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Endpoint Security Companies in London: 100+ Active Firms (2026)
Endpoint security companies protect laptops, servers and mobile devices from malware, intrusion and data loss for organisations across London.
Buying centres usually sit with security operations, infrastructure and risk teams, with finance and procurement brought in once monitoring, incident response or managed-service cover becomes recurring spend. London suppliers tend to sell to mid-market and enterprise buyers rather than consumers, often where regulated operations, distributed workforces and contractor-heavy device estates make internal coverage difficult. Engagements range from advisory assessments and endpoint hardening projects to ongoing monitoring, response retainers and software subscriptions. The better-fit providers usually show measurable UK operations, specialist technical teams and the ability to work with security-sensitive customers that need evidence, escalation processes and account management rather than generic device support.
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London has 117 actively trading endpoint security firms in this cohort, making it a compact but visible cybersecurity sub-sector rather than a broad software category. Reported headcount totals 1,296 people, which points to a labour footprint concentrated in specialist technical, monitoring and response roles. Scale is uneven: 6 firms report turnover above £5M, while 11 were incorporated since 2022, leaving a market with both established service providers and newer commercial entrants.
Device protection work sits close to cyber insurance, privacy governance and outsourced IT, so procurement tends to test more than detection capability. Buyers usually ask about monitoring cover, incident escalation, data-handling controls and audit evidence, especially when suppliers support regulated and security-sensitive sectors from London. Managed service providers also face a market-structure issue: they may be judged both as security advisers and as operational processors of customer telemetry. That role pushes contracts towards clearer responsibilities for containment, forensic access, customer notification and the treatment of logs that may include sensitive employee or client information.
Buyer behaviour appears to favour suppliers that connect endpoint telemetry with identity, cloud and response workflows, rather than treating device protection as a standalone control. Many London firms still look like specialist service businesses rather than scaled software vendors, so differentiation tends to come from analyst expertise, response discipline and sector knowledge. Consolidation may remain a feature where smaller consultancies need broader monitoring cover or access to enterprise procurement channels. The more resilient models are likely to be those that can prove operational reliability without overextending into every adjacent cybersecurity category.
117
Active firms
2026
6
Over £5M
Revenue threshold
11
New since 2022
Recent incorporations
Key facts
About 5% of the trading cohort reports turnover above £5M (6 of 117 firms) — the rest sits below that revenue band.
9% of the cohort was incorporated since 2022 (11 firms), so a sizeable share is in its first few filing cycles.
Endpoint security in London covers device protection across laptops, servers and mobile devices, with buyers often concerned about malware, intrusion and data loss.
Compromised endpoints can give attackers a route into corporate systems, so buying decisions tend to sit close to security operations and IT risk teams.
The London market mixes product, managed-service and project-led models under the same endpoint-security label.
Top London endpoint security companies
GBMS TECH GLOBAL LTD
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsDevelops cybersecurity software and services including Trident Lockdown zero‑trust endpoint, server and mobile protection, network monitoring tools, and post‑quantum cryptography-based network…
Serves organisations seeking cyber defence and cyber insurance, particularly businesses protecting endpoints, servers, mobile devices and networks against malware, ransomware and AI-driven threats.
Financial Health
StableStable
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 and provides cybersecurity software and managed services, including managed detection and response (MDR), SIEM, vulnerability management, attack surface monitoring, cloud security tools, and…
Serves security and IT teams at mid-market and enterprise organisations globally, including finance, logistics, professional services and other businesses with cloud, hybrid and digital environments.
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
SENTRYBAY LIMITED
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
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
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
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
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
Develops IT management and cybersecurity software for enterprises, including service desk and IT service management tools, endpoint management, network access security, and exposure management…
Sells to enterprise IT, security and service management teams, including CIOs, security professionals and service desk leaders, in organisations managing distributed employees, devices and hybrid IT…
Location
Truesec
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides cybersecurity services including managed detection and response, incident response, digital forensics, threat exposure management, and security consulting. Advises on cloud, identity and…
Serves public sector and government bodies, small and medium businesses, and enterprises across industries, including organizations running mission-critical operations, complex IT environments, and…
Financial Health
StrongStrong · Hiring · 23% CAGR over 3y
Location
Trajectory
3y · 2024–NowFinancial sub-scores
Computed from 3 filingsProvides managed detection and response cybersecurity services, including 24/7 security monitoring, threat detection, investigation, and incident response. Develops a security operations platform…
Serves B2B security teams and SOC leaders at organizations of any size across industries, including those operating cloud, email, endpoint, identity, network and SaaS environments.
