Marketing Agency Companies Using Sanity in the UK: 55 Active Firms (2026)
Marketing agencies using a headless CMS build campaign, content and lead-generation websites for UK clients with structured digital publishing needs.
For agencies, a headless CMS usually sits between strategy, design, development and performance teams: content editors get reusable page modules, while developers keep presentation layers decoupled from publishing workflows. Adoption tends to signal a direct-channel posture rather than brochureware: clients want campaign microsites, gated content, localisation, personalisation and cleaner hand-off between creative production and measurement. These agencies are typically selling to B2B marketing, revenue and communications teams, with engagements scoped around retained content operations, web rebuilds or campaign platforms rather than one-off template sites.
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Across the UK, 55 actively trading marketing agencies are detected running this headless CMS on their own sites. Within the detected CMS mix for 4,809 UK marketing agencies, it sits ninth by category share at 1.1%, well behind template-led and open-source incumbents. The registered-office skew is London-heavy: 50.9% of the cohort is in London, followed by the South East at 12.7%, the South West at 10.9%, Yorkshire and The Humber at 7.3%, and the East Midlands at 5.5%. Reported employment totals 771 people, which points to a user base weighted toward small delivery teams rather than large agency networks.
Campaign work is not licensed under a unified agency regime, but agencies running a headless CMS still sit across privacy, advertising and consumer-protection rules. The ICO oversees data protection and PECR for direct marketing, while Ofcom has a role where public electronic communications networks are misused. The CMA and trading standards deal with unfair-trading rules, and the ASA enforces the CAP Code across advertisers, agencies and media owners. For direct-marketing work, the DMA code adds a trade-body standard for members. Procurement therefore tends to test consent capture, tracking governance, hosting arrangements and client sign-off rather than the CMS alone.
Adoption appears selective rather than default. Agencies with embedded development teams tend to keep using headless architecture where content modelling, site speed and campaign reuse matter to client scope; generalist shops are more likely to stay with bundled website platforms that reduce implementation overhead. Migration pressure may come from clients wanting cleaner consent journeys, quicker publishing hand-offs and tighter analytics governance. The constraint is commercial as much as technical: lean agencies need reusable components and hosting partners that do not add too much maintenance burden. Over time, use may cluster around agencies that sell web operations as a retained service rather than project-only delivery.
Adoption by company size
Adoption of Sanity rises with company size across the trading UK marketing agency companies in this cohort. 0.1% of the 54,246 companies with under 10 employees run Sanity (37 detected). 1% of the 1,903 companies with 10–50 employees run Sanity (19 detected). 0.7% of the 146 companies with over 50 employees run Sanity (1 detected). That is a 0.6% gap between the over 50 employees and under 10 employees bands.
55
Active firms
2026
1.1%
Of detected CMS share
UK marketing agency
7
Median headcount
Filed accounts
129
Verified contacts
Across this cohort
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Key facts
About 9% of the trading cohort reports turnover above £5M (5 of 55 firms) — the rest sits below that revenue band.
9% of the cohort was incorporated since 2022 (5 firms), so a sizeable share is in its first few filing cycles.
This headless CMS represents 1.1% of detectable CMS use among marketing agencies, against a 4,809-company denominator.
London accounts for 50.9% (28) of this headless-CMS marketing-agency cohort, ahead of the South East at 12.7% (7) and the South West at 10.9% (6).
Stack overlap is concentrated: 67.3% (37) also run the most common co-occurring technology, compared with 38.2% (21) for the next most common one.
Marketing campaigns sit across ICO data-protection and PECR oversight, ASA CAP Code enforcement, and CMA, trading standards and Ofcom rules on unfair trading and network misuse.
UK ad spend increased by 10.4% in 2024 to £42.6 billion, with online formats growing 13.2% and £4 in every £5 of budgets spent online.
CMS market share among UK Marketing Agency
Share of the 4,809 UK Marketing Agency with a detectable system. As of June 2026.
What else do Sanity-running Marketing Agency run?
