IT Integration Companies in London: 1,123 Active Firms (2026)
IT integration companies in London connect software, data, infrastructure and cloud platforms for organisations across the capital.
Buying centres tend to sit with CIO, operations, finance transformation and security teams rather than a single software owner. London integrators are usually brought in when established organisations need applications to exchange data cleanly, cloud estates to be migrated without disrupting live services, or managed environments to be kept supportable after implementation. The commercial pattern is project-led consultancy followed by support retainers, with buyers skewing towards mid-market and enterprise organisations. Professional services, regulated sectors, public sector bodies and technology companies all appear in the addressable base, so evidence of delivery governance often matters as much as engineering depth.
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London has 1,123 actively trading IT integration companies, giving researchers a sizeable but not diffuse local supplier base. Reported employment across the cohort is 3,715 staff, and all 119 firms with headcount coverage report some employment. The shape is consistent with an implementation-heavy market: many firms are likely to be consultancy-led rather than product-led, with capacity concentrated in delivery teams, service desks, project management and account support. For buyers, the practical distinction is less about local availability and more about which providers can sustain governance across enterprise estates.
Procurement and assurance requirements are often set by the customer rather than by an industry-specific regulator. Providers serving regulated clients, public sector bodies and professional-services buyers tend to face supplier due diligence, security questionnaires, change-control evidence and audit trails before work moves beyond scoping. Market structure is mixed: 103 London integrators report turnover above £5M, while many others remain specialist consultancies or support-led operators. That creates a tiered buying market, with larger revenue bands better placed for multi-site delivery and smaller firms competing on platform focus, sector knowledge or responsiveness.
Demand appears likely to follow the shape of enterprise IT estates rather than a particular technology cycle. Buyers keep adding cloud services, legacy applications and security controls, which tends to create integration work even when discretionary software budgets tighten. The scarcer operators are likely to be those that can combine architecture, migration, support and governance within the same commercial relationship. Smaller consultancies may remain viable where they own a narrow platform specialism, but consolidation pressure should persist where buyers prefer shorter supplier rosters and clearer accountability for live environments.
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
1,123
Active firms
2026
103
Above £5M
reported revenue
112
Newer firms
incorporated since 2022
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Key facts
About 9% of the trading cohort reports turnover above £5M (103 of 1,123 firms) — the rest sits below that revenue band.
9% of the cohort was incorporated since 2022 (112 firms), so a sizeable share is in its first few filing cycles.
Systems integrators connect software, data, infrastructure and cloud platforms that would otherwise sit across separate operational stacks.
Buying patterns tend to combine project delivery with support retainers, particularly around cloud migrations and application rollouts.
The segment is services-led, with consultancies, implementation partners and managed-service providers competing around delivery capacity rather than product ownership.
Headcount can be a weak scale marker in integration work, where revenue may reflect project delivery, subcontracting and platform migration costs as well as permanent staff.
Top London IT Integration companies
Financial sub-scores
Computed from 4 filingsProvides IT consultancy and implementation services focused on Microsoft cloud technologies. Designs and deploys business applications, data and AI platforms, automation, ERP and customer engagement…
Serves enterprise and public-sector organisations across health and social care, energy, resources, mining, manufacturing, construction, facilities management, government, not-for-profit and…
Financial Health
StrongStrong · Hiring · 29% CAGR over 3y
Location
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Computed from 5 filingsProvides IT consulting, systems implementation, outsourcing and managed support services, including ERP and CRM platforms, e‑commerce systems, cloud migration, data analytics, automation, and…
Serves enterprises and public sector organisations in retail, consumer goods, healthcare, life sciences, banking, financial services, insurance and telecoms seeking technology-led transformation.
Financial Health
StableStable · Hiring · 100% CAGR over 4y
Location
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Computed from 5 filingsProvides IT consulting and engineering services including data centre design and colocation support, network and cybersecurity solutions, multi‑cloud architecture and management, digital…
Serves B2B organisations needing complex IT environments, including banks, maritime service providers, crypto exchanges, security vendors, housing providers and professional services firms.
