Company lists · Data refreshed November 2026

Top 22 Online agencies based in the United Kingdom

Name: Online agencies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 15,768 companies tracked

RevenueBase identified 15,768 company matches for online agencies associated with the United Kingdom as of November 2026 and tracks 101,527 professional contacts across them, including 19,610 with verified work emails. London is the largest hub.

This list covers company matches for online agencies associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 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.

How to read this list RevenueBase SmartSearch · Exact Recorded Nov 6, 2026 How this list was built

15,768Companies

101,527Contacts tracked

19,610Verified emails

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The 22 largest online agencies based in the United Kingdom

Ranked by team size

Top 22 of 15,768 company matches for online agencies based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Marketizon	Exact match	London, United KingdomHQ recorded Nov 6, 2026	n/a	1,989 contacts →
	Exact match “Marketizon is the leader in developing innovative, multi-channel marketing technologies.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	YELL	Exact match	Reading, United KingdomHQ recorded Nov 6, 2026	501-1,000	1,353 contacts →
	Exact match “Since 1966, we’ve been helping UK businesses grow – from printed ads in the Yellow Pages to powerful, AI-driven digital marketing that delivers real results.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Linney	Exact match	Mansfield, United KingdomHQ recorded Nov 6, 2026	1,001-5,000	689 contacts →
	Exact match “We’re Linney, a connected marketing partner helping brands turn complexity into clarity across digital, physical and ecommerce channels.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	Promodo Digital Agency	Exact match	Lincoln, United KingdomHQ recorded Nov 6, 2026	201-500	375 contacts →
	Exact match “Promodo is an award-winning performance marketing agency and a reliable partner for driving measurable results in eCommerce.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	Merkle Emea	Exact match	London, United KingdomHQ recorded Nov 6, 2026	5,001-10,000	344 contacts →
	Exact match “Merkle, a dentsu company, powers the experience economy.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	Barrhead Travel Group	Exact match	Glasgow, United KingdomHQ recorded Nov 6, 2026	501-1,000	319 contacts →
	Exact match “At Barrhead Travel, we believe that it’s our people that make our business, and we recognise that much of the company’s success can be directly attributed to the hard work…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	ADD People	Exact match	Altrincham, United KingdomHQ recorded Nov 6, 2026	201-500	309 contacts →
	Exact match “We’re Add People, a team of digital marketing professionals dedicated to helping small to medium-sized businesses grow online.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Greenpark	Exact match	London, United KingdomHQ recorded Nov 6, 2026	201-500	294 contacts →
	Exact match “Greenpark is a global, award-winning digital agency.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	Eskimoz	Exact match	London, United KingdomHQ recorded Nov 6, 2026	201-500	240 contacts →
	Exact match “Eskimoz is an international digital acquisition agency that helps businesses optimise their revenue and boost their growth through digital channels such as GEO, SEO, Paid Search…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	KRIFY	Exact match	London, United KingdomHQ recorded Nov 6, 2026	51-200	235 contacts →
	Exact match “Krify is a results-driven technology company specializing in crafting user-centric mobile apps, web applications, and software solutions.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	GO Inspire Group	Exact match	Leicester, United KingdomHQ recorded Nov 6, 2026	201-500	227 contacts →
	Exact match “Welcome to Go Inspire - Your Marketing Performance Partner!” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	MTC	Exact match	Dundee, United KingdomHQ recorded Nov 6, 2026	51-200	221 contacts →
	Exact match “Formed in and based in Dundee with offices in Edinburgh and Europe, mtc.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	BIG Group	Exact match	London, United KingdomHQ recorded Nov 6, 2026	51-200	198 contacts →
	Exact match “Founded in 1991, with offices in Amsterdam, Bath, Dubai and London our award-winning employee-owned company has consistently ranked as one of the UK's leading independent digital…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	Thomson Local	Exact match	Farnborough, United KingdomHQ recorded Nov 6, 2026	201-500	198 contacts →
	Exact match “Think Local, Think Thomsonlocal!” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	Impression	Exact match	Nottingham, United KingdomHQ recorded Nov 6, 2026	51-200	186 contacts →
	Exact match “We're a performance marketing agency setting the new standard of excellence through our people, our performance and our technology, with offices in Manchester, Nottingham, London…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Kinesso Uk&i	Exact match	London, United KingdomHQ recorded Nov 6, 2026	501-1,000	183 contacts →
	Exact match “KINESSO UK is the award-winning, tech-driven performance marketing agency delivering actionable growth for direct clients and agency partners.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	Ics-Digital	Exact match	Leeds, United KingdomHQ recorded Nov 6, 2026	51-200	163 contacts →
	Exact match “ICS-digital is a global SEO, content, advertising, translation & digital PR agency working in over 100 languages, across over 90 markets in the most highly regulated and highly…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Connective3	Exact match	Leeds, United KingdomHQ recorded Nov 6, 2026	51-200	156 contacts →
	Exact match “We are a specialist performance marketing agency, and we deliver unrivalled performance for our clients on a global scale.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	CTI Digital	Exact match	Manchester, United KingdomHQ recorded Nov 6, 2026	51-200	139 contacts →
	Exact match “We are CTI Digital, an award-winning team of 150+ strategists, designers, marketers and developers.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	CHS	Exact match	Christchurch, United KingdomHQ recorded Nov 6, 2026	51-200	135 contacts →
	Exact match “We connect brands with customers.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	Netmatters	Exact match	Norwich, United KingdomHQ recorded Nov 6, 2026	51-200	129 contacts →
	Exact match “Netmatters is an award-winning technology and digital agency helping businesses across the UK grow through innovative technology, expert support and strategic digital marketing.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	E Intelligence	Exact match	London, United KingdomHQ recorded Nov 6, 2026	51-200	124 contacts →
	Exact match “e intelligence is a renowned global leader in the digital marketing space.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “online agencies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 22 of 15,768 online agencies based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 19,610 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Online agencies based in the United Kingdom at a glance

As of Nov 6, 2026

19.3%Verified-email coverage

6.4Average contacts per company

1-10Median size (employees)

28.8%Largest-city concentration · London

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

11,946

11-50

3,106

51-200

477

201-500

501-1,000

1,001-5,000

5,001-10,000

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 15,768 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

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: Company records associated with the United Kingdom whose business descriptions match “online agencies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 19,610 professional contacts with verified work emails across the full matched dataset. 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 November 6, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Online agencies by metro

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “online agencies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many online agencies are there based in the United Kingdom?

RevenueBase identified 15,768 company matches for online agencies associated with the United Kingdom as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Marketizon tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most online agencies?

London leads with 4536 company records, followed by Manchester (590) and Birmingham (367).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 19,610 professional contacts with verified work emails tracked across these 15,768 companies; direct dials are available where recorded.

How current is this list?

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