Company lists · Data refreshed September 2026

Top 25 Finance and accounting business process outsourcing companies based in London, United Kingdom

Name: Finance and accounting business process outsourcing companies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 120 companies tracked

RevenueBase identified 120 finance and accounting business process outsourcing companies headquartered in London, United Kingdom as of September 2026 and tracks 2,049 professional contacts across them, including 453 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers finance and accounting business process outsourcing companies headquartered in London, 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 28, 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 28, 2026 86% judged on-target in blind review

120Companies

2,049Contacts tracked

453Verified emails

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The 25 largest finance and accounting business process outsourcing companies based in London, United Kingdom

Ranked by team size

Top 25 of 120 finance and accounting business process outsourcing companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to finance and accounting business 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	SKS Business Services	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	501-1,000	322 contacts →
	Indirect evidence “At SKS, we pride ourselves on being different.” Source: RevenueBase Database · checked Sep 28, 2026
2	Xanadutec	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	70 contacts →
	Strong evidence “We are a 400 member strong, specialist business process outsourcing (BPO) provider that caters to the diverse and complex information processing needs of todays corporation.” Source: RevenueBase Database · checked Sep 28, 2026
3	Arna Accounting PVT LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	63 contacts →
	Partial evidence “ARNA Accounting Pvt Limited is expert in FinTech.” Source: RevenueBase Database · checked Sep 28, 2026
4	Stellaripe	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	58 contacts →
	Indirect evidence “We are on a mission to help accountants to grow their accountancy practice and become more profitable.” Source: RevenueBase Database · checked Sep 28, 2026
5	Oakford Advisors LTD	Indirect evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
6	Liberate Accountants	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	22 contacts →
	Partial 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 28, 2026
7	Abacus Resource Solutions	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	20 contacts →
	Strong evidence “As a leadership team with more than 45 years’ combined experience, our mission is to enable businesses to focus on growth and profitability by offering bespoke Finance, Accounting…” Source: RevenueBase Database · checked Sep 28, 2026
8	Bitesize Consulting	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	16 contacts →
	Strong 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 28, 2026
9	Excelsious	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	16 contacts →
	Strong evidence “Excelsious provides accounting, bookkeeping and finance function outsourcing services to accountancy firms and small to medium enterprises.” Source: RevenueBase Database · checked Sep 28, 2026
10	Fresh Financials Group	Partial evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
11	BM Connect Limited	Indirect evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
12	AMS Admin Services	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	10 contacts →
	Strong evidence “AMS Admin Services: Accounting Made Simple At AMS Admin Services, we are dedicated to making accounting and financial management effortless and efficient for a wide array of…” Source: RevenueBase Database · checked Sep 28, 2026
13	CLIC	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	9 contacts →
	Indirect evidence “Own a small business?” Source: RevenueBase Database · checked Sep 28, 2026
14	Venn Accounts B Corp Certified	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	8 contacts →
	Partial evidence “Venn Accounts is an accountancy and finops practice focussed on providing an all-encompassing finance service for small businesses, that do not need to hire a full time in-house…” Source: RevenueBase Database · checked Sep 28, 2026
15	Arkius Global LTD	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	6 contacts →
	Strong evidence “Arkius Global is a trusted provider of expert Accounting, Payroll, and Compliance outsourcing services for businesses across the UK, US, EU, and Australia.” Source: RevenueBase Database · checked Sep 28, 2026
16	London Accountants	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	6 contacts →
	Indirect evidence “London Accountants and Partners was established in 2010.” Source: RevenueBase Database · checked Sep 28, 2026
17	Realtime Finance	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	5 contacts →
	Partial evidence “RealTime Finance was founded in January 2017 by experienced CFOs, Bryan Lawrie and Kim Dovell who have worked with numerous businesses to transform the effectiveness and output of…” Source: RevenueBase Database · checked Sep 28, 2026
18	Clearstone Business Services LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	5 contacts →
	Partial evidence “We help to provide business owners and their families with financial security and to enable them to have the lives that they want to lead, by helping them to grow their business…” Source: RevenueBase Database · checked Sep 28, 2026
19	Onetribeadvisory	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	5 contacts →
	Partial evidence “At onetribe we connect business with finance.” Source: RevenueBase Database · checked Sep 28, 2026
20	ASG Corp	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	5 contacts →
	Partial evidence “ASG is a specialist provider of accounting and office support services to various business owners.” Source: RevenueBase Database · checked Sep 28, 2026
21	Casa Bookkeeping	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	5 contacts →
	Indirect evidence “Naturally, accurate and timely reporting is paramount – but at CASA we don’t stop there.” Source: RevenueBase Database · checked Sep 28, 2026
22	Axcelera	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	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 28, 2026
23	Pinnacleoss UK	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	5 contacts →
	Strong evidence “PinnacleOSS offers a tailored accounting service, designed to work as an extension to your existing finance team or, if you’d prefer, as an alternative to hiring one at all.” Source: RevenueBase Database · checked Sep 28, 2026
24	Best Bookkeeping Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	4 contacts →
	Partial evidence “BEST BOOKKEEPING is an outsourced accounting service based in London SW18, United Kingdom.” Source: RevenueBase Database · checked Sep 28, 2026
25	FAAF	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	4 contacts →
	Partial evidence “FaaF (Finance as a Function) was built to make finance feel more human.” Source: RevenueBase Database · checked Sep 28, 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: finance and accounting business 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 finance and accounting business process outsourcing companies.
Partial evidence: Its own public description names part of finance and accounting business 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 finance and accounting business 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 120 finance and accounting business process outsourcing companies based in London, United Kingdom

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Finance and accounting business process outsourcing companies based in London, United Kingdom at a glance

As of Sep 28, 2026

22.1%Verified-email coverage

17.1Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 120 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 finance and accounting business 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 London, United Kingdom whose own description of what they do matches “finance and accounting business 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 finance and accounting business 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 finance and accounting business process outsourcing companies, and records with no verified work email. Companies headquartered outside London 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, 453 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 28, 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.

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 finance and accounting business 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 finance and accounting business process outsourcing companies are there based in London, United Kingdom?

RevenueBase identified 120 finance and accounting business process outsourcing companies headquartered in London, 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?

SKS Business Services, headquartered in London, tops this list with the largest team on record.

Which city in the United Kingdom has the most finance and accounting business process outsourcing companies?

London leads the United Kingdom with 120 headquartered companies, followed by Bristol (9) and Manchester (8).

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 453 verified decision-maker contacts tracked across these 120 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 28, 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.