Company lists · Data refreshed September 2026
Top 22 In-stream video ad platforms based in the United Kingdom
RevenueBase identified 72 in-stream video ad platforms headquartered in the United Kingdom as of September 2026 and tracks 1,131 professional contacts across them, including 360 with verified work emails and 134 with mobile numbers. London is the largest hub.
This list covers in-stream video ad platforms headquartered in the 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, how directly it supports the match, and when it was last checked. Data refreshed September 3, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 22 largest in-stream video ad platforms based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 187 | ||||
“Vidsy helps global brands achieve business goals with effective video ads, created efficiently and consistently for digital.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 2 | 98 | ||||
“Admixer is an independent adtech company that develops an ecosystem of full-stack programmatic solutions.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 3 | Precise TVStrong evidence | 50 | |||
“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: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 4 | 43 | ||||
“Yospace has been at the forefront of the digital video revolution for 25 years.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 5 | ReelupStrong evidence | 19 | |||
“ReelUp is the world’s leading shoppable video platform for DTC and eCommerce brands, and the only platform powering over live shoppable videos across global brands including Dot…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 6 | 18 | ||||
“Hoopla are an independent start-up online advertising network, specialising in online video, display, mobile and branded advertising solutions.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 7 | 14 | ||||
“Welcome to bidinfluence, your premier supply-side platform specializing in the dynamic monetization of mobile applications through top-notch programmatic video ads.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 8 | 14 | ||||
“Pixels AI uses innovative tech to amplify the potential of video on the Open Web.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 9 | 11 | ||||
“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: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 10 | 10 | ||||
“We connect brands with communities across the CTV marketplace.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 11 | 9 | ||||
“LightBox TV is the first independent management solution for marketers and media buyers running addressable TV advertising campaigns in connected TV environments.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 12 | 9 | ||||
“As Smatch, We help brands reach brand new audiences on mobile games, streamers, blended networks and audio platforms.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 13 | SBSIndirect evidence | 7 | |||
“In a digital landscape dominated by complexity, scale and constant change, SBS exists to level the playing field.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 14 | 7 | ||||
“Coull is an advertising technology company that adds value to any video, for advertisers and web publishers.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 15 | 6 | ||||
“United4digital is a global marketing company specializing in video and audio advertising solutions.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 16 | 6 | ||||
“From the beginning, Open Horizons Media has been a programmatic advertising company dedicated to achieving digital advertising success for businesses of all sizes!” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 17 | OctaveIndirect evidence | 5 | |||
“Octave Audio is live!” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 18 | 5 | ||||
“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: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 19 | 5 | ||||
“SIGWICK MEDIA | A Global Programmatic Advertising Platform, buyers may use real-time bidding on direct premium inventory through SIGWICK MEDIA.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 20 | 5 | ||||
“At Adalyser, we are revolutionising the TV buying process.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 21 | VideolityPartial evidence | 5 | |||
“Videolity helps businesses to monetise their videos by auto-tagging and making them one-click shoppable.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 22 | ViewabilityIndirect evidence | 4 | |||
“Viewability is a YouTube Advertising Agency that specialises in getting real results from your campaigns.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
Showing 22 of 72 in-stream video ad platforms based in the United Kingdom
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In-stream video ad platforms based in the United Kingdom at a glance
As of Sep 3, 2026Companies by employee count
Verified emails by last verification
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 evidence 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 SmartSearch, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the 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.
- 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 United Kingdom 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 an evidence 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, 360 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 3, 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-stream video ad platforms in London50
Frequently asked
How many in-stream video ad platforms are there based in the United Kingdom?
RevenueBase identified 72 in-stream video ad platforms headquartered in the 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 360 verified decision-maker contacts tracked across these 72 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 3, 2026.
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In-stream video ad platforms by geography
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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 SmartSearch, 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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