Company lists · Data verified August 2026

Top 25 Call center outsourcing companies based in the United Kingdom

Name: Call center 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 329 companies tracked

There are 329 call center outsourcing companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 8,414 professional contacts across them, including 941 with verified work emails and 329 with mobile numbers. London is the largest hub.

This list covers call center 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.

329Companies

8,414Contacts tracked

941Verified emails

329Mobile numbers

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The 25 largest call center outsourcing companies based in the United Kingdom

Ranked by team size

Top 25 of 329 call center 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	Convergys Intelligent Contact	Manchester	10001+	876	37
2	Vertex Data Science	London	51-200	570	1
3	RESQ	Seaham	1,001-5,000	493	149
4	ANT Marketing	Sheffield	501-1,000	328	35
5	The Contact Company	Wirral	1,001-5,000	324	17
6	The Telemarketing Company	Brighton	201-500	242	39
7	Response	n/a	1,001-5,000	241	67
8	Clearanswer Call Centres	Leeds	501-1,000	202	24
9	Interact Contact Centres	Richmond	501-1,000	159	75
10	Echo-U LTD	Newcastle Upon Tyne	201-500	140	7
11	We ARE Woven	Bristol	1,001-5,000	131	11
12	Step Change Outsourcing	Stevenage	201-500	115	20
13	EC Outsourcing Powered By Ison Xperiences	Sheffield	1,001-5,000	115	1
14	Exquisite Solution Limited	London	501-1,000	104	4
15	Rsvp Media Response LTD	London	201-500	95	22
16	Subfero	Bristol	51-200	84	2
17	FM Outsource	Bury	201-500	82	33
18	Connect Assist	Cardiff	201-500	73	24
19	Tellida Private Limited	n/a	51-200	73	17
20	Callcare	London	1,001-5,000	59	13
21	Impact Call Centre	Romsey	201-500	55	14
22	Orca Call Answering & Live Chat	Wrexham	51-200	54	12
23	Cymphony	Crewe	51-200	52	15
24	Direct Response	London	51-200	46	6
25	Parallel Partnerships LTD	Leeds	51-200	43	7

Showing 25 of 329 call center outsourcing companies based in the United Kingdom

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Call center outsourcing companies based in the United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 86 HQs

329Contacts with mobile numbers

3Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

104

51-200

201-500

501-1,000

1,001-5,000

10001+

Call center outsourcing companies by metro

Metro	Companies
Call center outsourcing companies in London	86
Call center outsourcing companies in Manchester	15
Call center outsourcing companies in Bristol	8
Call center outsourcing companies in Leeds	7
Call center outsourcing companies in Birmingham	7
Call center outsourcing companies in Sheffield	6
Call center outsourcing companies in Newcastle Upon Tyne	5

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 “call center 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; 3 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 call center outsourcing companies are there based in the United Kingdom?

There are 329 call center outsourcing companies headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Convergys Intelligent Contact, headquartered in Manchester, tops this list with the largest team on record.

Which city has the most call center outsourcing companies?

London leads with 86 headquartered companies, followed by Manchester (15) and Bristol (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 941 verified decision-maker contacts tracked across these 329 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.