Marketing Agency Companies in London: 21,549 Active Firms (2026)
Marketing agencies in London plan, buy and optimise campaigns across digital and offline channels for UK and international clients.
Buying centres tend to sit with chief marketing, growth, commercial and customer acquisition teams rather than with procurement alone. London agencies serving business clients usually cluster around campaign strategy, media planning, performance marketing, search, social, content and analytics, with acquisition as the recurring budget holder. Engagements are commonly retained where always-on performance or content programmes are involved, and project-based where launches, repositioning or channel audits drive the work. At the larger end, delivery needs senior commercial, creative, media and measurement teams, plus privacy-aware workflows for audience activation and reporting.
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London contains 21,549 actively trading marketing agencies, with 203 reporting turnover above £5M and 6,947 incorporated since 2022. Reported employment totals 3,434 people across firms that disclose headcount, giving the cohort a visible labour footprint without implying that every small studio publishes staff numbers. The shape is mixed: many agencies remain compact service businesses, while the revenue threshold points to a thinner band of scaled operators serving retained accounts and international clients.
Campaign work sits across several UK regimes rather than a dedicated agency licence. The ICO governs personal data, direct marketing and PECR compliance, which matters for prospecting, retargeting, attribution and customer-list activation. The ASA enforces the CAP Code across advertisers, agencies and media, so claims, targeting and paid creator content carry conduct risk even where the client owns the brand. Ofcom, the CMA and trading standards can also be relevant where electronic communications networks or unfair-trading rules are in scope. DMA membership adds a trade-body code for direct marketing, rather than a statutory licence.
Demand appears to be tilting toward agencies that can connect creative work with measurable acquisition, consented audience use and channel-level reporting. That favours teams with media, analytics and compliance capability in the same operating model, while small studios may remain dependent on narrow project briefs and founder-led selling. Scale-up scarcity is likely to keep acquisition interest focused on agencies with retained revenue and specialist client bases. Regulatory pressure around direct marketing, claims and online targeting also tends to reward process discipline over volume-led outreach.
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
21,549
Active firms
2026
203
Over £5M
Turnover-reported companies
6,947
New since 2022
London incorporations
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Key facts
About 1% of the trading cohort reports turnover above £5M (203 of 21,549 firms) — the rest sits below that revenue band.
32% of the cohort was incorporated since 2022 (6,947 firms), so a sizeable share is in its first few filing cycles.
The ICO regulates data protection and PECR for direct marketing, while Ofcom, the CMA, trading standards and the ASA can also apply depending on the channel and claim.
The CAP Code applies to advertisers, agencies and media, so campaign governance usually spans client, agency and publisher responsibilities.
UK ad spend increased by 10.4% in 2024 to £42.6 billion, with online formats growing 13.2%.
£4 in every £5 of UK ad budgets was spent online in 2024, and search reached £16.9 billion.
UK advertising and market research services exports were £15 billion in 2021, up 32.5% year on year; the US imported just under £3.9 billion.
Top London Marketing Agency companies
Financial sub-scores
Computed from 5 filingsProvides digital marketing and performance media services including SEO, paid search and social advertising, display and programmatic media buying, influencer marketing, data analytics, and web…
Serves marketing teams and growth-focused organisations, including B2B brands and companies in sectors such as fintech, property and housing, and pharmaceuticals, with an international client base.
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
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Computed from 5 filingsProvides media planning and buying across online and offline channels, including search engine optimisation, paid and organic search strategy, data analytics, and content strategy. Develops…
Serves brands and marketing teams, particularly in property and travel, including developers, shared ownership providers, airlines and other consumer-facing organisations.
Financial Health
HealthyHealthy · Hiring · 29% CAGR over 4y
Location
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Computed from 5 filingsProvides digital marketing and media services including paid media management, SEO and local search optimisation, local listing and reputation management, analytics and data science, creative…
Sells to businesses, particularly enterprise and multi-location brands seeking full-funnel digital marketing. Targets marketing teams needing local search, media, analytics, SEO, web and…
Financial Health
StableStable · Hiring · 7% CAGR over 4y
Location
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Computed from 5 filingsProvides digital marketing and creative agency services, including social media strategy and management, campaign strategy and creation, media planning and buying, influencer and content creator…
Targets B2B marketing leaders at global consumer brands, particularly FMCG, health and beauty, and food and drink companies with social, influencer, paid media and campaign needs.
