Company lists · Data refreshed September 2026

Top 25 Enterprise SEO marketing companies based in the United Kingdom

RevenueBase identified 4,342 enterprise SEO marketing companies headquartered in the United Kingdom as of September 2026 and tracks 25,947 professional contacts across them, including 5,591 with verified work emails and 1,627 with mobile numbers. London is the largest hub.

This list covers enterprise SEO marketing 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 24, 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 24, 2026 86% judged on-target in blind review
4,342Companies
25,947Contacts tracked
5,591Verified emails
1,627Mobile numbers
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The 25 largest enterprise SEO marketing companies based in the United Kingdom

Ranked by team size
Top 25 of 4,342 enterprise SEO marketing companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 24, 2026. RevenueBase Smart Search rates how each company's information relates to enterprise SEO marketing 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Partial evidenceAltrincham, United KingdomHQ checked Sep 24, 2026201-500292 contacts →

Partial evidence

“We’re Add People, a team of digital marketing professionals dedicated to helping small to medium-sized businesses grow online.”

Source: RevenueBase Database · checked Sep 24, 2026
2Partial evidenceLeeds, United KingdomHQ checked Sep 24, 202651-200168 contacts →

Partial evidence

“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…”

Source: RevenueBase Database · checked Sep 24, 2026
3Partial evidenceLeeds, United KingdomHQ checked Sep 24, 202651-200146 contacts →

Partial evidence

“We are a specialist performance marketing agency, and we deliver unrivalled performance for our clients on a global scale.”

Source: RevenueBase Database · checked Sep 24, 2026
4Indirect evidenceLondon, United KingdomHQ checked Sep 24, 202651-200104 contacts →

Indirect evidence

“We're Found, the Everysearch™ agency.”

Source: RevenueBase Database · checked Sep 24, 2026
5Strong evidenceSheffield, United KingdomHQ checked Sep 24, 202651-20098 contacts →

Strong evidence

“The SEO Works are an award-winning provider of search marketing, websites and paid social for leading brands and prospering SME’s.”

Source: RevenueBase Database · checked Sep 24, 2026
6Strong evidenceLondon, United KingdomHQ checked Sep 24, 202651-20096 contacts →

Strong evidence

“Finixio is UK based remote first Marketing & SEO Agency helping clients all over the world.”

Source: RevenueBase Database · checked Sep 24, 2026
7Indirect evidenceLondon, United KingdomHQ checked Sep 24, 202611-5083 contacts →

Indirect evidence

“Powered by our people, our campaigns put your audience first.”

Source: RevenueBase Database · checked Sep 24, 2026
8Partial evidenceLeeds, United KingdomHQ checked Sep 24, 2026201-50077 contacts →

Partial evidence

“Search Marketing | Content | Strategy Delivered by passionate people.”

Source: RevenueBase Database · checked Sep 24, 2026
9Indirect evidenceLondon, United KingdomHQ checked Sep 24, 202611-5077 contacts →

Indirect evidence

“At MediaVision, we believe there's potential hidden in every search.”

Source: RevenueBase Database · checked Sep 24, 2026
10Indirect evidenceBerkshire, United KingdomHQ checked Sep 24, 202611-5075 contacts →

Indirect evidence

“Century Media360 will help you measure, optimize and enhance your ROI then association with us is your ultimate destination.”

Source: RevenueBase Database · checked Sep 24, 2026
11Partial evidenceStafford, United KingdomHQ checked Sep 24, 202651-20073 contacts →

Partial evidence

“Leading Web Design Agency In the UK and US offering top-notch SEO, SEM, SMO, PPC, Web Design, and Development services worldwide.”

Source: RevenueBase Database · checked Sep 24, 2026
12Strong evidenceMiddlesbrough, United KingdomHQ checked Sep 24, 202651-20069 contacts →

Strong evidence

“Unlock exceptional business growth with Mabo - an award-winning digital marketing agency specialist in paid search, social media, search engine optimisation (SEO) and Amazon…”

Source: RevenueBase Database · checked Sep 24, 2026
13Partial evidenceBrighton, United KingdomHQ checked Sep 24, 202651-20066 contacts →

Partial evidence

“We are search experts, storytellers and strategists – trusted by ambitious brands to deliver performance and brand marketing that fuels growth.”

