Company lists · Data verified August 2026

Top 25 Ad tech platforms based in the United Kingdom

Name: Ad tech 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 471 companies tracked

There are 471 ad tech platforms headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 8,138 professional contacts across them, including 3,071 with verified work emails and 1,157 with mobile numbers. London is the largest hub.

This list covers ad tech 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.

471Companies

8,138Contacts tracked

3,071Verified emails

1,157Mobile numbers

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The 25 largest ad tech platforms based in the United Kingdom

Ranked by team size

Top 25 of 471 ad tech 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	OGURY	London	501-1,000	591	100
2	Gumgum	London	501-1,000	532	317
3	VERVE	London	501-1,000	443	180
4	Loopme	Manchester	201-500	401	237
5	Partnerize	Newcastle Upon Tyne	201-500	335	223
6	EZOIC	Newcastle Upon Tyne	201-500	203	70
7	Expandi Group	London	201-500	155	46
8	Ozone The Audience Connection Platform	London	51-200	145	109
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	S4 Capital Group	n/a	5,001-10,000	74	27
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	LUNIO	Chorley	51-200	64	40
23	Sharethrough	London	51-200	62	38
24	Multilocal	London	51-200	57	38
25	OCM Digital Media	London	51-200	54	38

Showing 25 of 471 ad tech platforms based in the United Kingdom

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Ad tech platforms based in the United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 327 HQs

1,157Contacts with mobile numbers

19Emails re-verified in last 30 days

Companies by employee count

1-10

185

11-50

210

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Ad tech platforms by metro

Metro	Companies
Ad tech platforms in London	327
Ad tech platforms in Manchester	12
Ad tech platforms in Edinburgh	9
Ad tech platforms in Birmingham	7
Ad tech platforms in Bath	5
Ad tech platforms in Leeds	5
Ad tech platforms in London London	4

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 “ad tech 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; 19 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 ad tech platforms are there based in the United Kingdom?

There are 471 ad tech platforms headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

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

Which city has the most ad tech platforms?

London leads with 327 headquartered companies, followed by Manchester (12) 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 3,071 verified decision-maker contacts tracked across these 471 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.