Company lists · Data verified August 2026

Top 17 Back office outsourcing companies based in London, United Kingdom

Name: Back office 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 114 companies tracked

There are 114 back office outsourcing companies headquartered in London, United Kingdom (RevenueBase, August 2026). RevenueBase tracks 23,731 professional contacts across them, including 4,543 with verified work emails and 774 with mobile numbers. London is the largest hub.

This list covers back office 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.

114Companies

23,731Contacts tracked

4,543Verified emails

774Mobile numbers

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The 17 largest back office outsourcing companies based in London, United Kingdom

Ranked by team size

Top 17 of 114 back office 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	Capita	London	10001+	20,872	4,256
2	Vertex Data Science	London	51-200	570	1
3	Outbooks	London	201-500	475	39
4	GI Outsourcing	London	201-500	317	168
5	Obox Solution LTD	London	201-500	132	12
6	Exquisite Solution Limited	London	501-1,000	104	4
7	Qormotho	London	51-200	63	6
8	Direct Response	London	51-200	46	6
9	Factotum	London	11-50	39	23
10	Capita Business Services	London	n/a	14	6
11	IH Solutions	London	11-50	12	2
12	Syncogic Global Solutions	London	11-50	10	1
13	Accuco	London	11-50	6	5
14	Löngun	London	11-50	4	1
15	Osrec Technologies	London	51-200	3	1
16	VAYO	London	11-50	3	1
17	Brigade Solutions LTD	London	11-50	2	1

Showing 17 of 114 back office outsourcing companies based in London, United Kingdom

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Back office outsourcing companies based in London, United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 114 HQs

774Contacts with mobile numbers

9Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Back office outsourcing companies by metro in the United Kingdom

Metro	Companies
Back office outsourcing companies in London	114
Back office outsourcing companies in Manchester	17
Back office outsourcing companies in Birmingham	8
Back office outsourcing companies in Leeds	6
Back office outsourcing companies in Leicester	4
Back office outsourcing companies in Bristol	4
Back office outsourcing companies in Peterborough	3

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 “back office 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; 9 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 back office outsourcing companies are there based in London, United Kingdom?

There are 114 back office outsourcing companies headquartered in London, United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Capita, headquartered in London, tops this list with the largest team on record.

Which city has the most back office outsourcing companies?

London leads with 114 headquartered companies, followed by Manchester (17) and Birmingham (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 4,543 verified decision-maker contacts tracked across these 114 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.