Company lists · Data refreshed September 2026

Top 25 International SEO agencies based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 749 companies tracked

RevenueBase identified 749 international SEO agencies headquartered in the United Kingdom as of September 2026 and tracks 5,208 professional contacts across them, including 862 with verified work emails and 266 with mobile numbers. London is the largest hub.

This list covers international SEO agencies 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 4, 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 HQ checked on every row Match evidence on every row Refreshed Sep 4, 2026 86% judged on-target in blind review

749Companies

5,208Contacts tracked

862Verified emails

266Mobile numbers

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The 25 largest international SEO agencies based in the United Kingdom

Ranked by team size

Top 25 of 749 international SEO agencies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 4, 2026. Evidence rates how directly each company's own description names international SEO agencies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	Ics-DigitalPartial evidence	Leeds, United KingdomHQ checked Sep 4, 2026	51-200	165
	“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: company website · checked Sep 4, 2026
2	MediavisionIndirect evidence	London, United KingdomHQ checked Sep 4, 2026	11-50	78
	“At MediaVision, we believe there's potential hidden in every search.” Source: company website · checked Sep 4, 2026
3	KnotsyncPartial evidence	Stafford, United KingdomHQ checked Sep 4, 2026	51-200	73
	“Leading Web Design Agency In the UK and US offering top-notch SEO, SEM, SMO, PPC, Web Design, and Development services worldwide.” Source: company website · checked Sep 4, 2026
4	Oban InternationalIndirect evidence	United KingdomHQ checked Sep 4, 2026	11-50	66
	“A lot of digital marketing falls flat when you take it abroad.” Source: company website · checked Sep 4, 2026
5	Click Consult Part Of Ceuta GroupPartial evidence	Hooton, United KingdomHQ checked Sep 4, 2026	51-200	55
	“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: company website · checked Sep 4, 2026
6	Seedhub MediaIndirect evidence	Brighton, United KingdomHQ checked Sep 4, 2026	11-50	50
	Source: company website · checked Sep 4, 2026
7	Screaming FrogIndirect evidence	Henley-On-Thames, United KingdomHQ checked Sep 4, 2026	11-50	48
	“Screaming Frog is a search marketing agency drawing on years of experience from within the world of digital marketing.” Source: company website · checked Sep 4, 2026
8	ADAPTIndirect evidence	London, United KingdomHQ checked Sep 4, 2026	51-200	48
	“Adapt helps global brands deliver campaigns that convert, by blending data-driven growth strategies with localisation expertise.” Source: company website · checked Sep 4, 2026
9	Sherbet DonkeyPartial evidence	Bromsgrove, United KingdomHQ checked Sep 4, 2026	11-50	46
	“Sherbet Donkey is an SEO agency built for businesses that want sustainable, long-term growth from organic search.” Source: company website · checked Sep 4, 2026
10	JBHPartial evidence	Manchester, United KingdomHQ checked Sep 4, 2026	11-50	46
	“JBH is a performance-driven digital PR and SEO agency with offices in Manchester and London, working with consumer brands all over the world to support them with their organic…” Source: company website · checked Sep 4, 2026
11	Atlas SEOIndirect evidence	Norwich, United KingdomHQ checked Sep 4, 2026	11-50	44
	“Every business has one thing in common, the drive to succeed.” Source: company website · checked Sep 4, 2026
12	DistinctlyPartial evidence	London, United KingdomHQ checked Sep 4, 2026	11-50	40
	“Distinctly is an independent digital marketing agency with a passion for SEO, paid media, digital PR and content.” Source: company website · checked Sep 4, 2026
13	Atomic Digital MarketingPartial evidence	Warrington, United KingdomHQ checked Sep 4, 2026	11-50	33
	“Atomic is a Digital Marketing Agency based in Cheshire and Hampshire, specialising in PPC, SEO & Web Design.” Source: company website · checked Sep 4, 2026
14	OCEREPartial evidence	Cheltenham, United KingdomHQ checked Sep 4, 2026	51-200	32
	“SEO, PPC, Outreach & Lead Generation.” Source: company website · checked Sep 4, 2026
