SaaS Companies Using Apollo.io in the UK: 112 Active Firms (2026)
SaaS companies using sales-intelligence tooling sell subscription cloud software while signalling structured outbound growth motions in the UK.
Revenue operations, sales development and commercial leadership are the main buying centres for this stack in SaaS. The software handles prospect discovery, contact enrichment, account prioritisation and outbound workflow, so adoption usually points to a direct sales motion rather than a purely self-serve product-led funnel. In this sector, companies running the technology tend to sell business-to-business subscriptions with enough budget for multi-seat commercial tooling, CRM administration and data-governance checks. It also suggests a team shape in which marketing, sales and customer operations share prospect and account data, rather than keeping pipeline generation as an informal founder network.
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UK adoption remains a narrow slice of SaaS rather than a general default: 112 SaaS companies are actively trading while running this sales-intelligence stack. Reported headcount totals 1,652, so the footprint is visible but still weighted towards smaller commercial teams. In the CRM and sales-operations category, the stack sits second with 19.3% share. By registered region, London accounts for 43.8% of the cohort, followed by the South East at 17.9%, the North West at 11.6%, the East of England at 6.3% and Scotland at 4.5%.
Licensing is not the main constraint for most UK SaaS suppliers running sales-intelligence tooling. Exposure more often comes through the ICO’s UK GDPR guidance, the Data Protection Act, cyber-security expectations and contract terms imposed by regulated customers. Prospect enrichment, email sequencing and account scoring all involve personal or business-contact data, so lawful basis, suppression handling and processor controls matter before campaign launch. Market structure also sits in the background: the CMA has examined UK public-cloud infrastructure and found competition concerns, which matters because SaaS delivery and sales tooling both rely on cloud hosting, identity, analytics and data-storage services.
Adoption appears likely to move from standalone prospecting tools towards tighter revenue-operations governance. Early-commercial SaaS firms tend to add sales-intelligence tooling when founder networks stop carrying pipeline, but the next phase is less about volume and more about data quality, consent handling and CRM hygiene. Scale-up users may rationalise overlapping prospecting, analytics and workflow tools as procurement teams push for fewer vendors and clearer audit trails. The stack therefore looks less like a marketing experiment and more like part of the operating layer for direct business sales, provided privacy controls keep pace with outbound ambition.
Adoption by company size
Adoption of Apollo.io rises with company size across the trading UK SaaS companies in this cohort. 0.2% of the 37,913 companies with under 10 employees run Apollo.io (64 detected). 2.2% of the 1,886 companies with 10–50 employees run Apollo.io (41 detected). 1.2% of the 166 companies with over 50 employees run Apollo.io (2 detected). That is a 1% gap between the over 50 employees and under 10 employees bands.
112
Active firms
2026
19.3%
Of detected CRM share
UK SaaS
8
Median headcount
Filed accounts
284
Verified contacts
Across this cohort
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Key facts
About 7% of the trading cohort reports turnover above £5M (8 of 112 firms) — the rest sits below that revenue band.
15% of the cohort was incorporated since 2022 (17 firms), so a sizeable share is in its first few filing cycles.
The profiled sales-intelligence system ranks second by detected CRM share within SaaS, at 19.3% (112) of 581 companies with a detectable system, behind the largest CRM at 44.4% (258).
London accounts for 43.8% (49) of SaaS companies running the profiled sales-intelligence system, ahead of the South East at 17.9% (20) and the North West at 11.6% (13).
Tag-management and web-analytics tools are detected alongside the profiled system in 66.1% (74) and 64.3% (72) of the cohort, respectively.
Content-management and web-infrastructure tools are also detected in 54.5% (61) and 60.7% (68) of the cohort, respectively.
UK SaaS suppliers are not generally licensed as a single sector; exposure usually comes through UK GDPR, the Data Protection Act 2018, cyber security, consumer/contract law and client-sector rules.