Share of the 55 Sanity-running UK companies where each technology was also detected. As of June 2026.
Where Sanity Marketing Agency are, and how healthy they look
By region
By registered-office region; companies without a regional match count toward Rest of UK.
By financial health
From filed accounts; firms with fewer than two filings show as insufficient history.
7
Median headcount
£721.4K
Median UK turnover
9.1%
Above £5M turnover
5
Incorporated since 2022
129 verified decision-maker contacts
across these 55 companies, with emails available in Firmbase. Filter by role, seniority and stack.
Top UK Marketing Agency using Sanity
Ranked by sales-readiness score: an AI model assesses what each company does, its sector and size, and scores its overall fit. Best-fit prospects appear first.
Financial sub-scores
Computed from 3 filingsProvides web development and digital product design services, building headless websites and applications using technologies such as Sanity CMS, Next.js and Vercel. Also develops ecommerce sites,…
Serves businesses and brand teams needing headless websites, apps or ecommerce builds, including consumer brands, esports organisations, technology firms and content-led organisations using Sanity,…
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 2y
Location
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Financial sub-scores
Computed from 3 filingsProvides digital consultancy and development services, designing and implementing web platforms, e‑commerce systems and headless/MACH technology stacks. Supports organisations with ongoing digital…
Serves B2B organisations, from SMEs to global brands, with complex digital estates and ongoing technology needs, including businesses seeking long-term agency partnerships across international…
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsDesigns and develops digital products, websites and online platforms for businesses, including e‑commerce systems, membership platforms and AI‑powered publishing tools. Also provides product…
Serves businesses seeking digital products and marketing support, including publishing platforms, luxury consumer goods brands, drinks brands, and global brand agencies. Targets commercial…
Financial Health
WeakWeak
Location
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Financial sub-scores
Computed from 5 filingsProvides digital agency services including web development, bespoke web applications, content‑managed websites, and API integrations. Offers digital marketing such as SEO, PPC advertising and social…
Serves B2B companies, particularly marketing and leadership teams seeking agency support for digital strategy, web development and digital marketing.
Financial Health
StrongStrong · Growing, Hiring · 7% CAGR over 4y
Location
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Computed from 3 filingsProvides digital marketing services including web design and development, search engine optimisation, email marketing, social media management and advertising, animation and motion graphics, and…
Serves marketing and digital teams at established B2B and B2C brands, including finance, energy, consumer appliances, utilities and agribusiness organisations.
Financial Health
HealthyHealthy · Hiring · 22% CAGR over 2y
Location
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Computed from 5 filingsProvides outsourced advertising operations, digital marketing, and website development services. Manages online advertising campaigns, media operations and strategy, and builds websites and web…
Serves publishers, advertising agencies and brand-side businesses, primarily UK clients, needing outsourced ad operations, marketing support or website and web application development.
Financial Health
HealthyHealthy · Hiring · 3% CAGR over 4y
Location
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Computed from 5 filingsProvides web design, web development, and branding services for organisations. Designs and builds websites, including ecommerce and content‑managed sites using Craft CMS, and offers ongoing website…
Serves organisations seeking web design, development and branding, including employers, education providers, charities and human rights groups, architecture studios and ecommerce brands. Targets…
Financial Health
StableStable · 0% CAGR over 5y
Location
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Computed from 5 filingsDesigns and develops custom websites and web applications for businesses, including Shopify e‑commerce stores, WordPress sites and headless builds. Also creates bespoke systems such as fulfilment,…
Serves B2B clients including eCommerce brands, marketing agencies, SEO companies and brand agencies, plus companies seeking technical digital partnerships in the UK and internationally.
Financial Health
HealthyHealthy · Hiring · 6% CAGR over 4y
Location
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Computed from 5 filingsProvides web design and development services, specialising in UI/UX design, design systems and accessible websites built with Craft CMS. Also offers branding and visual identity design, and website…
Serves B2B organisations, startups, universities and technology/product teams seeking specialist web and brand agency support, including clients using Craft CMS or needing UX-focused digital products.
