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SecOps Companies in London: 100+ Active Firms (2026)
Security operations companies in London monitor, detect and respond to cyber threats for organisations across the capital.
Budgets usually sit with CISOs, heads of infrastructure, risk teams and, in smaller buyers, finance directors who have inherited cyber accountability. The buying centre is mostly B2B, with mid-market firms looking for outsourced alert triage, retained incident coordination and operational evidence rather than broad IT advice. Engagements tend to be recurring service contracts, with onboarding around log sources, escalation rules, service levels and reporting cadence. London buyers are likely to include regulated financial, professional-services and digital businesses, so procurement often tests response process, assurance documentation and the provider’s ability to work alongside internal IT teams.
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London has 171 actively trading SecOps companies in this list, giving the capital a sizeable specialist base without implying that every cyber consultancy qualifies as operational security. Reported employment totals 1,074 roles across the cohort, with 85 firms reporting headcount. That footprint points to a market made up mainly of specialist service providers rather than very large employers. The commercial centre of gravity appears to be mid-market delivery: enough staff to cover monitoring, triage and response coordination, but usually not the scale associated with broad outsourced IT operations.
Security operations providers sit between outsourced IT, cyber consultancy and incident response, so regulatory exposure depends heavily on the client base and the services performed. Where monitoring touches personal data, GDPR and ICO expectations shape log retention, access controls, breach handling and evidence transfer. Financial-services clients may also bring FCA operational-resilience requirements into procurement, particularly around incident escalation, supplier oversight and continuity planning. Contracting tends to be more formal than in general IT support, because buyers need clarity on responsibilities during live incidents, access to sensitive systems and the boundary between monitoring advice and accountable operational action.
Demand appears tied less to novelty than to operational credibility. Buyers tend to ask whether providers can reduce alert noise, maintain response discipline and document decisions under pressure. The cohort looks likely to keep favouring specialists with repeatable service processes, sector-specific assurance and credible handover into internal teams. Scale-up scarcity may persist, as building an analyst bench, incident playbooks and customer trust takes time. Consolidation remains plausible where providers need broader coverage across cloud controls, security operations and response, though many firms may continue as focused service businesses rather than platform-led vendors.
171
Active firms
2026
29
Above £5M
reported revenue
16
Incorporated since 2022
Key facts
About 16% of the trading cohort reports turnover above £5M (29 of 171 firms) — the rest sits below that revenue band.
9% of the cohort was incorporated since 2022 (16 firms), so a sizeable share is in its first few filing cycles.
Security operations companies sit between in-house security teams and outsourced incident-response capacity.
Day-to-day work typically covers alert triage, threat monitoring and containment.
Buyers often need to read staffing, revenue and operating model separately, rather than treating headcount as a direct proxy for capability.
Top London SecOps companies
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
CyberOne Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsProvides managed cyber security services including 24/7 threat monitoring, managed detection and response (MXDR), incident response, penetration testing, cloud and Microsoft security consulting, and…
Serves growth-focused B2B organisations using Microsoft security, especially in finance, banking and insurance, professional services, healthcare and life sciences, technology, retail, and…
Financial Health
WeakWeak
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
ZEPKO LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides managed cyber security services through a security operations centre, including continuous threat monitoring, incident response, penetration testing, breach assessment, and security…
Serves B2B organisations needing managed security operations, from local mid-market businesses to global enterprises, including firms seeking compliance, ecommerce protection, remote-working security…
Financial Health
StableStable · Hiring · 30% 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
OBRELA SECURITY INDUSTRIES LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides managed detection and response cybersecurity services, cyber risk and compliance management, and digital forensics and incident response. Operates the Swordfish platform to monitor threats,…
Serves B2B organisations with complex digital operations, including manufacturing, shipping, banking and finance, energy and utilities, healthcare, telecommunications, oil and gas, and retail…
Financial Health
HealthyHealthy · Hiring · 18% CAGR over 2y
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
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
RELIANCE CYBER LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides managed cyber security services including monitoring and management of IT security infrastructure, managed detection and response, threat intelligence and vulnerability management. Also…
Serves businesses and organisations across the UK and Ireland, especially those with security teams, critical digital infrastructure, compliance needs, or exposure to cyber threats.
