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Endpoint Security Companies in the UK: 400+ Active Firms (2026)
Endpoint security companies in the UK protect workplace devices, servers and mobile endpoints from malware, intrusion and data loss.
Buying centres tend to sit with security operations, IT infrastructure, risk and procurement teams rather than an individual software owner. Sellers usually face B2B and public-sector evaluation cycles, with proof-of-value work around malware prevention, intrusion detection, device hardening, threat monitoring and incident response. Engagements tend to split between product subscriptions, managed monitoring, response retainers and implementation projects that have to fit an existing stack. Typical buyer types are mid-market and enterprise organisations with dispersed device estates, formal compliance workloads and enough internal IT capacity to act on alerts.
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The UK cohort contains 466 actively trading endpoint security companies, making it a specialist slice of the cyber market rather than a general software list. Reported employment across these firms totals 1,825 people, so the footprint looks weighted towards specialist providers rather than labour-intensive services groups. That is consistent with a market where product engineering, threat research, support and channel sales sit alongside managed-service delivery, and where many suppliers sell into existing security stacks rather than replacing every control at once.
Endpoint security sits in the part of cyber where regulation is mostly indirect. Buyers usually care less about a licence to operate and more about auditability, evidence retention, access controls and response processes that help them meet privacy, outsourcing and sector-specific risk obligations. Public-sector customers add procurement controls, security questionnaires and assurance requirements, while enterprise buyers tend to test integration with identity, device-management and logging systems. Market structure therefore favours suppliers that can document control coverage and support incident workflows, not only vendors with prevention technology.
Demand appears tied to buyers needing prevention, monitoring and response across workplace devices without multiplying operational workload. The cohort appears to contain many specialist providers and relatively few larger-revenue operators, so sales motions are likely to stay evidence-led: pilots, assurance reviews and integration checks before broader deployment. Consolidation may come through services-led buyers and platform-adjacent cyber groups, although specialist endpoint teams can remain relevant where device hardening, forensic response or data-loss reduction are hard to fold into generic tooling.
466
Active firms
2026
23
Over £5M revenue
reported turnover threshold
34
Incorporated since 2022
newer registrations
Key facts
About 4% of the trading cohort reports turnover above £5M (23 of 466 firms) — the rest sits below that revenue band.
7% of the cohort was incorporated since 2022 (34 firms), so a sizeable share is in its first few filing cycles.
Endpoint security vendors sit close to everyday business equipment, covering workplace devices, servers and mobile endpoints rather than only perimeter network controls.
Typical buyers include IT teams, managed-service providers, insurers and internal security teams assessing operational risk.
Go-to-market patterns tend to split between service-led security providers and leaner software-oriented firms selling device protection and monitoring.
Top UK endpoint security companies
POINTWIRE LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides cyber security and endpoint management services, including unified endpoint management, managed detection and response, patch management, and security assessments. Implements and supports…
Serves businesses and public-sector organisations needing endpoint security and IT security support, with experience across policing, defence, central government, maritime and finance sectors.
