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Systems Integration Companies in Leicester: 41 Active Firms (2026)
Systems integration companies design, connect and support business technology environments for clients in and around Leicester.
Commercial buying is likely to sit with IT, operations and finance teams rather than a single software owner. The work is usually sold to SMEs and mid-market organisations that have outgrown point-to-point fixes, but are not building large internal engineering functions. Engagements tend to combine implementation, application integration, database work, infrastructure support and managed workflow maintenance, with project managers and technical consultants sharing delivery. For Leicester-area buyers, proximity matters: these suppliers are useful when legacy systems, supplier portals and line-of-business applications need to be joined without turning every change request into a national consultancy exercise.
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Leicester has 41 actively trading systems integration companies, making this a small local services market rather than a broad software cluster. Reported headcount across the cohort totals 321 people, so delivery capacity is spread across compact teams rather than concentrated in a small set of employers. The commercial profile looks service-led: implementation, support and integration work can sustain specialist operators without requiring venture-scale sales teams or national channel partnerships. For local buyers, that points to a supplier base built around continuity, site access and knowledge of legacy estates as much as around new platform deployment.
Regulatory exposure usually follows the client environment rather than the integrator’s own product model. Work involving personal information brings GDPR duties and ICO expectations around access controls, processing instructions and incident handling. Integrations for financial-services clients may bring FCA-facing evidence on resilience, outsourcing and operational risk, even when the supplier itself is outside direct authorisation. Market structure matters too: implementation partners sit between software vendors, managed service providers and in-house IT teams, so contracts often revolve around service levels, change control, data migration risk and who carries responsibility when connected systems fail.
Further expansion appears likely to be gradual and relationship-led. The cohort has the feel of a local delivery market, with many suppliers valued for practical systems knowledge, onsite availability and support continuity rather than for proprietary software assets. Demand tends to rise when clients replace ageing finance, customer management or workflow tools, because the integration burden lands with whoever understands the existing estate. Scarcity of sizeable scale-up candidates may limit acquisition activity, although managed-service groups could still absorb specialist teams where client books, technical certifications and recurring support contracts fit their own delivery model.
41
Active firms
2026
2
Above £5M
reported revenue
2
Since 2022
new incorporations
Key facts
About 4% of the trading cohort reports turnover above £5M (2 of 41 firms) — the rest sits below that revenue band.
4% of the cohort was incorporated since 2022 (2 firms), so a sizeable share is in its first few filing cycles.
Leicester systems integrators sit between internal IT teams and software vendors, joining applications, infrastructure and support processes for business buyers.
Delivery tends to be project-led, managed-support-led or a hybrid of implementation and ongoing service work.
The local market appears oriented towards small and lower mid-market provision rather than national outsourcing programmes.
Procurement usually centres on compatibility, support continuity and clear responsibility boundaries between client IT teams, integrators and third-party software suppliers.
Top Leicester Systems Integration companies
Digital Planning Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsDesigns and builds digital systems and software platforms for businesses, including web and e‑commerce applications, AI and decision‑support tools, and workflow automation and integration. Also…
Serves B2B organisations in professional services, logistics, healthcare and manufacturing, targeting teams and leaders seeking digital engineering, automation and decision-support systems.
Financial Health
StrongStrong · Growing, Hiring · 53% CAGR over 4y
Location
Realtime IT Solutions Ltd
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides managed IT support and technology services for businesses, including helpdesk support, cloud solutions (Microsoft 365 and Azure), cybersecurity, backup and disaster recovery, VoIP phone…
Serves businesses of all sizes in Leicester, Leicestershire and the East Midlands, including local SMEs needing outsourced IT, communications, cybersecurity and connectivity support for offices and…
Financial Health
HealthyHealthy · Hiring · 10% CAGR over 2y
Location
Arribatec UK Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides IT and business consulting services including ERP implementation, cloud infrastructure, systems integration, data and analytics platforms, security and compliance, and software development.…
Sells primarily to businesses and public sector organisations needing business applications, IT and management systems, with named focus on banking, construction, energy, higher education, health,…
Financial Health
StableStable · Profitable · 5% CAGR over 2y
Location
TULIPTECH LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides software, web and mobile application development, IT infrastructure and cloud solutions, Microsoft technology services, cybersecurity support, and development of media streaming platforms.…
Serves businesses of all sizes, from small firms needing IT infrastructure to large enterprises pursuing cloud migration, digital transformation, media streaming or virtual event capabilities.
