Company lists · Data refreshed September 2026

Top 25 Inside sales companies based in the United Kingdom

Name: Inside sales companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 814 companies tracked

RevenueBase identified 814 inside sales companies headquartered in the United Kingdom as of September 2026 and tracks 8,435 professional contacts across them, including 1,658 with verified work emails. London is the largest hub.

This list covers inside sales 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. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 20, 2026 86% judged on-target in blind review

814Companies

8,435Contacts tracked

1,658Verified emails

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The 25 largest inside sales companies based in the United Kingdom

Ranked by team size

Top 25 of 814 inside sales companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to inside sales companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Qualifa	Indirect evidence	Brighton, United KingdomHQ checked Sep 20, 2026	51-200	440 contacts →
	Indirect evidence “We are an award winning multilingual lead generation and market research service provider for B2B publishing, marketing, events and tech companies.” Source: RevenueBase Database · checked Sep 20, 2026
2	The Telemarketing Company	Partial evidence	Brighton, United KingdomHQ checked Sep 20, 2026	201-500	243 contacts →
	Partial evidence “The Telemarketing Company is one of the UK's most trusted telemarketing agencies, delivering flexible, high-quality voice services, including pre and post sales research…” Source: RevenueBase Database · checked Sep 20, 2026
3	Engagetech	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	205 contacts →
	Partial evidence “EngageTech is the leading sales development partner for complex B2B technology companies operating in multi-stakeholder, enterprise sales environments.” Source: RevenueBase Database · checked Sep 20, 2026
4	Inside Global	Partial evidence	Liverpool, United KingdomHQ checked Sep 20, 2026	51-200	164 contacts →
	Partial evidence “Inside is a global agency dedicated to delivering growth and revenue opportunities for B2B tech companies.” Source: RevenueBase Database · checked Sep 20, 2026
5	PUNCH	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	122 contacts →
	Indirect evidence “Most B2B pipeline problems aren't a volume problem.” Source: RevenueBase Database · checked Sep 20, 2026
6	GCL	Indirect evidence	Birmingham, United KingdomHQ checked Sep 20, 2026	51-200	119 contacts →
	Indirect evidence “GCL, with its unique, non-scripted approach to telemarketing and related marketing services, has for over 30 years established an enviable reputation for providing winning lead…” Source: RevenueBase Database · checked Sep 20, 2026
7	AIR Marketing	Partial evidence	Exeter, United KingdomHQ checked Sep 20, 2026	51-200	116 contacts →
	Partial evidence “Since 2016, Air Marketing has been the trusted outsourced sales and lead generation agency in the UK for ambitious B2B businesses.” Source: RevenueBase Database · checked Sep 20, 2026
8	Durhamlane	Indirect evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 20, 2026	51-200	115 contacts →
	Indirect evidence “More than SDR Outsourcing.” Source: RevenueBase Database · checked Sep 20, 2026
9	EC Outsourcing Powered By Ison Xperiences	Indirect evidence	Doxford International Business Park, United KingdomHQ checked Sep 20, 2026	1,001-5,000	114 contacts →
	Indirect evidence “EC Outsourcing is one of the UK's leading outsourced contact centres.” Source: RevenueBase Database · checked Sep 20, 2026
10	FLOWD	Partial evidence	Manchester, United KingdomHQ checked Sep 20, 2026	11-50	104 contacts →
	Partial evidence “Flowd is an award-winning sales prospecting specialist based in the UK, Europe & US.” Source: RevenueBase Database · checked Sep 20, 2026
11	Pursuit Marketing	Indirect evidence	Glasgow, United KingdomHQ checked Sep 20, 2026	51-200	96 contacts →
	Indirect evidence “Pursuit Marketing are Experts in Demand Generation, Telemarketing, Digital Marketing and Creative Design - your 360 Marketing Provider.” Source: RevenueBase Database · checked Sep 20, 2026
12	Internal Results	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	88 contacts →
	Indirect evidence “The B2B Customer Acquisition Specialists Internal Results specialize in generating leads, promoting content, and driving brand awareness for B2B organizations worldwide through…” Source: RevenueBase Database · checked Sep 20, 2026
13	Alliance Sales Support Services Limited	Partial evidence	Tunbridge Wells, United KingdomHQ checked Sep 20, 2026	51-200	82 contacts →
	Partial evidence “Alliance Sales Support Services provides effective and sustainable sales solutions for your business.” Source: RevenueBase Database · checked Sep 20, 2026
14	Creative Media	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	66 contacts →
	Indirect evidence “Creative Media is a global marketing agency specializing in B2B lead generation.” Source: RevenueBase Database · checked Sep 20, 2026
15	Excelerate360	Partial evidence	Hitchin, United KingdomHQ checked Sep 20, 2026	51-200	65 contacts →
	Partial evidence “Excelerate360 offers business development and sales outsourcing services for B2B software and technology companies in the UK, Europe, and North America.” Source: RevenueBase Database · checked Sep 20, 2026