Financial Health
StrongStrong · Growing, Hiring · 50% CAGR over 2y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops cybersecurity software that protects endpoints and virtual desktop environments from credential theft and data leakage. Products prevent keylogging, screen capture, malicious injection, and…
Targets enterprise IT and security teams, DaaS/VDI providers and OEM partners supporting remote and hybrid workforces on Citrix, IGEL, Microsoft AVD or Windows 365, including regulated businesses and…
Financial Health
WeakWeak · -66% CAGR over 4y
Location
Provides endpoint management and cybersecurity software that gives organisations real-time visibility and control over devices. Platform supports asset discovery, vulnerability monitoring, patch…
Sells to enterprise IT and security leaders in security-conscious organisations, including energy, financial services, healthcare, manufacturing, retail and technology firms, plus federal, state and…
Location
HEIMDAL SECURITY UK LIMITED
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsDevelops and provides a unified cybersecurity platform offering endpoint, network and email security, vulnerability and patch management, privileged access management, and threat detection and…
Sells to businesses and public sector organisations needing cybersecurity, including SMBs and enterprises in critical infrastructure, education, engineering, energy, government, healthcare,…
Financial Health
WeakWeak · 0% CAGR over 3y
Location
Sophos
Develops cybersecurity software and provides managed security services. Offers endpoint protection, firewalls, email and cloud security, threat detection and response (XDR/MDR), vulnerability…
Serves businesses, public sector bodies and institutions worldwide, including education, finance and banking, government, healthcare, manufacturing and retail organisations, plus channel partners and…
Location
Develops and supplies cyber security software and services including network firewalls, cloud and SASE security, endpoint and email protection, threat prevention, and extended detection and response…
Serves large enterprises, SMBs, governments and service providers globally, with sector focus on education, finance, healthcare, manufacturing, retail, telecoms, entertainment and federal, state and…
Location
Develops cybersecurity software and services including extended detection and response (XDR), endpoint protection, and threat monitoring tools. Provides managed detection and response, incident…
Serves enterprise security teams, IT leaders and incident-response buyers across sectors, including organisations with on-prem or air-gapped environments, plus resale, managed service and technology…
Location
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsDevelops embedded cybersecurity technology for laptops and other devices, including hardware‑level security modules and a management platform that provides device monitoring, access control,…
Sells to B2B and public-sector security teams, including defence organisations and enterprises with mobile device fleets, sensitive data, asset control, and compliance requirements across regulated…
Financial Health
StrongStrong · Hiring · 15% CAGR over 4y
Location
Fortinet
Develops and supplies cybersecurity software, appliances and cloud services for network, endpoint and cloud protection. Offers next‑generation firewalls, secure networking, SASE platforms, threat…
Sells to businesses, enterprises, public sector organisations and service providers needing cybersecurity across networks, cloud, endpoints and operational technology, including IT, security and…
Location
SENTINEL BIDCO LIMITED
Trajectory
1y · 2025–NowDevelops cybersecurity software that protects endpoints and virtual desktop environments from credential theft and data leakage. Provides tools such as Armored Client to block keylogging, screen…
Serves enterprises, public sector/state agencies, and technology partners using VDI, DaaS, SaaS and hybrid work environments, particularly security and IT teams managing corporate, BYOD and remote…
Financial Health
Insufficient historyInsufficient history
Location
Develops cybersecurity software using hardware‑enforced isolation to enable secure web browsing, virtual desktop infrastructure (VDI), and controlled cross‑domain data transfer, protecting networks…
Serves organisations with high-assurance cybersecurity requirements, including defence, government and enterprise security teams needing secure browsing and cross-domain controls.
Location
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops cybersecurity software that protects critical IT infrastructure from ransomware attacks. Provides tools for ransomware containment, server intrusion protection, and virtual server security,…
Serves B2B and public-sector organisations with critical IT infrastructure, targeting CISOs and cybersecurity teams in education, finance, government, healthcare, legal and manufacturing sectors.
Financial Health
StrongStrong · Hiring · 17% CAGR over 2y
Location
Sophos
Develops and provides cybersecurity software and managed security services, including endpoint protection, firewalls, email and cloud security, threat detection and response, and managed detection…
Serves businesses and public-sector organisations needing cybersecurity, including education, financial services, government, healthcare, manufacturing and retail, plus channel partners, managed…
Location
GBMS Tech Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops and supplies cybersecurity software and services including endpoint and mobile protection, network monitoring, and zero‑trust security systems. Also provides cyber defence consulting,…
Sells to businesses seeking cyber defence and cyber insurance, particularly organisations needing endpoint, server, mobile and network protection against ransomware, malware and AI-driven threats.
Financial Health
WeakWeak
Location
Withsecure
Develops cybersecurity software and services for managed service providers. Offers the Elements Cloud platform for endpoint protection, exposure management, AI‑driven threat detection, monitoring,…
Sells to managed service providers serving business clients, including MSPs with or without their own SOC, and to businesses seeking European-compliant cybersecurity support.
