Company lists · Data verified August 2026

Top 25 Accounting services outsourcing companies based in London, United Kingdom

Name: Accounting services outsourcing companies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 543 companies tracked

There are 543 accounting services outsourcing companies headquartered in London, United Kingdom (RevenueBase, August 2026). RevenueBase tracks 4,550 professional contacts across them, including 1,143 with verified work emails and 140 with mobile numbers. London is the largest hub.

This list covers accounting services 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. Data current as of August 28, 2026.

543Companies

4,550Contacts tracked

1,143Verified emails

140Mobile numbers

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The 25 largest accounting services outsourcing companies based in London, United Kingdom

Ranked by team size

Top 25 of 543 accounting services outsourcing companies based in London, United Kingdom, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Outbooks	London	201-500	475	39
2	SKS Business Services	London	501-1,000	321	217
3	GI Outsourcing	London	201-500	317	168
4	Obox Solution LTD	London	201-500	132	12
5	Initor Global UK	London	51-200	108	43
6	Debitam	London	51-200	103	30
7	Affinity Outsourcing Limited	London	51-200	96	32
8	Sapphire Info Solutions P LTD	London	51-200	88	28
9	Base Practice Support LTD Baseline Practice Support Smc-Pvt LTD	London	51-200	75	19
10	Stellaripe	London	51-200	57	40
11	Adler Shine	London	51-200	53	38
12	Adroit Accountax LTD	London	11-50	51	3
13	Artifin Accountants	London	11-50	51	1
14	PSB Accountants Limited	London	11-50	42	5
15	Ascendant	London	201-500	39	26
16	Jump Accounting	London	51-200	34	14
17	Bookcheck LTD	London	51-200	29	24
18	Kaizen CPA	London	51-200	22	9
19	Kress Cooper Chartered Accountants	London	11-50	20	11
20	Accnet Solutions LTD	London	11-50	20	9
21	Beatons Group	London	11-50	19	17
22	Bkcprohub Global Accounting & TAX Services	London	11-50	19	9
23	Excelsious	London	11-50	17	3
24	DAS Accounting Intl. US And UK	London	11-50	15	4
25	AAT Management Consultants	London	51-200	15	1

Showing 25 of 543 accounting services outsourcing companies based in London, United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 1,143 reachable decision-makers.

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Accounting services outsourcing companies based in London, United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 543 HQs

140Contacts with mobile numbers

22Emails re-verified in last 30 days

Companies by employee count

1-10

360

11-50

122

51-200

201-500

501-1,000

1,001-5,000

Accounting services outsourcing companies by metro in the United Kingdom

Metro	Companies
Accounting services outsourcing companies in London	543
Accounting services outsourcing companies in Manchester	60
Accounting services outsourcing companies in Bristol	38
Accounting services outsourcing companies in Birmingham	33
Accounting services outsourcing companies in Nottingham	26
Accounting services outsourcing companies in Liverpool	25
Accounting services outsourcing companies in Glasgow	22

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “accounting services outsourcing companies”, with match quality audited by blind human judging, and headquartered in London, United Kingdom.
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: Contact records re-verify on a rolling cadence; 22 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many accounting services outsourcing companies are there based in London, United Kingdom?

There are 543 accounting services outsourcing companies headquartered in London, United Kingdom as of August 2026 (RevenueBase).

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 accounting services outsourcing companies?

London leads with 543 headquartered companies, followed by Manchester (60) and Bristol (38).

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 1,143 verified decision-maker contacts tracked across these 543 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.