Financial Health
HealthyHealthy · Hiring · 29% CAGR over 4y
Location
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Computed from 5 filingsProvides digital agency services including website design and development, e‑commerce platforms, digital marketing campaigns, and brand strategy. Works with technology-focused businesses to build…
Serves B2B technology brands and growth-focused businesses, including IT services, logistics and cybersecurity firms seeking long-term digital partnerships and revenue-focused support.
Financial Health
StableStable · Hiring · 5% CAGR over 4y
Location
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Computed from 4 filingsProvides digital strategy and service design, user research, UX and product design, web application development, CMS and digital experience platforms, DevOps and cloud engineering, and data analytics…
Serves public and private sector organisations, particularly in healthcare and pharma, government, technology and information security, education, and finance, targeting teams responsible for digital…
Financial Health
DistressedDistressed · -10% CAGR over 3y
Location
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Computed from 3 filingsProvides B2B marketing services including marketing strategy, content creation, branding and design, social media management, digital marketing (SEO, PPC, paid social), PR, lead generation campaigns,…
Serves B2B companies, including startups and established brands, targeting leadership and marketing teams seeking growth, brand authority, lead generation and digital marketing support.
Financial Health
WeakWeak · Hiring · 6% CAGR over 2y
Location
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Computed from 5 filingsProvides digital marketing and web development services for businesses, including SEO (local, international and technical), PPC and paid social advertising, lead generation, digital PR, AI-driven…
Serves UK businesses, particularly service-based and local companies, seeking more online enquiries, leads and sales through search, paid media, web, content and AI-related marketing channels.
Financial Health
WeakWeak · -5% CAGR over 4y
Location
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Computed from 5 filingsProvides Shopify Plus ecommerce services including store design and development, platform migrations, and system integrations. Also delivers conversion rate optimisation, digital marketing, email…
Serves ambitious ecommerce and retail brands, including international Shopify Plus merchants and subscription, consumer goods, fashion, homeware, sports and food brands seeking to scale online sales.
Financial Health
StrongStrong · Growing, Hiring · 13% CAGR over 4y
Location
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Computed from 5 filingsProvides digital marketing and web development services, including PPC advertising on Google and Microsoft, social media marketing, search engine optimisation, and design, development and maintenance…
Serves businesses needing digital marketing and web development, including ecommerce firms, charities, tourism and travel organisations, and cultural attractions. Targets marketing teams and business…
Financial Health
WeakWeak · -13% CAGR over 4y
Location
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Computed from 5 filingsProvides branding, web design, and digital product design services. Develops websites, apps, and software platforms, and delivers marketing campaigns, UX/UI design, and digital strategy for…
Serves B2B companies, founders and brand teams across technology, SaaS, health, ecommerce, finance, AI, energy, wellness, education and gaming, from emerging ventures to established global brands.
Financial Health
HealthyHealthy · Hiring · 25% CAGR over 5y
Location
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Computed from 5 filingsProvides ecommerce services including custom Shopify store design and development, Shopify Plus builds, search engine optimisation (SEO), and pay‑per‑click (PPC) advertising management for online…
Serves established ecommerce brands needing Shopify development and performance marketing. Targets B2B buyers at online retail businesses, including sectors such as luxury jewellery, electrical…
Financial Health
StrongStrong · Hiring · 21% CAGR over 4y
Location
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Computed from 2 filingsProvides creative agency services including brand development, web design, digital and email marketing, social media management, campaign creation, UX/UI design, content production, and print and…
Serves businesses, public sector bodies and charities, particularly in financial services, insurance, healthcare and cancer research, targeting marketing, brand and communications teams.
Financial Health
WeakWeak · 0% CAGR over 1y
Location
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Computed from 5 filingsProvides product marketing and design services for SaaS companies on a subscription basis. Services include messaging and positioning research, branding, website and Webflow development,…
Serves high-growth SaaS startups and scaleups, particularly founders, CEOs and marketing teams with limited internal marketing or design capacity and recurring growth targets.
