Security Companies Using Site Kit in the UK: 157 Active Firms (2026)
UK security businesses running website measurement tools provide guarding, key holding and related physical protection services in a regulated market.
For physical security operators, the measurement plug-in sits between the public website, search visibility and enquiry capture. Its practical job is to show which service pages, location pages and contact routes generate demand for guarding, key holding, site protection and related contracted work. Adoption tends to signal a business with some marketing budget, an agency or technically capable internal contact, and enough sales process to care about attribution rather than just brochure presence. Buying centres are usually split between directors, operations managers and commercial teams, with website measurement supporting tender visibility, local search and inbound enquiries from commercial, public-sector and infrastructure customers.
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There are 157 UK physical security services businesses in this adoption cohort. Employment reporting is unusually complete: 93 of 93 firms report headcount, giving a reported workforce of 3,444 people. Within the sector’s detected analytics ranking, the system sits second at 12.0%, behind the category’s default measurement tool but ahead of smaller specialist alternatives. The registered-region spread is not London-only: North West and London each account for 15.9% of the cohort, followed by South East at 14.6%, East of England at 12.7% and East Midlands at 8.9%.
Private security procurement is shaped by licensing as much as by lead generation. The Security Industry Authority (SIA), sponsored by the Home Office, regulates the UK private security industry. Where services are supplied under a contract for services and involve licensable activity, front-line operatives need the relevant SIA licence; directors, partners, managers and supervisors may also need front-line or non-front-line cover. For companies running website measurement tooling, that puts service descriptions, contact forms and call-back routes close to regulated claims, especially around manned guarding, key holding and vehicle immobilisation in Northern Ireland.
Adoption appears tied to direct-enquiry discipline rather than experimentation. The cohort skews towards operators that have moved beyond brochure sites but have not necessarily built large in-house growth teams, so the measurement layer is likely to remain bundled with content management, search visibility and form protection. Migration pressure will probably come from consent expectations, browser changes and agency consolidation. Physical security buyers still award much work through tenders and relationship-led sales, so analytics adoption tends to complement bid teams and account management rather than displace them.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
Active director count is the full Companies House board, so it can be higher than the number of names listed — we leave out nominee and formation-agent directors, who aren’t worth contacting. It’s blank for the small number of companies whose officers we haven’t fetched yet.
You’re charged per business, not per row. Where a business trades through several registered companies you get every one, and the Group Primary column marks one row per business — filter to those and the count matches your invoice. Rows sharing a website are not automatically one business: franchises and multi-site operators each count separately, and where names don’t prove a relationship we count them apart rather than guess.
Adoption by company size
Adoption of Site Kit rises with company size across the trading UK security companies in this cohort. 0.9% of the 10,686 companies with under 10 employees run Site Kit (93 detected). 3.9% of the 1,132 companies with 10–50 employees run Site Kit (44 detected). 6.1% of the 293 companies with over 50 employees run Site Kit (18 detected). That is a 5.2% gap between the over 50 employees and under 10 employees bands.
157
Active firms
2026
12%
Of detected Analytics share
UK security
8
Median headcount
Filed accounts
312
Verified directors
Across this cohort
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Key facts
About 5% of the trading cohort reports turnover above £5M (8 of 157 firms) — the rest sits below that revenue band.
4% of the cohort was incorporated since 2022 (7 firms), so a sizeable share is in its first few filing cycles.
Among physical security services companies with a detectable analytics system, the profiled tool appears on 12.0% (157) of 1,309 companies; the largest detected analytics tool appears on 90.1% (1,180).
The cohort is spread beyond London: North West and London each account for 15.9% (25), followed by South East at 14.6% (23) and East of England at 12.7% (20).
Web-stack co-occurrence centres on measurement and enquiry capture: 84.7% (133) also run another analytics tool, 37.6% (59) use tag management and 25.5% (40) run a contact-form tool.
The Security Industry Authority (SIA) regulates private security work supplied under a contract for services where the work involves licensable activity, including manned guarding and key holding.
UK security exports were £12.9 billion in 2024, up 16.6% on 2023; physical security accounted for 33% of the total, worth £4.3 billion.
WordPress plugins market share among UK Security
Share of the 1,309 UK Security with a detectable system. As of June 2026.
