IT Resellers Companies in the UK: 1,778 Active Firms (2026)
IT resellers in the UK source, configure and support business hardware, software licensing and managed technology supply chains.
Buying centres usually sit in IT procurement, finance-controlled software licensing, infrastructure operations and security teams. Customers range from owner-managed businesses needing device supply and helpdesk support to mid-market, public-sector and education buyers using resellers for framework purchasing, configuration, rollout and account management. Typical engagements are not pure retail transactions: they often combine hardware fulfilment, licence renewal, installation, warranty handling and managed support. The more service-led operators use cloud migration, cybersecurity implementation and lifecycle asset management to protect margin when device supply is price-contested.
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The UK has 1,778 actively trading IT reseller companies. Reported employment totals 3,123 people; among firms with employment disclosure, 124 of 124 report headcount, giving a 100% reporting rate. The market reads as an account-led supply base, not just a long tail of device traders: the firms with visible headcount need sales, procurement, configuration, support and renewal capability. Smaller operators still matter where customers value vendor access, credit terms and local implementation capacity over a single national fulfilment route.
Contract structure matters more than sector authorisation for most UK IT resellers. Public-sector and education work tends to bring formal procurement, audit trails and service-level commitments, while commercial accounts focus on price protection, licence compliance, delivery assurance and support response. Resellers also inherit obligations from upstream licence owners and hardware manufacturers, including renewal terms, usage rules, returns handling and asset disposal. Cybersecurity implementation adds another layer, because customers expect controls, documentation and incident pathways even where the reseller is not itself a regulated technology provider.
Margin pressure appears likely to keep pushing the sector away from transactional fulfilment and towards managed support, cloud migration, security implementation and lifecycle services. Scale-up scarcity tends to matter less here than relationship depth and vendor access: buyers often want continuity, credit terms and a supplier that can handle messy estates. Consolidation has been a recurring pattern where procurement scale, renewal administration and accreditations matter, but regional specialists can remain relevant through customer familiarity and implementation work. The risk is that resale margin becomes the visible line item while service quality carries the real switching cost.
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
Active director count is the full Companies House board, so it can be higher than the number of names listed — we leave out nominee and formation-agent directors, who aren’t worth contacting. It’s blank for the small number of companies whose officers we haven’t fetched yet.
You’re charged per business, not per row. Where a business trades through several registered companies you get every one, and the Group Primary column marks one row per business — filter to those and the count matches your invoice. Rows sharing a website are not automatically one business: franchises and multi-site operators each count separately, and where names don’t prove a relationship we count them apart rather than guess.
1,778
Active firms
2026
149
Over £5M revenue
Annual revenue threshold
94
Incorporated since 2022
Recent entrants
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Key facts
About 8% of the trading cohort reports turnover above £5M (149 of 1,778 firms) — the rest sits below that revenue band.
5% of the cohort was incorporated since 2022 (94 firms), so a sizeable share is in its first few filing cycles.
IT resellers act as a single procurement route for business buyers that need hardware sourcing, software licensing and support without managing several supplier relationships.
Value-added reseller work often includes configuration, licence administration and supplier liaison rather than pass-through distribution alone.
Buyer demand tends to come from organisations with mixed device estates, recurring licence renewals and limited in-house procurement capacity.
Margins can depend on supplier terms, renewal timing and services attached to the sale, making the model different from pure consultancy or managed services.
Top UK IT Resellers companies
Financial sub-scores
Computed from 4 filingsSupplies IT hardware as a value‑added reseller, selling equipment via an online shop and procurement frameworks. Provides IT consultancy, installation, support and maintenance, networking and…
Serves UK businesses and public sector organisations, including NHS bodies, healthcare providers, schools, education centres, and local or national government agencies buying IT hardware and support…
Financial Health
DistressedDistressed · -78% CAGR over 3y
Location
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Financial sub-scores
Computed from 5 filingsSupplies IT and telecommunications products and services, including hardware, software licensing, mobile solutions, managed print, cloud services, audio‑visual systems, and hardware warranty and…
Serves UK-wide corporate clients, government bodies, NHS organisations and education providers, from start-ups to established businesses, with buyers responsible for IT and procurement.