Financial Health
DistressedDistressed · -64% CAGR over 5y
Location
FIRST RESPONSE (EUROPE) LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides cybersecurity, digital forensics and incident response services. Offers Microsoft 365 security assessments, Active Directory audits, managed security operations centre monitoring, and…
Serves organisations needing cyber resilience and incident support, including banks, law firms, energy and manufacturing companies, and public sector bodies, with emphasis on Microsoft 365 users.
Financial Health
StrongStrong · Hiring · 4% CAGR over 4y
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
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
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
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
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
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
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops AI‑driven cybersecurity software that monitors network, cloud and identity activity to detect and respond to cyberattacks. Provides network detection and response (NDR) platforms, threat…
Sells to enterprise security, SecOps and SOC teams, including organisations in finance, healthcare, higher education, public sector and critical infrastructure that manage network, cloud and identity…
Financial Health
StrongStrong · Hiring · 10% CAGR over 4y
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
SECON CYBER SECURITY LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides cyber security consultancy and managed security services, including security architecture design, governance, risk and compliance advisory, zero trust strategy, incident response readiness,…
Serves UK businesses and other organisations, particularly IT and security leaders needing cyber security guidance, managed security services, risk management, compliance support, and incident…
Financial Health
StableStable · -20% CAGR over 2y
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
LEFTBRAIN LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides cyber security consulting and managed security services for cloud‑based businesses, including ISO 27001 and Cyber Essentials certification support, virtual CISO and governance programmes,…
Serves B2B cloud-first and SaaS companies, especially fast-moving hybrid teams that need to pass enterprise due diligence, achieve ISO 27001 or Cyber Essentials certification, and support secure…
Financial Health
StrongStrong · Hiring · 20% CAGR over 4y
Location
Provides corporate intelligence and cyber security consulting services, including cyber incident response, managed security, digital forensics, offensive security testing, due diligence, disputes and…
Serves businesses and organisations worldwide across sectors, particularly corporate leadership, security teams, deal teams, investors, and legal or compliance teams facing cyber, transaction,…
Location
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides cybersecurity consulting and services including incident response, threat hunting, managed detection and response (MDR), cyber readiness assessments, red and purple team testing, threat…
Serves global enterprises and CISOs, including organisations in crypto, retail, financial services, healthcare, law, logistics and transportation, industrial systems, telecoms and technology.
Financial Health
WeakWeak · -13% CAGR over 2y
Location
CYBERCX UK LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides cyber security services including incident response, penetration testing, vulnerability assessments, managed security services, digital forensics, identity and access management, governance…
Serves UK enterprise and government organisations, including businesses of varying sizes in sectors such as wellness, information services and software development, and leaders responsible for cyber…
Financial Health
HealthyHealthy · 0% CAGR over 3y
Location
Trajectory
3y · 2020–NowFinancial sub-scores
Computed from 3 filingsDevelops cybersecurity software that monitors and analyses organisational IT activity to detect and investigate threats. Provides an AI-driven security operations platform with automated alert…
Serves B2B security operations teams at organisations with legacy SIEM or MDR setups, especially lean or resource-constrained SOCs across industries.