What else do Site Kit-running Security run?
Share of the 157 Site Kit-running UK companies where each technology was also detected. As of June 2026.
Where Site Kit Security are, and how healthy they look
By region
By registered-office region; companies without a regional match count toward Rest of UK.
By financial health
From filed accounts; firms with fewer than two filings show as insufficient history.
8
Median headcount
£649.4K
Median UK turnover
5.1%
Above £5M turnover
7
Incorporated since 2022
Verified directors — included in the file
Director names and roles for these 243 businesses, alongside financials and websites, in one Excel + CSV file.
Top UK Security using Site Kit
Ranked by sales-readiness score: an AI model assesses what each company does, its sector and size, and scores its overall fit. Best-fit prospects appear first.
Financial sub-scores
Computed from 2 filingsProvides private security services including manned guarding, close protection, concierge security, and patrols. Serves businesses, construction sites, residential communities, and individuals, and…
Serves high-net-worth individuals, vulnerable people, businesses and corporations, gated communities, industrial/business parks, vacant property owners, embassies, private aviation/airport and…
Financial Health
DistressedDistressed
Location
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- Copeland Group Security Services10693397
Financial sub-scores
Computed from 5 filingsProvides security and site protection services including CCTV monitoring, construction site CCTV systems, manned guarding, mobile patrols, keyholding and alarm response, event security, and lone…
Serves UK organisations needing security support, including construction sites, event operators, facilities teams and businesses with premises requiring monitoring, guarding, patrols, keyholding or…
Financial Health
HealthyHealthy · Hiring · 119% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides security services including manned guarding, retail loss prevention, construction site security, event security, mobile patrols, and key holding with alarm response. Supplies SIA‑licensed…
Sells B2B security services to businesses and property managers, including retail, commercial and construction firms, event organisers, and local authorities. Serves blue-chip clients and…
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides commercial security services including key holding and alarm response, mobile patrols, manned guarding, lock and unlock services for business premises, and inspections and security for…
Serves SMEs, large businesses and public-sector organisations with commercial premises across the North West and wider UK, including sectors such as healthcare, telecoms, builders’ merchants and…
Financial Health
StableStable · Hiring · 4% CAGR over 4y
Location
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- Prosec UK05566185
Financial sub-scores
Computed from 5 filingsProvides security services including manned guarding, mobile patrols, alarm response, key holding, CCTV and alarm monitoring, and event security. Also offers close protection, site and scaffold…
Serves UK businesses, public sector bodies and homeowners, including commercial and industrial premises, offices, schools, hospitals, retail sites, event organisers, construction/scaffolding sites…
Financial Health
StableStable · -9% CAGR over 4y
Location
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Provides security services including manned guarding, mobile patrols, alarm response, key holding, event and retail security, construction site protection, and access control, supplying SIA‑licensed…
Serves small businesses and large organisations across the UK public and private sectors, including construction sites, retailers, event organisers and premises managers.
Financial Health
N/AN/A
Location
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Financial sub-scores
Computed from 5 filingsProvides security and facilities management services including manned security guarding, mobile patrols, key holding and alarm response, CCTV monitoring and installation, construction site security,…
Serves B2B and public-sector clients across the UK, including construction sites, corporate offices, retailers, shopping centres, schools, universities, healthcare providers, transport, logistics,…
Financial Health
HealthyHealthy · Hiring · 10% CAGR over 4y
Location
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- Contract Security08264971
Financial sub-scores
Computed from 2 filingsProvides manned guarding and security services including retail door supervision, key holding, alarm response, CCTV control room operations, event security, patrol services, dog handlers, concierge…
Serves businesses and organisations needing outsourced security, including retailers, facilities managers, commercial premises, event operators, and sites requiring front-of-house or guarding cover.
Financial Health
WeakWeak · -10% CAGR over 1y
Location
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Financial sub-scores
Computed from 4 filingsProvides security services for businesses including manned guarding and front‑of‑house security staff, mobile patrols, remote CCTV and alarm monitoring, guard and search dog units, temporary site…
Serves businesses across the UK, particularly organisations with premises, employees, assets, information, vacant properties or multiple sites requiring managed security support.