Financial Health
StableStable · Hiring · 5% CAGR over 4y
Location
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Computed from 5 filingsProvides IT consultancy and delivery assurance for cloud and infrastructure transformation projects. Services include solution architecture, programme assurance, cloud and application migration,…
Serves major enterprise-scale organisations in the UK, including public sector bodies and large businesses undertaking digital transformation, cloud, infrastructure and security programmes.
Financial Health
HealthyHealthy · Hiring · 4% CAGR over 4y
Location
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Computed from 5 filingsProvides IT systems integration and managed services focused on open‑source software. Offers consultancy, deployment, training, support and outsourcing for identity management, infrastructure, data…
Serves B2B and public-sector organisations, including government bodies, corporates, financial services firms, healthcare providers, SMEs and education institutions using open-source IT systems.
Financial Health
WeakWeak · -3% CAGR over 4y
Location
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Computed from 5 filingsProvides system integration and process automation services, implementing platforms such as Salesforce and MuleSoft. Offers data integration, AI enablement, managed support, training, and…
Serves public sector organisations—police forces, NHS bodies, local authorities, social housing and higher education providers—alongside large enterprises in sectors such as insurance and defence.
Financial Health
WeakWeak · 1% CAGR over 4y
Location
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Computed from 5 filingsProvides digital technology and platform engineering services, including development of web and mobile applications, API‑led systems integration, and design and management of secure cloud and…
Serves blue-chip private-sector organisations and public sector bodies, plus UK businesses using HMRC Making Tax Digital tools. Targets buyers needing secure digital platforms, cloud integration and…
Financial Health
HealthyHealthy · -66% CAGR over 4y
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Computed from 5 filingsProvides IT consulting and managed services including data engineering, business intelligence and analytics, AI and automation, cybersecurity, and cloud and DevOps. Supports organisations with…
Serves enterprise organisations in the public and private sectors, with strong emphasis on UK government departments, regulated public bodies and critical infrastructure providers undertaking digital…
Financial Health
StrongStrong · Growing, Hiring · 37% CAGR over 4y
Location
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Computed from 5 filingsProvides cloud consulting, implementation and managed services focused on Oracle and Microsoft Azure platforms. Services include ERP, HCM and SCM cloud deployment, application modernisation, data…
Serves B2B organisations using Oracle, Azure and hybrid cloud environments, targeting enterprise IT, finance, HR, operations and leadership teams managing cloud transformation, data platforms and…
Financial Health
StrongStrong · Growing, Hiring · 16% CAGR over 6y
Location
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Computed from 5 filingsProvides IT and business consulting focused on SAP enterprise systems, data analytics and planning tools. Offers project and programme management, application development, AI and cloud solutions, and…
Serves businesses and organisations investing in SAP, BI, analytics and IT support, including finance, education, business and insurance sectors; also targets individual travellers through its travel…
Financial Health
StrongStrong · Growing, Hiring · 28% CAGR over 4y
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Computed from 5 filingsProvides IT consulting and software services including Microsoft platform development, Azure cloud adoption, application modernisation, artificial intelligence solutions, data analytics, DevOps/SRE,…
Serves B2B clients in insurance, financial services, banking and healthcare, particularly organisations seeking technology partners for digital transformation, cloud adoption, data management and…
Financial Health
StrongStrong · Hiring · 35% CAGR over 4y
Location
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Computed from 5 filingsProvides technology and digital transformation consultancy including software engineering, cloud and DevOps platform development, data and AI services, testing, product delivery, and architecture…
Serves UK government, public sector bodies and critical enterprise organisations, including energy and utilities, telecommunications, healthcare, financial services and defence buyers undertaking…
Financial Health
HealthyHealthy · -56% CAGR over 5y
Location
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Computed from 5 filingsProvides enterprise software and consulting services focused on data, AI, and digital transformation. Develops and implements data platforms, analytics, automation, chatbots, and cloud solutions,…
Serves enterprise technology, operations and digital transformation teams, including organisations in oil and gas, energy, manufacturing, consumer goods, renewable energy, healthcare and the public…
Financial Health
StrongStrong · Hiring · 11% CAGR over 4y
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Computed from 5 filingsProvides IT consultancy and software solutions focused on Microsoft technologies. Services include cloud strategy, migration and modernisation for Azure and Microsoft 365, workflow automation,…
Serves enterprise and mid-market organisations invested in Microsoft 365, Azure and Power Platform, especially IT, operations, compliance and HR teams managing cloud, data, governance, intranet and…
Financial Health
StrongStrong · Growing, Hiring · 14% CAGR over 4y
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Computed from 5 filingsProvides IT consulting and development services, including bespoke software applications, business intelligence and data warehousing solutions, CRM and ERP systems, HR consulting, and IT…
Serves public and private sector organisations, including businesses in banking, logistics and other domains across the UK, Europe and Asia.
