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Martech Companies in London: 300+ Active Firms (2026)
Martech companies in London build software and data services that help organisations plan, execute, measure, and optimise marketing.
Buying centres split between revenue teams, marketing operations, customer-data owners and digital commerce teams, rather than a single software budget. The London cohort tends to sell into business-facing and consumer-facing commercial teams that already have a defined marketing stack: mid-market firms buying campaign automation or analytics, larger enterprises adding governance and attribution, and specialist agencies operating technology-enabled delivery for clients. Engagements are usually subscription, usage-based or managed-service contracts, with procurement shaped by integration effort, privacy review and the buyer’s tolerance for replacing embedded workflow tools.
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London has 389 actively trading martech companies in this list, giving the city a sizeable but not diffuse specialist market rather than a broad consumer-internet category. Reported employment totals 2,067 people across 120 firms, so the visible employment footprint is concentrated in companies willing or required to report staff numbers. The shape is consistent with a market led by commercial software and data-services businesses: enough firms for buyer choice, but still narrow enough that category specialists, agencies and enterprise marketing teams often know the same supplier groups.
Customer-data and advertising-operations suppliers face a different operating context from content workflow or planning tools. Products that touch identifiers, behavioural targeting, consent, retention or cross-channel measurement tend to encounter longer legal and procurement checks, especially when they sit inside enterprise customer records or sales systems. Market structure also matters: many buyers already run a mixed marketing stack, so replacement decisions often depend less on feature breadth and more on integration cost, attribution confidence and whether teams can reduce overlap across agency, media and software budgets.
Buyer scrutiny appears to be moving towards consolidation, cleaner consent trails and clearer attribution, which favours suppliers that can prove where they sit in the commercial workflow. Early-commercial specialists may still find room in narrow use cases, but procurement tends to reward tools that reduce switching friction rather than add yet more dashboard work. Scale-up scarcity is likely to keep acquisition interest in play, particularly where a product owns a defensible data asset or sits close to revenue operations. For smaller firms, agency partnerships and embedded services may remain a practical route to market.
389
Active firms
2026
43
Over £5M
Revenue threshold
49
Since 2022
New incorporations
Key facts
About 11% of the trading cohort reports turnover above £5M (43 of 389 firms) — the rest sits below that revenue band.
12% of the cohort was incorporated since 2022 (49 firms), so a sizeable share is in its first few filing cycles.
London martech suppliers sit between marketing teams, sales operations and analytics functions, so buying decisions often involve several internal owners.
Common work areas include campaign planning, audience management, attribution, automation and measurement.
Vendor selection tends to turn on workflow fit, integrations and commercial accountability, as marketing spend is managed through systems as well as agencies and media owners.
The segment mixes software-led models, managed data services and marketing operations providers, which makes delivery model an important comparison point.
Top London martech companies
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides a demand-side platform for B2B digital advertising. Uses intent data, IP targeting, and account-based marketing to deliver programmatic display ads to specific companies and decision‑makers…
Serves B2B marketing and sales teams seeking to target business accounts, plus B2B and media agencies. Industry focus includes technology, software, manufacturing, automotive, healthcare, logistics…
Financial Health
StrongStrong
Location
Demandbase Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops a B2B account‑based marketing and sales platform that uses data, intent signals and AI to identify target accounts, deliver targeted advertising, personalise web experiences, and provide…
Sells to B2B go-to-market teams, especially marketing, sales, customer success and revenue operations leaders at enterprise organisations in sectors such as technology, manufacturing, financial…
Financial Health
WeakWeak · Hiring · 35% CAGR over 4y
Location
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides marketing technology through the Mapp Marketing Cloud platform, offering customer data collection and analytics, marketing automation, segmentation, and tools to deliver personalised…
Targets marketing and ecommerce teams at consumer brands, especially retail and fashion businesses; also serves agency, technology and consultancy partners supporting customer engagement programmes.
