SaaS Companies in the UK: 40,827 Active Firms (2026)
Software-as-a-service companies sell subscription-priced cloud applications to organisations across the UK’s data-driven economy.
Buying decisions tend to sit with revenue, finance, product, operations and IT teams rather than a single software desk. The UK cohort spans horizontal business applications, vertical workflow systems for regulated users, developer and infrastructure tools, and public-sector cloud services. Customer acquisition splits between low-touch self-service for smaller teams and sales-led procurement where the application touches customer data, payments, compliance evidence or core operations. Engagements are usually recurring contracts, with pilots, onboarding, integration work and service-level negotiation becoming more common as buyers move from departmental use to business-critical deployment.
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Around 40,827 SaaS companies are actively trading in the UK, making the cohort broad enough to include enterprise suppliers, specialist workflow vendors and many recently formed micro-businesses. Within that active group, 741 report turnover above £5M and 11,597 were incorporated since 2022, so the list combines a sizeable long tail with a smaller revenue-proven tier. Reported employment totals 8,748 people, concentrated among firms that disclose employee numbers rather than the full labour footprint of UK cloud software.
UK SaaS suppliers are not licensed as a single regulated sector, so compliance usually follows the workload and buyer market. The ICO matters where platforms process personal data under UK GDPR and the Data Protection Act, while cyber security expectations, consumer and contract law, and sector rules apply when software supports regulated clients. Cloud dependency adds a market-structure point: the CMA has examined public cloud infrastructure services and identified competition concerns that could affect switching, egress costs and supplier choice for application providers. That scrutiny is not a licensing regime for SaaS providers, but it shapes procurement conversations.
The cohort appears likely to keep splitting between narrow workflow products and broader platforms that sit inside finance, operations and customer-facing teams. Early-commercial firms tend to use integrations, security posture and implementation support to move beyond self-serve adoption, while mature suppliers face more scrutiny on contract terms, resilience and data processing. Consolidation may come from buyers preferring fewer suppliers and from cloud infrastructure economics, rather than from a product cycle alone. Scarcity at the scale-up end suggests the long tail will remain a defining feature.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
40,827
Active firms
2026
741
Above £5M revenue
Scale-screening threshold
11,597
Incorporated since 2022
Recent formation cohort
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Key facts
About 1% of the trading cohort reports turnover above £5M (741 of 40,827 firms) — the rest sits below that revenue band.
28% of the cohort was incorporated since 2022 (11,597 firms), so a sizeable share is in its first few filing cycles.
UK SaaS suppliers are not licensed as a single sector; regulatory exposure usually comes through data protection, cyber security, consumer and contract law, and sector rules where software serves regulated clients.
The ICO is the relevant UK data-protection regulator where providers process personal data under UK GDPR and the Data Protection Act 2018.
The CMA closed its UK public-cloud infrastructure investigation on 31 July 2025, with remedies and a recommendation to examine the two largest infrastructure providers under strategic market status powers.
SaaS is described as one of the UK’s largest ICT markets, within a wider market of about 100,000 software companies.
The UK is described as the “second largest” ICT market by ICT spending per head after the US, and the “No. 1 destination for U.S. ICT businesses in Europe”.
