SaaS Companies Using Merge in the UK: 51 Active Firms (2026)
SaaS companies using integration APIs connect cloud applications, customer systems and data workflows for UK business buyers.
For SaaS providers, an embedded integration layer usually sits close to product management, solutions engineering and customer success rather than pure marketing technology. It helps packaged cloud software connect to buyers’ existing finance systems, HR tools, CRMs, support desks and operational databases, which makes implementation less dependent on bespoke engineering work. Running this type of API tends to signal a business selling to other companies with defined onboarding journeys, a security-aware procurement motion and enough product budget to maintain connector coverage. The fit is clearest where retention depends on keeping customer workflows inside the application, not merely on acquiring sign-ups.
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Across the UK, 51 actively trading SaaS providers run this integration API. Reported employment footprint is 977 people, giving the adoption group a measurable staff base rather than only founder-led micro-businesses. Within the customer-data-platform category for SaaS, the system ranks second at 33.3% of a 153-company comparison set. Registered offices are skewed towards London at 60.8%, with smaller clusters in the South East at 9.8% and the North West at 7.8%. The mix also overlaps with AI and machine-learning tags at 49.0%, which fits the wider pattern of integration-heavy SaaS products.
UK SaaS suppliers do not have a dedicated SaaS licensing regime, so scrutiny falls through the activity being performed and the customers being served. For companies running embedded integration APIs, the practical issues are usually UK GDPR roles, processor terms, sub-processor lists, audit rights, cyber controls and incident handling when customer records move between cloud services. The ICO is the relevant UK data-protection regulator. Sector rules can still matter where the buyer is itself regulated, including fintech clients. The CMA has also examined UK public cloud infrastructure services and reported competition concerns leading to remedies, adding background pressure around dependency on hyperscale hosting.
Adoption appears tied to product maturity rather than simple website fashion. SaaS teams that sell through direct channels tend to add embedded connectors once onboarding, retention and expansion depend on live operational records. The same pressure can make the vendor market harder to read: integration layers are bought as specialist tooling, bundled into customer-data stacks, or rebuilt in-house when product teams want closer control. Security questionnaires and procurement reviews are likely to keep favouring providers that can evidence governance, but early-commercial SaaS firms may still delay adoption until integration demand becomes a sales blocker.
Adoption by company size
Adoption of Merge rises with company size across the trading UK SaaS companies in this cohort. 0.1% of the 37,913 companies with under 10 employees run Merge (25 detected). 1% of the 1,886 companies with 10–50 employees run Merge (19 detected). 1.2% of the 166 companies with over 50 employees run Merge (2 detected). That is a 1.1% gap between the over 50 employees and under 10 employees bands.
51
Active firms
2026
33.3%
Of detected Customer data platform share
UK SaaS
9
Median headcount
Filed accounts
123
Verified contacts
Across this cohort
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Key facts
About 11% of the trading cohort reports turnover above £5M (6 of 51 firms) — the rest sits below that revenue band.
23% of the cohort was incorporated since 2022 (12 firms), so a sizeable share is in its first few filing cycles.
Among SaaS companies with a detectable customer data platform, the page’s system is detected in 33.3% (51) of 153 companies, behind another system at 54.9% (84).
London accounts for 60.8% (31) of the cohort, followed by the South East at 9.8% (5) and the North West at 7.8% (4).
The wider stack skews towards cloud and compliance tooling, with 98.0% (50) also running each of three major cloud or infrastructure technologies and 88.2% (45) also running compliance tooling.
Sector tags overlap heavily: 49.0% (25) of these SaaS users are also tagged AI & Machine Learning, 43.1% (22) Startup and 23.5% (12) Fintech.
The ICO is the relevant UK data-protection regulator where SaaS providers process personal data under UK GDPR and the Data Protection Act 2018.
Integration platform market share among UK SaaS
What else do Merge-running SaaS run?
Share of the 51 Merge-running UK companies where each technology was also detected. As of June 2026.
Where Merge 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.
9
Median headcount
£788.2K
Median UK turnover
11.8%
Above £5M turnover
12
Incorporated since 2022
123 verified decision-maker contacts
across these 51 companies, with emails available in Firmbase. Filter by role, seniority and stack.
Top UK SaaS using Merge
Ranked by sales-readiness score: an AI model assesses what each company does, its sector and size, and scores its overall fit. Best-fit prospects appear first.
Financial sub-scores
Computed from 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
Location
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Financial sub-scores
Computed from 5 filingsDevelops AI software for customer success teams that analyses product usage, support interactions and meeting data to predict churn risk, provide account insights and recommended actions, and…
Sells to B2B subscription and SaaS companies, targeting customer success leaders and teams responsible for retention, renewals, churn risk, account management, and revenue expansion.