Financial Health
HealthyHealthy · Hiring · 32% CAGR over 4y
Location
GENESIS NETWORKING SYSTEMS LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides IT and communications services including Bitrix24 CRM implementation and support, cloud services, custom software, web and mobile app development, network security, IP telephony, call centre…
Serves businesses and organizations of all sizes, from startups to large enterprises, including teams managing sales, projects, documents, collaboration and call-centre operations.
Financial Health
HealthyHealthy · -62% CAGR over 4y
Location
HAIGH CONSULTANCY SERVICES LIMITED
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsProvides IT consultancy and develops software for electronic billing, document management, and data workflow automation. Offers hosted billing systems, EDI delivery, hybrid mail, and document archive…
Serves B2B clients including UK mailing houses, postal operators, transactional printers, and large organisations in financial services, utilities, leisure and insurance with high-volume billing and…
Financial Health
HealthyHealthy · -70% CAGR over 4y
Location
INNOWISE SOLUTIONS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides IT consulting and enterprise technology services, including business intelligence and analytics, SAP and Oracle ERP implementation and support, process mining, cloud and hybrid cloud…
Serves enterprises and SME businesses needing IT and enterprise technology support, including organisations using SAP or Oracle ERP, business intelligence, cloud, automation and cyber security…
Financial Health
DistressedDistressed · -11% CAGR over 4y
Location
HANAN IT SOLUTIONS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides IT services including web and custom software development, web application development, and enterprise mobility solutions. Offers SAP consulting, SAP online and onsite training, cloud,…
Serves businesses needing custom software, web applications, enterprise mobility, SAP consulting, IT support and technical training, including organisations with technical and business users managing…
Financial Health
StrongStrong · Hiring · 14% CAGR over 4y
Location
EMPLOYEE ZERO LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides managed IT services and consultancy for businesses, including 24/7 technical support, cloud infrastructure, cybersecurity, network design, and IT projects. Supports Apple, Microsoft, Google…
Serves businesses worldwide, especially organisations using Apple, Microsoft, Google Workspace, AWS, cloud and network environments, with buyers such as IT, operations and security leaders.
Financial Health
WeakWeak · -5% CAGR over 4y
Location
Wired In Commerce Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops custom e‑commerce websites and platforms for businesses, providing strategy, UX design, system integration, SEO, and ongoing support. Works with technologies including nopCommerce, Shopify,…
Sells to businesses needing custom ecommerce websites, especially B2B firms with complex requirements. Targets ecommerce teams and decision-makers seeking nopCommerce, Shopify or headless builds,…
Financial Health
HealthyHealthy · 0% CAGR over 2y
Location
MTS Assets Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides managed IT support and technology services for schools and businesses, including network monitoring, Office 365, email filtering, cybersecurity, cloud telephony, web services, and supply of…
Serves schools, colleges and owner-managed SMEs that need external IT support, including education leaders, teachers and business owners managing technology infrastructure, security, communications…
Financial Health
StrongStrong
Location
Forward Microsystems Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDevelops industrial carousel and automated storage control software with ERP/MRP integration. Also designs and supplies LED lighting products and provides media display and software solutions for…
Serves businesses needing industrial carousel software, ERP/MRP-integrated automation, LED lighting systems and media solutions, particularly industrial and warehouse operations seeking storage and…
Financial Health
WeakWeak · 0% CAGR over 3y
Location
Mussa IT Service Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides managed IT services including service desk support, cloud and network management, cybersecurity, user provisioning, unified communications, and vCIO advisory. Supports businesses by…
Serves businesses on a B2B basis, particularly organisations in life sciences, pharmaceuticals, green technology, startups, tough tech, medical devices, construction, manufacturing, and venture…
Financial Health
StableStable · Hiring · 14% CAGR over 4y
Location
Transpose Software Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and develops custom software applications and systems. Analyses client processes and requirements, researches technical approaches, and builds software solutions across the project lifecycle,…
Financial Health
HealthyHealthy · -9% CAGR over 2y
Location
INTERIS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides IT consultancy, software development and enterprise application integration services. Specialises in QAD ERP customisation, implementation and support, and develops Interlink, a platform for…
Serves businesses using QAD ERP and enterprise applications, particularly in automotive, healthcare, retail and manufacturing, including organisations with cloud and on-premise IT environments.
