Company lists · Data verified August 2026

Top 19 Cold calling agencies based in London, United Kingdom

Name: Cold calling agencies 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 86 companies tracked

There are 86 cold calling agencies headquartered in London, United Kingdom (RevenueBase, August 2026). RevenueBase tracks 936 professional contacts across them, including 74 with verified work emails and 17 with mobile numbers. London is the largest hub.

This list covers cold calling agencies 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.

86Companies

936Contacts tracked

74Verified emails

17Mobile numbers

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The 19 largest cold calling agencies based in London, United Kingdom

Ranked by team size

Top 19 of 86 cold calling agencies 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	BNZSA	London	201-500	195	6
2	Marathon B2B	London	51-200	52	1
3	Advance Connects	London	51-200	45	20
4	Seventic	London	11-50	38	4
5	Prospectaware	London	11-50	22	8
6	Appointment Setter	London	1-10	18	2
7	BIG Wolf Marketing	London	51-200	16	1
8	Adds Corporation	London	51-200	16	1
9	The Sales Centre	London	1-10	14	6
10	Belexway Services	London	1-10	14	1
11	Salessourcers	London	11-50	12	4
12	Real Calling	London	11-50	10	7
13	Transaction Focus	London	11-50	10	7
14	Credence Business Consultants	London	1-10	3	1
15	Bring Commerce	London	11-50	2	1
16	Niche Marketing LTD	London	1-10	2	1
17	Nsibandze Outsourcing NOS	London	11-50	1	1
18	Killer Cold Email	London	1-10	1	1
19	Leadgenunlocked	London	1-10	1	1

Showing 19 of 86 cold calling agencies based in London, United Kingdom

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Cold calling agencies based in London, United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 86 HQs

17Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

10001+

Cold calling agencies by metro in the United Kingdom

Metro	Companies
Cold calling agencies in London	86
Cold calling agencies in Manchester	19
Cold calling agencies in Birmingham	14
Cold calling agencies in Leeds	12
Cold calling agencies in Bristol	8
Cold calling agencies in Oxford	5
Cold calling agencies in Portsmouth	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 “cold calling agencies”, 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; 0 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 cold calling agencies are there based in London, United Kingdom?

There are 86 cold calling agencies headquartered in London, United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

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

Which city has the most cold calling agencies?

London leads with 86 headquartered companies, followed by Manchester (19) and Birmingham (14).

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 74 verified decision-maker contacts tracked across these 86 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.