Financial Health
DistressedDistressed · -90% CAGR over 2y
Location
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsOperates an omnichannel advertising technology platform that connects brands, agencies and publishers. Provides tools for programmatic advertising, audience data activation, mobile app and web…
Sells to B2B media buyers and sellers: brands, agencies, DSPs, publishers and platforms. Targets advertiser teams in brand, performance, CPG and shopper marketing, plus app publishers and…
Financial Health
HealthyHealthy · Hiring · 12% CAGR over 2y
Location
Optimove
Develops customer marketing software that uses data and AI to help businesses analyse customer behaviour, segment audiences, and manage personalised multichannel campaigns across email, SMS, mobile…
Serves B2B marketing teams at brands and operators in iGaming, retail and eCommerce, online trading, social games and apps, financial services, and travel and hospitality.
Financial Health
Insufficient historyInsufficient history
Location
Trajectory
4y · 2020–NowFinancial sub-scores
Computed from 4 filingsDevelops and operates an omnichannel demand‑side advertising platform that enables brands and agencies to plan, buy and measure digital advertising campaigns. Uses mobile app and location‑based data…
Serves B2B customers: brands, advertisers and media agencies managing omnichannel digital campaigns, especially marketing and media-buying teams focused on privacy-first audience activation and…
Financial Health
HealthyHealthy · Hiring · 8% CAGR over 4y
Location
SCREENDRAGON LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops marketing workflow automation software for enterprises and agencies. Platform manages project planning, resource allocation, creative approvals, budgeting and reporting, with AI tools for…
Sells to B2B customers, especially enterprise marketing teams, in-house agencies, and external agencies. Targets operations managers, project leads, and marketing teams at global brands and agencies…
Financial Health
HealthyHealthy · -68% CAGR over 4y
Location
SUB2 TECHNOLOGIES LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDevelops AI-driven customer intelligence and marketing technology platform that analyses real-time behavioural data to predict customer intent, score audiences, and automate targeting and bidding…
Serves B2B marketing teams and brands running digital campaigns, including UK heritage retailers and high-growth challengers, across search, social, email, programmatic and CRM.
Financial Health
StrongStrong · Hiring · 11% CAGR over 5y
Location
RELAY42 UK LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides marketing data management and activation software that connects data from advertising and analytics platforms, stores and transforms datasets, analyzes marketing performance, and enables…
Serves marketing, data and development teams at enterprises, SMBs and agencies, with emphasis on ecommerce/DTC, travel and hospitality, retail/FMCG, and media/publishing brands.
Financial Health
HealthyHealthy · -4% CAGR over 4y
Location
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops software for marketing identity resolution and first‑party data activation. Provides tools to build ID graphs, recognise users across systems in real time, manage consent, and activate…
Serves marketing, data and digital leaders at fast-growing scale-ups and global enterprises with significant customer data, media spend, and CRM/CDP stacks.
Financial Health
HealthyHealthy · Growing · 0% CAGR over 2y
Location
Trajectory
2y · 2019–NowFinancial sub-scores
Computed from 2 filingsProvides a software platform for managing and processing marketing leads and customer data. The system collects leads from multiple channels, validates and transforms data, integrates with marketing…
Serves enterprise-level B2B organisations operating at scale, especially marketing, revenue operations and leadership teams, plus publishers managing lead channels, campaigns and compliance.
Financial Health
StableStable · 5% CAGR over 1y
Location
Automated Creative Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDevelops advertising technology that generates, tags and tests digital ad creatives using live performance data. Platform enables marketers to produce large volumes of ads and analyse results across…
Serves B2B marketing teams, performance marketers and global CMOs at large consumer brands and agencies running paid social, display, video and retail media campaigns across multiple markets.
Financial Health
StrongStrong · Growing, Hiring · 37% CAGR over 4y
Location
EVAM ANALYTICS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops real-time data analytics and customer engagement software. Provides platforms for customer journey orchestration, AI-driven optimisation, and omnichannel messaging including mobile push,…
Sells to enterprise marketing, customer experience and digital engagement teams, mainly in financial services, telecoms, retail and eCommerce, and travel and aviation.
Financial Health
StrongStrong · Growing · 0% CAGR over 2y
Location
TEADS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsOperates a digital advertising platform that delivers and manages campaigns across websites, mobile apps, and connected TV. Provides ad formats, creative production, audience data, and performance…
Serves B2B customers: brand advertisers and marketing teams, plus premium media owners, publishers and OEMs, across open-internet digital advertising channels.