Financial Health
StrongStrong
Location
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Financial sub-scores
Computed from 5 filingsDevelops a cloud-based analytics platform that connects to databases and business tools, enabling teams to query data with AI, build metric trees and dashboards, perform collaborative analysis, and…
Sells to B2B data, analytics and business teams at organisations that need collaborative BI across data warehouses, semantic layers, spreadsheets and SaaS tools.
Financial Health
StrongStrong · Growing, Hiring · 24% CAGR over 4y
Location
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Financial sub-scores
Computed from 4 filingsDevelops API management software providing API gateway, service mesh, and developer tools. Platform enables organisations to design, test, deploy, secure and monitor APIs and AI integrations across…
Sells to enterprise platform, AI and developer teams, plus executives, across financial services, healthcare, higher education, insurance, manufacturing, retail, software and technology, and…
Financial Health
StrongStrong
Location
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Financial sub-scores
Computed from 2 filingsDevelops data integration and streaming software that captures, processes and delivers real-time data between databases, applications and cloud platforms. Provides tools for building data pipelines,…
Serves B2B data, analytics and IT teams at enterprises in financial services, retail/CPG, healthcare, travel/logistics, aviation, manufacturing, energy, telecoms, technology and media.
Financial Health
StrongStrong · Hiring · 71% CAGR over 1y
Location
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Provides a cloud-based platform that automates security and regulatory compliance processes. Software monitors systems, collects audit evidence, manages access controls and risk, handles vendor…
Serves startups, mid-market and enterprise businesses, especially security, compliance and GRC teams in healthcare, government and fintech, plus organisations pursuing SOC 2, ISO 27001, HIPAA, PCI…
Financial Health
N/AN/A
Location
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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
N/AN/A
Location
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Financial sub-scores
Computed from 5 filingsDevelops a cloud platform for analytics engineering that provides an AI‑assisted IDE, orchestration of dbt and Python data pipelines, and tools to monitor and optimise data warehouse usage and costs.
Serves B2B data and analytics teams using dbt, Snowflake or BigQuery, including analytics engineers, data leaders and finance/operations executives at companies running analytics and AI pipelines.
Financial Health
WeakWeak · Hiring · 24% CAGR over 4y
Location
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Financial sub-scores
Computed from 3 filingsProvides embedded financial infrastructure for software platforms, enabling them to offer products such as revenue-based capital financing and business charge cards to their customers. Integrates via…
Sells to B2B software platforms, including vertical SaaS providers, payment facilitators and marketplaces, whose customers are small businesses needing embedded financial tools.
Financial Health
DistressedDistressed · -38% CAGR over 2y
Location
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Financial sub-scores
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
Location
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Provides a spend management platform that links corporate credit cards with software for tracking expenses, collecting receipts, processing invoices, and reconciling transactions. Includes budgeting…
Sells to finance teams, CFOs and operations leaders at businesses managing corporate card spend, expenses, invoices and multi-entity or cross-border operations, with integrations for ERP, HRIS and…
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Financial sub-scores
Computed from 5 filingsDevelops messaging software that integrates SMS, MMS and business messaging into collaboration platforms such as Microsoft Teams and Cisco Webex, enabling individuals and teams to send, receive and…
Serves businesses, teams and individual business users that rely on Microsoft Teams or Webex, including organisations needing shared inboxes and customer messaging across SMS, MMS and WhatsApp.
Financial Health
StrongStrong · Growing, Hiring · 34% CAGR over 4y
Location
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Financial sub-scores
Computed from 2 filingsProvides cloud-based work management and collaboration software. Platform includes project and task management, CRM, service management and development tools, with automation and AI features for…
Serves businesses from SMBs to enterprises, including Fortune 500 organisations, across teams such as marketing, sales, operations, product, IT, HR and PMO, with stated industry focus on retail,…
Financial Health
HealthyHealthy · Hiring · 29% CAGR over 1y
Location
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Financial sub-scores
Computed from 5 filingsDevelops a software platform that enables B2B SaaS companies to build, deploy and manage AI agents within their products. Provides conversational interfaces, embeddable widgets, SDKs, workflow tools,…
Targets B2B SaaS companies, especially product and engineering teams at learning platforms, HR and people operations software providers, and talent acquisition platforms serving business customers.
Financial Health
HealthyHealthy · Hiring · 54% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsDevelops application performance monitoring and observability software. Its FusionReactor platform monitors servers and applications, analyses database queries and performance bottlenecks, and…
Sells B2B to software development, DevOps and IT support teams at companies operating production applications and server infrastructure worldwide.