Location
Darktrace
Develops and provides AI-based cybersecurity software that monitors networks, cloud environments, email, identities and endpoints to detect, investigate and autonomously respond to cyber threats such…
Serves B2B and public-sector organizations of all sizes, particularly CISOs, cybersecurity professionals and SOC teams responsible for enterprise cloud, email, network, OT, identity and endpoint…
Location
NetSecurity.IO Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops cybersecurity software and provides services including endpoint threat detection and response, ransomware and data breach forensic investigations, incident response, managed detection and…
Serves enterprises, government agencies, MSSPs, and law enforcement/intelligence teams with endpoint security, incident response, digital forensics, SOC, and cyber risk needs.
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 4y
Location
DTEX SYSTEMS LTD.
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDevelops cybersecurity software for insider risk management and data loss prevention. Platform monitors user activity, applies behavioural analytics, and detects data exfiltration risks across…
Sells to enterprise security, risk and IT teams in regulated sectors, including critical infrastructure, financial services, manufacturing, life sciences, healthcare, government, technology and…
Financial Health
HealthyHealthy · Hiring · 41% CAGR over 2y
Location
Sophos
Provides cybersecurity software and services including endpoint protection, firewall, threat detection and response, email and cloud security, and managed detection and incident response through a…
Serves businesses and public sector organisations needing cybersecurity, including education, finance, government, healthcare, manufacturing and retail. Targets IT and security teams, plus channel…
Location
Threatscape Security Solutions Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides cyber security consulting, implementation and managed security services. Designs, deploys and supports endpoint, network, cloud and identity protection solutions, including Microsoft and…
Serves mid-sized and large organisations across sectors, especially IT and security teams responsible for endpoints, networks, cloud environments and Microsoft 365, with emphasis on clients needing…
Financial Health
HealthyHealthy · Hiring · 23% CAGR over 4y
Location
Ayomide Colonel Ltd
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsProvides cybersecurity services and software including ransomware protection, email encryption, data loss prevention, and endpoint security. Offers endpoint detection and response (EDR/XDR),…
Sells to B2B customers: company IT/security teams and managed service providers supporting end-client organisations, with messaging aimed at firms concerned about ransomware, spam, phishing and data…
Financial Health
StableStable · Hiring · 62% CAGR over 3y
Location
FIELD EFFECT SECURITY LTD
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsProvides cybersecurity software and services including a managed detection and response (MDR) platform that monitors endpoints, networks and cloud systems. Also offers incident response, security…
Serves managed service providers, SMEs, and internal IT/security teams at businesses of varying sizes, including organisations needing cybersecurity support for themselves or their clients.
Financial Health
StrongStrong · Hiring · 24% CAGR over 4y
Location
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops cybersecurity software and services including network firewalls, endpoint protection, detection and response (XDR/MDR), multi‑factor authentication, secure Wi‑Fi, and zero‑trust access.…
Sells to businesses and managed service providers needing cybersecurity, including organizations of varying sizes and expertise levels, channel partners, and IT/security teams managing distributed…
Financial Health
StableStable · 2% CAGR over 2y
Location
MENLO SECURITY LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDevelops cloud-delivered browser security software that isolates web activity and inspects files to prevent phishing, malware, and ransomware. Provides secure enterprise browser, remote access, and…
Sells to businesses and public sector organisations, especially enterprise IT and security teams managing hybrid workforces, BYOD environments and unmanaged devices. Targets security leaders seeking…
Financial Health
HealthyHealthy · 0% CAGR over 1y
Location
Integrity360
Provides cyber security services including managed detection and response, threat monitoring, incident response, penetration testing, vulnerability management, and security operations. Also offers…
Serves organisations in the public sector and regulated industries including banking, fintech, healthcare, education, utilities, manufacturing, professional services and media across Europe.