Financial Health
StableStable · Hiring · 5% CAGR over 4y
Location
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides a software platform for managing partnership marketing programmes including affiliates, influencers, creators and customer referrals. Offers tools to recruit partners, track performance and…
Sells B2B to brands, retailers, SaaS companies and publishers running affiliate, influencer, creator, referral and mobile partnership programmes, plus agencies and technology partners supporting them.
Financial Health
StableStable · Hiring · 29% CAGR over 3y
Location
CAMPAIGN MASTER (UK) LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides cloud-based email marketing software including campaign management, automation, CRM and data management tools. Also offers SMS messaging, survey creation, template design, deliverability…
Serves B2B email marketers and marketing teams, from sole traders and small businesses to multinational corporations, needing online marketing, CRM, survey and SMS campaign tools or outsourced…
Financial Health
WeakWeak · -69% CAGR over 4y
Location
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides a data platform for digital marketers and advertisers to collect, connect and manage customer data, build and enrich audience segments, resolve identities across devices, and activate…
Serves B2B digital marketers, advertising agencies, brands, and media/data owners needing audience data, identity, targeting, data collaboration, and monetisation across adtech, CTV, social, and…
Financial Health
HealthyHealthy · 0% CAGR over 3y
Location
SKITTLE DIGITAL LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops and provides a marketing automation and customer data platform for B2C organisations. Software integrates customer data, builds audience segments, and manages multichannel campaigns…
Serves B2C marketing teams at ecommerce retailers, travel, hospitality and transport firms, sports clubs, car dealerships, charities, museums, attractions, and further or higher education providers.
Financial Health
StrongStrong
Location
Segmentstream Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDevelops marketing measurement and optimisation software that analyses advertising performance across channels. Provides attribution modelling, incrementality testing, predictive lead scoring,…
Serves growth and performance marketing leaders at brands and agencies investing in paid media, including DTC/ecommerce advertisers and teams managing cross-channel ad budgets.
Financial Health
DistressedDistressed · -26% CAGR over 3y
Location
Intentsify
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides a B2B intent data and marketing activation platform that analyses online research signals to identify in‑market accounts and buying groups. Delivers audience targeting, digital advertising…
Serves B2B marketing, sales and go-to-market teams, plus agencies, at companies running account-based demand generation, digital advertising and lead generation programmes focused on in-market buying…
Financial Health
StrongStrong · Hiring · 111% CAGR over 3y
Location
TAPCLICKS UK LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDevelops marketing operations and analytics software that aggregates data from advertising and marketing platforms, generates dashboards and automated reports, and manages campaign orders, workflows,…
Sells B2B to marketing agencies, media companies, consumer brands, e-commerce businesses, franchises and healthcare marketers managing client campaigns and marketing operations.
Financial Health
StrongStrong · Hiring · 14% CAGR over 4y
Location
ILLUMA TECHNOLOGY LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDevelops contextual AI technology for digital advertising. Provides tools that classify and analyse online content and bidstream signals to enable cookie‑free ad targeting, campaign optimisation, and…
Serves enterprise brands, media agencies, broadcasters, publishers, online platforms and adtech partners involved in digital, programmatic and CTV advertising.
Financial Health
HealthyHealthy · -54% CAGR over 5y
Location
AudienceProject UK Ltd
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsProvides a SaaS audience measurement platform for advertisers, agencies and publishers to analyse advertising campaign performance across channels including web, social media, online video, connected…
Serves advertisers, media agencies and publishers that run or sell multichannel ad campaigns across web, social, video, CTV and TV, especially teams needing independent audience measurement and…
Financial Health
StrongStrong · Hiring · 36% CAGR over 3y
Location
Trajectory
5y · 2021–NowDevelops a customer data platform that collects, unifies and enriches customer data from multiple sources. Provides tools for identity resolution, audience segmentation, analytics, and activation…
Serves enterprise brands and their marketing, IT and data teams, particularly in retail, telecoms and media, sports, entertainment, gaming and financial services.
