Company lists · Data verified August 2026

Top 25 Advertising technology platforms based in the United Kingdom

Name: Advertising technology 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 536 companies tracked

There are 536 advertising technology platforms headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 11,593 professional contacts across them, including 3,707 with verified work emails and 1,417 with mobile numbers. London is the largest hub.

This list covers advertising technology 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.

536Companies

11,593Contacts tracked

3,707Verified emails

1,417Mobile numbers

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The 25 largest advertising technology platforms based in the United Kingdom

Ranked by team size

Top 25 of 536 advertising technology 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	OGURY	London	501-1,000	591	100
3	Gumgum	London	501-1,000	532	317
4	VERVE	London	501-1,000	443	180
5	Loopme	Manchester	201-500	401	237
6	Partnerize	Newcastle Upon Tyne	201-500	335	223
7	EZOIC	Newcastle Upon Tyne	201-500	203	70
8	Expandi Group	London	201-500	155	46
9	Vidmob	London	51-200	147	40
10	Ozone The Audience Connection Platform	London	51-200	145	109
11	I-Media	London	51-200	143	39
12	Crimtan	London	51-200	128	94
13	Seenthis	London	51-200	126	23
14	Admixer	London	201-500	98	15
15	DCMN	London	51-200	94	64
16	Ajatus	Milton Keynes	51-200	93	3
17	REVX	London	51-200	88	44
18	Sparteo	London	51-200	86	41
19	Efficient Frontier	London	201-500	85	2
20	Audienceproject	London	51-200	84	54
21	S4 Capital Group	n/a	5,001-10,000	74	27
22	Admaxim INC	London	51-200	74	27
23	id5.io	London	51-200	72	51
24	Onetag	London	51-200	71	61
25	Nest Commerce	London	51-200	69	50

Showing 25 of 536 advertising technology platforms based in the United Kingdom

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Advertising technology platforms based in the United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 368 HQs

1,417Contacts with mobile numbers

20Emails re-verified in last 30 days

Companies by employee count

1-10

213

11-50

228

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Advertising technology platforms by metro

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 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; 20 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 the United Kingdom?

There are 536 advertising technology 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 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 3,707 verified decision-maker contacts tracked across these 536 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.