Financial Health
Insufficient historyInsufficient history
Location
DE SOFTWARE TECHNOLOGIES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops and provides cybersecurity software and services including next‑generation firewalls, cloud and network security, SASE, endpoint and email protection, threat intelligence and XDR platforms,…
Serves corporate enterprises, SMBs, government agencies and service providers globally, targeting IT and security teams across education, financial services, healthcare, manufacturing, retail,…
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
Develops and provides cybersecurity software and managed services, including a unified platform for threat detection and response, vulnerability and exposure management, SIEM, cloud security…
Serves security and IT teams at mid-market and enterprise organisations globally, including finance, logistics, infrastructure and professional services firms with complex cloud, endpoint and hybrid…
Location
Develops cybersecurity software for security configuration management, file integrity monitoring and vulnerability management. Provides tools that detect unauthorised system changes, assess risks,…
Serves B2B security, IT, compliance and operations teams in enterprises and mid-market organisations, including banking, energy and utilities, and industrial firms managing IT and OT environments.
Location
CYBERSEER LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides managed cybersecurity services including managed detection and response, SIEM, endpoint, network and cloud threat monitoring, and incident response. Operates security operations centre…
Sells to enterprise and mid-market businesses, primarily IT and security leaders needing outsourced cyber defence capacity across SIEM, endpoint, network and cloud environments.
Financial Health
StrongStrong · Growing, Hiring · 8% CAGR over 2y
Location
Cyber Centre of Excellence
Trajectory
2y · 2023–NowProvides cybersecurity services for local authorities and public sector organisations, including monitoring and detection, endpoint and mobile device protection, malware and ransomware mitigation,…
Serves UK local authorities and public sector bodies, including councils, councillors and parish/town councils, with packages also aimed at sole traders and small businesses.
Financial Health
Insufficient historyInsufficient history
Location
ESENTIRE UK LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides managed detection and response cybersecurity services including 24/7 security operations centre monitoring, threat hunting, incident response and digital forensics. Develops an AI‑driven…
Serves mid-market businesses and public sector organisations needing managed cybersecurity, including finance, insurance, legal, healthcare, manufacturing, retail, construction, private equity, food…
Financial Health
HealthyHealthy · 0% CAGR over 1y
Location
Novacoast Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides cybersecurity consulting and managed security services, including penetration testing, identity and access management, security engineering, threat hunting, incident response, vulnerability…
Serves B2B and public-sector organisations with cybersecurity teams, especially CISOs and security programme leaders in healthcare, finance, staffing and federal sectors needing specialist support.
Financial Health
StrongStrong · Hiring · 14% CAGR over 3y
Location
ALERT LOGIC UK LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides managed cybersecurity services including continuous threat monitoring, detection and response across cloud, network, endpoint and application environments. Offers managed detection and…
Serves IT and security teams at businesses needing coverage across cloud, hybrid, on-premise, SaaS, web application and API environments, including organisations with compliance requirements such as…
Financial Health
DistressedDistressed · -59% CAGR over 4y
Location
INTEGRITY SCOTLAND LTD
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsProvides IT cyber security products and services including managed and cloud-based security solutions, security operations centre services, penetration testing, consultancy, IT health checks, and…
Serves private- and public-sector organisations in Scotland and across the UK, targeting IT and security decision-makers responsible for cyber risk, compliance and infrastructure support.
Financial Health
WeakWeak · -8% CAGR over 3y
Location
Develops cybersecurity software for file integrity monitoring, security configuration management and vulnerability management, helping organisations detect unauthorised system changes, assess risks,…
Serves B2B security, compliance and IT operations teams in mid-market and enterprise organizations, including banks, energy and utilities firms, and industrial companies managing both IT and OT…
Location
Forcepoint
Develops cybersecurity software focused on data security and loss prevention. Provides platforms for data security posture management (DSPM), data loss prevention (DLP), and data detection and…
Serves enterprise security, IT and compliance teams in financial services, healthcare, manufacturing, retail and the public sector, especially organisations managing sensitive data across cloud apps,…
Location
Atech Support Limited
Trajectory
3y · 2020–NowFinancial sub-scores
Computed from 3 filingsProvides managed cloud and security services focused on Microsoft technologies, including Azure infrastructure management, Microsoft 365 and modern workplace support, security operations centre…
Serves mid-market and enterprise organisations using Microsoft cloud environments, targeting IT, security and operations teams responsible for distributed users, devices and infrastructure.