Top UK SaaS companies
Financial sub-scores
Computed from 5 filingsProvides SaaS platforms and services for managing secure data sharing via APIs, including trust directories, PKI infrastructure, OAuth authorisation servers, AI‑driven access control, and conformance…
Sells to businesses, governments, regulators, central banks and industry consortia building secure API and open data-sharing ecosystems, especially in financial services, digital identity and…
Financial Health
StrongStrong · Growing, Hiring · 40% CAGR over 4y
Location
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Computed from 2 filingsDevelops and provides cloud-based patient management and clinical record software for psychological therapy and mental health services. Offers SaaS applications, system integration and support tools…
Serves public, private and voluntary healthcare providers, plus individual practitioners, mainly psychological therapy and mental health services in England, including NHS Talking Therapies, CYP…
Financial Health
WeakWeak · Hiring · 16% CAGR over 1y
Location
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Computed from 3 filingsDevelops cloud-based electronic patient record (EPR) software for healthcare providers. The platform includes patient administration systems, electronic prescribing and medicines administration…
Serves UK public-sector healthcare organisations, especially NHS trusts, hospitals and regional care systems seeking electronic patient record platforms for clinical, operational and patient…
Financial Health
StrongStrong · Growing, Hiring · 33% CAGR over 2y
Location
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Computed from 3 filingsDevelops governance, risk and compliance (GRC) software platform that automates risk management, compliance tracking, internal audit, incident management, data privacy and regulatory reporting.…
Serves enterprise and complex businesses with governance, risk, compliance, internal audit, information security, data privacy and regulatory reporting teams, including organisations managing…
Financial Health
StrongStrong · Hiring · 52% CAGR over 2y
Location
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Computed from 3 filingsDevelops software for managed service providers and IT departments, including remote monitoring and management (RMM), professional services automation (PSA), remote access, cybersecurity, backup, and…
Targets MSPs and other B2B IT service organisations, including IT departments, managed print providers, VARs and security leaders responsible for service delivery, endpoints, remote support, backup…
Financial Health
StrongStrong · Profitable, Growing, Hiring · 7% CAGR over 2y
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Computed from 3 filingsDevelops and operates cloud-based software platforms and managed services for utilities and healthcare sectors. Systems support electricity, gas and water market operations including billing,…
Serves B2B and public-sector organisations in regulated UK utilities, healthcare and pharmaceuticals, including DNOs, IDNOs, energy suppliers, gas networks, water wholesalers and retailers,…
Financial Health
StrongStrong · Growing, Hiring · 10% CAGR over 2y
Location
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Computed from 5 filingsDevelops regulatory compliance software for asset managers, hedge funds, banks and other financial institutions. The platform automates monitoring of investment rules, shareholding disclosures,…
Serves compliance teams at asset managers, hedge funds, investment banks, pension funds and other financial institutions, from smaller firms to large global organisations managing regulated…
Financial Health
HealthyHealthy · Hiring · 18% CAGR over 4y
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Computed from 4 filingsProvides cloud-based HR, payroll and recruitment software for businesses. Platform includes tools for payroll processing, pension submissions, employee onboarding, time and attendance tracking,…
Serves UK SMEs and SMB employers, especially HR, payroll and hiring teams. Also targets accounting firms, payroll bureaus and referral partners serving small-business clients.
Financial Health
StrongStrong · Hiring · 100% CAGR over 3y
Location
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Computed from 3 filingsProvides cloud-based software platform for subscription and quote-to-cash management including billing, payments, revenue recognition, pricing, usage metering, accounts receivable automation, and…
Serves B2B finance, billing, revenue and operations teams at companies running subscription, usage-based or hybrid monetization models, especially those managing complex quote-to-cash and subscriber…
Financial Health
StableStable · Hiring · 9% CAGR over 2y
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Computed from 3 filingsDevelops cloud-based management information and finance software for education institutions. Provides systems for pupil data management, school administration, accounting, parent and student portals,…
Serves education-sector organisations, including primary and secondary schools, multi-academy trusts, SEND and all-through schools, maintained schools, local authorities and school finance or…
Financial Health
StrongStrong · Profitable
Location
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Computed from 3 filingsDevelops software for revenue and contract management, including CPQ (configure‑price‑quote), document generation, e‑signature, billing, pricing optimisation, and contract lifecycle management tools,…
Serves B2B organisations, particularly sales, legal, finance, procurement, IT and operations teams in technology, financial services, healthcare, life sciences, manufacturing, and transportation and…
Financial Health
HealthyHealthy · Profitable, Growing · 2% CAGR over 2y
Location
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Computed from 4 filingsProvides a data security platform that monitors SaaS applications and AI tools to detect sensitive information, manage data security posture, enforce data loss prevention policies, and automate…
Serves B2B enterprise security and IT teams, including CISOs, in organisations using SaaS and AI tools, with sector focus on HR, insurance, healthcare and fintech.
Financial Health
StrongStrong · Hiring · 19% CAGR over 3y
Location
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Computed from 4 filingsDevelops research management software used by universities and research organisations to manage grants and funding applications, ethics reviews, research contracts, compliance, data protection impact…
Serves universities, healthcare institutions, national research organisations and other large research bodies worldwide, targeting research governance, compliance, funding, ethics and clinical trial…
Financial Health
StrongStrong · Growing, Hiring · 35% CAGR over 3y
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Computed from 5 filingsProvides a cloud‑native SaaS platform for data protection and cyber recovery. Offers backup, ransomware recovery, data governance, eDiscovery and compliance tools for enterprise workloads, public…
Serves enterprise IT, security and compliance teams that manage cloud, SaaS, endpoint and hybrid infrastructure, plus managed service providers and channel partners delivering data protection…
Financial Health
StableStable · Hiring · 7% CAGR over 4y
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Computed from 5 filingsDevelops and provides cloud-based communications software, including hosted PBX, voice calling and messaging platforms, supplied through reseller partners to businesses and IT managed service…
Serves UK managed service providers, communications resellers, small and medium-sized businesses, and complex multi-site organisations needing workplace communications software.