Financial Health
HealthyHealthy · -65% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides IT infrastructure products and services as a value‑added reseller, including hardware and software procurement, installation, managed support, cloud hosting, networking, security services,…
Serves businesses across multiple sectors, especially organisations with UK and global footprints and internal IT teams needing vendor-agnostic ICT supply and support partners.
Financial Health
StableStable · -7% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides IT infrastructure products and services including networking equipment, firewalls, storage and virtualisation systems. Supplies hardware and software, procurement and deployment, along with…
Serves SMEs through global enterprises across the UK and Ireland, targeting businesses needing IT infrastructure, support, hardware, software, networking, storage, virtualisation and security…
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
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Computed from 5 filingsProvides enterprise IT services and technology solutions, including cloud and data centre infrastructure, networking, cybersecurity, software licensing, virtual desktop systems, IT asset management…
Serves businesses and enterprise organisations, particularly IT leaders and procurement teams needing end-user, data-centre and cloud technology, software licensing, cybersecurity and infrastructure…
Financial Health
StableStable · 0% CAGR over 4y
Location
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Financial sub-scores
Computed from 4 filingsSupplies and supports Apple and Microsoft based IT solutions including hardware, software, cloud, cybersecurity and device management. Provides managed and professional IT services, lifecycle…
Serves educational institutions, public sector organisations, charities, creative and media organisations, and businesses buying Apple, Microsoft and wider IT services.
Financial Health
HealthyHealthy · -76% CAGR over 3y
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- Millgate08222474
Financial sub-scores
Computed from 4 filingsProvides IT and telecommunications products and services including hardware procurement, cloud and infrastructure solutions, cybersecurity, software licensing, and managed IT support. Also supplies…
Serves UK businesses, from growing SMBs to established enterprises, that need outsourced IT, telecoms, cybersecurity, cloud, software licensing and managed service support.
Financial Health
StrongStrong · Profitable · -6% CAGR over 3y
Location
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Computed from 5 filingsProvides IT solutions and services including workplace technology lifecycle management, IT procurement, audiovisual systems, data centre and networking infrastructure, cybersecurity, managed print,…
Sells to B2B organisations, particularly IT, operations and procurement teams managing workplace technology estates across single or multiple UK sites and offices in Europe.
Financial Health
StableStable · -72% CAGR over 4y
Location
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Computed from 5 filingsProvides IT infrastructure products and services including network and cloud solutions, cybersecurity systems, digital workplace technologies, and data and AI platforms. Offers consultancy, project…
Serves corporate and public sector organisations, including finance, legal, insurance and professional services firms, plus healthcare and local government bodies seeking enterprise IT support.
Financial Health
StableStable
Location
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Computed from 5 filingsProvides IT services including managed support, service desk, consultancy and infrastructure deployment. Supplies and configures hardware and software, and delivers cloud, cybersecurity, network,…
Serves enterprise, mid-sized and small business organisations, plus public sector bodies, targeting IT teams and technology decision-makers seeking an IT technology partner.
Financial Health
HealthyHealthy · Hiring · 8% CAGR over 4y
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Computed from 5 filingsProvides IT procurement and supply services, sourcing hardware including networking equipment, storage systems and RF amplifiers. Offers licensing advice, infrastructure deployment, data security and…
Serves UK public sector and enterprise buyers, including central government, local councils, healthcare, transportation, security and defence organisations, plus businesses with IT infrastructure…
Financial Health
StrongStrong · Hiring · 11% CAGR over 4y
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Computed from 5 filingsSupplies IT hardware and infrastructure to businesses and public sector organisations, including servers, storage, client devices and networking equipment. Provides cybersecurity services, cloud…
Serves IT departments and technical buyers in businesses and public sector organisations, including software, research, marketing data, manufacturing and utilities firms.
Financial Health
StableStable · -4% CAGR over 4y
Location
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Computed from 4 filingsProvides IT services and technology supply to organisations, including cybersecurity, cloud computing, hybrid infrastructure, modern workplace solutions and device‑as‑a‑service. Also offers…
Serves B2B organisations, particularly education providers such as schools, academies and colleges, alongside corporate groups seeking external technology partners.
