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Marketing Companies in Cardiff: 609 Active Firms (2026)
Marketing companies in Cardiff plan, create and optimise campaigns for organisations across the surrounding metropolitan economy.
Buying centres tend to sit with communications, revenue, policy and customer-acquisition teams rather than a single technical buyer. Cardiff providers usually split across strategy, creative production, paid and organic search, social, content, media planning, direct marketing and analytics. The customer base is mixed: business clients, public-sector bodies and consumer-facing organisations in Wales, the wider UK and overseas markets. Engagements usually look like agency retainers, campaign packages and specialist project work, with small specialist teams at one end and higher-turnover mid-sized employers at the other.
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Cardiff has 609 actively trading marketing companies, giving the city a visible agency base within Wales rather than just a handful of local suppliers. Employment reporting is concentrated in a narrower group: across 127 firms with declared headcount, reported employment totals 824. That pattern fits a market shaped by owner-managed agencies and small specialist teams, with a smaller layer of employers able to support media, creative, analytics and account-management functions under one roof.
Campaign agencies in Cardiff work without a single sector licence, but their outputs sit across several UK rulebooks. The ICO governs personal data use and PECR obligations for direct marketing; the ASA enforces the CAP Code for advertisers, agencies and media; the CMA and trading standards enforce unfair-trading rules; and Ofcom is relevant where misuse of public electronic communications networks is at issue. With UK ad budgets tilted towards online formats and search, governance around consent, claims, targeting and measurement is a practical market constraint, not just a legal footnote. The DMA code adds a trade-body standard for members involved in direct marketing.
Cardiff’s marketing-agency base appears likely to keep fragmenting by channel and buyer need, rather than converging around a small set of full-service suppliers. Newer firms tend to form around search, social, content and analytics, while higher-turnover agencies are better placed to absorb procurement, privacy and evidence-of-performance demands. Public-sector and regulated-client work may favour agencies with clearer consent management and audit trails, while consumer-facing clients keep pressure on creative output and media efficiency. Acquisition appetite is likely to be selective, because the local market contains many specialist teams but fewer obvious scale platforms.
609
Active firms
2026
4
Above £5M
turnover
169
New since 2022
incorporations
Key facts
About 1% of the trading cohort reports turnover above £5M (4 of 609 firms) — the rest sits below that revenue band.
27% of the cohort was incorporated since 2022 (169 firms), so a sizeable share is in its first few filing cycles.
UK ad spend reached £42.6 billion in 2024, up 10.4%, with online formats growing 13.2% that year.
£4 in every £5 of UK ad budgets was spent online in 2024, and search reached £16.9 billion.
Direct marketing sits under ICO data-protection and PECR rules; Ofcom, the CMA, trading standards and the ASA also appear where campaigns touch networks, unfair trading or advertising standards.
The CAP Code applies to advertisers, agencies and media, while the DMA code is mandatory for DMA members.
OECD data placed the UK second behind the US for advertising, marketing and polling services exports in 2020.
Top Cardiff Marketing companies
WORKING WORD PUBLIC RELATIONS TRADING AS WORKING WORD LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides public relations and communications services including campaign strategy, media relations, film and video production, digital marketing, media buying, brand development, and content…
Serves organisations in Wales and internationally that need to reach public audiences, including clients requiring bilingual English/Welsh communications.
Financial Health
WeakWeak · -68% CAGR over 4y
Location
RAGLAN HOUSE HOLDINGS LIMITED
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsProvides public relations and marketing services including communications and marketing strategy, digital marketing, branding and design, event management, content and video production, advertising,…
Serves B2B, public sector and not-for-profit clients, including healthcare, professional services, legal, education, trade union, membership, transport and energy organisations.
Financial Health
WeakWeak · -19% CAGR over 1y
Location
COWSHED COMMUNICATION LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides communications and marketing services, developing integrated campaigns including research, strategy, creative development and production. Works with public sector bodies, charities and…
Serves public sector bodies, charities, healthcare organisations and cause-led businesses in Wales, including government, NHS, social care, community, retail and music-sector clients.
Financial Health
HealthyHealthy · Hiring · 10% CAGR over 4y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides marketing and communications services including social media management, PR, paid social advertising, creative content production, marketing strategy, influencer campaigns, events, and…
Serves Welsh and Cardiff-based brands and organisations, including cultural venues, sports clubs, hospitality groups, retailers, professional services firms and event organisers.