Financial Health
StrongStrong · Hiring · 6% CAGR over 4y
Location
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Computed from 3 filingsDevelops and provides cloud-based accounting software for small businesses, offering tools for invoicing, expense tracking, bank reconciliation, inventory, tax management, financial reporting, and…
Sells primarily to startups, small and growing businesses, nonprofits, and accounting/bookkeeping firms, with users including business owners, finance teams, accountants, and bookkeepers.
Financial Health
StrongStrong · Growing, Hiring · 409% CAGR over 2y
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Computed from 5 filingsProvides cloud-based contract lifecycle management software that enables teams to draft, review, negotiate, approve, sign and store contracts. The platform uses AI to analyse and redline documents,…
Serves legal, HR, procurement, sales and finance teams at scaling businesses, especially B2B SaaS and marketplace companies such as food delivery, auto and travel platforms.
Financial Health
StrongStrong · Hiring · 54% CAGR over 4y
Location
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Computed from 3 filingsDevelops cybersecurity software that protects critical IT infrastructure from ransomware attacks. Provides tools for ransomware containment, server intrusion protection, and virtual server security,…
Serves B2B and public-sector organisations with critical IT infrastructure, targeting CISOs and cybersecurity teams in education, finance, government, healthcare, legal and manufacturing sectors.
Financial Health
StrongStrong · Hiring · 17% CAGR over 2y
Location
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Computed from 5 filingsProvides cloud-based talent acquisition software used by organisations to manage recruitment processes, including job posting, applicant tracking, candidate screening, interview scheduling, offer…
Serves mid-size and enterprise employers, targeting HR, talent acquisition, hiring, IT and finance teams with corporate, high-volume and professional hiring needs across sectors including healthcare,…
Financial Health
StrongStrong · Hiring · 43% CAGR over 4y
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Computed from 5 filingsProvides cloud-based software for automated pre-employment background screening. Platform performs identity, criminal record, right‑to‑work, education and employment verification checks, reference…
Serves HR and recruiting teams at businesses of all sizes, from small firms to enterprises, with emphasis on finance, health and social care, childcare and education employers.
Financial Health
StrongStrong · Growing, Hiring · 95% CAGR over 4y
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Computed from 4 filingsDevelops software platforms for asset managers and private markets firms to manage investors, fundraising and fund operations. Provides tools for datarooms, electronic subscriptions, investor…
Serves B2B financial services clients, including private markets and asset managers, private wealth firms, banks, and asset management service providers such as placement agents, fund administrators,…
Financial Health
StrongStrong · Growing, Hiring · 59% CAGR over 3y
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Computed from 5 filingsDevelops a software platform that aggregates public sector procurement data and tender notices, helping suppliers identify government contract opportunities, analyse markets, track expiring…
Sells B2B to suppliers pursuing public sector contracts, especially tech and software vendors, plus public sector sales, bid, and procurement teams that need to identify, qualify, track, and win…
Financial Health
StrongStrong · Growing, Hiring · 40% CAGR over 4y
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Computed from 3 filingsDevelops and provides open-source and cloud software platforms for API management, application integration, identity and access management, and AI/agent services, enabling organisations to build,…
Serves large enterprises and public-sector organisations, especially financial services, healthcare, telecoms and government teams, with buyers including CIOs, IT architecture, platform engineering,…
Financial Health
HealthyHealthy · Profitable · 0% CAGR over 2y
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Computed from 4 filingsDevelops digital employee experience management software that monitors workplace devices, applications and collaboration tools, providing IT teams with real-time analytics, diagnostics, alerts and…
Sells to enterprise IT teams, digital workplace leaders and service desk functions in financial services, government and professional services organisations.