Financial Health
StrongStrong · Growing, Hiring · 102% CAGR over 4y
Location
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Computed from 5 filingsProvides media planning and media buying services for brands, developing advertising campaigns across TV, video on demand, outdoor, radio, social media, programmatic, paid search, print, cinema and…
Serves B2B and consumer brands, from start-ups to global advertisers, as well as agency partners needing media campaign support across sectors such as technology, utilities and energy.
Financial Health
HealthyHealthy · Hiring · 19% CAGR over 4y
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Computed from 5 filingsProvides international digital marketing services including paid search advertising, social media marketing, SEO, and multilingual optimisation. Also offers marketing strategy consulting, data…
Serves brands and marketing teams seeking international growth, especially in financial services, insurance, fintech, B2B, travel and hospitality, e-commerce, and sports.
Financial Health
StableStable · 0% CAGR over 4y
Location
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Computed from 5 filingsProvides digital marketing services including performance marketing, media strategy, customer relationship management, content and brand campaigns, and digital transformation. Works with brands to…
Serves B2B clients ranging from global enterprises and established brands to local start-ups, including organisations in retail, travel, payments, healthcare and consumer goods.
Financial Health
WeakWeak · -68% CAGR over 4y
Location
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Computed from 5 filingsProvides media planning and media buying services for advertisers, including digital display, content, programmatic advertising and search engine marketing. Conducts market and competitor analysis…
Serves B2B organisations, particularly financial services firms and advertisers running international campaigns, targeting marketing teams with media budgets.
Financial Health
HealthyHealthy · Hiring · 7% CAGR over 4y
Location
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Computed from 3 filingsOperates as the holding company for a group providing B2B digital marketing services, including content creation, demand generation campaigns, paid media performance analysis, and marketing…
Serves B2B marketers at enterprise and SMB organisations, especially technology, financial services, education, government and health brands, including teams targeting developers and global customer…
Financial Health
DistressedDistressed
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Computed from 5 filingsProvides media planning and buying services for financial services brands, using audience data, market insights and technology to plan campaigns, place advertising across channels, and deliver media…
Serves global financial services brands, particularly marketing and communications teams targeting specialist audiences across international markets.
Financial Health
HealthyHealthy · Hiring · 3% CAGR over 4y
Location
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Computed from 5 filingsProvides media planning and buying services for brands. Conducts audience and market research, develops media strategies, plans and purchases advertising across channels, and measures campaign…
Serves B2B and consumer brands, targeting senior marketing leaders and growth teams seeking agency support for media investment, audience strategy and campaign performance.
Financial Health
HealthyHealthy · Hiring · 9% CAGR over 4y
Location
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Computed from 5 filingsProvides B2B performance marketing and demand generation services, including paid social and PPC advertising, account‑based marketing (ABM), sales outreach automation, and content syndication,…
Serves B2B marketing teams and demand generation leaders at growth-stage and large brands, especially under-resourced departments needing external support across pipeline-focused campaigns.
Financial Health
StrongStrong · Growing, Hiring · 50% CAGR over 4y
Location
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Computed from 5 filingsProvides media planning and buying services for brands and charities, using audience insight and data analysis to plan, place and measure advertising across channels including TV, out‑of‑home and…
Serves B2B clients including charities, consumer brands and commercial organisations, with examples spanning visitor attractions, NGOs, food and drink, and fitness or wellness brands.
Financial Health
StrongStrong · Growing, Hiring · 16% CAGR over 4y
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Computed from 5 filingsProvides media planning and buying services for brands, managing advertising campaigns across channels such as TV and digital media. Develops media strategies, optimises campaigns, and supports…
Serves brand-side marketing teams at new and established businesses, including consumer brands in sectors such as fintech, beauty, sport, insurance and ecommerce.