Financial Health
StrongStrong · Hiring · 57% CAGR over 4y
Location
YOGI COMMUNICATIONS LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides marketing and creative services including graphic design, branding, website design and development, video production, social media management, copywriting, and digital marketing campaigns…
Serves public-sector bodies and private-sector organisations needing creative marketing support, including education, cultural, environmental, healthcare and hospitality clients.
Financial Health
HealthyHealthy · -7% CAGR over 4y
Location
ORCHARD MEDIA AND EVENTS GROUP INVESTMENTS LTD
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsProvides integrated marketing and communications services including branding, content marketing, strategic communications, video production and events management. Develops campaigns, creative…
Serves businesses, public bodies and organisations, targeting brand, communications, events and content teams with creative or commercial campaign briefs.
Financial Health
StableStable · 7% CAGR over 1y
Location
Provides print production, direct mail, and digital communications services. Offers lithographic and digital printing, personalised print, document packs, hybrid mail, email and SMS distribution,…
Serves major UK brands and public-sector organisations needing customer communications, across financial services, education, healthcare, retail, government and utilities.
Location
Lynn Group Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides communications consultancy using behavioural science to design social and behaviour change campaigns. Conducts audience research, develops creative campaign assets, and advises organisations…
Serves public sector bodies, NHS organisations, local and national government, NGOs, companies and brands needing behaviour-change and misinformation-related communications support.
Financial Health
DistressedDistressed · -45% CAGR over 2y
Location
We Are Propeller Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides digital agency services including digital strategy, website design and development, UX/UI design, conversion rate optimisation, SEO, paid media, and social media marketing, helping brands…
Serves B2B consumer-facing brands, especially in hospitality, travel, food and drink, and entertainment, targeting marketing and digital leaders seeking growth in online engagement and conversions.
Financial Health
WeakWeak
Location
Liberty Marketing Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides digital marketing services including search engine optimisation, pay‑per‑click advertising management, paid social and display advertising, content marketing, digital PR, social media…
Serves businesses and brands needing digital marketing support, including retailers, hospitality groups and manufacturers, with buyers likely to be marketing teams or business leaders seeking growth,…
Financial Health
HealthyHealthy · -4% CAGR over 4y
Location
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides creative communications and public relations services including research and insights, strategy development, creative campaigns, press office support, content production, newsjacking and…
Serves brands and public-sector organisations, targeting marketing and communications teams that need to engage diverse, underrepresented or global audiences and improve representation in their…
Financial Health
StableStable · 0% CAGR over 3y
Location
Savage & Gray Design Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides graphic design, branding and digital media services. Designs and develops WordPress websites, produces animated explainer videos and marketing graphics, and creates visual identities,…
Serves businesses, public sector bodies, universities, healthcare organisations, cultural venues and events across Wales and the UK, typically teams commissioning brand, web, graphic design or…
Financial Health
StableStable · 0% CAGR over 4y
Location
Blue Stag Studio Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides branding, design and communications services for charities, public sector bodies and mission‑driven organisations. Develops campaigns, visual identities, digital content and storytelling…
Serves purpose-led organisations, charities, social impact bodies and public sector teams, including healthcare, policing, education, entrepreneurship and sustainability organisations seeking to…
Financial Health
StrongStrong · Hiring · 7% CAGR over 4y
Location
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsProvides marketing and branding agency services including brand strategy, communications, creative production, and event and experiential marketing. Works with sports, lifestyle and imaging brands to…
Serves global and international brands in sports, lifestyle, photography/imaging and related consumer products, working with marketing and brand teams seeking long-term agency support.
Financial Health
StableStable · 0% CAGR over 3y
Location
Celf Creative Design Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides branding and design services including brand strategy, campaign and packaging design, web design and development, e‑commerce, digital marketing and SEO. Also produces 3D/2D animation, CGI…
Serves businesses and charities, with sector focus on charitable organisations, medical companies, property and real estate firms, product packaging brands and sports organisations.
Financial Health
StrongStrong · Growing, Hiring · 7% CAGR over 4y
Location
VENOM PROMOTIONS LTD
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides PR and influencer marketing services, developing digital campaigns that connect brands with social media creators and audiences. Services include campaign strategy, influencer partnerships,…
Serves B2B brands and marketing teams, from innovative start-ups to global enterprises, across industries seeking PR and influencer marketing support.
