Company lists · Data verified August 2026

Top 25 Contextual advertising platforms based in the United Kingdom

Name: Contextual advertising platforms based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 359 companies tracked

There are 359 contextual advertising platforms headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 5,709 professional contacts across them, including 2,110 with verified work emails and 697 with mobile numbers. London is the largest hub.

This list covers contextual advertising platforms headquartered in the 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.

359Companies

5,709Contacts tracked

2,110Verified emails

697Mobile numbers

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The 25 largest contextual advertising platforms based in the United Kingdom

Ranked by team size

Top 25 of 359 contextual advertising platforms based in the 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	Seedtag	London	501-1,000	725	318
2	Gumgum	London	501-1,000	532	317
3	VERVE	London	501-1,000	443	180
4	EZOIC	Newcastle Upon Tyne	201-500	203	70
5	Expandi Group	London	201-500	155	46
6	Ozone The Audience Connection Platform	London	51-200	145	109
7	Admixer	London	201-500	98	15
8	REVX	London	51-200	88	44
9	Sparteo	London	51-200	86	41
10	Efficient Frontier	London	201-500	85	2
11	Alfaleads Network	Doncaster	51-200	84	10
12	S4 Capital Group	n/a	5,001-10,000	74	27
13	Admaxim INC	London	51-200	74	27
14	Onetag	London	51-200	71	61
15	Nest Commerce	London	51-200	69	50
16	Airnow Media	London	201-500	68	1
17	Sharethrough	London	51-200	62	38
18	Multilocal	London	51-200	57	38
19	OCM Digital Media	London	51-200	54	38
20	Publisher Collective	Bath	51-200	46	37
21	Skyrise	Manchester	11-50	44	31
22	Cake Getcake.com	London	51-200	44	12
23	Adconion Media Group	London	501-1,000	39	1
24	Aitarget Tech	London	51-200	33	10
25	Illuma	London	11-50	32	24

Showing 25 of 359 contextual advertising platforms based in the United Kingdom

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Contextual advertising platforms based in the United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 221 HQs

697Contacts with mobile numbers

4Emails re-verified in last 30 days

Companies by employee count

1-10

175

11-50

131

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Contextual advertising platforms by metro

Metro	Companies
Contextual advertising platforms in London	221
Contextual advertising platforms in Manchester	10
Contextual advertising platforms in Edinburgh	6
Contextual advertising platforms in Birmingham	5
Contextual advertising platforms in Nottingham	5
Contextual advertising platforms in Leeds	4
Contextual advertising platforms in Belfast	3

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 “contextual advertising platforms”, with match quality audited by blind human judging, and headquartered in the 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; 4 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 contextual advertising platforms are there based in the United Kingdom?

There are 359 contextual advertising platforms headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

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

Which city has the most contextual advertising platforms?

London leads with 221 headquartered companies, followed by Manchester (10) and Edinburgh (6).

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 2,110 verified decision-maker contacts tracked across these 359 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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Contextual advertising platforms by geography

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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.