Company lists · Data verified August 2026

Top 25 Ad tech software companies based in London, United Kingdom

Name: Ad tech software companies 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 256 companies tracked

There are 256 ad tech software companies headquartered in London, United Kingdom (RevenueBase, August 2026). RevenueBase tracks 6,771 professional contacts across them, including 1,901 with verified work emails and 763 with mobile numbers. London is the largest hub.

This list covers ad tech software companies 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.

256Companies

6,771Contacts tracked

1,901Verified emails

763Mobile numbers

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The 25 largest ad tech software companies based in London, United Kingdom

Ranked by team size

Top 25 of 256 ad tech software companies 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	OGURY	London	501-1,000	591	100
2	Gumgum	London	501-1,000	532	317
3	VERVE	London	501-1,000	443	180
4	Expandi Group	London	201-500	155	46
5	Vidmob	London	51-200	147	40
6	Ozone The Audience Connection Platform	London	51-200	145	109
7	Crimtan	London	51-200	128	94
8	Admixer	London	201-500	98	15
9	REVX	London	51-200	88	44
10	Sparteo	London	51-200	86	41
11	Efficient Frontier	London	201-500	85	2
12	Audienceproject	London	51-200	84	54
13	Admaxim INC	London	51-200	74	27
14	id5.io	London	51-200	72	51
15	Onetag	London	51-200	71	61
16	Nest Commerce	London	51-200	69	50
17	Airnow Media	London	201-500	68	1
18	Sharethrough	London	51-200	62	38
19	Multilocal	London	51-200	57	38
20	59a	London	51-200	55	31
21	OCM Digital Media	London	51-200	54	38
22	PEACH	London	201-500	46	22
23	Adconion Media Group	London	501-1,000	39	1
24	Adserve	London	11-50	38	5
25	Aitarget Tech	London	51-200	33	10

Showing 25 of 256 ad tech software companies based in London, United Kingdom

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Ad tech software companies based in London, United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 256 HQs

763Contacts with mobile numbers

15Emails re-verified in last 30 days

Companies by employee count

1-10

100

11-50

105

51-200

201-500

501-1,000

1,001-5,000

Ad tech software companies by metro in the United Kingdom

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 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 ad tech software companies are there based in London, United Kingdom?

There are 256 ad tech software companies headquartered in London, 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 1,901 verified decision-maker contacts tracked across these 256 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.