Financial Health
StrongStrong
Location
C K Communications Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides public relations and communications services including media relations, crisis communications, reputation management, press release production, social media management, and marketing…
Serves private sector companies, not-for-profits and major public institutions, targeting brand, marketing, corporate communications and PR leaders managing public reputation and media relationships.
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
CAZBAH LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides marketing and event management services, including planning and delivery of conferences and roadshows, market research and evaluation, graphic and web design, digital marketing, PR support,…
Serves public, private and voluntary sector organisations in Wales, including utilities, enterprise support programmes, technology and innovation bodies, education networks, start-ups and event…
Financial Health
HealthyHealthy · -67% CAGR over 4y
Location
DESIGN SPECIALISTS (THE TEAM WORKS) LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides branding, graphic design and marketing communications services, including digital design, publishing and event support, for organisations in the science, technology and innovation sectors,…
Serves B2B and public sector organisations in the science, technology, health, life sciences and innovation sectors, including medical companies, industry networks, health technology bodies and…
Financial Health
HealthyHealthy · -4% CAGR over 4y
Location
CAFFEINE MARKETING LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides B2B growth marketing services including demand generation, account‑based marketing, SEO, website copywriting and Webflow design, and go‑to‑market messaging and strategy. Works with companies…
Targets marketing and sales leaders at emerging, mid-market and enterprise B2B companies with long sales cycles and goals for qualified leads, pipeline and revenue.
Financial Health
StableStable · 0% CAGR over 2y
Location
Web Box Cardiff Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides website design and development, web applications, and ongoing website support. Delivers digital marketing services including PPC, paid social, SEO and campaign management, alongside…
Targets B2B organisations in health, leisure and tourism, and sport, including care providers, sports bodies, tourism operators and leisure businesses seeking agency support.
Financial Health
HealthyHealthy · -3% CAGR over 4y
Location
Grasshopper Communications Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides public relations and strategic communications services including stakeholder and community engagement, consultation campaigns, and communications strategy for organisations involved in…
Serves organisations running infrastructure, housing, energy, environmental and public policy projects, including public bodies and private developers needing community engagement.
Financial Health
StrongStrong · Hiring · 27% CAGR over 4y
Location
Pobl Tech Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides digital design, web and software development, and digital marketing services, creating and managing websites, digital products, and online campaigns for organisations using a user‑centred…
Serves organisations rather than consumers, targeting business or nonprofit clients that need external digital agency support, including those requiring bilingual Welsh/English communications.
Financial Health
StrongStrong
Location
Route Sales & Media Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides out-of-home advertising services, supplying and managing roadside billboards, retail and rail screens, bus advertising, event screens and mobile digital vans. Also offers programmatic DOOH…
Serves B2B advertisers, brands, retailers and marketing teams seeking to reach consumers in high-footfall rail, retail, roadside, bus and event environments across the UK.
Financial Health
StableStable · -79% CAGR over 3y
Location
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsProvides branding and graphic design, website development and WordPress hosting, digital marketing and SEO, copywriting, and multimedia production. Also produces signage, vehicle and wall wraps,…
Sells to businesses and organisations needing branding and marketing support, including local SMEs, real estate firms, retirement communities, farms and other community-based organisations. Targets…
Financial Health
StableStable · -36% CAGR over 1y
Location
Yard Associates Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides marketing technology and digital analytics consulting, specialising in Adobe Analytics implementations. Supports organisations with data collection, customer behaviour analysis, audience…
Serves B2B marketing, digital and analytics teams at mid-market and enterprise organisations, including financial services, utilities, telecoms, retail and ecommerce brands using MarTech platforms.
Financial Health
DistressedDistressed · -18% CAGR over 4y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides social media community management and customer service for brands, handling messages, comments and complaints across social platforms. Also offers review management, social listening, live…
Serves B2B clients, mainly established UK consumer brands in restaurants, hospitality, e-commerce, non-profit, property, food and drink, and automotive sectors that manage high volumes of customer…
Financial Health
HealthyHealthy · -67% CAGR over 4y
Location
Lab Class Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProduces video content for brands and organisations, including brand films, advertising campaigns, animations, motion graphics and VR experiences. Provides creative video production services from…
Sells to marketing and communications teams at B2B and consumer brands, including fashion retailers, ecommerce sellers, media organisations, employers and charities.