Financial Health
StrongStrong · Hiring · 8% CAGR over 4y
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Computed from 5 filingsProvides digital marketing and analytics services including digital planning, paid media management, conversion optimisation, performance creative, customer engagement campaigns, and data…
Serves marketing and commercial teams at growth-focused businesses, including ecommerce brands, media companies, travel businesses and professional services firms seeking embedded agency support.
Financial Health
StrongStrong · Growing, Hiring · 32% CAGR over 4y
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Computed from 5 filingsProvides digital marketing and brand consultancy services for B2B organisations, including brand strategy, media planning and buying, customer experience design, sales activation, and development of…
Sells to B2B brands and complex organisations, especially ambitious professional services firms and large enterprises needing to reach hard-to-access audiences, improve digital performance, and…
Financial Health
StableStable · -1% CAGR over 4y
Location
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Computed from 3 filingsProvides digital consultancy and marketing services, including digital strategy, website and digital experience design and development, data and AI analytics, search engine optimisation, paid media…
Serves considered-purchase brands and organisations, including insurance, agriculture, FMCG, higher education and corporate finance clients, typically marketing and digital leaders.
Financial Health
WeakWeak · Hiring · 8% CAGR over 2y
Location
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Computed from 4 filingsProvides B2B marketing and communications services including brand positioning, messaging development, public relations, content marketing, campaign strategy, analyst and media relations, sales…
Targets growth-focused B2B innovators and market disruptors, especially technology, SaaS, cybersecurity, fintech and telecoms brands, with buyers including CEOs, CMOs and sales/marketing leaders.
Financial Health
StrongStrong · Growing, Hiring · 22% CAGR over 3y
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Computed from 3 filingsProvides digital performance marketing services including paid media management, search engine optimization, local search and reputation management, analytics, creative production, and web…
Serves enterprise and multi-location brands, targeting marketing teams and business leaders that manage many sites, local listings, or regional customer journeys.
Financial Health
HealthyHealthy · -1% CAGR over 2y
Location
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Computed from 5 filingsProvides marketing and media agency services including audience research, media planning and buying, branding and creative development, digital product and website design, and social media…
Serves B2B clients in culture, arts and entertainment, including brands, venues and ticketed attractions seeking marketing, media and digital support. Targets organisations wanting to reach arts and…
Financial Health
StrongStrong · Growing, Hiring · 4% CAGR over 4y
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Computed from 5 filingsProvides marketing and communications services including public relations, influencer marketing, creative campaign development, social media management, content production, performance marketing,…
Serves UK and international consumer and B2B brands, including beauty, sports, food and drink, fashion, lifestyle, ecommerce and corporate clients, typically marketing and communications teams.
Financial Health
StableStable · -2% CAGR over 4y
Location
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Computed from 5 filingsProvides media planning and media buying services for brands, developing advertising strategies, audience targeting and cross‑channel campaign plans. Uses data insights and performance measurement to…
Serves growth-focused brands and marketing teams, including organisations with commercial objectives that need media agency support, audience targeting and global campaign reach.
Financial Health
HealthyHealthy · Growing, Hiring · 2% CAGR over 5y
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Computed from 5 filingsProvides media planning and buying services for brands, using data analysis and audience insights to design and manage advertising campaigns across multiple channels, including digital, broadcast,…
Serves brands across multiple sectors, from start-ups to industry leaders, including hospitality, flexible workspace, property and B2B technology clients seeking media and advertising support.