Financial Health
Insufficient historyInsufficient history
Location
Develops AI-driven advertising technology that analyses live online intent signals to build audience segments and deliver targeted digital advertising campaigns. Its platform provides ID-free…
Serves B2B advertisers, brands, agencies and programmatic media teams seeking privacy-first digital targeting. Targets marketers running display, video and CTV campaigns across multiple markets,…
Financial Health
Insufficient historyInsufficient history
Location
OMETRIA LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops customer data and marketing automation software for online retailers. Platform ingests and unifies ecommerce, website and store data to create customer profiles, analytics, segmentation and…
Serves B2B retail brands and online retailers, targeting ecommerce, CRM, retention and marketing teams responsible for customer data, loyalty and cross-channel customer engagement.
Financial Health
WeakWeak · 0% CAGR over 4y
Location
REDMILL SOLUTIONS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops media data management and analytics software for advertisers and agencies. Provides a cloud‑based platform that aggregates global media spend data and supports media planning, campaign…
Serves global and multi-market advertisers, brand marketing and media teams, and their agencies managing complex media budgets, campaign data and reporting across countries and brands.
Financial Health
DistressedDistressed · -67% CAGR over 4y
Location
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDevelops customer journey management and customer experience software that collects and analyses customer data, maps customer journeys, measures sentiment, and enables businesses to trigger…
Serves enterprise and mid-market businesses worldwide, especially customer experience, digital, marketing and revenue teams in sectors such as financial services and telecoms.
Financial Health
HealthyHealthy
Location
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides programmatic advertising technology and services including high‑impact display and video ad formats, creative production, campaign management, and attention measurement tools that help…
Serves B2B customers in digital advertising, including brands, media agencies and advertisers running programmatic campaigns, plus publishers seeking premium demand, audience attention insights and…
Financial Health
HealthyHealthy · Hiring · 39% CAGR over 3y
Location
Mass Analytics Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDevelops cloud-based marketing analytics software for marketing mix modeling. Provides a platform that integrates marketing and sales data, builds statistical models, and generates insights and…
Serves B2B marketing effectiveness, analytics and finance leaders at brands and agencies, with emphasis on CPG, retail and financial services organisations seeking marketing measurement capability.
Financial Health
StableStable · Hiring · 25% CAGR over 5y
Location
Trajectory
2y · 2020–NowFinancial sub-scores
Computed from 2 filingsProvides a B2B sales intelligence platform offering databases of company and decision‑maker contact information, including verified emails and mobile numbers. Supplies prospecting data, intent…
Serves B2B sales, marketing and RevOps teams at SMB, mid-market and enterprise companies, especially organisations prospecting to decision-makers across the UK, EMEA and global markets.
Financial Health
StrongStrong · Growing, Hiring · 39% CAGR over 1y
Location
EPISERVER UK LIMITED (FORMERLY KNOWN AS PEERIUS LIMITED)
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsDevelops digital experience software for marketing and product teams, including content management, A/B testing, personalization, experimentation analytics, and ecommerce tools. Platform uses AI to…
Sells to B2B marketing, digital experience, ecommerce and product teams, including marketers, developers, engineers and digital leaders seeking platforms to manage and optimise customer-facing…
Financial Health
StableStable · Hiring · 38% CAGR over 6y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops customer engagement and marketing automation software that enables brands to analyse consumer behaviour and send targeted messages across email, SMS, WhatsApp, mobile apps and web,…
Sells to B2C brands’ marketing teams, especially direct-to-consumer and lifecycle marketers in retail and ecommerce, media and entertainment, travel and hospitality, and financial services seeking…
Financial Health
DistressedDistressed · -24% CAGR over 4y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides a B2B social media management and analytics platform. Tools support publishing, social listening, employee advocacy, and performance measurement, with integrations to CRM and marketing…
Serves B2B marketing, sales/revenue and HR teams at data-driven organisations, especially in tech/software, business services, legal services and manufacturing, with a global customer base of B2B…
Financial Health
HealthyHealthy · Hiring · 35% CAGR over 4y
Location
StackAdapt UK Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsProvides a programmatic advertising platform that enables agencies and brands to plan, buy, and optimise digital ad campaigns. Offers AI‑driven targeting, campaign management and analytics across…
Serves advertising agencies, brands and in-house digital marketing teams running programmatic campaigns, across sectors including B2B, political, retail, travel, healthcare, finance and regulated…
Financial Health
StrongStrong · Growing, Hiring · 52% CAGR over 4y
Location
BUYAPOWA LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides a software platform for referral and reward marketing programmes. Enables businesses to run customer, employee, partner and influencer referral campaigns with tracking, automated reward…
Sells to enterprise brands in complex B2C and B2B markets, including telecoms, broadband, financial services, credit unions, insurance, energy, gaming, betting, lottery, and subscription TV or…
Financial Health
WeakWeak · 1% CAGR over 3y
Location
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsProvides a marketing collaboration software platform that integrates digital asset management, product information management, creative automation, project and task management, online proofing,…
Sells B2B to marketing, product and creative operations teams across multiple markets, retail networks, brands and agencies, including organisations working with in-house, external or hybrid teams.