Financial Health
HealthyHealthy · Hiring · 18% CAGR over 4y
Location
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Computed from 2 filingsProvides software for contract lifecycle, vendor risk, and spend management. Platform supports vendor onboarding, compliance tracking, contract creation and e‑signature, renewal monitoring,…
Targets B2B organisations’ CFOs, legal, procurement, finance and risk teams that manage supplier relationships, contracts, compliance and spend, including NetSuite-using companies.
Financial Health
StableStable · Hiring · 35% CAGR over 1y
Location
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Computed from 3 filingsDevelops conversational and generative AI software for customer service automation. Provides a platform to build and manage AI agents for voice, chat and messaging, with tools for contact centre…
Serves enterprise contact centre and customer experience teams in airlines, automotive, finance, banking, healthcare, insurance, retail, e-commerce, telecoms and utilities.
Financial Health
HealthyHealthy · 4% CAGR over 2y
Location
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Develops software supply chain management tools for development teams, including artifact repository management, open‑source component analysis, vulnerability and license compliance scanning, malware…
Serves B2B software development, DevOps and security teams in organisations using open source and AI, including government, financial services, technology, manufacturing and healthcare sectors.
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Develops software for AI‑powered workflow and document automation. Provides tools for intelligent document processing, accounts payable and receivable automation, PDF and eSignature management, and…
Serves global enterprises, especially finance, operations and IT teams managing AP/AR, document-heavy workflows, secure print, PDF and eSignature processes across large organisations.
Location
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Financial sub-scores
Computed from 3 filingsDevelops location data APIs that calculate real‑time, multi‑modal travel times, routes and reachable areas. Provides tools including matrix travel time calculations, isochrones, geocoding and…
Sells B2B to developers, product teams and data or spatial analytics teams building location-based applications, including mapping, site selection, route optimisation and large-scale geospatial…
Financial Health
WeakWeak · 4% CAGR over 2y
Location
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Computed from 5 filingsProvides a software platform for documenting, managing and distributing design systems. The platform integrates with design and development tools, enabling teams to publish documentation, track…
Sells B2B to product, design and engineering teams, plus design system leaders, at scaling and enterprise organisations managing multi-product digital experiences.
Financial Health
StrongStrong · Hiring · 75% CAGR over 6y
Location
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Develops AI-powered software for private capital investors. The platform integrates CRM systems, document repositories and third‑party financial data to analyse historical deal information, generate…
Sells to institutional private capital investors, including private equity funds and regulated financial institutions, targeting investment teams such as investment managers, senior associates and…
Financial Health
N/AN/A
Location
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Computed from 3 filingsDevelops and provides a cloud‑native software platform for property and casualty insurers. The IBSuite system supports policy administration, underwriting, claims management, billing, rating, CRM,…
Serves B2B property and casualty insurance risk carriers, including insurers and related insurance organisations seeking modern core systems, with additional engagement for consulting firms involved…
Financial Health
StableStable · -29% CAGR over 2y
Location
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Computed from 2 filingsDevelops AI-powered software for financial services that integrates internal and external data to search knowledge bases, analyse companies and markets, automate due diligence, and generate…
Serves B2B financial services firms, particularly investment teams at institutions handling deal origination, screening, company analysis, due diligence, portfolio insights and document-heavy…
Financial Health
WeakWeak · Hiring · 40% CAGR over 1y
Location
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Computed from 3 filingsDevelops cloud-based human resources information system (HRIS) software with AI features for managing employee data, onboarding and offboarding, performance reviews, absence tracking, workflow…
Serves growing and global businesses, targeting HR and People Operations leaders plus finance, planning and IT teams responsible for employees across the organisation.
Financial Health
StrongStrong · Hiring · 22% CAGR over 2y
Location
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Computed from 2 filingsDevelops an AI revenue orchestration platform that analyses customer interactions and sales conversations to generate structured go‑to‑market data, automate CRM updates, capture notes, provide sales…
Serves B2B go-to-market teams, especially CROs, RevOps, sales, SDR/BDR, customer success, enablement, marketing and product leaders at companies managing CRM-driven revenue operations.
Financial Health
StrongStrong · Growing, Hiring · 150% CAGR over 1y
Location
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Computed from 5 filingsProvides a developer platform for building, deploying and managing applications, APIs, databases and AI workloads. Offers CI/CD pipelines, container and Kubernetes orchestration, GPU compute, and…
Sells to engineering and platform teams at startups and enterprises running cloud-native applications, AI workloads, databases and Kubernetes infrastructure across public cloud or their own VPCs.
