroll we give you the extra support you need to stay in control of your business.” Source: company website · checked Sep 2, 2026
24	Fl3xibooksPartial evidence	Uckfield, United Kingdom	11-50	5
	“Fl3xiBooks is a dynamic business outsourcing and bookkeeping service committed to delivering reliable, friendly, and professional support.” Source: company website · checked Sep 2, 2026
25	AxceleraPartial evidence	London, United Kingdom	11-50	5
	“At Axcelera, we believe that every business deserves access to strategic, operational, and day-to-day financial excellence.” Source: company website · checked Sep 2, 2026

Showing 25 of 285 financial process outsourcing companies based in the United Kingdom

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Financial process outsourcing companies based in the United Kingdom at a glance

As of Sep 2, 2026

1-10Median size (employees)

LondonLargest hub · 90 HQs

142Contacts with mobile numbers

Sep 2, 2026Data refreshed

Companies by employee count

1-10

199

11-50

51-200

201-500

501-1,000

1,001-5,000

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 financial process 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 “financial process 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 financial process 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, 1,066 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.

Financial process outsourcing companies by metro

Financial process outsourcing companies in London90

Frequently asked

How many financial process outsourcing companies are there based in the United Kingdom?

RevenueBase identified 285 financial process 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 financial process outsourcing companies?

London leads with 90 headquartered companies, followed by Manchester (8) and Leicester (5).

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 1,066 verified decision-maker contacts tracked across these 285 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.