Company lists · Data verified August 2026

Top 25 B2B SEO agencies based in London, United Kingdom

Name: B2B SEO agencies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 457 companies tracked

There are 457 B2B SEO agencies headquartered in London, United Kingdom (RevenueBase, August 2026). RevenueBase tracks 2,877 professional contacts across them, including 651 with verified work emails and 171 with mobile numbers. London is the largest hub.

This list covers B2B SEO agencies headquartered in London, United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

457Companies

2,877Contacts tracked

651Verified emails

171Mobile numbers

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The 25 largest B2B SEO agencies based in London, United Kingdom

Ranked by team size

Top 25 of 457 B2B SEO agencies based in London, United Kingdom, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Publicis PRO	London	51-200	140	34
2	BBN	London	1,001-5,000	85	8
3	Delante SEO SEM Agency	London	51-200	75	21
4	Propeller Group	London	51-200	71	50
5	Reboot	London	51-200	59	31
6	Click Consult Part Of Ceuta Group	London	51-200	55	20
7	The Marketing Practice	London	501-1,000	52	30
8	JBH	London	11-50	46	10
9	The Think Tank	London	11-50	45	25
10	Distinctly	London	11-50	40	29
11	Lion Reach Media	London	51-200	28	9
12	Sage Marketing	London	11-50	26	10
13	Wonderful	London	11-50	26	5
14	Vime Digital	London	11-50	25	6
15	Digitviral	London	51-200	24	2
16	Alan. Agency	London	51-200	22	16
17	Chameleon WEB Services	London	51-200	22	5
18	Pearl Lemon	London	51-200	22	3
19	RE Signal	London	11-50	20	13
20	Seoskit	London	11-50	18	1
21	Adds Corporation	London	51-200	16	1
22	Kingpin Communications	London	51-200	16	1
23	Mickey Llew	London	11-50	15	6
24	ESA Digital LTD	London	11-50	13	3
25	Reposition Group	London	51-200	11	2

Showing 25 of 457 B2B SEO agencies based in London, United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 651 reachable decision-makers.

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B2B SEO agencies based in London, United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 457 HQs

171Contacts with mobile numbers

5Emails re-verified in last 30 days

Companies by employee count

1-10

296

11-50

132

51-200

501-1,000

1,001-5,000

B2B SEO agencies by metro in the United Kingdom

Metro	Companies
B2B SEO agencies in London	457
B2B SEO agencies in Manchester	76
B2B SEO agencies in Birmingham	50
B2B SEO agencies in Leeds	32
B2B SEO agencies in Liverpool	26
B2B SEO agencies in Brighton	26
B2B SEO agencies in Glasgow	25

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “B2B SEO agencies”, with match quality audited by blind human judging, and headquartered in London, United Kingdom.
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: Contact records re-verify on a rolling cadence; 5 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many B2B SEO agencies are there based in London, United Kingdom?

There are 457 B2B SEO agencies headquartered in London, United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Publicis PRO, headquartered in London, tops this list with the largest team on record.

Which city has the most B2B SEO agencies?

London leads with 457 headquartered companies, followed by Manchester (76) and Birmingham (50).

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 651 verified decision-maker contacts tracked across these 457 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.