Financial Health
StrongStrong · Growing · 3% 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
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
Six Degrees
Provides managed cloud infrastructure, hybrid cloud and colocation services, including Azure management, backup and migration. Delivers cyber security consulting and managed detection and response,…
Targets IT and security decision-makers in UK mid-market and enterprise organisations, including public-sector bodies, that run complex cloud, network, Microsoft workplace and cyber security…
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
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
TORO RISK SOLUTIONS - GLOBAL LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides cyber, physical and converged security services including risk assessments, security audits, penetration testing, incident response, managed detection and response, investigations, due…
Serves businesses, government and public sector organisations seeking cyber, physical and investigative security support, typically engaging risk, security, IT and resilience leaders responsible for…
Financial Health
StrongStrong · Hiring · 38% CAGR over 2y
Location
NG SECURITY (UK) LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides cyber security consultancy and technical services including Cyber Essentials and governance compliance support, security posture reviews, virtual CISO services, cyber risk profiling, managed…
Serves businesses and organisations needing cybersecurity support, targeting IT and security leaders seeking help with compliance, risk management, managed security services, penetration testing and…
Financial Health
HealthyHealthy · -49% CAGR over 4y
Location
Jumpsec Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides cybersecurity consultancy and testing services, including penetration testing, red teaming, vulnerability scanning, cloud and web application security assessments, incident response, attack…
Targets UK organisations with security, risk or IT teams, including regulated businesses needing CREST/CHECK assurance, PCI DSS, DORA/TIBER-EU alignment, incident readiness and 24/7 security support.
Financial Health
DistressedDistressed · -12% 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
CYPFER LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides cybersecurity incident response and ransomware recovery services. Conducts digital forensics, breach and cloud investigations, dark web monitoring, and cyber risk assessments, and offers…
Serves businesses, critical infrastructure operators and organisations with legal/eDiscovery needs worldwide, targeting security, IT, risk and legal teams responding to cyber incidents or managing…
Financial Health
StableStable · Hiring · 122% CAGR over 1y
Location
4 Data Solutions Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides cybersecurity, data observability and compliance consulting. Implements and supports platforms such as Splunk and other security tools, offering architecture, deployment, optimisation and…
Serves businesses and public-sector organisations with complex cloud or on-premise data environments, especially security, compliance and IT teams using Splunk and related cyber/data platforms.
Financial Health
DistressedDistressed · -13% CAGR over 2y
Location
Continent 8
Provides managed IT infrastructure, cloud hosting, network connectivity, and cybersecurity services for iGaming and online betting operators, including colocation, DDoS protection, threat monitoring,…
Serves global iGaming and online sports betting operators, suppliers and brands, especially regulated platforms needing compliant technology, connectivity and security partners.
Location
Six Degrees
Provides cloud and IT managed services including private, public and hybrid cloud hosting, colocation, connectivity, and backup platforms. Also delivers cybersecurity services such as penetration…
Serves UK organisations across commercial and public sectors, targeting IT and security leaders responsible for cloud, connectivity, cyber security and Microsoft workplace environments.
Financial Health
Insufficient historyInsufficient history
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
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
Digital Craftsmen
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides managed cloud hosting, infrastructure-as-a-service and cyber security services. Offers public, private and hybrid cloud hosting, cloud migration, penetration testing, managed security…
Serves B2B organisations and public sector bodies, including digital agencies, financial services, insurance, education, e-commerce, retail, transport, and local and central government departments.
Financial Health
StableStable · 0% CAGR over 4y
Location
Qamine Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides cybersecurity services including penetration testing, vulnerability scanning, security monitoring, and cyber security assessments. Evaluates websites, networks and cloud infrastructure to…
Serves businesses and organisations with websites, internal networks or cloud platforms, particularly information security teams needing external cyber security support.
Financial Health
WeakWeak · Hiring · 22% CAGR over 2y
Location
Abacus Group
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides managed IT services, cloud hosting, and cybersecurity solutions for financial services firms, including compliance support, disaster recovery, managed detection and response, vulnerability…
Serves B2B financial services firms globally, especially investment firms needing outsourced or co-managed IT, cloud, cybersecurity and compliance support for distributed workforces.
Financial Health
StrongStrong · Hiring · 116% CAGR over 1y
Location
PDQ Technologies Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides managed IT support, cyber security and IT consultancy services for businesses. Offers penetration testing, security monitoring, cloud services, Microsoft 365 solutions, backup, and…
Serves UK businesses across diverse industries, targeting organisations that need outsourced IT support, cyber security, cloud infrastructure and Microsoft services.