Financial Health
StrongStrong · Hiring · 5% CAGR over 4y
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Provides managed IT services supporting business‑critical systems, including remote database administration, software and web/mobile application development, cloud infrastructure on Microsoft Azure,…
Serves medium and large enterprises needing business-critical IT support, especially companies in the energy and telecoms sectors, while also targeting small businesses seeking technology support to…
Financial Health
N/AN/A
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Computed from 5 filingsProvides IT services including infrastructure management, application development, software testing, web development and hosting, and managed IT support. Delivers application maintenance and…
Serves B2B enterprise clients and growing technology companies, particularly in banking, financial services, insurance, telecommunications, energy, chemicals, logistics, travel, transportation,…
Financial Health
StableStable · -24% CAGR over 4y
Location
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Computed from 5 filingsProvides managed IT services, cybersecurity, cloud and AI solutions, and business software implementation. Offers process automation, data analytics, Microsoft 365 and Dynamics systems, intranet and…
Serves UK businesses and organisations seeking outsourced or co-managed IT, cyber security, cloud, AI, automation and Microsoft business application support, typically engaging IT, operations and…
Financial Health
HealthyHealthy · Hiring · 14% CAGR over 4y
Location
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Computed from 5 filingsProvides managed IT services, cloud infrastructure, and technology consulting focused on Microsoft platforms. Services include Microsoft 365 and Azure deployment, endpoint management, cybersecurity,…
Serves UK public sector bodies and commercial organisations, including central and local government, healthcare, education, not-for-profits, professional services, finance, legal, insurance,…
Financial Health
DistressedDistressed · -65% CAGR over 4y
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Computed from 5 filingsProvides software engineering, systems integration and technical consultancy to develop secure digital collaboration platforms. Services include cloud adoption, DevSecOps implementation, AI-enabled…
Serves security-conscious public sector and enterprise organisations, especially UK national security, defence and critical environments, plus partners and suppliers including specialist providers…
Financial Health
WeakWeak · -70% CAGR over 4y
Location
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Computed from 5 filingsProvides software development and IT consulting services, including cloud migration, enterprise application development, and systems integration. Builds case management systems, self‑service portals,…
Sells to businesses undergoing digital transformation, particularly organisations in housing, NHS and healthcare. Targets decision-makers needing software, cloud, case management, Microsoft…
Financial Health
StrongStrong · Growing, Hiring · 37% CAGR over 4y
Location
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Computed from 4 filingsProvides digital IT services including application development with low‑code platforms, intelligent automation, business intelligence and AI solutions. Also delivers cloud adoption and security,…
Targets IT and business leaders at UK organisations undertaking digital transformation, particularly those with cloud, workplace, application innovation and networking requirements.