Financial Health
DistressedDistressed · -63% CAGR over 4y
Location
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Computed from 5 filingsProvides brand strategy, visual identity design, website and app design, UX/UI, social media planning, and creative campaign production. Works with fashion and luxury brands to develop brand…
Serves B2B clients in fashion and luxury, including designer fashion houses, jewellery and watch brands, beauty brands, hospitality and lifestyle brands, auction houses and industry bodies.
Financial Health
StrongStrong · Hiring · 37% CAGR over 4y
Location
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Computed from 5 filingsProvides brand strategy, identity design, naming, packaging, and campaign content, alongside digital strategy, website design, UX/UI, web development, motion graphics, and Shopify e‑commerce…
Serves founder-led and global consumer brands, especially hospitality, food and drink, retail/e-commerce and lifestyle businesses, selling to brand, marketing and digital teams.
Financial Health
WeakWeak · -4% CAGR over 4y
Location
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Computed from 5 filingsProvides experience design and digital development services including brand identity design, marketing websites, web applications, and digital products. Works with companies and nonprofits on UX…
Serves mission-led companies and nonprofits, including charities, NGOs, conservation organisations, health initiatives, food-waste businesses and social-impact startups.
Financial Health
WeakWeak · -6% CAGR over 5y
Location
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Computed from 5 filingsProvides digital product development services including strategy, UX/UI design and engineering. Designs and builds web and mobile applications, digital platforms and design systems, and supports…
Serves startups, scaleups and large enterprises, targeting product, design, technology and digital leaders across sectors such as media, sport, financial services, legal and service businesses.
Financial Health
StableStable · -9% CAGR over 4y
Location
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Computed from 5 filingsProvides marketing services for B2B and B2C brands, including brand strategy and identity, digital marketing campaigns, paid advertising, social media and email marketing, creative content…
Serves marketing and brand teams in B2B and B2C organisations, including consumer brands, travel companies and public-sector economic development bodies with UK, European and international audiences.
Financial Health
HealthyHealthy · Hiring · 18% CAGR over 4y
Location
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Computed from 5 filingsProvides digital marketing and public relations services including SEO, digital PR, content marketing and multi‑channel campaign strategy. Works with businesses and technology companies to launch…
Serves B2B organisations and consumer-facing brands across the UK, EMEA, America and APAC, including enterprise technology firms, B2B software companies, trade brands, automotive businesses and…
Financial Health
StrongStrong · Hiring · 12% CAGR over 5y
Location
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Computed from 3 filingsProvides brand strategy, visual identity design, and creative services for companies and products. Works with global brands on brand development, design systems, campaigns, and digital experiences…
Serves marketing and brand leaders at ambitious businesses, especially global technology, marketplace, travel, wearables and consumer brands, from major enterprises to growth companies across…
Financial Health
HealthyHealthy · -88% CAGR over 2y
Location
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Computed from 5 filingsProvides creative agency services including brand strategy, branding and design, videography and content production, web development, and marketing media. Works with organisations to define…
Serves purpose-driven organisations and brands, including charities, sustainability-focused businesses and event organisers, aiming to positively impact society or the environment.
Financial Health
HealthyHealthy · Hiring · 11% CAGR over 4y
Location
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Computed from 3 filingsProvides creative consultancy services including brand strategy, digital design, and marketing campaign development. Works with organisations to plan and deliver branding, digital experiences, and…
Serves businesses and organisations seeking creative consultancy partnerships, particularly teams responsible for brand, digital and campaign activity.
Financial Health
StableStable · -5% CAGR over 2y
Location
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Computed from 4 filingsProvides strategic creative services including storytelling, content production and experience design for organisations. Develops campaigns, live events and digital experiences used for corporate…
Serves large enterprises and complex organisations, including professional services firms and global consumer brands, especially senior marketing, communications and customer experience teams.
Financial Health
StableStable · -1% CAGR over 3y
Location
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Computed from 5 filingsProvides branding, design and digital marketing services. Develops marketing strategies, advertising campaigns, animations and websites, and produces communication materials such as prospectuses and…
Serves B2B and public-sector clients in education and learning, health, communities and tourism, including councils, health alliances, specialist local businesses and creative-sector brands.