Lead generation market share among UK SaaS
Share of the 581 UK SaaS with a detectable system. As of June 2026.
What else do Apollo.io-running SaaS run?
Share of the 112 Apollo.io-running UK companies where each technology was also detected. As of June 2026.
Where Apollo.io SaaS 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.
8
Median headcount
£762K
Median UK turnover
7.1%
Above £5M turnover
17
Incorporated since 2022
284 verified decision-maker contacts
across these 112 companies, with emails available in Firmbase. Filter by role, seniority and stack.
Top UK SaaS using Apollo.io
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.
Provides a data intelligence platform for market research and B2B company analysis. Aggregates global data on companies and decision‑makers, offering tools for company discovery, financial…
Serves B2B organizations including corporates, banks, insurers, governments, dealers, agencies, consultants and system integrators, especially marketing, sales, procurement and M&A teams seeking…
Location
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Financial sub-scores
Computed from 5 filingsProvides cloud communications platforms including CPaaS messaging, voice, video and email APIs, plus contact centre and unified communications services. Offers chatbots, campaign management,…
Serves businesses adopting customer engagement, contact centre and collaboration platforms, including customer experience, IT and workforce teams. Targets organisations needing CPaaS, UCaaS and…
Financial Health
DistressedDistressed · -7% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsDevelops cloud-based customer relationship management (CRM) software for sales and go-to-market teams. Platform provides customizable data models, workflow automation, AI-assisted search and…
Sells to B2B companies’ go-to-market, revenue, sales and business operations teams, especially teams managing customer data, outreach, pipelines and reporting.
Financial Health
StrongStrong · Growing, Hiring · 23% CAGR over 4y
Location
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Financial sub-scores
Computed from 4 filingsProvides email and event marketing automation software for financial services firms, including tools for email campaign creation, personalization and send‑time optimisation, event promotion and…
Serves B2B marketing and sales teams at financial services firms, especially global investment managers, with enterprise security, compliance, CRM integration and client engagement requirements.
Financial Health
StableStable · 3% CAGR over 3y
Location
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Computed from 5 filingsProvides a subscription-based B2B data platform offering verified contact information for decision‑makers in large enterprises and public sector organisations across EMEA. Data is researched in-house…
Sells to B2B sales, marketing and lead generation teams targeting enterprise and public sector organisations across EMEA, especially those needing decision-maker data for large organisations.
Financial Health
DistressedDistressed · -16% CAGR over 4y
Location
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Computed from 5 filingsProvides digital identity verification and compliance software for businesses. Offers KYC, KYB and AML screening, document and face verification, liveness checks, transaction monitoring, and fraud…
Serves B2B organisations with online customer onboarding and compliance needs, including banks, fintechs, crypto exchanges, forex platforms, gaming operators, gig-economy firms, marketplaces and…
Financial Health
StrongStrong
Location
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Computed from 5 filingsDevelops software for managing and automating changes in SAP enterprise systems, including transport and release management, analytics and integrations. Also provides consultancy, implementation,…
Sells to large enterprises running SAP, especially IT, SAP change, transformation and compliance teams managing complex global operations across finance, supply chain, utilities and customer…
Financial Health
StrongStrong · Hiring · 10% CAGR over 5y
Location
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Computed from 3 filingsDevelops a market intelligence platform that scans the internet to identify companies and provide B2B data. Offers sales lead generation tools, CRM data enrichment and refresh services, contact and…
Serves B2B companies, particularly enterprise clients, board-level decision makers, and sales and marketing teams seeking market intelligence, contact data, and lead generation across global markets.
Financial Health
StrongStrong · Hiring · 6% CAGR over 2y
Location
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Computed from 5 filingsDevelops and supplies customer relationship management (CRM) software for sales, marketing, customer support and project management. Provides CRM implementation, hosting, system integrations,…
Serves mid-market B2B organisations, particularly in construction, manufacturing, IT and software, targeting sales, marketing, customer support and project teams.