Financial Health
HealthyHealthy · Hiring · 11% CAGR over 2y
Location
Develops and provides cybersecurity software and managed security services, including threat detection and response (MDR), SIEM, vulnerability management, attack surface and exposure management,…
Serves security and IT teams at global businesses, including finance, banking, logistics, infrastructure and services organizations, requiring enterprise cybersecurity operations support.
Location
6 Degrees (UK) Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides managed cloud and IT infrastructure services including private and hybrid cloud hosting, colocation and connectivity solutions. Delivers cybersecurity services such as penetration testing,…
Serves UK mid-market and enterprise organisations, including public sector bodies, whose IT and security leaders need managed cloud, connectivity, cyber security and modern workplace support.
Financial Health
DistressedDistressed
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
SYNTAXONE LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides managed IT support and outsourcing services for businesses, including infrastructure management, cloud and Microsoft 365 services, Azure consultancy, cybersecurity and compliance support,…
Serves London-based businesses, especially regulated financial services firms, alternative investment managers, UHNW/family offices, renewable energy companies and recruitment/executive search…
Financial Health
StableStable · 0% CAGR over 2y
Location
Cybanetix Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides managed cybersecurity services including security operations centre (SOC) monitoring, managed detection and response, endpoint protection, firewall and email security, cloud security, and…
Serves business customers with IT infrastructure and cybersecurity/compliance needs, particularly organisations migrating from legacy security systems and seeking outsourced or managed security…
Financial Health
HealthyHealthy · Hiring · 44% CAGR over 4y
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
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
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
Bluevoyant
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsProvides managed cybersecurity services including managed detection and response, third‑party risk management, and digital risk protection. Monitors networks, vendors, and online assets for threats,…
Sells to B2B cybersecurity, IT, risk and compliance teams at mid-market and enterprise organisations managing networks, third-party vendors and digital brand exposure, including users of Microsoft,…
Financial Health
HealthyHealthy · Hiring · 20% CAGR over 1y
Location
Moof IT Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides Apple‑focused IT services including macOS device management, Mac integration, Jamf Pro deployment and support, automated patching, and security compliance tools. Delivers managed IT support…
Serves enterprises, SMEs, universities and colleges using Apple devices, including internal IT teams and end users needing Mac management, Jamf Pro support and user support in the UK and abroad.
Financial Health
StableStable · Hiring · 5% CAGR over 4y
Location
ECI
Provides managed IT services including cloud infrastructure management, cloud migration, cybersecurity monitoring, network solutions, and application development. Also delivers data, DevOps, and…
Serves regulated financial services firms, especially alternative investment managers and hedge funds, including organisations managing large AUM across global markets.
Location
Transputec
Provides managed IT services including service desk support, network and infrastructure management, cloud migration and management, cybersecurity operations centres, penetration testing, and DevOps.…
Sells to businesses and public sector organisations needing outsourced IT, cyber security and cloud support, especially CIOs, CISOs and IT teams. Targets UK organisations adopting modern workplace,…
Financial Health
Insufficient historyInsufficient history
Location
Thrive
Provides outsourced IT infrastructure and managed services including cybersecurity monitoring and response, vulnerability management, cloud and disaster recovery services, firewall and endpoint…
Serves mid-market companies and larger organisations with internal IT needs, especially businesses running Microsoft 365/Azure, cloud infrastructure, servers, networks and SaaS applications.
Location
DIGITAL SAMURAI LTD
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsProvides cybersecurity services including risk assessments, penetration testing, vulnerability assessments, incident response, and managed detection and response. Also offers compliance support such…
Serves organisations requiring cybersecurity support, especially in healthcare, finance, retail and logistics, plus governments and institutions needing cybercrime defence and regulatory compliance.
