Company lists · Data refreshed September 2026

Top 25 Financial outsourcing companies based in the United Kingdom

Name: Financial 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 21, 2026 737 companies tracked

RevenueBase identified 737 financial outsourcing companies headquartered in the United Kingdom as of September 2026 and tracks 3,865 professional contacts across them, including 1,059 with verified work emails. London is the largest hub.

This list covers financial 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 21, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 21, 2026 86% judged on-target in blind review

737Companies

3,865Contacts tracked

1,059Verified emails

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The 25 largest financial outsourcing companies based in the United Kingdom

Ranked by team size

Top 25 of 737 financial outsourcing companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to financial 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	Harrow, United KingdomHQ checked Sep 21, 2026	201-500	477 contacts →
	Partial evidence “Outbooks is a leading provider of outsourcing services to accounting and bookkeeping firms.” Source: RevenueBase Database · checked Sep 21, 2026
2	SKS Business Services	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	501-1,000	322 contacts →
	Indirect evidence “At SKS, we pride ourselves on being different.” Source: RevenueBase Database · checked Sep 21, 2026
3	GI Outsourcing	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	311 contacts →
	Partial evidence “GI Outsourcing is a UK-based accountants outsourcing firm.” Source: RevenueBase Database · checked Sep 21, 2026
4	Finance & Accounting For Business	Indirect evidence	Rushden, United KingdomHQ checked Sep 21, 2026	n/a	166 contacts →
	Indirect evidence “For your business to succeed.” Source: RevenueBase Database · checked Sep 21, 2026
5	Isosceles Finance	Indirect evidence	Egham, United KingdomHQ checked Sep 21, 2026	51-200	67 contacts →
	Indirect evidence “Isosceles Finance Helping ambitious businesses grow Isosceles is a business services company supporting rapidly growing and investor-backed companies with fractional CFO services…” Source: RevenueBase Database · checked Sep 21, 2026
6	Glazers Chartered Accountants	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	39 contacts →
	Indirect evidence “Glazers is a well-established and progressive firm of accountants based in North West London.” Source: RevenueBase Database · checked Sep 21, 2026
7	Go-To Outsourcing	Partial evidence	Bromsgrove, United KingdomHQ checked Sep 21, 2026	11-50	32 contacts →
	Partial evidence “Almost every business can save time and money with smart outsourcing from Go-To - how much depends on you.” Source: RevenueBase Database · checked Sep 21, 2026
8	accountables.com	Partial evidence	Glasgow City, United KingdomHQ checked Sep 21, 2026	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 21, 2026
9	Finex Accounting	Partial evidence	Manchester, United KingdomHQ checked Sep 21, 2026	51-200	29 contacts →
	Partial evidence “Finex Accounting is an outsourcing accountancy service provider.” Source: RevenueBase Database · checked Sep 21, 2026
10	Oakford Advisors LTD	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	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 21, 2026
11	Propact Solutions	Partial evidence	Birmingham, United KingdomHQ checked Sep 21, 2026	11-50	22 contacts →
	Partial evidence “If you run an accountancy or bookkeeping firm, we can help you overcome your staff recruitment and retention challenges with our outsourcing and offshoring solutions that are…” Source: RevenueBase Database · checked Sep 21, 2026
12	Horsfield & Smith Chartered Accountants	Indirect evidence	Bury, United KingdomHQ checked Sep 21, 2026	11-50	20 contacts →
	Indirect evidence “Our firm has been in business for more than a century, combining deep local roots and a great tradition of customer care with a forward-thinking approach to business.” Source: RevenueBase Database · checked Sep 21, 2026
13	Doshi Outsourcing	Indirect evidence	Croydon, United KingdomHQ checked Sep 21, 2026	201-500	20 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 21, 2026
14	Magna Group	Indirect evidence	Leeds, United KingdomHQ checked Sep 21, 2026	1-10	17 contacts →
	Indirect evidence “We combine the perfect mix of industry-leading technology and personnel to support you in managing your workforce with greater efficiency than ever before.” Source: RevenueBase Database · checked Sep 21, 2026
15	FCL	Partial evidence	Waterlooville, United KingdomHQ checked Sep 21, 2026	11-50	17 contacts →
	Partial evidence “Flamingo Contracting Limited (FCL) operates as a business support function, offering payroll outsourcing and sub-contracting solutions to companies wishing to focus their valuable…” Source: RevenueBase Database · checked Sep 21, 2026
16	Bitesize Consulting	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	1-10	16 contacts →
	Indirect evidence “We help the best F&B, hospitality, FMCG & events businesses with Finance, Strategy & Accounting.* Outsourced finance teams * Bookkeeping, payroll & management reporting * Cash…” Source: RevenueBase Database · checked Sep 21, 2026
17	Excelsious	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	16 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 21, 2026
18	Asesa Solutions LTD	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	16 contacts →
	Partial evidence “With over 20+ years of experience, ASESA Solutions Ltd offers world-class financial services, including comprehensive accounts management, precise bookkeeping, strategic HR…” Source: RevenueBase Database · checked Sep 21, 2026
19	Modina	Partial evidence	Hitchin, United KingdomHQ checked Sep 21, 2026	1-10	14 contacts →
	Partial evidence “Modina is a friendly, professional outsourcing service dedicated to helping you stay in control of your bookkeeping and payroll.” Source: RevenueBase Database · checked Sep 21, 2026
20	Accountax Zone	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	13 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 21, 2026
21	Clearcut Outsourcing UK	Partial evidence	Manchester, United KingdomHQ checked Sep 21, 2026	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 21, 2026
22	Fresh Financials Group	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	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 21, 2026
23	BM Connect Limited	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	12 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 21, 2026
24	BCA Accountants And Business Advisors	Indirect evidence	Hull, United KingdomHQ checked Sep 21, 2026	11-50	12 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 21, 2026
25	MNE Accounting	Partial evidence	Leicester, United KingdomHQ checked Sep 21, 2026	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 21, 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 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 outsourcing companies.
Partial evidence: Its own public description names part of financial 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 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 737 financial outsourcing companies based in the United Kingdom

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Financial outsourcing companies based in the United Kingdom at a glance

As of Sep 21, 2026

27.4%Verified-email coverage

5.2Average contacts per company

1-10Median size (employees)

20.5%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

574

11-50

128

51-200

201-500

501-1,000

1,001-5,000

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 737 companies.

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 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 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 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 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, 1,059 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 21, 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 outsourcing companies by metro

Financial outsourcing companies in London151

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 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 outsourcing companies are there based in the United Kingdom?

RevenueBase identified 737 financial 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 outsourcing companies?

London leads with 151 headquartered companies, followed by Manchester (15) and Birmingham (13).

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 1,059 verified decision-maker contacts tracked across these 737 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 21, 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.