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
Integrated Computer Utilities Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides IT support and managed IT services for businesses, including IT maintenance, cloud services, hosting, consultancy, and business continuity planning. Offers monitoring, system management, and…
Serves SME businesses across Derby, Nottingham, Leicester, Sheffield, Stafford, South Yorkshire and surrounding areas, across a range of industries needing outsourced IT support and consultancy.
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 2y
Location
Entegraty Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides IT support and managed IT services, including remote technical assistance via ScreenConnect, TeamViewer and Splashtop, plus CRM and business IT solutions, system maintenance, and…
Serves businesses in Leicester that need outsourced IT support, managed services and CRM-related assistance.
Financial Health
StableStable · Hiring · 15% CAGR over 2y
Location
Better-IT Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides managed IT support and technology services for businesses, including hardware and infrastructure management, cloud and Microsoft 365 solutions, cybersecurity services, backup and disaster…
Serves businesses and modern workplaces in Leicester, Leicestershire and the East Midlands, with remote support for UK organisations needing managed IT, Microsoft 365 and cyber security support.
Financial Health
StrongStrong · Hiring · 27% CAGR over 2y
Location
Rod Barlow Digital Consultancy Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides technology consulting for retailers, museums, visitor attractions and charities. Advises on and implements systems including CRM and membership platforms, ticketing, retail management and…
Serves B2B organisations in visitor attractions, museums, charities and retail, including teams responsible for CRM, ticketing, ecommerce, point-of-sale, stock control and finance systems.
Financial Health
StrongStrong · Hiring · 15% CAGR over 2y
Location
RSULT UK LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides NetSuite ERP consulting and implementation services, including process analysis, solution design, system configuration, integrations, user training, and ongoing support. Also develops…
Serves B2B organisations using or evaluating NetSuite, especially food and beverage firms, private equity-backed companies, crypto businesses and manufacturers, plus finance teams considering related…
Financial Health
StrongStrong · Hiring · 11% CAGR over 5y
Location
STRATUS21 LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops custom web‑based business applications, cloud and mobile apps, and e‑commerce websites using Magento. Provides web development, UX design, and integration of online platforms with existing…
Serves small to large businesses across varied industries, particularly organisations needing web-based business applications, e-commerce platforms, and integration with ERP, customer, supplier and…
Financial Health
WeakWeak · -12% CAGR over 2y
Location
Computerlink (Leicester) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides managed IT support and technology services for businesses, including Microsoft 365 management, network installation and testing, cybersecurity, backup and disaster recovery, VoIP systems,…
Serves B2B customers in Leicestershire, especially small and mid-sized organisations without in-house IT capacity or requiring support for Microsoft environments, networks, office moves, and IT…
Financial Health
HealthyHealthy · Hiring · 11% CAGR over 4y
Location
TUNSTALL SMITH KING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides SAP consulting services including implementation, optimisation, and project support for enterprise IT systems. Advises organisations on SAP strategy, system configuration, and integration to…
Serves enterprise businesses using SAP, targeting IT and operations leaders seeking external consultants for complex SAP projects and operational efficiency initiatives.