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides culture marketing and brand partnership services. Develops brand strategies, collaborations and promotional activations, working with entertainment companies, IP owners and creators to…
Serves B2B brand owners and IP owners, including iconic consumer brands, commoditised category brands, fast-growth challengers, entertainment companies, licence holders, talent and creators seeking…
Financial Health
DistressedDistressed
Location
Webspection Ltd
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
HQ SEO LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides technical search engine optimisation (SEO) and digital marketing services, including website audits, on‑page optimisation, and search performance improvements aimed at increasing website…
Serves UK businesses seeking technical SEO and ROI-focused digital marketing support, including marketing teams and business owners across sectors.
Financial Health
WeakWeak · -9% CAGR over 3y
Location
INFINITY NATIONAL LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides digital marketing and e‑commerce growth services including SEO, PPC advertising, paid media management, UX and conversion rate optimisation, email marketing, consultancy, and digital due…
Serves eCommerce businesses, online retailers and consumer brands seeking digital growth, alongside investors or portfolio owners needing digital due diligence across acquisition or growth decisions.
Financial Health
HealthyHealthy · -65% CAGR over 4y
Location
PINNACLE INTERNET MARKETING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides digital marketing services including search engine optimisation (SEO), generative engine optimisation for AI search tools, pay‑per‑click advertising, social media and video marketing, and…
Serves businesses of all sizes seeking digital marketing support, including SEO, PPC, web design, social media, and related online growth services.
Financial Health
WeakWeak · -10% CAGR over 4y
Location
WLP
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides creative production services for marketing content, managing organisation, localisation and delivery of campaigns, assets and materials across multiple formats, languages and territories for…
Serves businesses and marketing teams that need to adapt and deliver content, services and products across multiple languages, formats, territories and audiences.
Financial Health
StableStable
Location
ROCKADOVE LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides video production services for businesses and agencies, creating film, animation and motion graphics. Produces promotional, marketing and branded video content and works with digital and…
Serves businesses, public sector bodies, universities and healthcare organisations, and works with digital and advertising agencies as a production partner for clients in the UK and globally.
Financial Health
WeakWeak · -6% CAGR over 4y
Location
Storm and Shelter Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProduces commercial films and branded video content for brands and agencies. Services include concept development, directing, filming and post‑production for advertising campaigns, promotional videos…
Serves brands and advertising or marketing agencies commissioning commercial, explainer and branded video content for campaigns, education and audience engagement.
Financial Health
HealthyHealthy · -5% CAGR over 4y
Location
Trajectory
1y · 2024–NowProvides software and digital services including custom web and mobile application development, UI/UX design, branding, SEO, digital marketing, and automation bot development for startups and…
Serves B2B clients, particularly startups, technology companies and enterprises, including both local and international organisations looking to develop or improve digital products and online…
Financial Health
Insufficient historyInsufficient history
Location
Brollies And Parasols Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StrongStrong · Hiring · 14% CAGR over 3y
Location
Limegreentangerine Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides branding, brand strategy, graphic design and website design services for businesses. Develops visual identities, brand assets and digital experiences, and designs and builds websites to…
Serves businesses and organisations seeking brand and digital design support, including hospitality venues, drinks producers, sports bodies and consumer brands.
Financial Health
WeakWeak · -4% CAGR over 2y
Location
JADEITE MARKETING LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
DistressedDistressed · 0% CAGR over 1y
Location
Visaura Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides performance advertising creative services, producing digital advertising content for brands. Engages creators and models to develop marketing materials and supports social media advertising…
Sells to businesses buying advertising services, particularly brands using social media performance marketing. Also engages creators, models and agencies as supply-side participants in producing ad…
Financial Health
StrongStrong · Growing, Hiring · 71% CAGR over 4y
Location
Journolink Ltd
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsCurates and packages journalistic-style articles and editorial content for use in marketing and communications campaigns, supplying branded content materials for businesses, organisations and media…
Financial Health
WeakWeak · Hiring · 11% CAGR over 4y
Location
MARTIN HOPKINS PARTNERSHIP LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides brand design, branding strategy, and website design services. Designs and builds custom websites, develops visual identities, and produces digital marketing assets including social media…
Serves businesses and consumer-facing brands nationwide, including coffee shops, wellbeing organisations, storage providers and sustainable product companies, typically marketing or business owners.