Financial Health
HealthyHealthy · Hiring · 5% CAGR over 3y
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Computed from 4 filingsDevelops and provides cloud-based software for corporate and personal insolvency practitioners, including case management platforms, creditor portals, and workflow tools that manage restructurings,…
Serves B2B insolvency, restructuring and turnaround professionals, including firms managing corporate and personal insolvency cases, across the UK, Ireland, offshore jurisdictions and Asia-Pacific.
Financial Health
StrongStrong · Growing, Hiring · 23% CAGR over 3y
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Computed from 3 filingsProvides cloud software for finance teams to manage quoting, billing and revenue recognition for custom B2B contracts. Platform extracts contract terms, automates invoicing, supports usage‑based and…
Serves finance and revenue operations teams at B2B software companies, especially SaaS businesses with custom contracts, usage-based or hybrid pricing, and scaling sales motions from startup to IPO.
Financial Health
WeakWeak · Hiring · 7% CAGR over 2y
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Computed from 5 filingsDevelops enterprise transformation software delivered as a SaaS suite. Provides tools for enterprise architecture management, strategic and application portfolio management, business process and data…
Serves large enterprises and complex organizations worldwide, especially enterprise architecture, IT portfolio, governance, risk, compliance, business architecture and transformation teams aligning…
Financial Health
StableStable · -59% CAGR over 4y
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Computed from 2 filingsDevelops digital banking software for financial institutions. Provides a platform that enhances customer journeys such as onboarding, applications, payments, servicing and support, enabling banks and…
Sells B2B to financial services organisations, including banks, building societies, automotive finance providers, and credit card, store card and personal loan issuers seeking digital customer…
Financial Health
WeakWeak · -11% CAGR over 1y
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Computed from 5 filingsProvides cloud-based contact centre and unified communications software, including omnichannel customer engagement, IVR, AI automation, workforce management and analytics. Also delivers consultancy,…
Serves B2B and public-sector organisations with customer service and contact centre operations, including retail, financial services, travel and leisure, and energy and utilities teams.
Financial Health
StrongStrong · Growing, Hiring · 23% CAGR over 5y
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Computed from 4 filingsDevelops a cloud-based integration platform that connects applications, data sources, and APIs. Provides tools for data integration, ETL/ELT, API management, and workflow automation, with pre-built…
Sells to enterprise IT, data and business teams across manufacturing, retail, financial services and higher education, plus ISVs, MSPs and OEM/embedded providers.
Financial Health
HealthyHealthy · Hiring · 39% CAGR over 3y
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Computed from 5 filingsProvides cloud‑based procurement and e‑sourcing software for organisations, including tools for RFQs, reverse auctions, supplier discovery and onboarding, contract management, spend analysis, and…
Serves B2B and public-sector procurement teams, including CPOs, procurement managers and buyers in enterprises, consultancies and organisations managing sourcing, supplier, contract and spend…
Financial Health
StrongStrong · Hiring · 19% CAGR over 4y
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Computed from 4 filingsDevelops software and services for data compliance and risk management, including data mapping for privacy requests, enterprise information archiving, trade surveillance, communications recording,…
Serves compliance, risk and data governance teams in highly regulated sectors, including financial services, legal, insurance, crypto, pharmaceuticals, healthcare, recruitment, public sector and…
Financial Health
HealthyHealthy · Hiring · 40% CAGR over 3y
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Computed from 4 filingsDevelops and supplies care management software for social care providers, including digital care planning, medication management (eMAR), staff training, operations and maintenance tools, resident…
Serves UK social care providers, including residential care homes, nursing homes, supported and retirement living operators, learning disability services and mental health support providers.