Financial Health
StrongStrong
Location
Know 3 Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides managed IT support and cybersecurity services, including security operations, firewall and email security, penetration testing, cloud transformation, IT strategy consultancy, infrastructure…
Sells to businesses seeking outsourced IT, cybersecurity and communications support, especially leadership teams and boards concerned with resilience, compliance and cyber risk. Targets organisations…
Financial Health
StableStable · 0% CAGR over 4y
Location
Disclosure Cybersecurity Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides cybersecurity consulting and software for continuous security assessment and monitoring. Conducts vulnerability and technical security assessments, advises on information security…
Serves government bodies, commercial organisations and non-profit institutions with data protection, cyber risk and compliance requirements such as GDPR.
Financial Health
StrongStrong · Growing, Hiring · 63% CAGR over 4y
Location
Cloud Lighthouse Limited
Trajectory
1y · 2025–NowProvides managed IT support and cybersecurity services for businesses, including remote and onsite technical support, threat monitoring and protection. Also offers professional IT services, business…
Serves UK businesses of all sizes and industries seeking outsourced IT, cyber security and technology support, including organisations needing managed remote and onsite services.
Financial Health
Insufficient historyInsufficient history
Location
IT CLOUD SOLUTIONS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides managed IT services including cloud infrastructure, network connectivity, cybersecurity monitoring and response, and digital workplace solutions. Offers consulting, integration, and ongoing…
Targets CIOs and IT leaders at digital-first enterprises, including global organisations across sectors such as mining, with needs around cloud, connectivity, security, workplace and sustainability…
Financial Health
DistressedDistressed
Location
HEXEGIC LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides cyber security and data consultancy services, including risk assessments, managed security services, cyber awareness training, and incident response. Also delivers data strategy, data…
Serves government, intelligence and corporate organisations, plus high-performing businesses seeking support with cyber resilience and data capability.
Financial Health
StrongStrong · Growing, Hiring · 41% CAGR over 4y
Location
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How London SecOps companies work and how to sell to them
What they do
SecOps firms earn most of their revenue from managed detection, alert triage, incident response retainers and operational security consultancy. Pricing is typically recurring, with service tiers shaped by monitored assets, log volumes, coverage hours, response commitments and reporting cadence. One-off work still matters, particularly onboarding, control reviews, tabletop exercises and post-incident remediation, but it usually feeds a retained relationship rather than a standalone project pipeline. The offer is less a pure software sale than a service wrapper around security tooling: analysts, escalation processes, ticket workflows, evidence packs and customer-facing reporting all sit inside the contract.
Who they sell to
Typical customers are mid-market organisations with security accountability but limited internal capacity for continuous monitoring and incident coordination. In London, the more plausible buyers are regulated financial-services, professional-services and digital businesses that need evidence of oversight, not just advice after an incident. Decision makers tend to include CISOs, heads of infrastructure, risk teams and finance directors, with procurement involved once access to sensitive systems is in scope. Contract value is usually linked to estate size and service cover. Sales cycles are shorter for urgent gap cover, but lengthen when buyers require assurance documents, trial monitoring, legal review and board sign-off.
What they buy
Most SecOps firms tend to spend on the tools and services that make analyst time more usable. Common categories include log management, endpoint telemetry, cloud security monitoring, case management, ticketing, automation, threat intelligence, vulnerability management and reporting. They also buy the less glamorous inputs behind a credible service: cloud infrastructure, secure storage, identity controls, audit support, privacy advice, professional indemnity cover, technical recruitment, analyst training and marketing that can explain trust without overclaiming. Suppliers with integration, implementation or managed-service experience usually have a clearer route in than those selling a generic horizontal tool with little evidence of fit.
Why and how to sell to them
Buying intent often appears when a provider wins regulated clients, adds analysts, moves from project work into retained monitoring or inherits tighter reporting obligations from a customer’s procurement process. Leadership changes can also open supplier reviews, especially where margins are being squeezed by manual triage, inconsistent evidence capture or slow customer onboarding. Outbound works better when it maps to operational pain: fewer handoffs during incidents, cleaner escalation records, faster customer setup, easier assurance responses and clearer utilisation of analyst time. Claims about generic cyber improvement tend to land poorly; these buyers usually want to see how a vendor affects a service desk, an incident bridge or a monthly review pack.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
Also in London
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