Financial Health
HealthyHealthy · Hiring · 10% CAGR over 3y
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Computed from 3 filingsSupplies IT hardware and software from major vendors and provides technology procurement services. Also offers managed cloud services, cybersecurity solutions, communications systems, warranties, and…
Sells to businesses and organisations needing IT procurement and managed technology support, including IT managers and teams. Serves sectors such as education and manufacturing, plus organisations…
Financial Health
StrongStrong · Growing, Hiring · 29% CAGR over 2y
Location
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Computed from 5 filingsOperates as a holding company coordinating group activities. Through its subsidiaries, provides IT equipment distribution, device build and configuration, logistics, IT infrastructure and consultancy…
Serves enterprise organisations, digital service providers, and public-sector or regulated buyers in education, healthcare and defence, including teams responsible for IT infrastructure and cyber…
Financial Health
StableStable · -68% CAGR over 4y
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Financial sub-scores
Computed from 3 filingsProvides IT infrastructure and support services including data storage, network connectivity, data centre compute, backup and recovery, and cloud services. Also offers cybersecurity solutions,…
Serves UK enterprises and growing businesses with in-house IT, infrastructure, security and operations teams needing data centre, cloud, cybersecurity, procurement and global IT supply support.
Financial Health
StableStable
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Computed from 4 filingsProvides IT infrastructure and managed technology services, including cloud solutions, networking and Wi‑Fi, data centre systems, cybersecurity, and workplace collaboration tools. Also offers…
Serves businesses and organisations of all sizes across industries in the UK, targeting IT, operations and procurement decision-makers responsible for workplace technology, infrastructure, cloud,…
Financial Health
HealthyHealthy · Hiring · 44% CAGR over 3y
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Computed from 5 filingsProvides enterprise IT hardware services including data centre optimisation, multi‑vendor hardware support, device procurement, configuration and deployment, and asset disposal. Also offers cloud…
Serves large enterprise organisations and global IT teams managing data centres, office IT estates and end-user device fleets, particularly businesses focused on cloud migration, hardware cost…
Financial Health
HealthyHealthy · Hiring · 26% CAGR over 4y
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Computed from 5 filingsProvides IT consultancy, managed services and hardware supply, including HPE servers, storage and Aruba networking. Sells PCs, laptops and refurbished devices, and delivers cloud, remote access and…
Serves schools, colleges and other education providers, alongside businesses and legal services firms needing IT infrastructure, devices and managed support across the UK.
Financial Health
StrongStrong · Growing, Hiring · 14% CAGR over 4y
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Computed from 5 filingsProvides IT products and services including supply of hardware and software, network design and implementation, enterprise storage systems, managed print services, hardware repair and maintenance, IT…
Sells to businesses and organisations with in-house IT estates, targeting IT managers, operations teams and procurement buyers needing infrastructure, networking, print, storage, support, engineering…
Financial Health
HealthyHealthy · 0% CAGR over 4y
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Computed from 5 filingsProvides IT infrastructure and managed technology services, including datacentre design and build, cloud migration, business connectivity, network infrastructure, unified communications, remote…
Sells to businesses needing IT infrastructure and support, including organisations with datacentre, cloud, networking, communications and cybersecurity requirements. Targets business IT buyers…
Financial Health
DistressedDistressed · -11% CAGR over 4y
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Computed from 5 filingsProvides IT consultancy and infrastructure services including enterprise networking, cloud and data centre solutions, and cybersecurity. Supplies and deploys hardware such as servers, storage,…
Serves UK organisations and IT teams needing enterprise infrastructure, networking, cybersecurity, cloud and hardware procurement support, including businesses managing data centres, endpoints and…
Financial Health
StrongStrong · Hiring · 29% CAGR over 4y
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Computed from 5 filingsProvides managed IT services including cloud infrastructure, cybersecurity, networking, datacentre and workspace solutions. Delivers IT support, lifecycle management, telecommunications and…
Serves UK businesses across multiple industries, targeting organisations needing outsourced IT support and account-managed technology procurement, including teams responsible for security, cloud,…
Financial Health
StrongStrong · Growing, Hiring · 36% CAGR over 4y
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Computed from 3 filingsProvides IT services including network infrastructure, cybersecurity, and hybrid‑cloud solutions. Offers technology advisory, system integration, managed IT services, lifecycle and asset management,…
Serves enterprises and mid-market organisations needing IT infrastructure support, particularly technology leaders responsible for networks, cybersecurity, hybrid cloud, managed services and digital…
Financial Health
StableStable · -1% CAGR over 2y
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Computed from 3 filingsProvides IT infrastructure products and services including cloud, cybersecurity, networking, data centre and collaboration solutions. Offers system integration, logistics, managed services, asset…
Serves enterprise and public-sector IT buyers across financial services, biotech and life sciences, retail, healthcare, technology providers, manufacturing, education and federal organisations.