15	Salience Human-First Search MarketingIndirect evidence	Chester, United KingdomHQ checked Sep 4, 2026	11-50	28
	“We’ve been search marketers since 2009.” Source: company website · checked Sep 4, 2026
16	MNA DigitalIndirect evidence	Wolverhampton, United KingdomHQ checked Sep 4, 2026	11-50	25
	“Here at MNA Digital, we are a cutting-edge digital marketing agency based in Wolverhampton.” Source: company website · checked Sep 4, 2026
17	HonchōIndirect evidence	Hertford, United KingdomHQ checked Sep 4, 2026	11-50	24
	“Established in 2008, Honchō are a multi-award winning, search marketing agency that supports brands across the UK, US and Europe.” Source: company website · checked Sep 4, 2026
18	Varn Search MarketingPartial evidence	Bradford On Avon, United KingdomHQ checked Sep 4, 2026	11-50	24
	“Varn is a specialist search marketing consultancy, applying our expertise in SEO, GEO, data, content strategy and digital PR, to accelerate profitable organic growth for our happy…” Source: company website · checked Sep 4, 2026
19	WebcertainIndirect evidence	York, United KingdomHQ checked Sep 4, 2026	51-200	24
	“Digital marketing for global brands.” Source: company website · checked Sep 4, 2026
20	GO UPPartial evidence	London, United KingdomHQ checked Sep 4, 2026	11-50	22
	“Go Up is a leading international search marketing and digital design agency based in London, UK and Los Angeles, USA.” Source: company website · checked Sep 4, 2026
21	Activewin MarketingIndirect evidence	Manchester, United KingdomHQ checked Sep 4, 2026	51-200	22
	“Welcome to ActiveWin, where digital marketing mastery meets innovative solutions.” Source: company website · checked Sep 4, 2026
22	Pearl LemonPartial evidence	London, United KingdomHQ checked Sep 4, 2026	51-200	22
	“We are a globally remote team connected by cloud technology and a passion for all things SEO.” Source: company website · checked Sep 4, 2026
23	SEO For HirePartial evidence	Manchester, United KingdomHQ checked Sep 4, 2026	11-50	21
	“We empower progressive, ambitious companies who wish to hire the best SEO talent worldwide to optimise efficiency, profitability and performance.” Source: company website · checked Sep 4, 2026
24	Novus DigitalIndirect evidence	Kettering, United KingdomHQ checked Sep 4, 2026	11-50	21
	“Are you tired of watching your competitors run rings around you?” Source: company website · checked Sep 4, 2026
25	RE SignalPartial evidence	London, United KingdomHQ checked Sep 4, 2026	11-50	20
	“Re:signal is a specialist ecommerce SEO and Digital PR agency focused on driving measurable growth.” Source: company website · checked Sep 4, 2026

Showing 25 of 749 international SEO agencies based in the United Kingdom

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International SEO agencies based in the United Kingdom at a glance

As of Sep 4, 2026

1-10Median size (employees)

LondonLargest hub · 213 HQs

266Contacts with mobile numbers

Sep 4, 2026Data refreshed

Companies by employee count

1-10

539

11-50

170

51-200

201-500

Verified emails by last verification

0–30

31–60

61–90

451

90–180

336

180+

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 international SEO agencies, 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 “international SEO agencies”. 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 international SEO agencies, 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, 862 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 4, 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.

International SEO agencies by metro

International SEO agencies in London213
International SEO agencies in Manchester33

Frequently asked

How many international SEO agencies are there based in the United Kingdom?

RevenueBase identified 749 international SEO agencies 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?

Ics-Digital, headquartered in Leeds, tops this list with the largest team on record.

Which city has the most international SEO agencies?

London leads with 213 headquartered companies, followed by Manchester (33) and Birmingham (19).

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 862 verified decision-maker contacts tracked across these 749 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 4, 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.