OOH Advertising Companies in London: 178 Active Firms (2026)
OOH advertising companies sell, plan and manage billboard, transit and public-space media for advertisers across London.
Buying centres tend to split between media owners controlling street-furniture, transport, retail and venue inventory; specialist agencies planning and buying across those estates; and operators managing landlord relationships, installation, proof-of-posting and campaign reporting. The customer base is mainly B2B: media agencies, direct advertisers, property owners, transport venues and public-space landlords, with sales cycles shaped by site availability, audience fit and consent constraints. Engagements are usually campaign-led or estate-backed rather than pure subscription software, although digital OOH adds audience targeting, placement controls and post-campaign measurement to the operating model.
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London has 178 actively trading OOH advertising firms, a compact cohort by the standards of the capital’s broader advertising services market. Reported employment totals 201 people, suggesting that many operators rely on lean commercial, estate-management and campaign-operations teams, with production and installation capacity often sitting around the core business. Scale is uneven: 21 firms report turnover above £5M, while 16 were incorporated since 2022. That mix gives the market a mature estate-and-agency base with a smaller layer of newer specialists.
Posters, billboards and other outdoor public-space ads sit within the UK’s advertising self-regulatory regime. ASA/CAP guidance places particular weight on ads not misleading, harming or offending, and on whether placement and targeting are suitable for the audience likely to see them. Planning control is another constraint. GOV.UK guidance treats advertisement display as a separate consent process: some formats are permitted without a fresh approval, some have deemed consent, and some need express consent from the local planning authority. Where consent is required, unauthorised display can be a criminal offence. Outsmart provides the main trade-body frame for media owners.
Further digitisation appears more likely to change operating discipline than to remove the estate-led character of the market. Buyers tend to want better audience selection, cleaner proof-of-delivery and clearer controls on where ads appear, especially around sensitive categories and public spaces. Smaller specialists may find that compliance, measurement and landlord access absorb more management time, while scaled operators retain an advantage where they control permitted locations. Consolidation remains plausible, but the sector still depends on local relationships, planning consent and campaign execution rather than software distribution alone.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
178
Active firms
2026
21
Above £5M
reported turnover
16
Since 2022
new incorporations
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Key facts
About 11% of the trading cohort reports turnover above £5M (21 of 178 firms) — the rest sits below that revenue band.
8% of the cohort was incorporated since 2022 (16 firms), so a sizeable share is in its first few filing cycles.
ASA/CAP guidance for posters, billboards and other outdoor public-space ads says placement and targeting are important because ads should not mislead, harm or offend.
Outdoor advertising may be permitted without consent, have deemed consent, or require express consent under the Town and Country Planning (Control of Advertisements) (England) Regulations 2007.
UK out-of-home advertising investment reached £1,426.3M in 2025, including £954.6M from digital out-of-home formats.
Outsmart says it represents media owners responsible for over 90% of sector revenue.
Globally, digital OOH accounted for $17.9bn USD in 2024, almost 39% of all OOH revenues.
Top London OOH Advertising companies
Operates commercial radio stations and digital audio streaming via Global Player, and runs a large outdoor advertising network. Provides advertisers with radio, digital audio and out‑of‑home…
Serves a mixed market: UK consumers who listen to radio and audio content, and brands, advertisers and media agencies buying radio, digital audio and outdoor advertising across the UK and Europe.
Location
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Operates commercial radio stations and digital audio platforms, including the Global Player app, and provides outdoor advertising through a network of roadside posters, digital screens, and airport…
Serves a mixed market: UK consumers who listen to commercial radio and audio content, plus brands, media agencies and public-sector advertisers seeking large UK audiences across radio, digital audio…
Location
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Owns and operates large-format outdoor advertising sites, including digital screens and banner displays. Provides advertising space and digital display platforms for brand campaigns across prominent…
Serves brands and media agencies buying premium large-format outdoor advertising in high-footfall urban locations, particularly London and Manchester, across consumer sectors seeking city-centre…
Location
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Operates an outdoor advertising network including billboards, digital screens, bus and transport media, and retail advertising sites. Sells advertising space to brands and agencies and integrates…
Serves brands, media agencies and advertisers planning national or local campaigns across the UK and Europe, including organisations seeking mass-market consumer reach through outdoor, radio and…
Location
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Operates commercial radio stations and digital audio platforms, including the Global Player app, and manages an outdoor advertising network of roadside, airport and digital display sites. Sells…
Sells to businesses and organisations buying advertising, including brands, agencies and partners seeking UK audiences through radio, digital audio and outdoor media. Also serves consumers listening…
Location
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Financial sub-scores
Computed from 5 filingsOperates commercial radio stations and digital audio platform Global Player, producing live radio, podcasts and music content. Sells advertising across radio broadcasts, streaming audio and a large…
Serves both consumers and advertisers. Sells radio, streaming and outdoor media to UK audiences, and targets brands, agencies and campaign buyers seeking to reach mass UK consumers through audio and…
Financial Health
HealthyHealthy · Hiring · 11% CAGR over 4y
Location
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Computed from 2 filingsOperates a digital out-of-home advertising network of screens installed in residential, lifestyle and business buildings, enabling advertisers to run targeted campaigns with real-time data and…
Serves marketers, brands and agencies seeking audiences in premium residential, lifestyle and business environments, alongside property managers and building owners in the UAE and Central London.
