Company lists · Data verified August 2026

Top 25 Advertising technology platforms based in London, United Kingdom

Name: Advertising technology platforms 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 368 companies tracked

There are 368 advertising technology platforms headquartered in London, United Kingdom (RevenueBase, August 2026). RevenueBase tracks 9,070 professional contacts across them, including 2,761 with verified work emails and 1,044 with mobile numbers. London is the largest hub.

This list covers advertising technology platforms 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.

368Companies

9,070Contacts tracked

2,761Verified emails

1,044Mobile numbers

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The 25 largest advertising technology platforms based in London, United Kingdom

Ranked by team size

Top 25 of 368 advertising technology platforms 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	Seedtag	London	501-1,000	725	318
2	OGURY	London	501-1,000	591	100
3	Gumgum	London	501-1,000	532	317
4	VERVE	London	501-1,000	443	180
5	Expandi Group	London	201-500	155	46
6	Vidmob	London	51-200	147	40
7	Ozone The Audience Connection Platform	London	51-200	145	109
8	I-Media	London	51-200	143	39
9	Crimtan	London	51-200	128	94
10	Seenthis	London	51-200	126	23
11	Admixer	London	201-500	98	15
12	DCMN	London	51-200	94	64
13	REVX	London	51-200	88	44
14	Sparteo	London	51-200	86	41
15	Efficient Frontier	London	201-500	85	2
16	Audienceproject	London	51-200	84	54
17	Admaxim INC	London	51-200	74	27
18	id5.io	London	51-200	72	51
19	Onetag	London	51-200	71	61
20	Nest Commerce	London	51-200	69	50
21	Airnow Media	London	201-500	68	1
22	Zitcha	London	51-200	65	54
23	Sharethrough	London	51-200	62	38
24	Adylic	London	51-200	58	25
25	Framen	London	51-200	56	3

Showing 25 of 368 advertising technology platforms based in London, United Kingdom

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Advertising technology platforms based in London, United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 368 HQs

1,044Contacts with mobile numbers

15Emails re-verified in last 30 days

Companies by employee count

1-10

138

11-50

157

51-200

201-500

501-1,000

1,001-5,000

Advertising technology platforms by metro in the United Kingdom

Metro	Companies
Advertising technology platforms in London	368
Advertising technology platforms in Manchester	15
Advertising technology platforms in Edinburgh	9
Advertising technology platforms in Birmingham	8
Advertising technology platforms in Leeds	5
Advertising technology platforms in Bath	5
Advertising technology platforms in Cardiff	5

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 “advertising technology platforms”, 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; 15 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 advertising technology platforms are there based in London, United Kingdom?

There are 368 advertising technology platforms headquartered in London, 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 advertising technology platforms?

London leads with 368 headquartered companies, followed by Manchester (15) and Edinburgh (9).

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 2,761 verified decision-maker contacts tracked across these 368 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.