Financial Health
StableStable · -18% CAGR over 3y
Location
Mparticle Limited
Trajectory
4y · 2019–NowFinancial sub-scores
Computed from 4 filingsProvides a customer data platform that collects, unifies and processes customer data from multiple digital sources, enabling businesses to build customer profiles, analyse behaviour, and activate…
Serves B2C multi-channel consumer brands, including ecommerce, media, fintech and subscription businesses, targeting marketing, product, CRM and data teams managing large-scale customer engagement.
Financial Health
StrongStrong · Hiring · 41% CAGR over 3y
Location
Azerion UK Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops and operates digital advertising technology platforms that connect advertisers with online publishers. Provides demand‑side and supply‑side platforms, ad formats, audience data tools, and…
Serves B2B customers: brands and advertising agencies seeking omnichannel digital advertising, plus digital publishers and game/media owners monetising inventory, across Europe and global markets.
Financial Health
StrongStrong · Hiring · 22% CAGR over 4y
Location
APPIER UK CO., LTD.
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops artificial intelligence software platforms for digital marketing and customer engagement. Products include advertising optimisation, personalised messaging, chatbots, and data analytics…
Serves B2B marketing and growth teams at enterprises and digital businesses in e-commerce, retail, finance and insurance, gaming, and automotive sectors.
Financial Health
StrongStrong · Hiring · 19% CAGR over 4y
Location
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDevelops cloud-based digital asset management and brand content software. Platform centralises media assets, provides brand portals, templated content creation, approval workflows, analytics and…
Serves B2B enterprise marketing, brand, HR and agency teams at large, multi-market brands, including automotive, energy, pharma, banking and retail organisations.
Financial Health
HealthyHealthy · Hiring · 11% CAGR over 5y
Location
TELMAR EUROPE LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides marketing analytics and media planning software that analyses consumer, social and media research data to generate audience insights, segmentation and cross‑media campaign planning tools for…
Serves B2B marketing organisations: creative and media agencies, media sales teams, and consumer brands that need audience insight, research, strategy, and cross-media planning support.
Financial Health
WeakWeak · -71% CAGR over 4y
Location
Amplitude Analytics Ltd
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDevelops a digital analytics platform that collects and analyzes user behaviour data from websites and apps, providing product analytics, session replay, heatmaps, A/B testing, and experimentation…
Serves product, data, engineering, marketing and executive teams at startups and enterprises, including financial services, B2B, media, healthcare and ecommerce organisations.
Financial Health
StrongStrong · Hiring · 32% CAGR over 2y
Location
Sprinklr
Develops and provides customer experience management software that integrates social media management, contact centre operations, marketing, customer service, and analytics, enabling businesses to…
Serves large businesses and public sector organisations, targeting marketing, customer service and CX teams in CPG, financial services, government, retail, technology, telecoms, and travel and…
Financial Health
Insufficient historyInsufficient history
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops digital marketing analytics and PPC management software. Platform aggregates data from advertising channels, automates reporting, tracks SEO performance, and provides lead intelligence tools…
Serves B2B customers, mainly digital marketing and PPC agencies, plus ecommerce and other businesses with sales and marketing teams managing paid search, SEO, social advertising, reporting and lead…
Financial Health
HealthyHealthy · Hiring · 16% CAGR over 4y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides software for TV advertising sales and campaign management, enabling broadcasters and networks to plan, forecast and manage cross‑platform ad inventory, audience segments, proposals, booking…
Serves B2B sales-side TV advertising organisations, including TV platforms, broadcasters, networks and programmers, with additional stakeholders such as advertisers, agencies and inventory partners.