Financial Health
StableStable · -6% CAGR over 4y
Location
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Develops software for account-based marketing that automates prospect research, personalised outreach and campaign management across email, LinkedIn, landing pages and other channels, helping sales…
Sells to B2B sales, marketing and revenue teams running account-based marketing, inbound nurture, outbound prospecting and partner campaigns across multiple channels.
Financial Health
N/AN/A
Location
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Computed from 5 filingsProvides a cloud-based electronic signature platform for sending, signing and managing digital documents. Includes qualified and advanced eSignatures, identity verification, audit trails, web forms,…
Serves SMEs, enterprises and public sector bodies in regulated UK/EU sectors such as healthcare, government, education, finance and legal, targeting sales, HR, legal, procurement and marketing teams.
Financial Health
WeakWeak · Hiring · 12% CAGR over 4y
Location
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Computed from 5 filingsDevelops advertising technology software providing a self‑serve platform for publishers and media companies to sell and manage digital advertising. Tools support campaign booking, inventory…
Serves B2B publishers, media owners, and brands with advertising inventory, targeting ad sales and operations teams that manage direct campaigns for SMB and enterprise advertisers globally.
Financial Health
WeakWeak · 0% CAGR over 4y
Location
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Computed from 5 filingsProvides B2B data products including intent data, identity resolution, audience segmentation and campaign measurement. Aggregates data from a network of publishers and data providers to help…
Serves B2B sales, marketing and advertising teams, agencies, publishers and data/technology partners running account-based marketing, digital campaigns and campaign measurement.
Financial Health
StableStable · Hiring · 5% CAGR over 5y
Location
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Computed from 3 filingsDevelops cybersecurity software that detects and blocks automated bot traffic targeting websites, APIs and mobile apps. Provides AI‑driven bot protection, threat intelligence and monitoring to…
Serves enterprise businesses with high-traffic websites, APIs and apps, especially retail and eCommerce, media and streaming, telecommunications, travel and hospitality firms, and their security…
Financial Health
WeakWeak · -92% CAGR over 2y
Location
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Computed from 4 filingsDevelops relationship intelligence software that integrates with email, calendar and CRM systems to automatically capture contact interactions, maintain contact data quality, and analyse relationship…
Serves B2B professional services firms, including legal, accounting, consulting and built environment organisations, targeting business development, marketing, partners and fee earners.
Financial Health
DistressedDistressed · -14% CAGR over 3y
Location
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Computed from 5 filingsDevelops and supplies document management software that captures data using OCR, stores and organises files in a centralised repository, and automates document workflows. Includes records management,…
Serves businesses and public-sector organisations in logistics, education, housing, property management, legal, insurance, manufacturing, finance, construction, healthcare, hospitality and…
Financial Health
WeakWeak · -2% CAGR over 4y
Location
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Computed from 5 filingsProvides cloud-based communications and marketing software enabling businesses to send bulk SMS, WhatsApp, RCS and email campaigns, run automated messaging workflows, manage two-way chats, build…
Serves businesses, brands and resellers, especially marketing teams, customer engagement/contact centre teams and developers integrating customer communications APIs.
Financial Health
StableStable · Hiring · 49% CAGR over 5y
Location
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Computed from 5 filingsDevelops and provides hosted software for banks and money transfer operators to run remittance services. Platform supports online and mobile transfers, agent and branch networks, compliance…
Serves banks, money transfer operators and remittance agents running or launching global remittance businesses, including organisations managing agent networks, compliance and cross-border payment…
Financial Health
WeakWeak · Hiring · 4% CAGR over 4y
Location
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Computed from 5 filingsDevelops and supplies core insurance software platforms for insurers, brokers and managing general agents. Products support policy administration, claims management, billing, underwriting,…
Serves B2B insurance organisations, including Lloyd’s and London Market syndicates, carriers, MGAs, brokers, and global insurers needing core operational platforms and market-specific technology.