Financial Health
WeakWeak · Hiring · 122% CAGR over 3y
Location
IT SERVICE LONDON LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides managed IT services for small and medium-sized businesses, including IT support, network operations, cybersecurity monitoring, cloud migration and management on Microsoft Azure and Office…
Serves SMEs and mid-sized organisations in London and internationally, including finance, property, not-for-profit and public sector clients, typically business leaders and IT teams needing…
Financial Health
StrongStrong · Hiring · 11% CAGR over 4y
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
NDUO LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides IT consulting and managed services for Apple-based enterprise environments, including mobile device management, user lifecycle management, security and compliance, automation, and…
Sells to Apple-based businesses, particularly growing and enterprise organisations needing device management, security and compliance support. Targets IT and operations teams in sectors including…
Financial Health
HealthyHealthy · Hiring · 17% CAGR over 4y
Location
Threat Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides cybersecurity and managed IT services including continuous penetration testing, red team exercises, managed threat detection and response, vulnerability scanning, cloud and infrastructure…
Serves B2B customers, from fast-moving scale-ups to multinational enterprises, especially organisations with complex IT, cybersecurity and compliance requirements across cloud, endpoint, network and…
Financial Health
WeakWeak
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
Blueraq Networks Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides cloud backup and data protection services for businesses, including backup for Microsoft 365, Google Workspace, Salesforce and other platforms. Also offers endpoint detection and response,…
Serves B2B organisations of all sizes, especially SMEs, schools, financial services, accountants, healthcare and dental practices, marketing agencies, hospitality, property firms, law firms and IT…
Financial Health
HealthyHealthy · Hiring · 29% CAGR over 2y
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
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
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
Integrity360
Provides cyber security services including managed detection and response, threat monitoring, vulnerability management, incident response, penetration testing, and governance, risk and compliance…
Serves organisations across Europe, including public sector bodies and businesses in banking, financial services, fintech, healthcare, education, utilities, manufacturing, professional services and…
Financial Health
Insufficient historyInsufficient history
Location
MBA INFORMATION TECHNOLOGY LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides IT consulting and managed services including cyber security assessments, penetration testing, governance and compliance support, cloud and data centre infrastructure solutions, automation,…
Serves mid-sized UK businesses, particularly IT and security leaders seeking external advice and support across cyber security, automation, data centre, cloud and compliance decisions.
Financial Health
WeakWeak · -71% CAGR over 4y
Location
VG SUPPORT LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides cybersecurity and IT infrastructure services including cyber defence, cloud architecture design, managed IT support, security verification, compliance audits, and disaster recovery planning…
Serves enterprise organisations, including telecoms providers, fintech firms, aerospace businesses, technology companies and professional bodies, targeting buyers responsible for IT infrastructure,…
Financial Health
StrongStrong · Growing, Hiring · 3% CAGR over 4y
Location
Challow
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides managed IT services, technical support, and cybersecurity solutions, including compliance with the UK Cyber Essentials scheme. Offers managed devices and bring‑your‑own‑device support, with…
Serves B2B legal-sector clients, particularly law firms and barristers’ chambers, including partners, solicitors, clerks and self-employed barristers.
Financial Health
HealthyHealthy · Hiring · 9% CAGR over 2y
Location
LANWARE LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides managed IT services and technical support for financial services firms, including cloud infrastructure, Microsoft 365 management, cyber security, networks, virtual desktops, disaster…
Serves B2B financial services firms, especially London-based independent fund managers, hedge funds, asset managers and investment firms, from start-ups to established organisations.
Financial Health
HealthyHealthy · Hiring · 8% CAGR over 4y
Location
MAPLE TECHNOLOGY LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides managed IT services for businesses, including technical support, Microsoft 365 management and cloud migration, cybersecurity, backup and disaster recovery, IT governance, procurement, and…
Serves financial-services SMEs and other businesses, mainly in Central London, including hedge funds, investment managers and insurance firms, with users and teams across the UK, US and Asia.
Financial Health
StrongStrong · Hiring · 11% CAGR over 4y
Location
LODO LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides managed IT services including user support, 24/7 remote monitoring, end‑user training, and technical support for business systems. Offers cybersecurity, network and endpoint security, cloud…
Serves 10-300+ user businesses and nonprofits, including professional services, healthcare, legal, retail and manufacturing organizations.