Financial Health
StableStable · -62% CAGR over 5y
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Computed from 5 filingsProvides marketing and communications services including brand strategy, advertising, public relations, digital marketing, influencer marketing, corporate communications, crisis management, investor…
Serves B2B and B2C brands, associations and organisations worldwide across consumer, health, technology, financial services, education, energy, manufacturing, travel, tourism, sustainability and…
Financial Health
StableStable · Hiring · 43% CAGR over 4y
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Computed from 5 filingsProvides influencer marketing services for brands, including campaign strategy, creator partnerships, paid social advertising, community management, and social video production. Uses proprietary…
Serves global brands and fast-growing startups, particularly consumer-facing companies in technology, fashion, food, beauty and lifestyle sectors, with buyers likely in marketing, brand, social media…
Financial Health
StrongStrong · Growing, Hiring · 22% CAGR over 4y
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Computed from 3 filingsProvides media planning and media buying services across digital, print, broadcast and outdoor channels. Develops advertising strategies, manages campaign placement, and analyses performance for…
Serves B2B organisations and brands with paid-media needs, especially charities and not-for-profits, FMCG and technology companies, emerging brands, and challenger organisations with ambitious…
Financial Health
StrongStrong
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Computed from 5 filingsProvides marketing and digital strategy services including brand development, website design and build, search engine optimisation, performance marketing, data analysis and campaign management to…
Serves B2B organisations, charities and not-for-profits, including clients in retail, finance, travel and leisure, aerospace/technology and consumer brands, targeting marketing and leadership teams.
Financial Health
HealthyHealthy · -64% CAGR over 4y
Location
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Computed from 5 filingsProvides digital marketing services including strategy development, SEO, pay‑per‑click advertising, and social media marketing. Plans and manages online campaigns and lead‑generation activities for…
Serves B2B companies, healthcare organisations and international brands, working with businesses of varying sizes and internal marketing teams in London and abroad.
Financial Health
HealthyHealthy · -5% CAGR over 4y
Location
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Computed from 5 filingsProvides data-driven marketing and customer experience services including data cleansing and enrichment, database marketing, digital and content marketing, account‑based marketing, inside sales…
Serves businesses needing outsourced marketing, sales, customer care and logistics support, particularly brands in beauty, CPG, e-commerce, entertainment, financial services, healthcare, retail and…
Financial Health
StableStable · -4% CAGR over 4y
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Computed from 5 filingsProvides international media planning and advertising services, including digital and programmatic advertising, content marketing, and print campaign placement. Works with publishers and media titles…
Serves marketing teams and media agencies at brands seeking international advertising placements across business, finance and news media titles in multiple markets.
Financial Health
WeakWeak · -69% CAGR over 4y
Location
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Computed from 3 filingsProvides performance-based lead generation services, creating and managing digital advertising campaigns, landing pages and advertorials across social and native channels, and supplying verified…
Serves B2B brands in financial services and home improvement, particularly marketing and sales teams seeking high-volume, pay-on-results lead generation across native and social channels.
Financial Health
HealthyHealthy · Hiring · 5% CAGR over 2y
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Computed from 3 filingsProvides managed B2B digital advertising services including account-based marketing insights, audience targeting, programmatic media buying and campaign execution across display, video, audio and…
Serves B2B marketing and advertising teams at businesses seeking to reach target accounts and buying committees across digital channels, including marketers running account-based, programmatic and…
Financial Health
StableStable · -74% CAGR over 2y
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Computed from 3 filingsProvides international TV advertising services, including media planning, media buying and campaign execution across multiple countries. Uses audience data to develop strategy, optimise TV campaigns,…
Serves B2B marketing teams and agencies at ambitious international brands active across multiple countries, with explicit experience in iGaming and tourism sectors.
Financial Health
HealthyHealthy · Hiring · 183% CAGR over 2y
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Computed from 5 filingsProvides digital marketing services including paid search and paid social advertising, YouTube and video campaigns, shopping feed management, organic social media, analytics and measurement, and…
Serves B2B and consumer-facing businesses, especially ecommerce retailers and lead-generation companies, targeting heads of ecommerce, digital marketing managers and in-house marketing teams.
Financial Health
StrongStrong · Hiring · 12% CAGR over 5y
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Computed from 5 filingsProvides digital marketing services including search engine optimisation, paid search advertising, digital PR and social media marketing. Uses data and AI tools to improve brand visibility across…
Serves B2B marketing teams at consumer, ecommerce and lifestyle brands seeking external search, social and PR agency support, including organisations operating across multiple markets.