Financial Health
StrongStrong · Hiring · 28% CAGR over 4y
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Computed from 4 filingsProvides software and services for managing international workforces, including global payroll processing, employer‑of‑record employment, contractor onboarding and payments, HR information…
Serves startups, mid-market companies and enterprises with distributed or international workforces, targeting HR, payroll, recruiting and operations teams hiring employees and contractors across…
Financial Health
StrongStrong · Hiring · 38% CAGR over 3y
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Computed from 5 filingsDevelops practice and case management software for enterprise law firms, integrating matter management, legal accounting, document management, compliance tools, reporting and API integrations to…
Sells to enterprise law firms in the UK, serving legal practices seeking practice and case management software, including firms with multiple departments and complex compliance, accounting and…
Financial Health
HealthyHealthy · -4% CAGR over 5y
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Computed from 5 filingsDevelops software platforms for financial institutions to manage market data subscriptions, exchange compliance and reporting. Tools track application and terminal usage, manage licences and…
Serves B2B customers in financial services and the legal sector, especially firms managing market data, exchange compliance, subscriptions and software spend. Targets teams responsible for market…
Financial Health
StrongStrong · Growing, Hiring · 49% CAGR over 4y
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Computed from 2 filingsProvides cloud-based software and CRM for alternative investment firms including private equity, venture capital and hedge funds. Platform supports deal management, investor relations, fundraising,…
Serves B2B alternative investment firms and allocators, including private equity, venture capital, hedge funds, real estate and infrastructure investors, funds of funds, pensions, endowments, family…
Financial Health
WeakWeak · -4% CAGR over 1y
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Computed from 4 filingsDevelops cloud-based payroll software for accountants, bookkeepers and payroll bureaux. Platform automates pay runs, timesheets, employee self‑service, pension auto‑enrolment, HMRC RTI reporting,…
Sells to UK payroll bureaux, accountancy firms and bookkeeping businesses that manage payroll for client employers, including firms needing bureau or reseller arrangements.
Financial Health
WeakWeak · -4% CAGR over 3y
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Computed from 4 filingsDevelops workplace management software that enables organisations to book desks, meeting rooms and other resources, manage visitors, monitor occupancy through sensors, and analyse workspace usage…
Serves public-sector and enterprise buyers, including central and local government, NHS, universities, legal, utilities, insurance, retail, manufacturing, construction, housing associations and…
Financial Health
HealthyHealthy · Hiring · 31% CAGR over 3y
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Computed from 4 filingsDevelops legal practice management software for law firms, providing case and document management, time recording, billing, and compliance tools in an integrated cloud-based system for managing…
Sells to UK law firms and legal practices, from solo practitioners to growing multi-user firms. Targets legal professionals seeking practice management software, including firms needing compliant,…
Financial Health
HealthyHealthy · Growing, Hiring · 4% CAGR over 3y
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Computed from 5 filingsProvides a software platform for employers to manage employee benefits programmes, including flexible spending allowances, benefits enrolment, rewards and recognition, and total reward statements,…
Sells to HR, reward and benefits teams at global enterprises and multinationals managing complex employee benefits across countries, plus benefits brokers supporting employer clients.
Financial Health
StrongStrong · Hiring · 130% CAGR over 4y
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Computed from 5 filingsProvides accounting software combined with accountant support for small businesses. Platform automates bookkeeping, categorises transactions, generates financial insights, manages invoices and…
Sells to UK small business owners needing accounting, bookkeeping and tax support. Targets business customers that want an all-in-one finance solution, including firms switching from another…
Financial Health
StrongStrong · Growing, Hiring · 81% CAGR over 4y
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Computed from 2 filingsProvides cloud-based smart building and integrated workplace management software that helps organisations manage facilities, real estate portfolios, workspaces, assets, maintenance, energy use and…
Sells primarily to large organisations managing workplaces, campuses and property portfolios, including facilities, real estate, finance and procurement teams. Serves higher education institutions,…
Financial Health
StableStable · Profitable · 5% CAGR over 1y
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Computed from 3 filingsDevelops healthcare software, including electronic health record systems and clinical information platforms used by hospitals and healthcare providers to manage patient records, clinical workflows,…
Serves healthcare organisations, including hospitals, health systems, clinics and public-sector health services, with buyers such as clinical, operational and IT leaders.
Financial Health
StrongStrong · Profitable, Hiring · 65% CAGR over 2y
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Computed from 5 filingsProvides international payroll services through a cloud platform that manages payroll processing, compliance monitoring, reporting, and cross‑border employee payments. Includes HR system…
Serves B2B employers with international workforces, from SMEs to Fortune 500 enterprises. Targets HR, payroll, rewards and finance leaders across varied industries managing multi-country employees…
Financial Health
StrongStrong · -1% CAGR over 4y
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Computed from 5 filingsProvides a cloud-based platform for managing guest and staff WiFi networks in venues. Offers secure authentication, captive portals, analytics, and marketing integrations to capture visitor data and…
Sells to venue-based businesses and public sector organisations, including hospitality, retail, education, healthcare, transport, events, attractions, offices and residential operators, targeting IT,…
Financial Health
WeakWeak · -69% CAGR over 4y
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Computed from 3 filingsDevelops software platforms and data services for insurance retailers and insurers, including policy administration, digital customer interfaces, aggregator connectivity, telematics integration,…
Serves B2B customers in the UK insurance sector, including large insurance retailers, insurers, brokers, aggregators and other insurance operations with high-volume digital and data needs.