Financial Health
StrongStrong · Growing, Hiring · 44% CAGR over 2y
Location
Develops cybersecurity software that monitors system files and configurations, detects unauthorized changes, identifies vulnerabilities, and supports compliance management across IT and cloud…
Sells primarily to businesses and some public sector organisations needing cybersecurity and compliance tools, especially IT, security and compliance teams in enterprises with IT and OT environments,…
Location
JUMPCLOUD UK LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops and provides a cloud-based platform for identity, access and device management. Software enables organisations to manage user identities, single sign-on, multi-factor authentication,…
Serves IT teams and leaders at businesses managing mixed Windows, Apple, Linux and Android environments, plus MSPs, value-added resellers, distributors and technology partners supporting client…
Financial Health
StrongStrong
Location
Oyster Technologies Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides cyber security products and services including network and email security, endpoint detection and response, data loss prevention, firewalls, encryption, and access control. Also offers…
Serves B2B and public sector buyers, particularly organisations in financial services, utilities and energy, retail and public services, targeting IT, security and operations teams seeking cyber…
Financial Health
StableStable · Hiring · 19% CAGR over 4y
Location
Cyber Security (N.I.) Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides cyber security consultancy and managed security services including managed detection and response, SIEM monitoring, firewall and endpoint protection, patch management, penetration testing,…
Serves organisations across the UK and Ireland, particularly businesses using Microsoft 365 and Azure, whose IT or security teams need outsourced cyber security monitoring and assessments.
Financial Health
StrongStrong · Hiring · 19% CAGR over 4y
Location
Trajectory
2y · 2022–NowFinancial sub-scores
Computed from 2 filingsProvides Microsoft-focused IT consulting and managed services, including identity and access management, cybersecurity, cloud transformation, and endpoint management. Delivers security operations,…
Serves B2B organisations and institutions using Microsoft environments, including legal, retail, utilities, healthcare, manufacturing, higher education, financial services and professional services…
Financial Health
StrongStrong · Hiring · 96% CAGR over 1y
Location
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops browser-based cybersecurity software that monitors user browser sessions to detect and respond to threats such as phishing, malicious extensions, credential theft, and account takeover,…
Sells to B2B security leaders, CISOs, security operations and IT teams at organisations whose employees use browsers, SaaS and cloud accounts, including companies exposed to phishing, account…
Financial Health
StableStable · Hiring · 143% CAGR over 2y
Location
APPURITY CONNECT LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides IT consultancy and managed services focused on secure endpoint and mobile device management. Designs and implements device builds, security controls, threat validation, compliance services,…
Serves organisations in regulated and high-risk sectors, selling to IT and security leaders responsible for distributed workforces, endpoint estates, compliance and secure modern workplace programmes.
Financial Health
StableStable · 0% CAGR over 4y
Location
TYCHON INSTALLATIONS LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDevelops endpoint management and cybersecurity software providing asset discovery, vulnerability detection, cryptographic inventory, and real‑time monitoring of enterprise devices. Platform supports…
Sells to B2B and public sector buyers needing endpoint security and management, especially U.S. government agencies, defence organisations, the defence industrial base, and large commercial…
Financial Health
DistressedDistressed · 0% CAGR over 3y
Location
THREATAWARE LTD
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDevelops a cybersecurity management platform that integrates with existing IT and security tools to discover devices, monitor asset inventories, validate controls such as EDR and MFA, and automate…
Serves B2B security and IT teams at larger organisations with complex device estates, including legal, finance, energy and retail companies, as well as CISOs responsible for cyber asset protection.
Financial Health
StableStable · Hiring · 53% CAGR over 1y
Location
Opswat
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDevelops cybersecurity software and hardware for protecting IT and operational technology environments. Products include malware scanning, file sanitization, network detection and response, email and…
Sells primarily to B2B and public sector organisations operating critical infrastructure and industrial environments, including IT and OT security teams, enterprises, and partners needing…
Financial Health
StrongStrong · Hiring · 28% CAGR over 3y
Location
VIRTUALARMOUR LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides managed cybersecurity services including 24/7 monitoring and response, EDR/MDR and SIEM/XDR management, vulnerability assessment, and compliance support. Also supplies and deploys network…
Serves businesses and internal IT/security teams that need external cybersecurity operations support across networks, infrastructure, applications, regulatory compliance and security staffing.
