Company lists · Data refreshed September 2026
Top 25 Sales development outsourcing companies based in the United Kingdom
RevenueBase identified 870 sales development outsourcing companies headquartered in the United Kingdom as of September 2026 and tracks 6,717 professional contacts across them, including 1,503 with verified work emails and 340 with mobile numbers. London is the largest hub.
This list covers sales development 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. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 6, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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.
The 25 largest sales development outsourcing companies based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 358 | ||||
“At Algominds, we build AI agents that find you customers who already want to buy.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | 205 | ||||
“EngageTech is the leading sales development partner for complex B2B technology companies operating in multi-stakeholder, enterprise sales environments.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | Inside GlobalIndirect evidence | 164 | |||
“Inside is a global agency dedicated to delivering growth and revenue opportunities for B2B tech companies.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | 160 | ||||
“We’re The Point Company, the team behind some of the fastest-scaling B2B companies in tech, SaaS and cybersecurity, working across five continents from North America and LATAM to…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | 122 | ||||
“Most B2B pipeline problems aren't a volume problem.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | 116 | ||||
“Since 2016, Air Marketing has been the trusted outsourced sales and lead generation agency in the UK for ambitious B2B businesses.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | 115 | ||||
“More than SDR Outsourcing.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | 104 | ||||
“Flowd is an award-winning sales prospecting specialist based in the UK, Europe & US.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | 82 | ||||
“Alliance Sales Support Services provides effective and sustainable sales solutions for your business.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | 75 | ||||
“Voice is an agency that specialises in customer acquisition, development and retention programs.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | 65 | ||||
“Excelerate360 offers business development and sales outsourcing services for B2B software and technology companies in the UK, Europe, and North America.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | 63 | ||||
“LTK are a outsourced solutions provider, assisting you to reach your goals through customer retention, sales growth, business & strategy development/ implementation and people…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | 61 | ||||
“Angsana is the UK’s most respected new business development and lead generation agency for Healthcare & Life Sciences, Marketing Services and Technology companies.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | 59 | ||||
“Looking to fill your calendar with qualified calls?” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | 59 | ||||
“Consult us for.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | 54 | ||||
“European Sales Outsourcing, B2B Lead Generation, European Business Development.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | 53 | ||||
“Most UK SMEs hit the same two walls.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 18 | 48 | ||||
“At Fly Pie, sales outsourcing isn’t a “done-for-you” service, it’s a growth engine we build with you.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 19 | 47 | ||||
“4Marketing is a direct marketing agency devoted to generating new business opportunities for its clients through its focused new generation of telemarketing professionals.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 20 | 45 | ||||
“Advance Connects are a B2B telemarketing, lead generation & appointment scheduling experts, operating within various sectors including construction, built environment, industrial…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 21 | 44 | ||||
“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: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 22 | 43 | ||||
“B2B and B2C outsourced Telemarketing agency.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 23 | 43 | ||||
“Pipeline is a collective of sales professionals, united in our passion and drive for commercial success.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 24 | 41 | ||||
“The problem with B2B growth isn't a lack of activity.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 25 | TrainyoIndirect evidence | 41 | |||
“TrainYo is creating fair opportunities for all in the technology sector We also believe hiring and training is kinda tough!” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 870 sales development outsourcing companies based in the United Kingdom
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Sales development outsourcing companies based in the United Kingdom at a glance
As of Sep 6, 2026Companies by employee count
Verified emails by last verification
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 sales development outsourcing companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “sales development outsourcing companies”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among sales development outsourcing 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 an evidence 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, 1,503 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 6, 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.
Sales development outsourcing companies by metro
- Sales development outsourcing companies in London299
- Sales development outsourcing companies in Manchester43
Frequently asked
How many sales development outsourcing companies are there based in the United Kingdom?
RevenueBase identified 870 sales development outsourcing 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?
Algominds, headquartered in London, tops this list with the largest team on record.
Which city has the most sales development outsourcing companies?
London leads with 299 headquartered companies, followed by Manchester (43) and Birmingham (22).
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 1,503 verified decision-maker contacts tracked across these 870 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 6, 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 SmartSearch, 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.
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