Financial Health
HealthyHealthy · Profitable · 3% CAGR over 1y
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Computed from 5 filingsDesigns and develops software systems for rail and construction industries, including RailSmart applications for safety compliance, train performance, operations control, fleet defect management,…
Serves B2B customers in the UK rail and construction sectors, including major rail operators, infrastructure organisations and construction technology partners seeking digital operational support.
Financial Health
WeakWeak · -4% CAGR over 6y
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Computed from 5 filingsDevelops IT asset management software for tracking and managing hardware, software, SaaS and cloud resources. Platform provides asset discovery, usage monitoring, software licence management, cost…
Serves IT, software asset management, FinOps and procurement teams in businesses with complex hardware, software, SaaS, cloud and AI estates, including organisations using ServiceNow.
Financial Health
StableStable · -67% CAGR over 4y
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Computed from 3 filingsDevelops AI-enabled legal software for law firms, supporting litigation and arbitration with tools for case management, document and transcript analysis, virtual hearings, workflow automation, and…
Sells B2B to law firms and legal teams, especially litigation and arbitration practices, partners, lead counsel, associates, legal innovation teams, paralegals and litigation support teams managing…
Financial Health
StrongStrong · Profitable, Growing · 4% CAGR over 2y
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How UK SaaS companies work and how to sell to them
What they do
SaaS companies earn mainly through recurring access to hosted software, usually priced by seat, usage tier, transaction volume or account size. Smaller products often begin with card-paid subscriptions and standard onboarding; business-critical systems tend to add annual contracts, implementation fees, integration work, support tiers and service-level commitments. Revenue can also come from managed services, premium support, compliance add-ons and partner referral arrangements, especially where the platform sits inside finance, customer operations, product delivery or regulated workflows. Gross margin depends less on the licence line and more on cloud costs, support burden, churn, and the amount of human implementation needed to make the application useful.
Who they sell to
Typical buyers range from smaller teams looking for a departmental tool to mid-market and enterprise customers replacing older workflow systems. Public-sector and regulated-industry buyers usually bring longer procurement steps, more security review and clearer evidence requirements. Decision-makers vary by use case: CFOs and finance operations teams tend to own billing and revenue systems, CTOs and engineering leaders assess developer or infrastructure tools, while operations, procurement, legal and data-protection teams often appear once the contract touches customer information or core processes. Low-touch sales can close through self-serve trials; larger accounts usually involve demos, pilots, security questionnaires, commercial negotiation and sometimes RFP-style procurement.
What they buy
Most SaaS firms tend to spend on the systems needed to acquire customers, operate cloud services and pass buyer scrutiny. Common categories include CRM, marketing automation, customer support, billing, subscription management, analytics, finance software, HR systems and recruitment support. Product and engineering teams often buy cloud infrastructure, developer tooling, monitoring, observability, incident management, testing, data warehousing and security services. Firms selling into regulated or public-sector buyers may also need legal advice, privacy support, penetration testing, compliance evidence management and outsourced implementation partners. As sales motion matures, spend often moves from founder-selected tools to governed procurement, vendor consolidation and clearer ownership by finance, IT and security.
Why and how to sell to them
SaaS buyers tend to evaluate vendors when growth exposes operational gaps: more salespeople, more customers, higher support load, larger contracts, tougher security reviews or a move from monthly self-serve plans to annual enterprise deals. Funding events, senior hires in finance or engineering, new public-sector ambitions and rising churn can all create intent. Useful outbound usually links the pitch to a measurable constraint, such as reducing cloud waste, shortening security review cycles, improving billing accuracy, lowering support burden or helping sales teams convert trials into contracted accounts. Claims should be specific and evidenced, because SaaS operators are used to comparing tools and will test whether a vendor understands recurring-revenue economics.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
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Frequently asked questions
How many SaaS companies are there in the UK?
What counts as a SaaS company in this list?
Which are the largest SaaS companies in the UK?
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How does UK SaaS compare internationally?
How is this list built and how fresh is the data?
How big are the typical SaaS companies in the UK?
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What SIC codes does this use?
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