Financial Health
StrongStrong
Location
Celon Group Limited
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsProvides IT consulting and managed technology services including digital transformation, data analytics, digital asset management, and IT infrastructure modernisation. Delivers cybersecurity services…
Serves businesses and organisations needing support with IT modernisation, cybersecurity, managed services and data analytics, across various industries and typically engaging technology…
Financial Health
StrongStrong · Growing, Hiring · 53% CAGR over 5y
Location
Vambrace
Provides cybersecurity consulting and managed security services, including compliance support for standards such as ISO 27001, Cyber Essentials and PCI DSS, penetration testing, vulnerability…
Sells to businesses seeking cybersecurity, compliance and risk management support, including teams responsible for security operations, compliance and supplier risk. Serves organisations needing…
Location
Alltime Technologies
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides cybersecurity consulting and managed security services, including cyber risk and posture assessments, vulnerability management, ISO 27001 and Cyber Essentials certification support,…
Serves B2B organisations needing cyber security, risk and compliance support, including regulated businesses, healthcare providers, supply-chain partners and Microsoft 365-based teams.
Financial Health
StrongStrong · Hiring · 22% CAGR over 2y
Location
Alltime Technologies
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides cybersecurity consulting and managed security services, including risk and posture assessments, vulnerability management, Microsoft 365 security, employee awareness training, and support for…
Serves UK businesses and organisations, especially regulated sectors, healthcare providers, supply-chain participants and Microsoft 365 users needing cybersecurity governance, assurance and…
Financial Health
StableStable · 0% CAGR over 2y
Location
Ten Levels Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides managed IT services including technical support, cybersecurity monitoring, network and Wi‑Fi setup, cloud and device management, and IT strategy planning, along with business internet…
Serves ambitious, creative and experience-driven businesses, particularly fashion, beauty, ecommerce, retail and hospitality brands, including growing teams looking for an outsourced IT partner.
Financial Health
StableStable · 0% CAGR over 4y
Location
HARMONIC SECURITY LIMITED
Trajectory
1y · 2024–NowProvides an AI governance and security platform that monitors employee use of AI tools across browsers, desktops, and agents, detects sensitive data in prompts or uploads, and enforces usage policies…
Serves B2B security, IT, compliance and business leaders at organizations adopting AI, with emphasis on technology, legal, insurance and healthcare sectors managing employee AI use.
Financial Health
Insufficient historyInsufficient history
Location
New Net Technologies Ltd
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsDevelops IT security and compliance software, including Change Tracker, used to monitor, audit and report configuration changes in databases, operating systems and enterprise applications…
Financial Health
HealthyHealthy · Hiring · 9% CAGR over 5y
Location
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How London endpoint security companies work and how to sell to them
What they do
Revenue usually comes from a mix of licence fees, subscription pricing and service retainers. Software-led firms tend to charge by endpoint, user, server or protected environment, while service-led firms price around monitoring cover, incident response access and onboarding work. Project revenue often starts with device discovery, hardening, policy design or breach-readiness assessment, then converts into recurring monitoring where the buyer wants external capacity. The product shape is part agent, part management console, part analyst workflow; the commercial model depends on how much human response is bundled with the technology.
Who they sell to
Buyers are usually CISOs, Heads of IT, security operations managers, infrastructure leaders and risk owners, with finance and procurement joining once the service becomes a recurring control. Most London endpoint security firms sell direct to mid-market and enterprise organisations, particularly those with regulated operations, dispersed staff or contractor-heavy device estates. Sales cycles tend to involve technical evaluation, security questionnaires and a pilot or assessment before a wider roll-out. Larger buyers may use RFPs or procurement frameworks, while smaller customers are more likely to buy through a consultative direct-sales process.
What they buy
Most endpoint security firms tend to spend on cloud hosting, telemetry storage, log management, case management, ticketing, usage analytics, billing and customer support systems. They also buy security testing, identity tooling, internal device management, compliance support, insurance, legal review and accounting services. Service-heavy providers need recruitment support for analysts, incident responders and customer-facing technical staff, as hiring directly affects delivery capacity. Firms with recurring contracts also need finance and revenue operations tools that handle renewals, usage-based pricing, multi-entity billing and customer evidence packs without adding manual work to technical teams.
Why and how to sell to them
Buying triggers often appear when endpoint security firms win larger customers, move from project work into recurring monitoring, add analyst headcount or face tougher procurement checks from security-sensitive buyers. Common pain points include alert volume, customer onboarding, evidence collection, margin pressure and the need to prove response processes during audits or renewal discussions. Outbound messaging is usually better anchored in operational friction than fear-led cyber claims. Sellers tend to get further by showing how they reduce analyst workload, shorten procurement cycles, improve renewal evidence or help service teams deliver consistent response cover.
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.
Also in London
Related directories
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