Financial Health
HealthyHealthy · Hiring · 19% CAGR over 4y
Location
Infonote Datasystems Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops bespoke software and cross‑platform mobile applications for businesses. Services include database and API development, system integration with enterprise platforms, data migration, and…
Sells to UK businesses and organisations needing bespoke software and app development, including enterprise teams using SAP, Microsoft Dynamics, SharePoint, Sage or Oracle, plus buyers in supply…
Financial Health
WeakWeak · Hiring · 5% CAGR over 2y
Location
Parkway (Leics) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides managed IT support and consultancy for businesses, including network setup and maintenance, cybersecurity monitoring, Microsoft 365 and server solutions, remote access systems, data backup…
Sells to businesses across the Midlands needing outsourced IT support, from small firms to multi-site organisations with 2–200 computers. Serves companies seeking ongoing or ad hoc support, including…
Financial Health
StrongStrong · Growing, Hiring · 9% CAGR over 4y
Location
INTEGRATED POWER TECHNOLOGY UK LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
DATA IMAGE GROUP LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides information management and digital surveillance solutions, including systems for data, document and video capture, storage and retrieval. Supplies and integrates network, web and wireless…
Sells to businesses and public sector organisations needing information management, surveillance and security systems, especially in financial services, education, manufacturing, healthcare,…
Financial Health
DistressedDistressed · -75% CAGR over 4y
Location
Abtec Building Technologies Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and implements smart building and IT infrastructure systems, including network cabling, cloud integration and security. Provides consultancy, design support and installation services to…
Sells to businesses, especially IT managers and IT decision-makers, plus building developers and specifiers. Serves organisations investing in smart buildings, IT infrastructure, security, cloud and…
Financial Health
WeakWeak · -12% CAGR over 2y
Location
Sensible Computing Solutions Ltd
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsSupplies and installs computer hardware and business software for small and medium-sized organisations. Provides IT support, network security, backup systems, Microsoft server support, cloud and…
Sells to small and medium-sized businesses needing business IT systems and support, including owner-managed firms using Microsoft server environments, backup/security tools, network infrastructure,…
Financial Health
StableStable · 0% CAGR over 3y
Location
Microtech Digital Services LLP
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides managed IT support and consultancy, including helpdesk services, IT strategy design, cybersecurity, Microsoft 365 solutions, data backup and storage, and network design, implementation and…
Serves UK businesses, particularly growing SMEs, with emphasis on firms in food and drink, manufacturing, retail, technology, construction and finance, including accountancy practices, builders,…
Financial Health
StableStable · Hiring · 10% CAGR over 4y
Location
Kixo Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides outsourced IT support for businesses, including server, network and software support, system monitoring and helpdesk services. Supplies business internet connectivity, VoIP phone systems and…
Serves local and multinational businesses seeking outsourced IT support, with IT support customers across the Midlands and UK-wide business buyers of connectivity and phone services.
Financial Health
StrongStrong · Hiring · 22% CAGR over 2y
Location
Apograph Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides managed IT support and consulting for businesses, including 24/7 system monitoring, cybersecurity, cloud and Microsoft services, license management, virtual desktop infrastructure, and…
Serves small and mid-sized businesses with 3–300 users, including creative agencies, franchisors, financial firms, legal practices, manufacturers, property groups, logistics companies, design and…
Financial Health
HealthyHealthy · Hiring · 9% CAGR over 4y
Location
Prime Solutions 4 Business Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides IT support services for businesses, including network design, help desk support, installation of PC hardware, software and cabling, server setup, spam and antivirus protection, broadband…
Serves businesses in Coventry and the Midlands needing outsourced IT support, help desk assistance, network design, hardware/software installation, servers, security and backup services.
Financial Health
WeakWeak · 0% CAGR over 4y
Location
WELCOMM COMMUNICATIONS LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides managed business communications and technology services, including mobile phone contracts, VoIP phone systems, contact centre platforms, IT support, cloud services, data connectivity, and…
Sells to businesses across the UK, from SMEs to larger organisations, buying telecoms, IT and utilities support. Serves operations, IT and customer service teams, including transport fleets needing…
Financial Health
HealthyHealthy · -69% CAGR over 4y
Location
ONE SOURCE IT LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides IT maintenance and support services including multi‑vendor hardware maintenance, installation and configuration, virtualisation, and storage solutions. Supplies servers, storage, networking…
Serves businesses needing IT infrastructure support and procurement, including buyers of servers, storage, networking and software licences. Targets organisations seeking multi-vendor maintenance,…
Financial Health
WeakWeak · 0% CAGR over 4y
Location
Aarya Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides IT consultancy and software development services, including data analytics and business intelligence solutions, cloud infrastructure deployment on platforms such as AWS, GCP and Azure, and…
Serves startups and B2B/B2C businesses, with stated experience across fintech, logistics, FMCG and other industries. Targets business owners and product teams seeking IT and data capability.