Financial Health
StrongStrong · Hiring · 199% CAGR over 1y
Location
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Computed from 5 filingsOperates a network of digital out-of-home advertising screens and billboards, providing advertising placements across roadside sites, shopping centres, retail parks and leisure venues. Also offers…
Sells to businesses and brands buying out-of-home advertising, from local businesses seeking nearby reach to national advertisers running UK-wide campaigns across retail, roadside, city-centre,…
Financial Health
StableStable · -68% CAGR over 4y
Location
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Computed from 5 filingsOperates an out-of-home advertising network providing classic poster sites and digital billboards. Offers national and local advertising placements across roadside, city centre, leisure and…
Serves B2B advertisers, from major UK brands and media agencies running national campaigns to small local businesses seeking nearby in-store footfall across the UK.
Financial Health
StableStable
Location
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Computed from 5 filingsOperates out-of-home advertising networks providing digital screens and outdoor media sites. Sells and manages advertising space and campaigns for brands, connecting advertisers with audiences…
Sells to brands and advertisers seeking out-of-home advertising, particularly those wanting to reach target audiences across major UK cities. Serves business customers running campaigns that need…
Financial Health
StableStable · 0% CAGR over 4y
Location
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Computed from 5 filingsOperates out-of-home TV broadcasting networks and digital screens in commercial venues, providing screen hire and installation, content distribution, and advertising placements for brands and…
Serves advertising agencies, TV and VoD advertisers, brands, and commercial estate owners seeking to reach or engage audiences through out-of-home screen networks in premium UK locations.
Financial Health
StrongStrong · Growing, Hiring · 32% CAGR over 4y
Location
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Computed from 2 filingsProvides out-of-home advertising media in transport and leisure environments, including advertising on train tickets, station ticket gates, LeShuttle services and cinema screens, connecting brands…
Serves brands and media agencies seeking to reach consumers in high-dwell transport and cinema environments, including rail, ticket gate, LeShuttle and cinema audiences.
Financial Health
HealthyHealthy · Growing · 3% CAGR over 1y
Location
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Computed from 5 filingsProvides media advertising services focused on outdoor and indoor placements. Plans campaigns, designs advertising content, and manages media buying for billboards, digital out‑of‑home screens,…
Serves B2B brands and marketing teams, including businesses of all sizes seeking outdoor, indoor, transit and airport advertising campaigns to reach target audiences in public and high-traffic spaces.
Financial Health
HealthyHealthy
Location
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Computed from 4 filingsOperates media and advertising platforms focused on urban environments, including publishing and digital out‑of‑home media networks. Designs and produces branded installations and materials, and…
Serves brands, advertisers and agencies seeking urban and out-of-home media audiences, plus public and private organisations involved in cultural heritage and city-space projects across major…
Financial Health
StrongStrong · Hiring · 19% CAGR over 3y
Location
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Computed from 5 filingsProvides out-of-home advertising services, specialising in lamppost banner campaigns. Installs and manages roadside posters, illuminated displays, advertising flags and city dressing for brands,…
Serves brands, businesses, event organisers, media agencies and public sector bodies such as local authorities seeking out-of-home advertising across the UK and Europe.
Financial Health
StableStable · -1% CAGR over 4y
Location
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Computed from 5 filingsOperates a digital out-of-home advertising network in takeaway chicken shops, installing and managing in-store screens and selling advertising placements to brands seeking to reach customers through…
Targets brands, media agencies and advertisers whose campaigns need access to diverse urban consumer audiences, including harder-to-reach community segments.