Financial Health
WeakWeak
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Computed from 3 filingsProvides managed IT services for businesses including IT support, cybersecurity, cloud consultancy, AI and data advisory, unified communications, network cabling and relocation, and web design and…
Serves UK businesses and organisations, including charities, manufacturers, finance firms, legal practices, property and built environment companies, sports and leisure organisations, and education…
Financial Health
StableStable · 1% CAGR over 2y
Location
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Computed from 3 filingsProvides IT consultancy and software development services supporting digital transformation projects. Delivers managed digital delivery, cloud (Azure and AWS) solutions, data analytics, automation,…
Serves public-sector bodies and private businesses needing digital delivery support, including organisations seeking agile teams, individual digital specialists, cloud, data, QA and automation…
Financial Health
WeakWeak · Hiring · 36% CAGR over 2y
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Computed from 3 filingsProvides managed IT support and outsourcing services for businesses, including infrastructure monitoring and management, Microsoft 365 support and migration, Azure cloud consultancy, cybersecurity…
Serves London-based businesses and professional organisations, with sector focus on financial services, alternative investment firms, UHNW/family offices, renewable energy companies, and…
Financial Health
StableStable · -6% CAGR over 2y
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Computed from 5 filingsProvides IT consulting and support services focused on digital transformation and Microsoft cloud technologies. Offers professional services, managed IT services, enterprise network solutions, and…
Serves businesses and public sector organisations undertaking digital transformation, especially IT and digital teams using Microsoft Cloud technologies, including enterprise clients, laboratory…
Financial Health
DistressedDistressed · -53% CAGR over 5y
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Computed from 5 filingsProvides business and technology consulting services including digital transformation, systems integration, data analytics, and cloud engineering. Supports implementation and optimisation of…
Serves enterprise businesses in customer-centric sectors, including retail and specialty brands, logistics and transport, FMCG, financial services and fintech, hospitality, travel, leisure, media and…
Financial Health
StrongStrong
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Computed from 3 filingsProvides consulting and implementation services for Oracle ERP and project management systems. Services include business process assessment, cloud migration, system integration, application…
Serves project-centric enterprises and public sector organisations using Oracle ERP, including aerospace and defence, construction and engineering, energy, utilities, high tech, professional…
Financial Health
WeakWeak · -24% CAGR over 2y
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Computed from 5 filingsProvides IT consulting and implementation of customer engagement and CRM systems, including cloud CX platforms, order management, business intelligence, data governance, portals, and service…
Serves B2B clients in telecommunications and financial services, targeting sales, service, marketing, IT and operations teams responsible for customer engagement, order management, analytics, data…
Financial Health
StrongStrong · Profitable, Growing · 0% CAGR over 4y
Location
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Computed from 5 filingsDevelops custom enterprise software and digital platforms. Provides consulting, software engineering, cloud and data engineering, AI solutions, UX design, testing, and application support to help…
Serves large enterprises and public sector organisations, especially in banking, insurance, telecoms, iGaming and security, with buyers including technology and digital transformation leaders.
Financial Health
StableStable · -55% CAGR over 4y
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Computed from 5 filingsProvides IT consultancy focused on enterprise data integration and software engineering. Services include API integration, data migration and archiving, middleware and EPR integration, product…
Serves UK public and private sector organisations, particularly in healthcare, financial services, education, retail, commercial and recruitment, including enterprise teams needing data integration…
Financial Health
WeakWeak · -62% CAGR over 4y
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Computed from 5 filingsProvides IT consultancy and professional services including data centre migration and installation, infrastructure deployment, network and Wi‑Fi solutions, cloud and Microsoft 365 services, cyber…
Serves businesses and organisations with data centre, cloud and network environments, targeting IT leaders managing migrations, infrastructure projects, Microsoft 365, cybersecurity, Wi-Fi and IT…
Financial Health
DistressedDistressed · 0% CAGR over 4y
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Computed from 5 filingsProvides IT consulting and managed services including cloud solutions, cloud security, datacenter and network architecture, wireless and mobility systems, collaboration platforms, connectivity…
Serves business and public-sector clients, including organisations in financial services, retail, healthcare, professional services, aviation/transportation, legal and government sectors, with a…
Financial Health
HealthyHealthy
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Computed from 5 filingsProvides digital and cloud consulting and engineering services including cloud migration and optimisation, managed hybrid cloud operations, DevOps implementation, and software-defined networking…
Serves B2B organisations needing digital transformation, including enterprises in media, data centres, energy and technology sectors, with buyers such as operations, ICT and strategic planning…
Financial Health
StrongStrong · Growing, Hiring · 40% CAGR over 4y
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Computed from 5 filingsProvides software development and IT consulting services, including enterprise and hospitality management systems, ERP integration, web and mobile application development, retail POS solutions,…
Serves B2B enterprise and mid-market clients needing IT services, including cruise operators, retailers, hospitality businesses, and organisations seeking software development, ERP/PMS support,…
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
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Computed from 5 filingsProvides data and technology consultancy services including data infrastructure design, AI and analytics development, system integration and migration, and technology strategy advice. Builds…
Serves B2B enterprise clients in complex, regulated sectors, including financial services, legal, biotechnology, pharma, healthcare and renewable energy, targeting senior technology, data and…
Financial Health
StrongStrong · Hiring · 7% CAGR over 4y
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Computed from 4 filingsProvides enterprise software solutions and consulting for asset‑intensive industries. Implements and supports systems for financial management, asset management, ESG reporting and procurement using…
Serves asset-intensive businesses globally, especially energy, transportation, mining and extraction companies, plus service providers to those sectors, targeting finance, asset management, ESG and…
Financial Health
StrongStrong · Growing, Hiring · 5% CAGR over 3y
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Computed from 5 filingsProvides software development and IT consulting services, including application development, system integration, cloud solutions, data analytics, cybersecurity, and enterprise platforms such as ERP,…
Serves enterprises and SMBs in healthcare, finance, manufacturing, retail and ecommerce, insurance, software and hi-tech, and professional services.
