Company lists · Data refreshed September 2026

Top 24 In-stream video ad platforms based in London, United Kingdom

Name: In-stream video ad platforms based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 12, 2026 51 companies tracked

RevenueBase identified 51 in-stream video ad platforms headquartered in London, United Kingdom as of September 2026 and tracks 782 professional contacts across them, including 298 with verified work emails and 88 with mobile numbers. London is the largest hub.

This list covers in-stream 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 12, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 12, 2026 86% judged on-target in blind review

51Companies

782Contacts tracked

298Verified emails

88Mobile numbers

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The 24 largest in-stream video ad platforms based in London, United Kingdom

Ranked by team size

Top 24 of 51 in-stream video ad platforms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 12, 2026. RevenueBase Smart Search rates how each company's information relates to in-stream video ad platforms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	VIDSY	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	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 12, 2026
2	Venatus	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	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 12, 2026
3	Admixer	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	201-500	99 contacts →
	Indirect evidence “Admixer is an independent adtech company that develops an ecosystem of full-stack programmatic solutions.” Source: RevenueBase Database · checked Sep 12, 2026
4	Precise TV	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	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 12, 2026
5	Unruly	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	501-1,000	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 12, 2026
6	Hoopla Digital LTD	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	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 12, 2026
7	Bidinfluence	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	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 12, 2026
8	Pixels	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	13 contacts →
	Partial evidence “Pixels AI uses innovative tech to amplify the potential of video on the Open Web.” Source: RevenueBase Database · checked Sep 12, 2026
9	Smartzer	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	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 12, 2026
10	Media16	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	11 contacts →
	Indirect evidence “We connect brands with communities across the CTV marketplace.” Source: RevenueBase Database · checked Sep 12, 2026
11	Smatch	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	9 contacts →
	Strong evidence “As Smatch, We help brands reach brand new audiences on mobile games, streamers, blended networks and audio platforms.” Source: RevenueBase Database · checked Sep 12, 2026
12	Lightbox TV	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	8 contacts →
	Indirect evidence “LightBox TV is the first independent management solution for marketers and media buyers running addressable TV advertising campaigns in connected TV environments.” Source: RevenueBase Database · checked Sep 12, 2026
13	Adbreak	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	8 contacts →
	Indirect evidence “The vision of this organization is to continuously innovate and improve the field of digital advertising by focusing on the research and development of tools used to optimize the…” Source: RevenueBase Database · checked Sep 12, 2026
14	SBS	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	8 contacts →
	Indirect evidence “Programmatic was built to make media smarter.” Source: RevenueBase Database · checked Sep 12, 2026
15	United4digital	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	6 contacts →
	Partial evidence “United4digital is a global marketing company specializing in video and audio advertising solutions.” Source: RevenueBase Database · checked Sep 12, 2026
16	Open Horizons Media	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	6 contacts →
	Indirect evidence “From the beginning, Open Horizons Media has been a programmatic advertising company dedicated to achieving digital advertising success for businesses of all sizes!” Source: RevenueBase Database · checked Sep 12, 2026
17	Spiceads	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	6 contacts →
	Strong evidence “We Make Your Creativity Move Faster & Reach Further Uncover valuable insights for your video Ads with AI and continuously refine your ad campaigns & brand positioning- Insights &…” Source: RevenueBase Database · checked Sep 12, 2026
18	Octave	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	5 contacts →
	Indirect evidence “Octave Audio is live!” Source: RevenueBase Database · checked Sep 12, 2026
19	Bedrock Platform	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	5 contacts →
	Strong evidence “Bedrock Platform helps brings forward your competitive advantage with a next generation media buying platform that unifies curated quality and intelligence with high impact Video…” Source: RevenueBase Database · checked Sep 12, 2026
20	Videolity	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	5 contacts →
	Partial evidence “Videolity helps businesses to monetise their videos by auto-tagging and making them one-click shoppable.” Source: RevenueBase Database · checked Sep 12, 2026
21	Vidium	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	3 contacts →
	Strong evidence “The Vidium Video Intelligence platform is powered by deterministic video execution signals to help brands deliver the best viewing experiences for their ads across OLV and CTV.” Source: RevenueBase Database · checked Sep 12, 2026
22	Adnuro	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	2 contacts →
	Indirect evidence “Adnuro is an online advertising company with access to over 10bn GEO targeted ads per month, working with premium publishers and advertisers, delivering highly relevant, targeted…” Source: RevenueBase Database · checked Sep 12, 2026
23	Conjre LTD	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	2 contacts →
	Partial evidence “CONJRE makes creative video assets, assembled in real time at point of delivery, in response to data, for maximum relevance & effectiveness for advertisers on social, retail &…” Source: RevenueBase Database · checked Sep 12, 2026
24	Inadvia	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	2 contacts →
	Strong evidence “Inadvia is the world’s first technology platform built specifically for the programmatic trading of In-Transit video advertising.” Source: RevenueBase Database · checked Sep 12, 2026

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: in-stream 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 in-stream video ad platforms.
Partial evidence: Its own public description names part of in-stream 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 in-stream 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 24 of 51 in-stream video ad platforms based in London, United Kingdom

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In-stream video ad platforms based in London, United Kingdom at a glance

As of Sep 12, 2026

38.1%Verified-email coverage

11.3%Mobile-number coverage

15.3Average contacts per company

11-50Median size (employees)

98.0%Largest-city concentration · London

Sep 12, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 14.0d

2420–30

5331–60

261–90

090–180

1180+

Company record updated

Median 62.5d

00–30

36931–60

30061–90

7590–180

38180+

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 in-stream 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 “in-stream 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 in-stream 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 in-stream 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, 298 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 12, 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.

In-stream video ad platforms by metro in the United Kingdom

In-stream video ad platforms in London50

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 in-stream 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 in-stream video ad platforms are there based in London, United Kingdom?

RevenueBase identified 51 in-stream 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 has the most in-stream video ad platforms?

London leads with 50 headquartered companies, followed by Manchester (3) and Bristol (2).

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 298 verified decision-maker contacts tracked across these 51 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 12, 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.