Financial Health
HealthyHealthy · Hiring · 11% CAGR over 4y
Location
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Provides cinema advertising services, selling on‑screen advertising across cinema networks. Offers campaign planning and media buying tools, audience research, and production services to convert…
Sells to brands and media agencies buying cinema advertising, serving B2B marketing and media planners seeking to reach UK film audiences. Also serves cinema partners and film distributors/exhibitors…
Location
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Computed from 3 filingsOperates an immersive digital entertainment and media venue featuring large-scale interactive screens, live music spaces and cultural exhibitions. Produces digital content and sells advertising…
Serves London visitors, families and live music audiences, alongside brands, advertisers, event organisers and partners seeking venue, retail and media opportunities.
Financial Health
StableStable · -89% CAGR over 2y
Location
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Computed from 3 filingsProvides cinema advertising services, selling on‑screen advertising and marketing campaigns shown before films in cinemas. Also operates a website featuring film news, reviews, trailers and cinema…
Serves businesses seeking cinema advertising, particularly brands, media agencies and marketing teams wanting to reach cinema audiences through on-screen advertising.
Financial Health
StableStable
Location
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Computed from 5 filingsProvides out-of-home advertising services focused on poster placements inside NHS hospitals. Partners with hospital trusts to install and manage poster sites and sells advertising space to brands and…
Serves UK advertisers, brands, agencies and public sector bodies such as councils seeking to reach patients, visitors and NHS staff in hospital settings.
Financial Health
StrongStrong · Growing, Hiring · 9% CAGR over 4y
Location
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Computed from 5 filingsOperates an out-of-home advertising network in private jet terminals, partnering with fixed-base operators (FBOs) to place digital and physical advertising displays and run brand activations…
Serves luxury and premium brands, advertisers and agencies targeting private jet travellers, alongside FBOs and private aviation terminal partners globally.
Financial Health
HealthyHealthy · Hiring · 11% CAGR over 4y
Location
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Computed from 5 filingsDevelops and operates city‑centre media and entertainment districts combining large‑scale digital screens, galleries, live music venues and retail spaces. Produces and hosts audiovisual exhibitions,…
Serves consumers visiting entertainment, music, arts and gaming attractions, and businesses including advertisers, brand partners, event organisers and venue hirers targeting city-centre London…
Financial Health
DistressedDistressed
Location
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Computed from 5 filingsOperates an interactive campus TV network in university venues, streaming music videos on connected screens and through a mobile app that lets students request tracks and access offers. Provides…
Serves UK universities and student unions, national advertisers and music labels seeking to reach 18-24-year-old university students, with students as app users and offer recipients.
Financial Health
StableStable · Hiring · 9% CAGR over 4y
Location
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Computed from 5 filingsProvides cinema advertising services, selling on‑screen advertising across partner cinemas. Offers campaign planning and buying, audience and film scheduling data, and production services to convert…
Serves brands, advertisers and media agencies planning UK cinema campaigns, including marketing teams seeking film-audience targeting, campaign planning, buying routes and cinema-format production…
Financial Health
StrongStrong
Location
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Computed from 3 filingsDevelops software platforms for digital out‑of‑home (DOOH) media owners to manage advertising inventory, bookings and campaign delivery. Provides programmatic and direct sales integrations, yield…
Serves B2B customers in out-of-home advertising, including digital media owners, retail media network operators and DOOH integrators, from international operators to challenger outdoor advertising…
Financial Health
StableStable · Hiring · 41% CAGR over 2y
Location
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Computed from 3 filingsProvides digital TV display systems and content for pharmacies and healthcare practices. Supplies in‑store screens, tailored health information, and promotional messaging used to communicate with…
Sells to UK healthcare practices, primarily community pharmacies, as well as GP surgeries, dental clinics, opticians and aesthetic specialists seeking patient-facing communications and in-practice…
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StrongStrong · Hiring · 29% CAGR over 2y
Location
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Provides a demand-side platform for programmatic digital advertising, enabling marketers to buy and manage campaigns across channels including connected TV, mobile, display, audio and digital…
Serves B2B advertisers, brand and performance marketing teams, agencies and programmatic media buyers across channels including CTV, audio, mobile, display, native, video and digital out-of-home.
