Company lists · Data refreshed September 2026
Top 25 Over-the-top video ad platforms based in London, United Kingdom
RevenueBase identified 105 over-the-top video ad platforms headquartered in London, United Kingdom as of September 2026 and tracks 1,306 professional contacts across them, including 479 with verified work emails. Across the United Kingdom, London is the largest hub for this category.
This list covers over-the-top video ad platforms 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 September 29, 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 over-the-top video ad platforms based in London, United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 192 contacts → | ||||
Partial evidence “Vidsy helps global brands achieve business goals with effective video ads, created efficiently and consistently for digital.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 2 | 107 contacts → | ||||
Indirect evidence “Venatus Media is the advertising growth engine where premium games, sports, and entertainment content thrive, and brands meet audiences In the Zone.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 3 | 99 contacts → | ||||
Indirect evidence “Admixer is an independent adtech company that develops an ecosystem of full-stack programmatic solutions.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 4 | 58 contacts → | ||||
Indirect evidence “Your partner in OTT.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 5 | 54 contacts → | ||||
Partial evidence “OCM is a leading adtech agency providing solutions to advertisers, advertising agencies and to web, mobile & video publishers.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 6 | 49 contacts → | ||||
Strong evidence “Precise TV is an award-winning HIPAA and COPPA certified contextual video advertising platform offering advanced machine-learning optimization and contextual targeting helping you…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 7 | 44 contacts → | ||||
Partial evidence “Peach is working to radically simplify ad workflows.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 8 | 39 contacts → | ||||
Indirect evidence “Nexxen empowers advertisers, agencies, publishers and broadcasters around the world to utilize data and advanced TV in the ways that are most meaningful to them.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 9 | 39 contacts → | ||||
Partial evidence “AMG is a technology company who has built one of the largest global multi-screen, multi-channel audience platforms.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 10 | 38 contacts → | ||||
Partial evidence “Our platform helps performance marketers scale social, display and retail media campaigns.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 11 | 24 contacts → | ||||
Partial evidence “Adludio is an award-winning, AI-powered platform that delivers brand outcomes through interactive mobile advertising.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 12 | 22 contacts → | ||||
Indirect evidence “Broadlab provides a single point of access to the whole of the Addressable TV advertising landscape for agencies and their clients.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 13 | 18 contacts → | ||||
Partial evidence “Hoopla are an independent start-up online advertising network, specialising in online video, display, mobile and branded advertising solutions.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 14 | 17 contacts → | ||||
Indirect evidence “Created by GroupM in 2017, Finecast, now part of GroupM Nexus (GroupM's leading global performance group), is the group's leading addressable TV company which enables advertisers…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 15 | 17 contacts → | ||||
Indirect evidence “Supponor is an innovative sports media and technology company whose virtual advertising technology is revolutionizing TV-visible advertising in live sports.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 16 | 16 contacts → | ||||
Indirect evidence “Audience2Media is an Advertising Technology based company with offices in the UK and Asia, delivering data driven campaigns across all media channels, applying an innovative…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 17 | 16 contacts → | ||||
Indirect evidence “Massive is now Deltatre.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 18 | 14 contacts → | ||||
Strong evidence “Welcome to bidinfluence, your premier supply-side platform specializing in the dynamic monetization of mobile applications through top-notch programmatic video ads.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 19 | 13 contacts → | ||||
Partial evidence “Pixels AI uses innovative tech to amplify the potential of video on the Open Web.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 20 | 12 contacts → | ||||
Strong evidence “Smartzer is a SaaS platform used by brands to make live streams and videos interactive and shoppable to drive sales and capture detailed analytics directly from their videos.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 21 | 11 contacts → | ||||
Indirect evidence “We connect brands with communities across the CTV marketplace.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 22 | 11 contacts → | ||||
Indirect evidence “We are the new media experts.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 23 | 10 contacts → | ||||
Partial evidence “VideoWeek covers the video & CTV advertising market in Europe via the online trade publication, a podcast series and online video.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 24 | 9 contacts → | ||||
Indirect evidence “Admongrel is an end-to-end service provider for the fast-growing Connected TV Industry CREATE Concept development and creation of hybrid services that engage audiences and also…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 25 | 8 contacts → | ||||
Strong evidence “Vodlix is a white-label video streaming and OTT (Over-The-Top) platform that offers cloud-based solutions for IPTV and VOD (Video-On-Demand) needs.” Source: RevenueBase Database · checked Sep 29, 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: over-the-top video ad platforms. 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 over-the-top video ad platforms.
- Partial evidence
- Its own public description names part of over-the-top video ad platforms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name over-the-top video ad platforms. 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 105 over-the-top video ad platforms based in London, United Kingdom
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Over-the-top video ad platforms based in London, United Kingdom at a glance
As of Sep 29, 2026Companies by employee count
Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 105 companies.
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 over-the-top video ad platforms, 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 “over-the-top video ad platforms”. 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 over-the-top video ad platforms), 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 over-the-top video ad platforms, 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, 479 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 September 29, 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.
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 over-the-top video ad platforms, 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 over-the-top video ad platforms are there based in London, United Kingdom?
RevenueBase identified 105 over-the-top video ad platforms headquartered in London, United Kingdom as of September 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?
VIDSY, headquartered in London, tops this list with the largest team on record.
Which city in the United Kingdom has the most over-the-top video ad platforms?
London leads the United Kingdom with 105 headquartered companies, followed by Birmingham (5) and Manchester (4).
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 479 verified decision-maker contacts tracked across these 105 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 29, 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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