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, its RevenueBase Smart Search rating, 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 Smart Search, 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 Smart Search rating 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. RevenueBase Smart Search rates how each company's information relates to financial process outsourcing companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Outbooks	Partial evidence	London, United Kingdom	201-500	475 contacts →
	Partial evidence “Outbooks is a leading provider of outsourcing services to accounting and bookkeeping firms.” Source: RevenueBase Database · checked Sep 2, 2026
2	The CFO Centre UK	Partial evidence	Swindon, United Kingdom	51-200	468 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 2, 2026
3	SKS Business Services	Indirect evidence	London, United Kingdom	501-1,000	321 contacts →
	Indirect evidence “At SKS, we pride ourselves on being different.” Source: RevenueBase Database · checked Sep 2, 2026
4	GI Outsourcing	Partial evidence	London, United Kingdom	201-500	317 contacts →
	Partial evidence “GI Outsourcing is a UK-based accountants outsourcing firm.” Source: RevenueBase Database · checked Sep 2, 2026
5	Obox Solution LTD	Partial evidence	London, United Kingdom	201-500	132 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 2, 2026
6	Arna Accounting PVT LTD	Indirect evidence	London, United Kingdom	51-200	63 contacts →
	Indirect evidence “ARNA Accounting Pvt Limited is expert in FinTech.” Source: RevenueBase Database · checked Sep 2, 2026
7	Industry Resource Services IRS Group	Indirect evidence	Beccles, United Kingdom	11-50	47 contacts →
	Indirect evidence “Leading providers of specialist support services.” Source: RevenueBase Database · checked Sep 2, 2026
8	Green & Purple	Indirect evidence	Cambridge, United Kingdom	51-200	44 contacts →
	Indirect evidence “We offer a CFO-led virtual finance team.” Source: RevenueBase Database · checked Sep 2, 2026
9	Team Factors LTD	Indirect evidence	Apsley, United Kingdom	11-50	31 contacts →
	Indirect evidence “At Team Factors, we help businesses with cash flow finance and provide them with the funds they need to grow their business.” Source: RevenueBase Database · checked Sep 2, 2026
10	accountables.com	Partial evidence	Glasgow City, United Kingdom	11-50	29 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 2, 2026
11	Oakford Advisors LTD	Indirect evidence	Oxford, United Kingdom	11-50	24 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 2, 2026
12	TOP Resource Group	Partial evidence	Preston, United Kingdom	11-50	22 contacts →
	Partial evidence “Top Resource Group is your one-stop ally for all business outsourcing needs.” Source: RevenueBase Database · checked Sep 2, 2026
13	Liberate Accountants	Indirect evidence	London, United Kingdom	11-50	20 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 2, 2026
14	Excelsious	Partial evidence	London, United Kingdom	11-50	17 contacts →
	Partial evidence “Excelsious provides accounting, bookkeeping and finance function outsourcing services to accountancy firms and small to medium enterprises.” Source: RevenueBase Database · checked Sep 2, 2026
15	Asesa Solutions LTD	Partial evidence	London, United Kingdom	11-50	15 contacts →
	Partial evidence “With over 19 years of experience, ASESA Solutions Ltd offers world-class financial services, including comprehensive accounts management, precise bookkeeping, strategic HR…” Source: RevenueBase Database · checked Sep 2, 2026
16	BM Connect Limited	Indirect evidence	London, United Kingdom	11-50	14 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 2, 2026
17	Clearcut Outsourcing UK	Partial evidence	Manchester, United Kingdom	201-500	13 contacts →
	Partial evidence “Our mission at Clearcut Outsourcing is to provide exceptional accountancy outsourcing services to accountancy firms of all sizes.” Source: RevenueBase Database · checked Sep 2, 2026
18	Fresh Financials Group	Partial evidence	London, United Kingdom	11-50	12 contacts →
	Partial evidence “At Fresh Financials, we offer a suite of financial operations services designed to simplify your business.” Source: RevenueBase Database · checked Sep 2, 2026
19	MNE Accounting	Partial evidence	Leicester, United Kingdom	11-50	12 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 2, 2026
20	BCA Accountants And Business Advisors	Indirect evidence	Hull, United Kingdom	11-50	11 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 2, 2026
21	Business Garage	Strong evidence	Wantage, United Kingdom	11-50	10 contacts →
	Strong evidence “We are Business Garage: providing business outsourcing and consultancy services for SMEs: Business Strategy, Financial Management, Payroll, Bookkeeping, HR Consultancy and more!” Source: RevenueBase Database · checked Sep 2, 2026
22	Portt & CO	Indirect evidence	Taunton, United Kingdom	11-50	8 contacts →
	Indirect evidence “Taking the pressure away from small business owners by providing a 'smorgasbord' of expert outsourced finance services.” Source: RevenueBase Database · checked Sep 2, 2026
23	Troy Business Services LTD	Indirect evidence	Ashby-De-La-Zouch, United Kingdom	11-50	5 contacts →
	Indirect evidence “From bookkeeping to management reporting, HR to payroll we give you the extra support you need to stay in control of your business.” Source: RevenueBase Database · checked Sep 2, 2026
24	Fl3xibooks	Partial evidence	Uckfield, United Kingdom	11-50	5 contacts →
	Partial evidence “Fl3xiBooks is a dynamic business outsourcing and bookkeeping service committed to delivering reliable, friendly, and professional support.” Source: RevenueBase Database · checked Sep 2, 2026
25	Axcelera	Partial evidence	London, United Kingdom	11-50	5 contacts →
	Partial evidence “At Axcelera, we believe that every business deserves access to strategic, operational, and day-to-day financial excellence.” Source: RevenueBase Database · checked Sep 2, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: financial process outsourcing companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names financial process outsourcing companies.
Partial evidence: Its own public description names part of financial process outsourcing companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name financial process outsourcing companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

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

33.5%Verified-email coverage

4.5%Mobile-number coverage

11.2Average contacts per company

1-10Median size (employees)

31.6%Largest-city concentration · London

Sep 2, 2026Page data 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 RevenueBase Smart Search 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 Smart Search, 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.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names financial process outsourcing companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
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 its RevenueBase Smart Search 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

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names financial process outsourcing companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

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 Smart Search, 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.