Company lists · Data verified August 2026

Top 25 Back office outsourcing companies based in the United Kingdom

Name: Back office outsourcing companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 335 companies tracked

There are 335 back office outsourcing companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 26,703 professional contacts across them, including 4,978 with verified work emails and 901 with mobile numbers. London is the largest hub.

This list covers back office 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. Data current as of August 28, 2026.

335Companies

26,703Contacts tracked

4,978Verified emails

901Mobile numbers

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The 25 largest back office outsourcing companies based in the United Kingdom

Ranked by team size

Top 25 of 335 back office outsourcing companies based in the 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	Smartsourcing	Bristol	201-500	464	183
5	GI Outsourcing	London	201-500	317	168
6	Obox Solution LTD	London	201-500	132	12
7	Exquisite Solution Limited	London	501-1,000	104	4
8	SOLVD	Glasgow	51-200	74	36
9	Tellida Private Limited	n/a	51-200	73	17
10	Qormotho	London	51-200	63	6
11	Direct Response	London	51-200	46	6
12	Headway BPO Solutions Headway BPO Of America	Gloucester	201-500	40	1
13	Sensible Group International	Manchester	201-500	36	3
14	Taskaler	Uk	51-200	35	3
15	Kindcare Services UK LTD	Eastbourne	51-200	31	5
16	SNT Group	Leeds	51-200	26	1
17	Servicesnow Group	Manchester	201-500	25	7
18	Doshi Outsourcing	Croydon	201-500	20	1
19	AGO Outsourcing	East Kilbride	51-200	19	1
20	Capita Business Services	London	n/a	14	6
21	Oilex LTD	Kirkton Of Skene	51-200	5	1
22	Proficient	Egerton	201-500	3	1
23	Osrec Technologies	London	51-200	3	1
24	Beech Business Services Limited	Manchester	51-200	3	1
25	Broadriver Group	Bromsgrove	51-200	2	1

Showing 25 of 335 back office outsourcing companies based in the United Kingdom

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Back office outsourcing companies based in the United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 114 HQs

901Contacts with mobile numbers

33Emails re-verified in last 30 days

Companies by employee count

1-10

153

11-50

110

51-200

201-500

501-1,000

1,001-5,000

10001+

Back office outsourcing companies by metro

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 the 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; 33 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 the United Kingdom?

There are 335 back office outsourcing companies headquartered in the 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 4,978 verified decision-maker contacts tracked across these 335 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.