Financial Health
StableStable · 2% CAGR over 5y
Location
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Computed from 3 filingsProvides marketing and creative communications services including branding, design, copywriting, website development, and social media campaigns, with a focus on marketing industrial, commercial, and…
Serves B2B and B2C organisations, primarily industrial and commercial property developers and logistics real estate firms, plus professional services and arts organisations needing marketing support.
Financial Health
WeakWeak · -15% CAGR over 2y
Location
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Computed from 3 filingsProvides brand consultancy and creative agency services including business and brand strategy, brand identity and design, advertising campaigns, social and influencer marketing, and internal…
Sells to established consumer-facing brands seeking brand strategy, identity and campaign support. Appears to target marketing and brand teams at well-known B2C companies, including hospitality and…
Financial Health
WeakWeak · -11% CAGR over 2y
Location
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Computed from 2 filingsProvides web design, branding, website development and digital marketing services. Designs and builds bespoke responsive websites, brand identities and marketing materials, and offers ongoing website…
Serves B2B clients, mainly small and medium-sized organisations needing an external digital design, development, branding and marketing team with ongoing project support.
Financial Health
StrongStrong
Location
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Computed from 2 filingsProvides digital advertising services for ecommerce businesses, managing pay‑per‑click and paid social campaigns on platforms such as Google Ads and Meta. Also offers landing page creation,…
Serves ecommerce businesses, primarily owners and senior leaders, with at least £100k monthly turnover and £20k monthly ad spend, looking to scale Google and Meta advertising and enter new markets.
Financial Health
HealthyHealthy · Hiring · 133% CAGR over 1y
Location
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Computed from 5 filingsProvides brand strategy, creative design, marketing campaign development, and video content production services. Works with organisations in higher education, the public sector, finance, fintech,…
Serves marketing and communications teams in higher education, including universities and colleges, alongside public sector organisations, finance and fintech firms, edtech businesses, and…
Financial Health
StableStable · Hiring · 7% CAGR over 5y
Location
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Computed from 5 filingsProvides property marketing services including branding, CGI visualisations, photography, digital design, websites and interactive tools for real estate developments, helping developers present and…
Serves B2B property developers, housebuilders, housing associations, estate-led residential projects, and interior/property brands, with some private residential clients.
Financial Health
StableStable · Hiring · 24% CAGR over 4y
Location
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Computed from 4 filingsProduces branded video content and marketing campaigns for companies. Services include film and video production, social media content, photography, design and event production, creating promotional…
Serves marketing, brand and communications teams at large consumer, technology, healthcare, ecommerce and entertainment brands, including global enterprises running content-led campaigns.
Financial Health
WeakWeak · -82% CAGR over 3y
Location
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Computed from 5 filingsProvides digital design and development services including brand identity, user experience design, websites, and product development. Works with clients through discovery, design, and development to…
Serves businesses and brands seeking external design and development support, including teams with digital product, website, brand identity and user experience projects across varied industries.
Financial Health
StableStable · Hiring · 22% CAGR over 4y
Location
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Computed from 4 filingsProvides video production and digital development services, including corporate and promotional videography, website design and development, e‑commerce sites, SaaS platforms, and mobile app…
Serves ambitious brands and forward-thinking companies nationwide, including ecommerce, SaaS, healthcare, events, sports, outdoor and luxury lifestyle businesses.
Financial Health
WeakWeak · Hiring · 12% CAGR over 3y
Location
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Computed from 5 filingsProvides creative and digital consultancy services for organisations and brands, including brand strategy, design, digital platform development, and storytelling to support sustainability, social…
Serves impact-focused organisations and progressive brands, including nonprofits, social causes, arts and heritage bodies, climate finance organisations and financial services firms seeking…
Financial Health
StrongStrong · Hiring · 37% CAGR over 4y
Location
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Computed from 5 filingsProvides marketing and public relations services, developing creative communications campaigns, brand storytelling, product launch publicity and media engagement for consumer brands. Works on…
Serves marketing and brand teams at consumer-facing businesses, particularly food and drink, retail, toy, entertainment and related brands seeking creative communications campaigns.