Financial Health
DistressedDistressed · 0% CAGR over 2y
Location
Kudos Manufacturing Solutions Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides manufacturing planning and scheduling software solutions, including Siemens Opcenter APS products, along with implementation, configuration, and user training. Helps manufacturers optimise…
Serves B2B manufacturing organisations, especially FMCG producers with complex production planning needs, as well as discrete manufacturers. Targets planning, operations and supply chain teams…
Financial Health
HealthyHealthy · Hiring · 7% CAGR over 4y
Location
ALTERNATIVE COOLING SOLUTIONS LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides managed IT services and consultancy for businesses, including IT support, cybersecurity, cloud computing, network security, hosted VoIP, compliant archiving, and Microsoft 365 and Azure…
Serves UK businesses seeking outsourced IT support and consultancy, including organisations needing cloud, cybersecurity, VoIP and Microsoft services; buyers include business owners, operations…
Financial Health
StrongStrong · Growing, Hiring · 41% CAGR over 2y
Location
Maclean Data Comms Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides managed IT support and network services, including monitoring and management of IT systems, fibre installation and structured data cabling. Also implements Microsoft 365 solutions, managed…
Sells to businesses and schools across the Midlands, serving organisations of varying sizes and industries that need IT support, network services, Microsoft 365 and interactive display solutions.
Financial Health
WeakWeak · -6% CAGR over 4y
Location
ERUD I.T LIMITED
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsProvides managed IT support, cybersecurity, and IT consultancy for businesses. Supplies and installs computer hardware, servers, networking and telecoms systems, Microsoft 365 and VoIP, plus CCTV…
Serves small and medium-sized businesses needing outsourced IT support, cyber security and digital services, including organisations with renewables, SCADA, connectivity and surveillance requirements.
Financial Health
StrongStrong · Growing, Hiring · 6% CAGR over 4y
Location
Intalect Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides managed IT support and cybersecurity services for businesses, including network security, help desk support, cloud and infrastructure management, phone systems, and data backup and recovery.…
Serves small and medium-sized businesses, targeting owners and managers who need outsourced IT, cyber security, backup, phone system and help desk support.
Financial Health
StrongStrong · Growing, Hiring · 4% CAGR over 4y
Location
TWIN3 LIMITED
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsProvides bespoke software development services including web and mobile application development, backend systems and APIs, AWS cloud development and migration, blockchain solutions, project strategy…
Serves UK businesses with custom digital product or platform needs, from pre-launch ventures to established organisations, typically buyers responsible for software projects, cloud systems,…
Financial Health
WeakWeak · -24% CAGR over 4y
Location
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How Leicester Systems Integration companies work and how to sell to them
What they do
Systems integrators make money by turning a client’s existing technology estate into something that works across departments. Revenue usually comes from scoped implementation projects, time-and-materials consultancy, data migration work, recurring support retainers and managed workflow maintenance. Some also pass through third-party licence, hosting or hardware costs, though the margin usually sits in services rather than resale. Engagements often begin with a short audit, a remediation backlog or a specific application change, then expand into support when the integrator becomes the team that understands how the connected systems behave in production.
Who they sell to
Most sell to owner-managed SMEs, regional mid-market companies and local operating sites of larger groups that need practical integration capacity without hiring a sizeable internal engineering team. The buyer is typically an IT manager, operations director, finance director or procurement lead, with the managing director still close to the decision in smaller accounts. Sales are usually direct and relationship-led, helped by referrals from accountants, IT support providers and software resellers. Support work can be agreed quickly when an incident or backlog is visible; larger migration and integration programmes tend to move through workshops, written scopes, security checks and staged approvals.
What they buy
Most systems integration firms tend to spend on tools that protect delivery margin and make client estates easier to support. Useful categories include professional-services automation, ticketing, project management, documentation, knowledge management, remote monitoring, backup, identity management, endpoint security, vulnerability testing and change-control software. Delivery teams also buy cloud hosting, test environments, data-migration utilities, API tooling and contractor capacity when a client programme needs skills outside the core team. Finance, HR, recruitment, training and insurance services can be relevant, especially where the firm is formalising recurring managed-service work rather than living from one implementation project to the next.
Why and how to sell to them
Buying intent tends to appear when an integrator wins a larger support contract, takes on a client with a messy legacy estate, hires delivery staff, adds a managed-service offer or has to evidence controls for GDPR, cyber insurance or a larger customer’s procurement process. Pain points are practical: under-scoped projects, undocumented dependencies, engineers being pulled between support and billable work, and thin handover from project to support teams. Outbound works better when it links to margin, risk and delivery capacity: fewer avoidable call-outs, clearer service evidence, faster onboarding of new consultants and less rework after system changes.
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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