Financial Health
WeakWeak · 0% CAGR over 2y
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Computed from 3 filingsProvides business IT solutions including hardware and software procurement, IT support, cybersecurity, backup, storage and virtualisation. Also delivers audio‑visual systems, printers and…
Serves businesses and organisations of all sizes, including schools, that need IT procurement, infrastructure, support, connectivity and related technology services.
Financial Health
HealthyHealthy · Profitable · 1% CAGR over 2y
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Computed from 3 filingsProvides IT infrastructure solutions including servers, storage systems and network infrastructure. Delivers data centre design, deployment and management, hyper‑converged and software‑defined…
Sells to B2B organisations with in-house IT infrastructure needs, including businesses managing data centres, enterprise networks, hybrid cloud environments and distributed workforces.
Financial Health
StrongStrong · Growing, Hiring · 96% CAGR over 2y
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Computed from 5 filingsSupplies IT hardware and software and provides IT support services to corporate, public sector, education, and healthcare organisations. Offers system installation, managed IT services, technical…
Serves private and public sector organisations in Wales and South West England, including corporate clients, public bodies, education providers and healthcare organisations.
Financial Health
HealthyHealthy · -3% CAGR over 4y
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Computed from 5 filingsProvides outsourced IT support and managed services for businesses, including cyber security, cloud and networking management, Microsoft services, project delivery, device lifecycle management, IT…
Serves businesses and organisations, particularly in the Leeds area, that need an outsourced IT partner, including teams responsible for infrastructure, cloud, security, licensing and technology…
Financial Health
StableStable · -69% CAGR over 4y
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Computed from 4 filingsProvides IT infrastructure and technology services including hybrid cloud and datacentre solutions, cybersecurity, networking, managed IT services, hardware and software supply, and professional…
Serves businesses and organisations with internal IT, operations and leadership teams responsible for cloud infrastructure, cybersecurity, networking, Microsoft environments, workplace technology,…
Financial Health
StrongStrong · 53% CAGR over 2y
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Computed from 5 filingsProvides IT consulting and integration services, delivering tailored cloud, on‑premise and hybrid infrastructure, cybersecurity, connectivity, data protection, audio‑visual collaboration, SD‑WAN,…
Serves B2B organisations of all sizes, including ICT and business technology teams seeking tailored IT partnerships across cloud, on-premises and hybrid environments.
Financial Health
StrongStrong · Growing, Hiring · 35% CAGR over 5y
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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 IT infrastructure and networking services, including IT consultancy, Wi‑Fi design and surveys, cyber certification support, hardware and software procurement, bespoke system builds,…
Serves businesses of all sizes and public sector organisations needing IT infrastructure, networking, hardware procurement and consultancy support, including organisations upgrading or building…
Financial Health
StrongStrong · Growing, Hiring · 43% CAGR over 4y
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Computed from 3 filingsProvides managed IT services and IT infrastructure solutions, including data storage, enterprise compute, virtualisation and data management. Sources and deploys hardware and software such as Cisco…
Serves businesses across industries, particularly IT teams and organisations needing managed IT, enterprise infrastructure, data storage, virtualisation and remote-working support.