Financial Health
WeakWeak · -30% CAGR over 1y
Location
CIVICEDGE LTD
Trajectory
1y · 2024–NowProvides public relations and strategic communications services, including community engagement, messaging development, media relations, and event planning. Works with organisations to communicate…
Serves public-sector agencies, civic institutions, and community-focused organizations managing policy, program, or community initiatives that involve residents and stakeholders.
Financial Health
Insufficient historyInsufficient history
Location
RELISH DESIGN LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
WeakWeak · 0% CAGR over 2y
Location
MARK FINCH COPYWRITER LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
SUGAR CREATIVE STUDIO LIMITED
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsDevelops immersive digital experiences using augmented and virtual reality and spatial computing. Produces mobile apps, interactive storytelling platforms, location‑based XR installations and AR…
Serves global brands, entertainment and IP owners, tourism and cultural organisations, museums, sports bodies, public-sector partners and startups commissioning immersive AR/VR audience experiences.
Financial Health
WeakWeak · -5% CAGR over 3y
Location
DO! DESIGN AND VISUALS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides digital creative services including 3D visualisation, CGI, animation and interactive experiences. Designs marketing content, brand identities, websites and UI/UX, and develops virtual tours,…
Serves B2B clients including designers, architects, property marketers, agencies and organisations, with examples across property, interiors, hospitality, workplace products and public consultation.
Financial Health
StableStable · Hiring · 3% CAGR over 4y
Location
ALCHEMY EXPO LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides design, production and build services for exhibitions, business events, hospitality and retail environments. Offers print and graphic design, digital integration, fabrication and…
Serves B2B clients in business events, hospitality and retail, including organisations needing exhibition, branded environment or display projects.
Financial Health
HealthyHealthy · Growing, Hiring · 5% CAGR over 3y
Location
Elevator Design Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
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How Cardiff Marketing companies work and how to sell to them
What they do
Revenue usually comes from retained advisory and delivery work rather than one-off software licences. Cardiff marketing agencies typically price ongoing planning, content, search, social and analytics work as monthly retainers, with fixed-fee projects for campaign launches, creative production and research-led strategy. Some add media planning and buying fees, or pass through media costs with a margin, while performance-linked fees appear where attribution is clear enough for both sides. The product is mostly labour, process and accumulated know-how: briefs, creative assets, campaign calendars, reporting dashboards and account management, wrapped into a service model that clients can adjust by channel.
Who they sell to
Buyers usually sit in marketing, communications, ecommerce, policy, customer-acquisition or revenue teams, with smaller clients often involving founders or managing directors. Mid-market and public-sector buyers tend to add procurement, finance and legal review once a brief involves media spend, personal data or public-facing claims. Private-sector work is often won through direct sales, referrals, credentials meetings and competitive pitches; public-sector work more often arrives through frameworks, written briefs and formal tendering. Sales cycles range from short project approvals to longer retainer reviews, with trust, sector familiarity and evidence of campaign outcomes carrying more weight than technical feature comparisons.
What they buy
Most Cardiff marketing firms tend to spend on tools and services that protect billable time, client reporting and campaign governance. Common categories include CRM, proposal software, project management, time-recording, billing, finance, HR, recruitment, cyber security, cloud storage, marketing automation, search and social management, analytics, attribution and consent management. Agencies with public-sector or regulated clients are likelier to need legal advice, data protection support, insurance, accessibility testing and audit trails for approvals. Many also buy freelance creative, copywriting, development and media support when client demand is uneven, because permanent headcount can be hard to match to campaign cycles.
Why and how to sell to them
Marketing buyers tend to evaluate vendors when margin, retention or compliance pressure becomes visible. Triggers include a larger retainer win, a move into public-sector tendering, a senior account or operations hire, a spike in freelance use, new reporting requirements from clients, or a consent and privacy review after a campaign changes channel mix. Outbound messages usually land better when they connect to billable utilisation, faster client reporting, cleaner approval trails, lower write-off time or reduced risk under ICO, PECR and ASA rules. Claims about broad efficiency are less useful than a narrow example tied to agency workflow and client proof points.
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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