Financial Health
HealthyHealthy · Profitable · -8% CAGR over 4y
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Computed from 5 filingsProvides IT infrastructure services, software development, cybersecurity, and hybrid cloud solutions, supporting technology operations for iGaming, financial services, and enterprise organisations,…
Serves B2B customers in the iGaming, finance and enterprise sectors, with a focus on organisations operating in the UK and Malta.
Financial Health
StableStable · Hiring · 3% CAGR over 4y
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Computed from 5 filingsProvides digital transformation consultancy for government and public sector organisations, including strategy, service design, software engineering, cloud architecture, automation and AI…
Serves public sector organisations and government decision-makers, particularly teams in border security, national security and wider government departments or statutory bodies responsible for…
Financial Health
HealthyHealthy · Hiring · 20% CAGR over 4y
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Computed from 5 filingsProvides data management and business intelligence consulting, including enterprise data warehousing, analytics, data integration and migration, data governance and quality, and enterprise…
Serves large enterprises, especially financial services firms and FTSE 100 organisations, with buyers in data, analytics, risk, compliance, architecture and project delivery teams across EMEA, Asia…
Financial Health
WeakWeak · -73% CAGR over 4y
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Computed from 5 filingsProvides managed IT services including IT management, technical support, cybersecurity, infrastructure configuration, software licensing, and hosted application support. Advises businesses on IT…
Serves B2B clients, particularly legal, finance and media firms, including chambers, solicitors, property groups, wealth and investment firms, and design agencies.
Financial Health
StrongStrong · Growing, Hiring · 24% CAGR over 4y
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Computed from 5 filingsDesigns, deploys and supports contact centre and customer experience platforms, including cloud and on‑premise solutions. Provides consultancy, system integration, migration and managed services,…
Serves B2B channel partners and their end customers, particularly organisations operating contact centres and customer experience teams across on-premise, cloud or hybrid environments.
Financial Health
HealthyHealthy · Hiring · 16% CAGR over 5y
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Computed from 5 filingsProvides managed IT support and consultancy for businesses, including cloud services, online backup, cyber security, network support, Apple Mac and Microsoft systems support, hosted VoIP telecoms, IT…
Serves SMEs and larger international businesses in Central and Greater London that rely on IT systems, including organisations using Apple Mac and Microsoft environments.
Financial Health
StrongStrong · Growing, Hiring · 6% CAGR over 4y
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Computed from 4 filingsProvides technology consultancy for financial markets institutions, supporting trading, risk and back‑office systems. Services include advisory, project delivery, application support, testing and…
Serves large banks and financial institutions in the financial markets sector, particularly teams responsible for trading applications, risk, back-office operations and investment platforms.
Financial Health
HealthyHealthy · Hiring · 6% CAGR over 3y
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Computed from 5 filingsProvides IT infrastructure consultancy, including architecture design, engineering, integration and support of enterprise IT systems for organisations in financial services, telecommunications and…
Serves enterprise organisations in financial services, telecommunications and secure government sectors, including buyers responsible for IT infrastructure and systems delivery.