Financial Health
HealthyHealthy · 29% CAGR over 1y
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Computed from 3 filingsProvides IT consulting, integration and managed services, delivering cloud platforms, modern infrastructure, cybersecurity, connectivity and digital workspace solutions. Also offers endpoint…
Serves UK organisations with complex IT environments, including technology and operations leaders responsible for infrastructure, cloud, cybersecurity, digital workspace, edge communications and AI…
Financial Health
StableStable · Hiring · 15% CAGR over 2y
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Computed from 4 filingsSupplies IT hardware and peripherals including laptops, desktops, printers and mobile devices, and resells business software and licences such as Microsoft 365 and Adobe. Also provides cloud, network…
Sells to businesses needing IT procurement and infrastructure support, including teams buying hardware, software licensing, cloud, network and enterprise IT systems for employees and business…
Financial Health
StableStable · -79% CAGR over 3y
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Computed from 5 filingsProvides managed IT support, cyber security services, hosted VoIP telephony, cloud solutions including Microsoft 365 and Azure, internet connectivity, mobile services, data cabling installation, and…
Targets UK businesses and public sector bodies, with sector focus on legal firms, hospitality operators, estate agents and local councils.
Financial Health
StableStable · Hiring · 6% CAGR over 4y
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Computed from 3 filingsProvides IT infrastructure and managed services including design, deployment and management of enterprise servers and storage. Offers cloud hosting, backup and disaster recovery, remote monitoring,…
Serves UK businesses and public sector organisations with business-critical IT estates, particularly in financial services, manufacturing, distribution and retail, as well as teams managing…
Financial Health
StrongStrong · Profitable, Growing, Hiring · 15% CAGR over 2y
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Computed from 2 filingsProvides IT infrastructure and cloud services including hybrid cloud design and deployment, data centre consolidation, containerised data centres, cybersecurity, managed IT support, and multi‑vendor…
Serves UK commercial and public sector organisations, particularly IT leaders and in-house IT teams seeking hybrid cloud, data centre, cybersecurity and managed IT support.
Financial Health
HealthyHealthy · Profitable, Hiring · 20% CAGR over 1y
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Computed from 5 filingsProvides managed IT services including infrastructure management, cloud and virtualisation, service desk support, endpoint security, disaster recovery, data protection, print management, hardware…
Serves organisations of all sizes across the UK, spanning public and private sectors including local authorities, police, central government, healthcare, education, retail, manufacturing, housing…
Financial Health
StableStable · 0% CAGR over 4y
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Computed from 5 filingsSupplies IT hardware and software as a reseller and provides managed IT services and end‑to‑end technology solutions for businesses. Also develops tools such as a sustainability dashboard to monitor…
Serves UK businesses and organisations, particularly IT and procurement teams seeking technology suppliers with sustainability reporting and device estate management needs.
Financial Health
StrongStrong · Growing, Hiring · 15% CAGR over 4y
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Computed from 4 filingsProvides IT system integration and resale services, supplying networking equipment, security and surveillance systems, digital signage, backup and virtualisation solutions. Also delivers software…
Serves B2B and public sector customers, from small to large enterprises and government organisations, needing IT sourcing, software licensing, infrastructure, networking, security, backup and managed…
Financial Health
DistressedDistressed · -21% CAGR over 3y
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Computed from 3 filingsSupplies IT hardware and related services to businesses, including storage systems, cybersecurity solutions, structured cabling, asset tagging and deployment. Acts as an IT reseller providing…
Serves B2B customers and IT teams, including education groups, automotive retail groups, furniture manufacturers and other organisations requiring IT hardware, infrastructure and cyber security…
Financial Health
HealthyHealthy · -9% CAGR over 2y
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Computed from 2 filingsSupplies IT hardware and infrastructure, cloud solutions, and managed IT services. Provides installations, migrations, audits and ongoing technical support, and assists organisations with data…
Serves B2B technology and procurement teams, IT leaders and organisational decision-makers seeking a long-term technology partner, including members of The Curious Mindset community.
Financial Health
StrongStrong · Growing · 0% CAGR over 1y
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Computed from 5 filingsProvides IT services including cloud computing, cyber security, networking and infrastructure, unified communications, audio visual systems, software licensing, AI solutions, and outsourced or…
Serves businesses, education providers and other organisations, targeting IT leaders, operations teams and procurement buyers seeking an external technology fulfilment partner.
Financial Health
StrongStrong · Growing, Hiring · 33% CAGR over 4y
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Computed from 3 filingsProvides IT services for schools and colleges, including managed IT support, network and connectivity setup, device management, cybersecurity, technical support, and digital strategy. Also delivers…
Serves schools and colleges, including education leaders, IT managers, teaching staff and parents involved in 1:1 device schemes and technology purchasing decisions.