Financial Health
StableStable · Hiring · 10% CAGR over 4y
Location
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Computed from 5 filingsDesigns data-driven visual communications and storytelling for organisations, producing infographics, animations, interactive graphics and installations that present complex data in visual formats…
Serves global brands, startups and advertising agencies, including clients in finance, healthcare, consulting and public health sectors.
Financial Health
StrongStrong · Growing, Hiring · 7% CAGR over 4y
Location
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Computed from 5 filingsProvides brand communications and design services including brand research, strategy development, naming, visual identity design, and website design. Works with organisations to develop branding…
Serves businesses, charities and community organisations needing brand and marketing support, including technology, healthcare/pharma, retail, membership and public-facing organisations.
Financial Health
StrongStrong · Growing, Hiring · 37% CAGR over 4y
Location
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Computed from 5 filingsProvides brand strategy, visual identity design and creative consultancy services. Develops brand concepts, naming and design systems, and produces marketing and experiential projects, including…
Serves B2B innovators, entrepreneurs and brand-led organisations, including wellness companies, property developers, workplace designers, flexible workspace operators and destination/leisure brands.
Financial Health
HealthyHealthy · -68% CAGR over 4y
Location
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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
Location
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Computed from 2 filingsProvides creative communications services, helping organisations develop and deliver messaging and content to communicate with audiences and stakeholders across different digital and other media…
Financial Health
WeakWeak · -7% CAGR over 1y
Location
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Provides marketing and communications services through a global network of agencies, including advertising creative, media planning and buying, digital transformation, data and consumer research,…
Serves ambitious B2C, B2B and direct-to-consumer brands, as well as modern businesses and political organizations, with a global client base.
Financial Health
N/AN/A
Location
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Computed from 5 filingsProvides brand strategy, creative direction and advertising campaign development for consumer brands. Produces marketing concepts, visual identity work and promotional content for sports, fashion,…
Serves marketing and brand teams at consumer-facing brands, particularly in sport, fashion, fitness, automotive and entertainment, including global brands, rights holders and talent-led campaigns.
Financial Health
StableStable · Hiring · 38% CAGR over 4y
Location
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Computed from 3 filingsProvides creative agency services including brand development, campaign concepts, and digital content for entertainment, gaming, and technology brands, producing marketing campaigns, visual identity…
Targets B2B clients in gaming and entertainment, including video game publishers, console/platform brands and adjacent technology brands such as Minecraft, Xbox, EA SPORTS and Bethesda.
Financial Health
StrongStrong · Hiring · 192% CAGR over 2y
Location
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How Sanity usage is detected
Company data
Detected companies are joined to UK Companies House records and XBRL accounts data. 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.
Detection
Firmbase crawls the public website of actively-trading UK companies and fingerprints the technologies present: tracking scripts, embedded forms, chat widgets, CMS markers and similar signatures. A company is included in this list when one or more of the technology's signatures are found on its site; closely-related variants of the same product are grouped under one name. Detection covers what is visible on the public web — a company using the technology purely internally, with no website footprint, will not appear. Counts are therefore a conservative floor, not a ceiling. marketing agency companies are identified using Firmbase's semantic classification of company activity, built from filings, websites and registered SIC codes rather than SIC codes alone. The detected counts and share figures on this page are computed within that sector cohort, so "share" always means share of marketing agency companies with a detectable system — not of all UK companies.
Freshness
Websites are re-crawled on a rolling basis and the underlying company data is refreshed from Companies House continuously; filings appear within days of submission. The list and its statistics are regenerated when the detected cohort moves meaningfully. You can see the last-updated timestamp near the top of the page.
Sanity is a trademark of its respective owner. Firmbase is not affiliated with, sponsored by, or endorsed by the trademark owner.
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Frequently asked questions
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