Financial Health
HealthyHealthy · -10% CAGR over 4y
Location
Provides a digital marketing and advertising platform for the travel industry. Uses data to help hotels, attractions, and tourism organisations target travellers, run multichannel advertising…
Sells to travel-sector businesses and organisations, including hotels, attractions, destination marketing organisations, tourism boards, airlines, car rental, cruise and online travel brands, as well…
Location
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides a software platform for automotive manufacturers and dealers to capture, validate and manage sales leads from digital marketing channels. Integrates with advertising platforms and CRM…
Serves B2B automotive marketers at vehicle manufacturers, dealer/retailer networks and mobility brands, especially teams responsible for lead generation, paid media, CRM and sales attribution.
Financial Health
StableStable · 0% CAGR over 2y
Location
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDevelops AI-powered software for planning and managing direct mail marketing campaigns. The platform combines property and demographic data with targeting, campaign activation, real-time tracking,…
Serves B2B marketing teams and brands using direct mail, including organisations in property, travel, utilities, senior living, broadband/ISP sectors and charities, primarily targeting UK consumer…
Financial Health
DistressedDistressed · -10% CAGR over 5y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides cloud-based email marketing and transactional email software with drag‑and‑drop design tools, automation, segmentation, A/B testing, analytics, and developer APIs/SMTP services for sending,…
Serves B2B marketing and developer teams at small businesses, technology companies, agencies, enterprises, franchises and real estate firms, plus ecommerce teams using platforms such as Shopify and…
Financial Health
StrongStrong · Hiring · 34% CAGR over 4y
Location
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How London martech companies work and how to sell to them
What they do
London martech firms usually earn revenue by selling software access, data services or managed technology operations to marketing and revenue teams. Subscription pricing is common for campaign, workflow and analytics products, often with seat, contact-volume or channel-usage bands. Advertising-operations and customer-engagement suppliers may add transaction, media-spend or message-volume components, while agency-like operators wrap configuration, migration and reporting into retainers. Offerings therefore range from application software and APIs to technology-enabled services. Margins and delivery expectations differ by model: self-serve tools need low onboarding friction, while enterprise platforms tend to carry more implementation, security review and account management.
Who they sell to
Typical buyers sit in marketing operations, growth, e-commerce, revenue operations, data and IT, with finance and procurement becoming more visible once the tool touches customer records or paid media budgets. Mid-market customers often buy through departmental owners after a trial, pilot or agency recommendation; enterprise customers tend to run cross-functional evaluation with CTO, CISO, legal and procurement involvement. Contract values range from modest departmental subscriptions to larger annual platform agreements, with sales cycles stretching when migration, identity matching or consent controls are material. Direct sales is common for higher-value work, while self-serve and partner-led channels suit narrower workflow tools.
What they buy
Most London martech firms tend to spend on the operating systems around software delivery and customer acquisition rather than only on marketing tooling themselves. Common purchases include CRM, revenue operations systems, subscription billing, product analytics, cloud hosting, data warehouses, integration middleware, security monitoring and privacy tooling. Firms selling managed services also buy project management, capacity planning, QA, client reporting and finance systems. Hiring needs often concentrate on sales, customer success, solutions engineering, data engineering and paid-media specialists. External services are usually practical: legal review for privacy and contracts, accounting for recurring-revenue recognition, recruitment, technical content, demand generation and partner marketing.
Why and how to sell to them
Martech buyers tend to evaluate suppliers when product usage outgrows manual onboarding, when enterprise prospects start asking for security and privacy evidence, or when a new commercial leader tries to improve pipeline visibility. Funding, acquisition interest, a move into regulated customer sectors and expansion outside the UK can all create vendor review moments. Pitches usually land better when they map to measurable friction: shorter implementation time, lower support burden, cleaner consent records, clearer attribution or fewer manual hand-offs between sales, marketing and delivery. Generic growth claims are less useful than evidence that the seller understands embedded stacks, agency influence and procurement anxiety around customer data.
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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