Source: RevenueBase Database · checked Sep 24, 2026
14Partial evidenceNorwich, United KingdomHQ checked Sep 24, 202611-5063 contacts →

Partial evidence

“PureContent is a full-service marketing agency that provides everything your business needs to create impactful, results-driven marketing campaigns.”

Source: RevenueBase Database · checked Sep 24, 2026
15Partial evidenceManchester, United KingdomHQ checked Sep 24, 2026n/a62 contacts →

Partial evidence

“We're experts in making marketing work harder for SMEs in any sector.”

Source: RevenueBase Database · checked Sep 24, 2026
16Partial evidenceLondon, United KingdomHQ checked Sep 24, 202611-5061 contacts →

Partial evidence

“kai-zn] noun continuous improvement | positive change We’re experts in organic strategy, combining digital PR, technical SEO, content, and social media to put you in front of your…”

Source: RevenueBase Database · checked Sep 24, 2026
17Partial evidenceFolkestone, United KingdomHQ checked Sep 24, 202651-20060 contacts →

Partial evidence

“Sleeping Giant Media is an award-winning digital marketing agency providing digital marketing services for businesses that wish to grow online.”

Source: RevenueBase Database · checked Sep 24, 2026
18Partial evidenceLiverpool, United KingdomHQ checked Sep 24, 202611-5060 contacts →

Partial evidence

“Welcome to icopify, your one-stop shop for digital marketing solutions.”

Source: RevenueBase Database · checked Sep 24, 2026
19Indirect evidenceLondon, United KingdomHQ checked Sep 24, 202651-20057 contacts →

Indirect evidence

“Get found online.”

Source: RevenueBase Database · checked Sep 24, 2026
20Strong evidenceNottingham, United KingdomHQ checked Sep 24, 202651-20057 contacts →

Strong evidence

“Exposure Ninja is an award-winning search marketing agency specialising in SEO, AI Search and PPC.”

Source: RevenueBase Database · checked Sep 24, 2026
21Strong evidenceHooton, United KingdomHQ checked Sep 24, 202651-20055 contacts →

Strong evidence

“Click Consult, an IQVIA business, is a multi award-winning digital and search marketing agency with a focus on organic (SEO) and paid search (PPC).”

Source: RevenueBase Database · checked Sep 24, 2026
22Partial evidenceExeter, United KingdomHQ checked Sep 24, 202651-20054 contacts →

Partial evidence

“Search4Local is a full-service digital advertising and marketing agency based in Exeter, Devon, working with businesses across the UK.”

Source: RevenueBase Database · checked Sep 24, 2026
23Indirect evidenceBournemouth, United KingdomHQ checked Sep 24, 202611-5054 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 24, 2026
24Indirect evidenceBristol, United KingdomHQ checked Sep 24, 202611-5054 contacts →

Indirect evidence

“At Conscious, we have over 20 years of experience in helping law firms become more successful online.”

Source: RevenueBase Database · checked Sep 24, 2026
25Partial evidenceLondon, United KingdomHQ checked Sep 24, 202611-5052 contacts →

Partial evidence

“SUSO Digital is an award-winning SEO and AI Search agency.”

Source: RevenueBase Database · checked Sep 24, 2026

Showing 25 of 4,342 enterprise SEO marketing companies based in the United Kingdom

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Enterprise SEO marketing companies based in the United Kingdom at a glance

As of Sep 24, 2026
21.5%Verified-email coverage
6.3%Mobile-number coverage
6.0Average contacts per company
1-10Median size (employees)
28.8%Largest-city concentration · London
Sep 24, 2026Page data refreshed

Companies by employee count

1-10
3,347
11-50
1,047
51-200
132
201-500
20
501-1,000
5
1,001-5,000
2
5,001-10,000
1

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 26.0d

Company record updated

Median 90.0d

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 enterprise SEO marketing 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 “enterprise SEO marketing 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 enterprise SEO marketing 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 enterprise SEO marketing 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, 5,591 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 24, 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.

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 enterprise SEO marketing 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 enterprise SEO marketing companies are there based in the United Kingdom?

RevenueBase identified 4,342 enterprise SEO marketing 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?

ADD People, headquartered in Altrincham, tops this list with the largest team on record.

Which city has the most enterprise SEO marketing companies?

London leads with 1251 headquartered companies, followed by Manchester (176) and Birmingham (123).

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 5,591 verified decision-maker contacts tracked across these 4,342 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 24, 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.