Company lists · Data verified August 2026

Top 25 Ad tech software companies based in the United Kingdom

Name: Ad tech software companies 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 387 companies tracked

There are 387 ad tech software companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 8,363 professional contacts across them, including 2,491 with verified work emails and 965 with mobile numbers. London is the largest hub.

This list covers ad tech software companies 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.

387Companies

8,363Contacts tracked

2,491Verified emails

965Mobile numbers

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The 25 largest ad tech software companies based in the United Kingdom

Ranked by team size

Top 25 of 387 ad tech software companies 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	EZOIC	Newcastle Upon Tyne	201-500	203	70
6	Expandi Group	London	201-500	155	46
7	Vidmob	London	51-200	147	40
8	Ozone The Audience Connection Platform	London	51-200	145	109
9	Crimtan	London	51-200	128	94
10	Admixer	London	201-500	98	15
11	REVX	London	51-200	88	44
12	Sparteo	London	51-200	86	41
13	Efficient Frontier	London	201-500	85	2
14	Audienceproject	London	51-200	84	54
15	S4 Capital Group	n/a	5,001-10,000	74	27
16	Admaxim INC	London	51-200	74	27
17	id5.io	London	51-200	72	51
18	Onetag	London	51-200	71	61
19	Nest Commerce	London	51-200	69	50
20	Airnow Media	London	201-500	68	1
21	Sharethrough	London	51-200	62	38
22	Multilocal	London	51-200	57	38
23	59a	London	51-200	55	31
24	OCM Digital Media	London	51-200	54	38
25	Publisher Collective	Bath	51-200	46	37

Showing 25 of 387 ad tech software companies based in the United Kingdom

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Ad tech software companies based in the United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 256 HQs

965Contacts with mobile numbers

19Emails re-verified in last 30 days

Companies by employee count

1-10

164

11-50

155

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Ad tech software companies by metro

Metro	Companies
Ad tech software companies in London	256
Ad tech software companies in Manchester	10
Ad tech software companies in Edinburgh	8
Ad tech software companies in Birmingham	7
Ad tech software companies in Leeds	4
Ad tech software companies in Bath	3
Ad tech software companies in Guildford	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 “ad tech software companies”, 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 software companies are there based in the United Kingdom?

There are 387 ad tech software companies 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 software companies?

London leads with 256 headquartered companies, followed by Manchester (10) and Edinburgh (8).

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 2,491 verified decision-maker contacts tracked across these 387 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.