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Computed from 5 filingsProvides media planning and buying services for advertising campaigns. Conducts market and audience research, develops campaign strategies, manages digital, social, programmatic and offline…
Serves businesses and organisations running media campaigns in complex international markets, especially teams needing to reach hard-to-reach audience segments through strategic planning, buying and…
Financial Health
StrongStrong · Hiring · 32% CAGR over 4y
Location
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Computed from 3 filingsProvides content marketing and media services for travel and tourism brands, including client publishing, advertising sales, email campaigns, influencer management and translation. Publishes visitor…
Serves B2B clients in the travel and visitor economy, including tourism brands, London attractions, luxury hotels and concierges, business improvement districts, retailers and tourism bodies seeking…
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StrongStrong · Growing, Hiring · 29% CAGR over 2y
Location
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Computed from 5 filingsRepresents visual artists and brokers partnerships with brands, developers, and cultural institutions. Develops and manages public art commissions, visual campaigns, art acquisitions, and licensing…
Serves global brands, cities, entertainment companies, property developers, architects, local authorities, BIDs, cultural institutions, and art buyers engaging with visual artists.
Financial Health
StableStable · Hiring · 5% CAGR over 4y
Location
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Computed from 5 filingsProvides audio and video streaming and distribution services, including licensed music and video content for TV, mobile, web, and in‑car platforms. Also offers radio broadcasting, karaoke and music…
Serves advertisers, retailers and other businesses, plus TV, mobile, automotive and web platforms. Also sells subscriptions and entertainment products to consumers worldwide.
Financial Health
WeakWeak
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Computed from 3 filingsProvides in-store media and customer experience solutions for businesses, including licensed background music, digital signage, video displays, audio messaging, audiovisual systems, scent marketing,…
Serves SMBs, franchises, and enterprise/global businesses, especially multi-location brands in retail, QSR, restaurants, automotive, convenience stores, financial services, fitness, grocery,…
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HealthyHealthy · Hiring · 11% CAGR over 2y
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Computed from 3 filingsProvides in-store media and customer experience systems for businesses, including licensed background music, audio messaging, digital signage, video walls, AV and drive‑thru sound systems, scent…
Serves small and medium businesses, franchises, and enterprise/global brands in retail, QSR, automotive, convenience stores, financial services, fitness, grocery, healthcare, hospitality,…
Financial Health
DistressedDistressed
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How London OOH Advertising companies work and how to sell to them
What they do
London OOH media owners earn revenue by selling access to physical and digital advertising sites across streets, transport environments, retail settings and venues. Pricing is usually built around format, location, audience profile, campaign duration and availability, with digital screens adding time-of-day scheduling and creative rotation. Agencies and operators make money through planning fees, buying margins, production management, installation, maintenance and reporting, while estate-facing businesses may work on fixed rent or revenue-share arrangements with landlords. The commercial shape is therefore closer to campaign inventory and managed operations than recurring software, even where digital placement tools sit underneath it.
Who they sell to
Most sales activity runs through media agencies and direct advertiser teams, with marketing directors, heads of media, brand managers and procurement teams involved in larger buys. Direct clients tend to include retailers, entertainment advertisers, property groups, visitor attractions and public-space venue operators. Campaign purchases can move quickly where sites, creative and approvals are already known; estate access, transport environments and public-sector-adjacent placements usually take longer because legal, property and consent checks sit alongside the media decision. Procurement is mixed: repeat agency relationships, direct sales, framework-style arrangements and competitive pitches all appear, depending on whether the buyer is purchasing media, appointing an operator or monetising an estate.
What they buy
Most OOH advertising firms tend to spend on tools and services that make inventory easier to sell, schedule, deliver and prove. Common software categories include CRM, proposal generation, inventory management, campaign booking, digital screen scheduling, proof-of-posting, audience measurement, finance, billing and document management. Operators with field teams also need mobile job management, asset maintenance, health and safety processes, insurance support and installation partners. Digital OOH adds spend on cloud hosting, content approval workflows, monitoring, security and data integrations, while agencies usually have a heavier requirement for planning, reporting, analytics and client-service workflow. Legal, planning, accountancy, recruitment and creative production services remain relevant across the market.
Why and how to sell to them
OOH buyers tend to evaluate suppliers when campaign volume outgrows manual booking processes, when a new estate or venue contract is won, or when digital screens make scheduling and reporting more complex. Other triggers include leadership change, new procurement discipline, pressure from agencies for better proof-of-delivery, or tighter scrutiny around placement suitability. Outbound messages usually land better when they connect to yield, occupancy, audit trails, consent risk, campaign turnaround or landlord reporting rather than generic marketing efficiency. Sellers should expect practical objections: site access, legacy spreadsheets, agency habits and operational disruption often matter as much as price.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
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