Financial Health
StableStable · Hiring · 24% CAGR over 4y
Location
Teknov8 Distribution Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies cybersecurity and data protection platforms to managed service providers, including backup and disaster recovery, endpoint protection, and managed firewall and network security tools.…
Targets MSPs and IT service providers serving business clients, especially teams responsible for client security, uptime, continuity, compliance reporting, renewals and operational delivery.
Financial Health
StableStable · Hiring · 6% CAGR over 4y
Location
SECURE365 LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides managed detection and response (MDR) services for Microsoft 365 environments, including 24/7 security monitoring, threat detection, and incident triage using Microsoft Defender and Sentinel.…
Sells to security-conscious mid-market organisations, particularly Microsoft 365 users, whose IT and security teams need enterprise-grade cyber monitoring without building an in-house SOC.
Financial Health
StrongStrong · Hiring · 11% CAGR over 4y
Location
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How UK endpoint security companies work and how to sell to them
What they do
Endpoint security firms usually earn revenue from annual or multi-year subscriptions for endpoint protection, detection and response, plus managed monitoring, incident-response retainers, onboarding and policy-tuning work. Pricing is typically per device, per user or per server, sometimes with tiers for threat hunting, forensic support, data-loss controls and reporting. Larger customers expect proof-of-value exercises before committing, because the product has to coexist with identity, device-management, logging and service-desk tooling. Smaller specialist providers may combine software IP with analyst time, so gross margin and delivery capacity depend on how much alert triage and response work remains manual.
Who they sell to
They sell mostly to mid-market, enterprise and public-sector organisations with distributed workforces, regulated operations or a history of security audit pressure. The economic buyer is often a CISO, CIO or IT director, with security operations, infrastructure engineering and procurement shaping the evaluation. CFO and risk teams become more visible where the purchase is tied to cyber insurance, audit findings or outsourcing controls. Typical sales cycles are measured in months rather than days: technical validation, false-positive testing, integration checks, legal review and procurement approval. Route to market is mixed, with direct sales for larger accounts, partner-led resale or managed-service routes for smaller estates, and public-sector frameworks where assurance evidence is mandatory.
What they buy
Endpoint security firms tend to spend on cloud infrastructure, telemetry storage, malware analysis environments, secure development tooling, vulnerability management, code review, penetration testing and compliance support. Commercial teams also need CRM, quoting, billing, customer success, partner-management and helpdesk systems, especially where renewals and channel sales matter. Services spend often clusters around technical recruitment, security-cleared contracting, legal review for enterprise terms, cyber insurance, certification support and content marketing aimed at risk-aware buyers. Suppliers with managed monitoring or response retainers may also buy workflow tooling for case management, rota planning, knowledge bases and evidence capture.
Why and how to sell to them
Commercial intent is easiest to spot around scale events: a new sales leader, public-sector tendering, a move upmarket, support headcount growth or a recent incident-response push. With 23 firms above £5M revenue, many remain cost-sensitive and will challenge tools that create extra analyst work. Useful angles tend to be operational rather than generic security claims: shorter evidence packs for enterprise questionnaires, cleaner renewal reporting, fewer hand-offs between sales and delivery, or faster onboarding for new customer estates. Outreach works better when it maps to the firm’s delivery model, distinguishing subscription software providers from service-heavy monitoring and response teams.
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.
Sources
- Cyber Security Sectoral Analysis 2026
- The report estimates 2,603 UK firms are active in providing cyber security products and services.
- Total annual revenue in the UK cyber security sector reached £14.7 billion in the most recent financial year.
- The sector employed approximately 69,600 Full Time Equivalents in cyber security related roles.
- The sectoral survey of 230 firms covered the categories of cyber security products and services offered.
- The report states that further analysis explores AI security and software security providers operating in the UK market.
Related directories
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