Financial Health
WeakWeak · -68% CAGR over 4y
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Computed from 5 filingsProvides consulting and technical services for trading and risk management systems used in energy, commodities, treasury and capital markets. Services include implementation and support of platforms…
Serves enterprise and public-sector organisations in energy, commodities, shipping, treasury, central banking, capital markets and asset/investment management, especially teams using trading and risk…
Financial Health
StrongStrong · Hiring · 27% CAGR over 5y
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Computed from 5 filingsProvides Salesforce consulting services including platform development, configuration, integration, and implementation. Offers managed support, training, and analytics, working with Salesforce…
Serves UK and global businesses and nonprofits using Salesforce, with emphasis on fintech, financial services, healthcare and life sciences, charities, churches and asset management organisations.
Financial Health
WeakWeak
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Computed from 5 filingsProvides managed IT services and consulting, including IT strategy, infrastructure support, helpdesk services, cloud migration, network and security implementation, and device management. Delivers…
Serves SMEs and larger organisations with internal IT needs, especially creative agencies, healthcare providers and education institutions seeking external IT expertise to extend their teams.
Financial Health
HealthyHealthy · -6% CAGR over 4y
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Computed from 3 filingsProvides IT consulting, managed services, and technical support for enterprise infrastructure. Services include cloud and Azure management, cybersecurity and compliance, virtualisation, backup and…
Serves B2B organisations with internal IT teams, including firms needing managed support, cloud and cybersecurity expertise, and IT service providers seeking white-label or overflow support.
Financial Health
WeakWeak · Hiring · 5% CAGR over 2y
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How London IT Integration companies work and how to sell to them
What they do
London IT integrators usually earn revenue from advisory scoping, implementation projects, migration work, licence resale and recurring managed support. A typical engagement starts with discovery or architecture review, then moves into a statement of work priced on fixed-fee milestones, day rates or blended delivery teams. Retainers cover monitoring, incident response, minor change and service management once the new environment is live. The service shape is mostly people-led: architects, integration engineers, project managers and support analysts combine packaged software, cloud infrastructure and bespoke connectors. Gross margin therefore depends on utilisation, contractor mix, change control and the ability to convert one-off work into account-led support.
Who they sell to
Most sell to mid-market and enterprise buyers with fragmented application estates, audit obligations or recent cloud migration commitments. The sponsor is often a CIO, CTO, COO, CISO, finance transformation lead or programme director, with procurement and legal teams joining once scope and risk become clearer. New work is commonly won through referrals, incumbent account expansion, partner channels, public-sector procurement routes or direct bids against a defined statement of work. Sales cycles are rarely pure self-serve; even smaller projects tend to require technical workshops, security review and evidence of delivery method before commercial approval.
What they buy
Most IT integration firms tend to spend where delivery quality, utilisation and assurance affect margin. Useful categories include professional-services automation, CRM, proposal management, resource planning, project accounting, time recording, billing, revenue recognition and customer support tooling. Delivery teams may also buy test automation, monitoring, observability, identity management, security assessment, endpoint management, cloud cost control and documentation systems. People costs make recruitment, contractor management, technical training and HR operations recurring needs, particularly where skills shortages affect project delivery. Firms bidding into larger customers may also need legal support, insurance advice, compliance consultancy, accreditation preparation and marketing that can translate technical delivery into sector-specific proof.
Why and how to sell to them
Commercial intent often appears when an integrator wins a larger customer, opens a new delivery pod, hires senior sales or delivery leadership, adds managed-service capability, or moves from founder-led delivery into account management. Pain points tend to be operational rather than abstract: billable time leaking through poor scoping, project margins hidden until late, security questionnaires slowing bids, and support obligations stretching teams after go-live. Outbound messages usually land better when they connect to delivery governance, utilisation, audit evidence, faster proposal response or cleaner handover from project to support. Generic efficiency claims are less useful than showing how the offer fits a consulting-and-retainer operating model.
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.
Also in London
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Frequently asked questions
How many IT integration companies are there in London?
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