Financial Health
StrongStrong · Growing, Hiring · 17% CAGR over 4y
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Computed from 5 filingsProvides marketing and creative agency services including brand and campaign strategy, content production, social media management, paid media planning and buying, and public relations. Develops…
Serves B2B brand and marketing teams at consumer-facing companies, including drinks, telecoms, travel, automotive partnerships and lifestyle brands, from established global brands to growing…
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
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Computed from 5 filingsDevelops data-driven algorithms and machine learning tools for media planning and advertising. Analyses large datasets to plan, activate, and optimise campaigns across programmatic, social, and…
Serves brand marketing and media teams in B2B, D2C, education, broadband, charity, software, retail, entertainment and travel sectors using programmatic, social and e-commerce advertising.
Financial Health
StableStable · -53% CAGR over 4y
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Computed from 3 filingsProvides digital marketing and brand consultancy services including brand strategy, storytelling, experience design, demand generation campaigns, marketing technology optimisation, and marketing…
Serves B2B marketing and sales leaders at mid-market and enterprise companies, including global industrial, manufacturing, technology and engineering brands seeking digital growth across multiple…
Financial Health
StableStable · Hiring · 21% CAGR over 2y
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Computed from 5 filingsProvides multicultural advertising and marketing services, including cultural insight consulting, digital marketing, media planning and buying, and creative campaign production to help brands reach…
Serves brands and public sector organisations across the UK, spanning B2B and B2C markets such as FMCG, retail, finance, technology and healthcare, that need to engage multicultural and diverse…
Financial Health
StrongStrong · Growing · 0% CAGR over 5y
Location
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Computed from 4 filingsProvides digital marketing and technology consulting services including digital advertising management, marketing data analytics, adtech implementation, and cloud and e‑commerce solutions. Helps…
Sells to businesses’ in-house marketing, analytics and IT teams, and collaborates with media agencies. Targets companies seeking digital growth through advertising, data, ecommerce and cloud,…
Financial Health
HealthyHealthy
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Computed from 2 filingsDevelops and executes digital engagement and fundraising campaigns for corporations, non-profits and advocacy groups. Services include campaign strategy, grassroots mobilisation, customer engagement,…
Serves corporations, nonprofits, advocacy organisations and political campaigns, with buyers including fundraising, communications, marketing, advocacy and digital teams.
Financial Health
StableStable · 6% CAGR over 1y
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Computed from 3 filingsProvides digital advertising planning and media buying using geo-contextual audience data. Develops and delivers targeted campaigns across digital channels, using its TraffiQ analytics platform and…
Serves brands and marketing teams seeking audience-based digital advertising, especially buyers prioritising geo-contextual targeting, data transparency and lower-carbon media campaigns.
Financial Health
HealthyHealthy · -89% CAGR over 2y
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Computed from 5 filingsProvides influencer marketing and social media advertising services, planning and managing creator‑led campaigns for brands. Services include creator sourcing and contracting, content production,…
Serves B2B marketing, media and commerce teams at global consumer brands seeking creator-led social campaigns, including retail, FMCG, entertainment and financial services advertisers.
Financial Health
HealthyHealthy · -62% CAGR over 4y
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Computed from 3 filingsProvides marketing and brand strategy services focused on sports, gaming and entertainment sectors, including campaign development, sponsorship activation, audience insight research, and creative…
Serves B2B brand and marketing teams seeking sports, gaming and entertainment-led campaigns, including sponsors, rights holders and consumer brands such as technology, automotive and football…
Financial Health
StableStable · -23% CAGR over 2y
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Computed from 5 filingsProvides recruitment marketing and talent attraction services including research and strategy, media planning and buying for job advertising, campaign activation and management, and creation of…
Serves UK and global employers across industries, particularly growing organisations and in-house recruitment or HR teams responsible for candidate attraction, recruitment marketing and resourcing…
Financial Health
WeakWeak · 2% CAGR over 4y
Location
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Computed from 5 filingsProvides marketing and communications consultancy, specialising in communications and media planning. Works with brands and agencies to develop integrated campaign strategies, coordinate media…
Serves brands and client-side marketing teams, plus creative and media agencies. Customers include consumer sectors such as food, beauty, fashion and culture, with some B2B and international briefs.
