Company lists · Data verified August 2026

Top 25 Data outsourcing companies based in the United Kingdom

Name: Data 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 880 companies tracked

There are 880 data outsourcing companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 36,736 professional contacts across them, including 9,262 with verified work emails and 3,021 with mobile numbers. London is the largest hub.

This list covers data 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.

880Companies

36,736Contacts tracked

9,262Verified emails

3,021Mobile numbers

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The 25 largest data outsourcing companies based in the United Kingdom

Ranked by team size

Top 25 of 880 data 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	Firstsource	Warrington	10001+	17,273	2,483
2	Oneadvanced	Birmingham	1,001-5,000	2,257	859
3	Gspann Technologies, INC	London	1,001-5,000	1,874	754
4	Caci LTD	Birmingham	1,001-5,000	1,657	783
5	Mobius Knowledge Services	London	501-1,000	1,434	60
6	Smartstream	Bristol	1,001-5,000	1,095	603
7	AB Initio Software	Weybridge	501-1,000	813	539
8	The Smart Cube	London	501-1,000	717	239
9	Management Science Associates, INC	n/a	501-1,000	520	255
10	Smartsourcing	Bristol	201-500	464	183
11	Seargin	London	501-1,000	275	188
12	Vcreatek Consulting	Cardiff	201-500	245	64
13	Fusion Global Business Solutions	London	51-200	219	126
14	The Information LAB	London	51-200	202	102
15	Mapsystems	Portslade	201-500	192	3
16	Procode	Chandlers Ford	201-500	186	3
17	Cloudsmiths	London	51-200	150	8
18	Sagacity	London	51-200	148	105
19	Simpson Associates	York	51-200	116	70
20	Aker Systems	Bicester	51-200	113	78
21	Calligo	Leicester	201-500	111	68
22	Brickred Technologies	Chessington	501-1,000	100	5
23	Groupbwt	London	51-200	92	7
24	AQB Solutions PVT LTD	London	51-200	86	4
25	Growth HUB	London	51-200	84	8

Showing 25 of 880 data outsourcing companies based in the United Kingdom

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Data outsourcing companies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 360 HQs

3,021Contacts with mobile numbers

16Emails re-verified in last 30 days

Companies by employee count

1-10

559

11-50

209

51-200

201-500

501-1,000

1,001-5,000

10001+

Data outsourcing companies by metro

Metro	Companies
Data outsourcing companies in London	360
Data outsourcing companies in Manchester	30
Data outsourcing companies in Leeds	17
Data outsourcing companies in Reading	12
Data outsourcing companies in Birmingham	11
Data outsourcing companies in Edinburgh	10
Data outsourcing companies in Bristol	9

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 “data 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; 16 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 data outsourcing companies are there based in the United Kingdom?

There are 880 data outsourcing companies headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Firstsource, headquartered in Warrington, tops this list with the largest team on record.

Which city has the most data outsourcing companies?

London leads with 360 headquartered companies, followed by Manchester (30) and Leeds (17).

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 9,262 verified decision-maker contacts tracked across these 880 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.