Financial Health
StableStable · 4% CAGR over 2y
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Computed from 3 filingsProvides IT services and solutions including infrastructure design, hyperconverged systems, cloud hosting, security and backup, hardware maintenance, software support and remote monitoring. Also…
Serves SMEs, corporate organisations and education providers across industries, typically IT decision-makers needing independent technology services and supplier support.
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StableStable · 0% CAGR over 2y
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Computed from 4 filingsProvides managed IT and cloud services focused on Microsoft technologies, including Azure cloud migration and management, Microsoft 365 support, security and compliance services, licensing advice,…
Serves IT teams and technology leaders in UK businesses and public sector organisations seeking Microsoft Azure, Microsoft 365, security, licensing and managed IT support.
Financial Health
DistressedDistressed · -14% CAGR over 3y
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Computed from 5 filingsProvides configuration, assembly and testing of servers, storage systems and networking equipment, plus global IT logistics and supply of network accessories. Delivers integrated infrastructure…
Targets B2B infrastructure and procurement teams at capital markets/HFT firms, AI/ML organisations and enterprises with global data-centre estates requiring worldwide delivery and support.
Financial Health
StrongStrong · Hiring · 32% CAGR over 4y
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Computed from 2 filingsProcures and resells new, refurbished and end‑of‑life network, telecoms and IT hardware from multiple vendors. Provides asset recovery, equipment auditing, staging and configuration, de‑installation…
Serves businesses and IT infrastructure teams needing network, telecoms and data centre hardware, including organisations with redundant equipment, legacy systems, or decommissioning requirements.
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HealthyHealthy · Profitable · 0% CAGR over 1y
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How UK IT Resellers companies work and how to sell to them
What they do
IT resellers earn revenue from resale margin on devices, networking equipment, licences and infrastructure, with extra income from rebates, support retainers, installation fees and project work. Hardware supply is often low-margin and operationally fiddly, so many firms package procurement with configuration, deployment, warranty administration and asset disposal. Licence work tends to be annuity-like where renewals are managed well, although the reseller still has to prove value beyond order processing. Service-led operators usually attach helpdesk support, cloud migration, security configuration or lifecycle management, turning a purchase relationship into an account-managed contract rather than a one-off fulfilment job.
Who they sell to
Buyers are usually IT managers, heads of infrastructure, finance directors, procurement teams and, in smaller businesses, owner-managers who want one accountable supplier for technology purchasing. Commercial customers often buy through direct account managers, while public-sector and education customers tend to use formal procurement channels, framework routes and documented service commitments. Sales cycles are short for repeat device orders or licence renewals, but become longer when estate refreshes, implementation work, security assurance or budget approval are involved. Typical contract values vary widely: some accounts are basket-sized and transactional, while larger customers expect credit terms, renewal calendars, rollout planning and named support contacts.
What they buy
Most IT resellers tend to spend on systems that protect margin, reduce renewal leakage and make account management less manual. Common categories include CRM, quoting and configuration tools, billing, renewals management, procurement, inventory control, warehouse operations, service-desk software and customer portals. Firms with managed services activity also buy monitoring, endpoint security, identity management, backup, ticketing, documentation and analytics tooling. Outside software, they use accountancy, credit control, legal support for customer terms, recruitment for sales and technical roles, marketing for demand generation, and logistics providers for delivery, returns and asset handling. Cashflow-sensitive operators may also need finance, insurance and credit-risk services.
Why and how to sell to them
IT reseller buyers tend to evaluate suppliers when margin pressure, vendor rebate changes, customer renewals or service-desk load expose operational gaps. A move into managed support, cloud migration or cybersecurity work can trigger spending on ticketing, documentation, compliance processes and technical hiring. Public-sector wins usually sharpen the need for audit trails, service reporting and procurement discipline; commercial growth puts pressure on quoting speed, licence tracking and credit control. Outbound angles work better when tied to leakage, utilisation, renewal timing or fulfilment errors rather than generic efficiency claims. Recent hiring in procurement, account management or support is often a useful signal of commercial intent.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
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Frequently asked questions
How many IT resellers companies are there in the UK?
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