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 4y
Location
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Computed from 5 filingsDevelops and operates a software platform for customer success teams. The platform centralises customer data, tracks customer health metrics, automates workflows, manages onboarding and post‑sales…
Serves B2B SaaS companies’ customer success and post-sales teams, including executives, CS leaders, CS managers, onboarding, sales, product and customer marketing teams managing high-touch or…
Financial Health
StrongStrong · Growing, Hiring · 46% CAGR over 4y
Location
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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
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Computed from 3 filingsProvides cybersecurity software that uses deception techniques such as decoys and honeypots to detect attackers inside networks. Offers SaaS tools for threat intelligence, IP reputation monitoring,…
Serves B2B cybersecurity buyers, including security operations teams and IT leaders in finance, higher education and manufacturing, plus managed security providers and organisations with complex…
Financial Health
HealthyHealthy · Hiring · 12% CAGR over 2y
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Computed from 3 filingsDevelops field service management software that helps organisations schedule jobs, manage field workers, track assets and fleets via GPS, record timesheets and expenses, and maintain compliance using…
Serves B2B and public-sector organisations with field-based operations, including operations managers, compliance teams, HR, asset coordinators, site leaders and field workers in small businesses…
Financial Health
HealthyHealthy · Growing · 2% CAGR over 2y
Location
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Computed from 5 filingsDevelops and provides an AI-based search intelligence platform for SEO analysis. Tools track keyword rankings, SERP features, brand sentiment, backlinks and site performance, and support competitor…
Serves in-house SEO and digital marketing teams at enterprise brands in retail, gambling, news/media, travel and financial services, plus agencies managing client accounts.
Financial Health
WeakWeak · -2% CAGR over 4y
Location
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Develops governance, risk and compliance (GRC) software that helps organisations manage regulatory compliance, enterprise and IT risk, internal audits, incident reporting, policy management and…
Serves enterprise B2B organisations, especially regulated industries such as banking, healthcare, manufacturing, energy, pharmaceuticals and technology, targeting risk, compliance, ethics, audit and…
Financial Health
N/AN/A
Location
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Computed from 2 filingsDevelops AI software that creates and manages automated “digital workers” to perform business processes such as compliance, finance operations, supply chain tasks and data workflows, with governance…
Serves enterprise teams in regulated and data-heavy industries, including healthcare and life sciences, retail and CPG, financial services, IT and tech, across compliance, procurement, supply chain,…
Financial Health
DistressedDistressed · -27% CAGR over 1y
Location
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Provides technology platforms and data services for securities finance markets, including automated trading for securities lending, repo and collateral, post-trade processing, regulatory reporting,…
Serves financial institutions in the global securities finance market, including agent lenders, broker-dealers, beneficial owners and firms active in securities lending, repo, collateral and swaps…
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Computed from 2 filingsProvides a platform that aggregates data from 150+ providers and AI research agents to identify companies and contacts, enrich CRM records, track buying signals, and automate go‑to‑market workflows…
Serves B2B growth, sales, marketing and GTM operations teams at startups and enterprises, including companies running outbound, ABM, CRM enrichment, inbound and territory-planning workflows.