16	Voicentric LTD	Indirect evidence	Durham, United KingdomHQ checked Sep 20, 2026	51-200	64 contacts →
	Indirect evidence “Voicentric are the communication experts in scientific marketing, providing a global reach to clients in the Life and Materials Sciences.” Source: RevenueBase Database · checked Sep 20, 2026
17	Angsana NEW Business Agency	Indirect evidence	Covent Garden, United KingdomHQ checked Sep 20, 2026	11-50	61 contacts →
	Indirect evidence “Angsana is the UK’s most respected new business development and lead generation agency for Healthcare & Life Sciences, Marketing Services and Technology companies.” Source: RevenueBase Database · checked Sep 20, 2026
18	Salesar	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	59 contacts →
	Indirect evidence “Looking to fill your calendar with qualified calls?” Source: RevenueBase Database · checked Sep 20, 2026
19	Sales Force Europe	Partial evidence	Hitchin, United KingdomHQ checked Sep 20, 2026	51-200	54 contacts →
	Partial evidence “European Sales Outsourcing, B2B Lead Generation, European Business Development.” Source: RevenueBase Database · checked Sep 20, 2026
20	FLY PIE LTD	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	48 contacts →
	Partial evidence “At Fly Pie, sales outsourcing isn’t a “done-for-you” service, it’s a growth engine we build with you.” Source: RevenueBase Database · checked Sep 20, 2026
21	4marketing	Indirect evidence	Portsmouth, United KingdomHQ checked Sep 20, 2026	11-50	47 contacts →
	Indirect evidence “4Marketing is a direct marketing agency devoted to generating new business opportunities for its clients through its focused new generation of telemarketing professionals.” Source: RevenueBase Database · checked Sep 20, 2026
22	Advance Connects	Indirect evidence	Ellesmere Port, United KingdomHQ checked Sep 20, 2026	51-200	45 contacts →
	Indirect evidence “Advance Connects are a B2B telemarketing, lead generation & appointment scheduling experts, operating within various sectors including construction, built environment, industrial…” Source: RevenueBase Database · checked Sep 20, 2026
23	Broadley Speaking	Partial evidence	Tavistock, United KingdomHQ checked Sep 20, 2026	11-50	44 contacts →
	Partial evidence “With over three decades of experience, we partner with B2B sales and marketing teams to drive and nurture new customer acquisition - securing conversations with the right…” Source: RevenueBase Database · checked Sep 20, 2026
24	Beanstalk Marketing	Indirect evidence	Southend On Sea, United KingdomHQ checked Sep 20, 2026	11-50	43 contacts →
	Indirect evidence “Beanstalk is an integrated B2B Telemarketing and Lead Generation agency dedicated to helping our customers win new business.” Source: RevenueBase Database · checked Sep 20, 2026
25	Parallel Partnerships LTD	Indirect evidence	Leeds, United KingdomHQ checked Sep 20, 2026	51-200	43 contacts →
	Indirect evidence “B2B and B2C outsourced Telemarketing agency.” Source: RevenueBase Database · checked Sep 20, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: inside sales companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names inside sales companies.
Partial evidence: Its own public description names part of inside sales companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name inside sales companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 814 inside sales companies based in the United Kingdom

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Inside sales companies based in the United Kingdom at a glance

As of Sep 20, 2026

19.7%Verified-email coverage

10.4Average contacts per company

1-10Median size (employees)

28.9%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

484

11-50

243

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 814 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among inside sales companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “inside sales companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names inside sales companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among inside sales companies, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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: Every listed company carries at least one verified work email, 1,658 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 20, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Inside sales companies by metro

Inside sales companies in London235
Inside sales companies in Manchester39

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names inside sales companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many inside sales companies are there based in the United Kingdom?

RevenueBase identified 814 inside sales companies headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Qualifa, headquartered in Brighton, tops this list with the largest team on record.

Which city has the most inside sales companies?

London leads with 235 headquartered companies, followed by Manchester (39) and Birmingham (23).

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 1,658 verified decision-maker contacts tracked across these 814 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 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 with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.