Financial Health
StrongStrong · Hiring · 3% CAGR over 4y
Location
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Computed from 3 filingsDevelops portfolio monitoring software for private equity, venture capital and institutional investors. The platform aggregates data from accounting and business systems, automates data collection…
Serves private markets investment firms, including private equity, venture capital and institutional investors, targeting portfolio monitoring, operations and reporting teams managing multi-company…
Financial Health
StrongStrong · Hiring · 53% CAGR over 2y
Location
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Computed from 3 filingsProvides a merchant of record platform for software and app companies, handling subscription billing, payment processing, checkout, invoicing, global sales tax compliance, fraud prevention, and…
Serves B2B software and digital product businesses, including SaaS companies, mobile app publishers, app studios, game developers and subscription-led software teams, from startups to scaling firms…
Financial Health
HealthyHealthy · Hiring · 36% CAGR over 2y
Location
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Computed from 3 filingsDevelops enterprise software for sustainability management, enabling companies to measure carbon emissions and environmental impact, collect and standardise operational data, generate ESG and…
Sells to enterprise sustainability and ESG teams at large corporates, including Fortune 500 companies, major banks and global private equity firms with complex reporting obligations.
Financial Health
StrongStrong · Hiring · 224% CAGR over 2y
Location
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Computed from 5 filingsDevelops cloud-based audit software for accounting firms, providing digital working papers, audit data analytics, client collaboration tools and quality management features to manage audit…
Serves accounting and audit firms of all sizes, from small practices to global enterprises, targeting audit professionals and practice leaders responsible for audit delivery, quality and…
Financial Health
StrongStrong · Growing, Hiring · 4% CAGR over 4y
Location
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Computed from 5 filingsProvides a digital business banking platform offering multi‑currency accounts, virtual company cards, cross‑border payments, expense and accounts payable management, accounting integrations, and…
Serves finance teams at growth-oriented businesses operating across multiple markets, including companies with multi-currency payments, supplier spend, team expenses and Fortnox-based accounting…
Financial Health
StrongStrong · Hiring · 37% CAGR over 4y
Location
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Computed from 4 filingsDevelops talent acquisition and recruitment CRM software focused on campus and early‑career hiring. Provides tools for candidate sourcing, event management, interview scheduling, workflow automation,…
Sells to large enterprises, high-growth companies, and federal government agencies running early talent and campus recruiting programmes, across industries. Targets talent acquisition, university…
Financial Health
WeakWeak · Hiring · 33% CAGR over 3y
Location
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Computed from 2 filingsDevelops AI-powered project scheduling software that generates and optimises complex project schedules, provides disruption alerts, supports scenario planning and collaboration, and integrates with…
Serves B2B project planning teams at large construction and infrastructure organisations, including major contractors, energy utilities and project portfolio owners.
Financial Health
WeakWeak · 0% CAGR over 1y
Location
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Computed from 2 filingsDevelops artificial intelligence software for healthcare providers that listens to clinical consultations and automatically generates structured medical notes. The system integrates with electronic…
Serves NHS and other UK healthcare organisations, including GP practices, hospitals, emergency departments, outpatient clinics and ambulance services, targeting clinicians and clinical operations…
Financial Health
WeakWeak · Hiring · 183% CAGR over 1y
Location
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Develops a platform and API for creating real-time interactive AI video avatars. Provides tools to generate photorealistic digital agents that converse with users and integrate into applications for…
Sells to businesses and developer teams building customer support, sales, training, language tutoring and medical service experiences, including teams seeking API or no-code integration for…
Financial Health
N/AN/A
Location
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Computed from 3 filingsDevelops AI-powered software that automatically generates and maintains visual end‑to‑end tests for web applications by recording user interactions, tracking executed code paths, and replaying…
Sells to B2B software engineering, QA, and developer experience teams at organizations building complex web applications, from startups to larger technology companies.