Financial Health
DistressedDistressed · -25% CAGR over 1y
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Develops an open-source API management platform including an API gateway, event management, access control and developer portal tools. Software enables organisations to design, secure, publish and…
Serves enterprise B2B and public-sector technology teams managing API ecosystems, including organisations in financial services, fintech, insurance, government, travel, hospitality, software and…
Financial Health
N/AN/A
Location
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Computed from 5 filingsDevelops and provides operational resilience software that integrates security risk monitoring, location intelligence, travel risk management, incident and crisis management, and mass notification…
Serves global enterprises, particularly energy, oil and gas, utilities and critical-operations organisations, selling to security, risk, travel safety, crisis management and operational resilience…
Financial Health
StableStable · Hiring · 25% CAGR over 4y
Location
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Computed from 5 filingsDevelops and retails employee communication software for frontline and deskless workforces, providing messaging, shared inbox and SMS chat, forms and checklists, pulse surveys, intranet-style content…
Serves employers with frontline, deskless or hourly workforces, targeting HR, operations, internal communications and location managers responsible for engaging staff across multiple sites, shifts…
Financial Health
DistressedDistressed · -16% CAGR over 4y
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Computed from 3 filingsDevelops industrial data operations software that connects, models and streams data from manufacturing systems and equipment to enterprise and cloud applications, supporting analytics, unified…
Sells to industrial manufacturers and enterprise operations teams pursuing Industry 4.0, including life sciences, regulated manufacturing, OEMs, and companies with plant-floor, cloud, and analytics…
Financial Health
StrongStrong · Growing, Hiring · 80% CAGR over 3y
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Computed from 5 filingsDevelops digital workplace software for retail and operations teams, providing tools for employee communications, workforce scheduling, time and attendance, HR management, compliance audits, activity…
Sells to businesses with operational workforces, especially multi-site retail and store-based organisations. Targets operations, compliance, HR, project and marketing teams needing workforce…
Financial Health
StableStable · -2% CAGR over 4y
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Computed from 5 filingsDevelops software and services for managing indirect taxes. Provides a platform for VAT compliance, e‑invoicing, VAT recovery and cross‑border payment processing, alongside consultancy, VAT…
Serves B2B customers, mainly multinational and multi-jurisdiction businesses, targeting indirect tax, VAT, finance and accounts payable teams responsible for compliance across countries.
Financial Health
HealthyHealthy · -4% CAGR over 4y
Location
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Computed from 4 filingsProvides ESG management software that enables companies and fund managers to collect, manage and report environmental, social and governance data. Platform includes carbon accounting, regulatory…
Sells to B2B sustainability, finance and investment teams at medium and large enterprises and fund managers managing portfolio ESG data, across financial services, infrastructure, technology, food…
Financial Health
WeakWeak · Hiring · 100% CAGR over 3y
Location
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Computed from 2 filingsDevelops cloud-based software for music publishers, record labels, and media companies to manage music catalogues, rights and assets, administer licensing, and calculate and report royalties.…
Sells B2B to music and entertainment organisations, including large-scale music catalog owners, music publishers, record labels, production music libraries, broadcasters, networks and studios.
Financial Health
WeakWeak · -29% CAGR over 1y
Location
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Computed from 5 filingsDevelops employee engagement software that gathers regular employee feedback, analyses sentiment using AI, and provides dashboards and insights to managers to identify workplace issues, improve…
Targets HR teams, people leaders and business managers at organisations ranging from startups to large enterprises, across sectors.
Financial Health
DistressedDistressed · 0% CAGR over 4y
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Computed from 4 filingsProvides an AI-powered microlearning platform for workplace training. Delivers short, gamified lessons for compliance, leadership, onboarding, sales and role‑based skills, with tools to create…
Serves HR, L&D, compliance and sales enablement buyers at businesses across financial services, hospitality, technology, retail, manufacturing, legal, IT services, healthcare, logistics, maritime and…
Financial Health
HealthyHealthy · Hiring · 39% CAGR over 3y
Location
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Computed from 4 filingsProvides an event management platform for conferences and trade shows, offering tools for registration, ticketing and onsite check‑in, attendee networking, mobile event apps, exhibitor and sponsor…
Serves B2B event organizers, including trade show and exhibition companies, associations, conference and congress organisers, medical event teams, media companies, nonprofits and professional…
Financial Health
WeakWeak · -31% CAGR over 3y
Location
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Computed from 3 filingsDevelops digital self-service and e‑commerce platforms for airports and hospitality venues, including mobile ordering systems, marketplace software, and self-service kiosks that enable travelers to…
Sells to B2B customers in travel hospitality, especially airport operators, developers and concessionaires. Also serves hospitality businesses in airports and wider venues, restaurants, hotels and…
Financial Health
WeakWeak · 0% CAGR over 2y
Location
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Computed from 5 filingsProvides a software platform for managing shift‑based and contingent workforces, including vendor management, shift scheduling, time tracking, compliance monitoring, and analytics, with a talent…
Sells to businesses with shift-based and contingent workforces, particularly workforce and contingent labour leaders in retail, hospitality, healthcare, logistics and manufacturing, plus staffing…
Financial Health
WeakWeak · -4% CAGR over 3y
Location
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Computed from 5 filingsDevelops event management software for planning and running corporate events, including registration websites, scheduling, budgeting, attendee apps, badge printing, email marketing, travel and…
Serves B2B enterprise event and marketing teams, particularly in legal, finance, automotive and pharmaceutical organisations running live, virtual and hybrid corporate events.