Financial Health
StrongStrong · Growing, Hiring · 30% CAGR over 4y
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Computed from 4 filingsProvides integrated marketing and communications services including public relations, social media management, digital marketing, search engine optimisation and campaign strategy, helping brands…
Serves national UK brands, large organisations, businesses and not-for-profits seeking to engage regional and local communities, with clients across retail, housing, cinema and healthcare.
Financial Health
HealthyHealthy · -78% CAGR over 3y
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Computed from 5 filingsProvides media strategy, planning and buying services for brands and organisations. Uses marketing insight and analysis to plan advertising campaigns and purchase media across channels such as TV,…
Serves challenger brands and charities, including consumer retailers, beauty brands, business services firms and fundraising organisations, primarily marketing teams seeking agency support.
Financial Health
WeakWeak · -65% CAGR over 4y
Location
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Computed from 5 filingsProvides advertising and marketing services including brand strategy, creative campaigns, public relations, CRM, and social media marketing. Develops cross‑channel brand ideas and communications for…
Serves marketing and brand teams at consumer-facing businesses, including hospitality, retail, financial services, gaming, drinks and property brands, typically established organisations managing…
Financial Health
DistressedDistressed · -5% CAGR over 4y
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Computed from 5 filingsProvides digital marketing services for B2B SaaS companies, including demand generation strategy, Google and LinkedIn advertising, content marketing, lead magnet campaigns, landing page development,…
Serves B2B SaaS startups and scale-ups, particularly founders and marketing leaders at companies with limited or no in-house marketing resources, from pre-£1m ARR to £20m ARR.
Financial Health
StrongStrong · Growing, Hiring · 44% CAGR over 4y
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How London Marketing Agency companies work and how to sell to them
What they do
London marketing agencies earn revenue by selling strategy, campaign delivery and measurement services, usually through retainers, fixed-fee projects, media-management fees or performance-linked components. Retained work tends to cover always-on acquisition, content, search, paid social and reporting, while projects often centre on launches, audits, messaging work or channel set-up. Delivery is a services model wrapped around software, media access and specialist labour, so margins depend on utilisation, subcontractor control, media billing treatment and the degree to which senior staff remain involved after the sale.
Who they sell to
Client-side buyers are usually chief marketing officers, growth leads, commercial directors, founders and heads of acquisition, with finance and procurement joining where retainers or media budgets are material. Most agencies sell to SMB and mid-market clients, while larger London firms tend to compete for enterprise, public-sector or international briefs. Smaller engagements may close through referrals and founder-led selling; larger retained accounts often involve chemistry meetings, audits, procurement checks and RFPs. Typical sales cycles range from quick tactical projects to slower reviews where incumbent agencies, budget cycles and compliance requirements shape timing.
What they buy
Most agencies tend to spend on tools and services that reduce delivery friction or help defend margin. Common categories include customer relationship management, proposal and pipeline tooling, finance and billing systems, project management, time recording, resource planning, campaign reporting, analytics, consent management, cyber security, cloud storage and collaboration software. Service spend often covers accountancy, employment law, commercial contracts, recruitment, freelance networks, training, design production, video, research and specialist media support. Agencies with larger retained accounts are more likely to care about audit trails, permissions, client reporting packs and integrations across sales, delivery and invoicing.
Why and how to sell to them
Buying intent often appears when agencies win larger retained accounts, add a new channel specialism, hire senior commercial or operations staff, merge teams, or face client pressure for clearer attribution and compliance evidence. Pain points tend to be margin leakage, manual reporting, inconsistent handovers, late client approvals, freelancer management and difficulty proving the value of work beyond channel metrics. Outbound angles usually land better when framed around billable time, client retention, lower rework, cleaner consent handling or faster month-end reporting, rather than generic productivity claims.
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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Frequently asked questions
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