Company lists · Data refreshed August 2026
Top 25 Ad tech software companies based in London, United Kingdom
RevenueBase identified 256 ad tech software companies headquartered in London, United Kingdom as of August 2026 and 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. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed August 30, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest ad tech software companies based in London, United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 591 contacts → | ||||
Indirect evidence “Ogury is a global adtech company powered by Persona Intelligence, its proprietary technology that enables brands and agencies to activate consistent persona-based strategies…” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 2 | 532 contacts → | ||||
Indirect evidence “GumGum is The Mindset Company™ transforming advertising.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 3 | 443 contacts → | ||||
Partial evidence “Verve is a global leading advertising technology company, connecting advertisers seeking to buy digital ad space with publishers monetizing their content.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 4 | 155 contacts → | ||||
Indirect evidence “Expandi Group is a global leader in AdTech, MarTech and Managed Services.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 5 | 147 contacts → | ||||
Indirect evidence “Vidmob is the creative data company.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 6 | 145 contacts → | ||||
Indirect evidence “Ozone is a digital advertising business with a difference.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 7 | 128 contacts → | ||||
Indirect evidence “Crimtan was established in 2009 with a clear mission: to be a trusted partner for brands navigating the complex world of programmatic advertising.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 8 | 98 contacts → | ||||
Indirect evidence “Admixer is an independent adtech company that develops an ecosystem of full-stack programmatic solutions.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 9 | 88 contacts → | ||||
Partial evidence “SCAM-ALERT: we do not employ freelancers for ad testing or similar, and we will not ask anyone to deposit private funds for such work!” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 10 | 86 contacts → | ||||
Indirect evidence “We help media and content companies monetize their audiences across the web, mobile, CTV, and beyond.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 11 | 85 contacts → | ||||
Indirect evidence “Maximum advertising performance and returns.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 12 | 84 contacts → | ||||
Indirect evidence “AudienceProject is a Danish-founded SaaS company empowering advertisers to make confident marketing decisions and reach their audience more effectively based on independent…” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 13 | 74 contacts → | ||||
Indirect evidence “Consumer use of mobile devices is changing the advertising landscape drastically and rapidly.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 14 | 72 contacts → | ||||
Indirect evidence “ID5 is redefining identity for digital advertising, building solutions where privacy and addressability work in sync.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 15 | 71 contacts → | ||||
Indirect evidence “Founded in 2015, Onetag is the next-generation value exchange for the open internet, combining quality media and AI-driven decisioning to deliver measurable business outcomes at…” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 16 | 69 contacts → | ||||
Indirect evidence “Nest Commerce is a technology-led agency working with brands like Urban Outfitters, Hims and Damson Madder.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 17 | 68 contacts → | ||||
Indirect evidence “We provide the most advanced targeting and optimization technology on the market, bringing unrivalled monetization solutions to advertisers and app publishers alike.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 18 | 62 contacts → | ||||
Partial evidence “Sharethrough merged with District M in February 2021 to form what is now one of the leading independent global ad exchanges, connecting publishers and advertisers with true…” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 19 | 57 contacts → | ||||
Indirect evidence “At Multilocal, we believe advertising can be better - more intelligent, more efficient and more transparent.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 20 | 55 contacts → | ||||
Indirect evidence “59A is a technology business built to engineer opportunity within the ever increasing complexity of media strategy, planning, and buying.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 21 | 54 contacts → | ||||
Indirect evidence “OCM is a leading adtech agency providing solutions to advertisers, advertising agencies and to web, mobile & video publishers.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 22 | 46 contacts → | ||||
Partial evidence “Peach is working to radically simplify ad workflows.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 23 | 39 contacts → | ||||
Indirect evidence “AMG is a technology company who has built one of the largest global multi-screen, multi-channel audience platforms.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 24 | 38 contacts → | ||||
Strong evidence “We're an ad-tech company, serving the £23bn global market for audio advertising with software-as-a-service solutions for revenue optimisation, planning and scheduling.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 25 | 33 contacts → | ||||
Partial evidence “Aitarget Tech is a paid social platform for dynamic ads and personalized videos at scale.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: ad tech software companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names ad tech software companies.
- Partial evidence
- Its own public description names part of ad tech software companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name ad tech software companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
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 30, 2026Companies by employee count
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among ad tech software companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in London, United Kingdom whose own description of what they do matches “ad tech software companies”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names ad tech software companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among ad tech software companies, and records with no verified work email. Companies headquartered outside London are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- 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
- Every listed company carries at least one verified work email, 1,901 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on August 30, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Ad tech software companies by metro in the United Kingdom
- Ad tech software companies in London256
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names ad tech software companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many ad tech software companies are there based in London, United Kingdom?
RevenueBase identified 256 ad tech software companies headquartered in London, United Kingdom as of August 2026, matched on each company's own description of what it does rather than its industry code.
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 refreshes periodically as the company graph is re-checked. This page's figures were pulled on August 30, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 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 with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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