Financial Health
StrongStrong · Growing, Hiring · 18% CAGR over 4y
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Computed from 5 filingsProvides software for managing corporate giving and employee volunteering programmes, including payroll giving, donation matching, charity payments, grant management, reporting, and charity due…
Serves HR, CSR/ESG and community engagement teams at large enterprises, especially banks, building societies and other global corporations managing employee giving, volunteering and grant programmes…
Financial Health
StableStable · -2% CAGR over 4y
Location
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Computed from 5 filingsDevelops data analytics software that transforms and enriches business data to support decision‑making. Provides tools for activity‑based costing, cost‑to‑serve analysis, profitability modelling, and…
Serves B2B customers in FMCG, retail, manufacturing and investment banking, including supply chain, finance, sales and marketing teams, plus corporates, institutional investors and asset managers…
Financial Health
HealthyHealthy · -55% CAGR over 4y
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Computed from 5 filingsDevelops and operates a cloud-based platform for B2B organisations to create branded online communities and knowledge hubs. The software enables publishing resources, hosting discussions and events,…
Serves B2B brands, particularly revenue, retention and customer engagement teams, that need to educate and engage customers across the customer lifecycle. Targets companies with customer communities,…
Financial Health
WeakWeak · -12% CAGR over 4y
Location
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Computed from 5 filingsDevelops cloud-based identity governance and administration software that automates user access reviews, access certification and entitlement audits. Platform supports identity lifecycle management,…
Sells to enterprise IT, security, identity governance and compliance teams at companies with access review, audit and risk requirements, including regulated sectors such as banking, healthcare and…
Financial Health
StrongStrong · Hiring · 41% CAGR over 4y
Location
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Computed from 5 filingsProvides a cloud-based frontline operations platform that enables organisations to manage inspections, checklists, staff communications, training, onboarding and performance observations, helping…
Serves businesses with frontline workforces, including retail, transport and logistics, gyms, facilities management, utilities, hospitality, travel, field engineering and field sales teams.
Financial Health
HealthyHealthy · -70% CAGR over 4y
Location
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Computed from 3 filingsDevelops AI-based business process automation software that captures and processes documents such as invoices, purchase orders, emails and claims. Provides the inSTREAM platform for intelligent…
Serves enterprise and public-sector organisations, particularly finance, operations and customer service teams in retail/ecommerce, manufacturing, transport and logistics, and travel/leisure.
Financial Health
HealthyHealthy · Growing · 2% CAGR over 2y
Location
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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
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Computed from 5 filingsDevelops and provides a cloud-based ERP system for merchants to manage stock, sales orders, purchasing and processing. Software includes inventory tracking across locations, automated reordering…
Serves established B2B merchant operations with high-volume stock, purchasing, sales and processing needs, especially businesses handling materials across yards, teams and multiple locations.
Financial Health
HealthyHealthy · Hiring · 8% CAGR over 4y
Location
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How Apollo.io 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. SaaS 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 SaaS 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.
Apollo.io 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
How many UK SaaS companies use Apollo.io?
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