Financial Health
WeakWeak · Hiring · 29% CAGR over 2y
Location
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Develops AI software for automotive retailers and manufacturers. Provides a platform that automates customer communications, sales engagement, marketing campaigns, merchandising, and service…
Serves B2B automotive retail customers, including franchised and independent dealers, OEMs, specialty vehicle dealers, enterprise dealer groups, and agencies, with audiences across sales, marketing,…
Financial Health
N/AN/A · -67% CAGR over 3y
Location
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Computed from 4 filingsOperates a cybersecurity platform that runs bug bounty and vulnerability disclosure programs, connecting organisations with vetted ethical hackers to identify software vulnerabilities. Also provides…
Sells to businesses and public sector organisations running security testing programmes, especially teams in retail, gaming, finance, hospitality, SaaS, telecoms, transport, healthcare, media,…
Financial Health
StrongStrong · Hiring · 17% CAGR over 3y
Location
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Develops governance, risk and compliance (GRC) software that helps organisations manage regulatory compliance, cyber risk, audits, third‑party risk and data privacy. Platform includes risk registers,…
Serves B2B risk, compliance, audit and security teams, from small teams starting GRC programmes to enterprise organisations, across sectors including financial services, technology, retail,…
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Computed from 4 filingsProvides digital debt collection services and software for businesses, using AI-driven platforms to manage consumer debt recovery, customer communications, payment plans and self‑service portals…
Sells to businesses, particularly enterprise and high-growth organisations needing first- and third-party consumer debt collection support. Serves teams operating across regulated markets in the UK,…
Financial Health
StrongStrong · Hiring · 22% CAGR over 3y
Location
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Computed from 5 filingsDevelops and operates an e‑commerce review platform for online stores, particularly Shopify merchants. Provides tools to collect customer product and store reviews, display them through website…
Serves B2B e-commerce merchants using Shopify, including dropshippers, new online stores and growing retailers, plus agency and technology partners in the e-commerce ecosystem.
Financial Health
HealthyHealthy · Hiring · 84% CAGR over 4y
Location
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Computed from 2 filingsDevelops AI software for property management that automates tenant communications, maintenance requests, contractor scheduling, compliance tracking, rent reminders and administrative tasks.…
Sells to UK property companies and property management teams, including letting agencies, portfolio landlords and managers of residential rental properties handling tenants, contractors, maintenance…
Financial Health
HealthyHealthy · Hiring · 350% CAGR over 1y
Location
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Computed from 5 filingsProvides AI-powered software for complaints management. The platform processes complaint data to generate customer response drafts, flag quality issues, produce root cause analysis and reporting, and…
Sells to B2B complaints, customer service, operations and quality teams in organisations handling customer complaints, including case handlers and team leaders responsible for compliance, reporting…
Financial Health
WeakWeak · Hiring · 28% CAGR over 4y
Location
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Computed from 3 filingsDevelops blockchain analytics software and data services used to trace cryptocurrency transactions, assess wallet and exchange risk, monitor transactions for compliance, and support investigations by…
Serves government agencies, law enforcement, regulators, tax authorities, crypto exchanges, financial institutions, insurance firms, cybersecurity companies and web3 businesses operating in digital…
Financial Health
WeakWeak · -10% CAGR over 2y
Location
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Computed from 5 filingsDevelops and provides cloud-based digital signage software that allows organisations to manage and schedule content across networked screens. Platform supports playlists, menu boards, advertising…
Serves B2B organisations managing screen networks, including retailers, fast food chains, universities, corporate teams, healthcare providers, manufacturers, retail media networks and resellers.
Financial Health
StrongStrong · Growing, Hiring · 27% CAGR over 4y
Location
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Computed from 3 filingsProvides an AI-powered platform that maps global supply chains and product networks, enabling businesses, logistics providers and government agencies to manage tariffs, monitor trade flows, assess…
Serves governments, customs and border regulators, large enterprises, suppliers and logistics providers involved in global trade, especially teams responsible for tariffs, trade compliance,…
Financial Health
StrongStrong · Hiring · 55% CAGR over 2y
Location
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Provides a software platform for managing information security and regulatory compliance. Automates controls, risk assessments, vendor management and policy tracking to help organisations meet…
Serves European startups, SMEs and mid-market B2B teams that need to meet security, privacy and regulatory requirements for clients, partners or sectors such as automotive and financial services.
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Computed from 5 filingsProvides software platform and related services for private capital management, including cap table management, fund administration, portfolio tracking, investor reporting, valuations and compliance…
Serves startups, venture capital and private equity firms, portfolio companies, limited partners and individual investors involved in private capital, including fund managers, CFOs, founders and…
Financial Health
HealthyHealthy · -68% CAGR over 4y
Location
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Computed from 5 filingsProvides a cybersecurity platform for vulnerability management, attack surface monitoring and cloud security. Scans infrastructure, web apps, APIs and containers to detect exposed assets,…
Serves B2B security and IT teams at companies with internet-facing infrastructure, cloud environments, web apps and APIs, especially lean teams managing security and compliance requirements such as…
Financial Health
StableStable · Hiring · 60% CAGR over 4y
Location
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How Merge 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.
Merge 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 Merge?
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