Financial Health
StrongStrong
Location
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Financial sub-scores
Computed from 5 filingsProvides security services including rapid deployment CCTV towers, wireless video monitoring systems, and CCTV installation. Also supplies SIA‑licensed manned guarding, mobile patrols, alarm…
Serves UK businesses and site operators, including construction firms, warehouse operators, vacant property owners, utilities, highways and road contractors, and rail infrastructure organisations.
Financial Health
StrongStrong · Growing, Hiring · 13% CAGR over 4y
Location
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Financial sub-scores
Computed from 4 filingsProvides security services including manned guarding, mobile patrols, CCTV monitoring, key holding and alarm response. Delivers security for corporate offices, construction sites, residential…
Serves commercial, public sector and residential customers across southern England, including construction sites, offices, utilities, private estates, cultural venues, events, manufacturers, housing…
Financial Health
StrongStrong · Hiring · 23% CAGR over 3y
Location
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Financial sub-scores
Computed from 3 filingsProvides security and facilities management services including manned guarding, mobile patrols, key holding and alarm response, intruder detection systems, locksmith services, vacant property…
Serves businesses, landlords, asset managers and property managers across the UK responsible for commercial, vacant or managed buildings requiring outsourced security, facilities, locksmith, cleaning…
Financial Health
StrongStrong · Growing, Hiring · 164% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsProvides security guarding services for businesses and organisations, including door supervisors, retail security, event security, construction site and residential guards, concierge and CCTV…
Serves businesses of all sizes, public-sector organisations, retailers, hospitality venues, event organisers, construction and industrial sites, schools, airports, residential property owners and VIP…
Financial Health
HealthyHealthy · -12% CAGR over 5y
Location
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Financial sub-scores
Computed from 4 filingsProvides manned security services including security guarding, key holding and alarm response, mobile patrols, door supervisors, and event security. Also offers CCTV and remote video monitoring,…
Serves businesses, public sector sites and some domestic customers across South West England and South Wales, including commercial premises, logistics operators, construction sites, event organisers,…
Financial Health
WeakWeak · Hiring · 91% CAGR over 3y
Location
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Financial sub-scores
Computed from 5 filingsProvides security services for commercial, residential and public sector clients, including SIA‑licensed security guards, mobile patrols, alarm response, key holding, CCTV monitoring, concierge and…
Serves private and public sector clients, including homeowners, commercial and industrial premises, property owners/managers with vacant sites, student housing operators, and businesses needing…
Financial Health
WeakWeak · -69% CAGR over 4y
Location
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Financial sub-scores
Computed from 4 filingsSupplies and installs temporary security systems for construction sites, scaffolding and vacant properties, including solar and wired CCTV units, motion detection devices, fire and site alarms, and…
Serves construction contractors, scaffolding firms, vacant property owners/managers and site operators across the UK needing temporary site security and protection for projects, equipment and…
Financial Health
HealthyHealthy · -52% CAGR over 3y
Location
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Financial sub-scores
Computed from 5 filingsProvides security services for businesses, events and public sites, including SIA‑licensed security guards, mobile patrols, CCTV monitoring, K9 units, event security, key holding and alarm response.…
Serves UK businesses, event organisers and public-sector bodies, with target sectors including construction, corporate, healthcare, hospitality, industrial, logistics, manufacturing, retail and…
Financial Health
StableStable · -4% CAGR over 5y
Location
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Financial sub-scores
Computed from 3 filingsProvides private security services including onsite security guards, mobile patrols, keyholding and alarm response. Also offers close protection for individuals, security consultancy, risk…
Serves a mix of B2B and private clients in London, including residential, commercial and educational site operators, property managers, and high-net-worth individuals.
Financial Health
DistressedDistressed · -45% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsProvides security services including manned guarding for businesses, education institutions and public sector organisations. Supplies trained security personnel to protect premises, staff and assets,…
Serves public, private and third-sector organisations, including businesses, schools and public sector bodies needing security for premises, staff and visitors.
Financial Health
WeakWeak · Hiring · 29% CAGR over 5y
Location
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Financial sub-scores
Computed from 5 filingsProvides security services including manned guarding, mobile patrols, key holding and alarm response. Installs and monitors CCTV and alarm systems, and operates a monitoring centre offering personnel…
Serves private and commercial clients across Shropshire and the UK, including homeowners, business parks, construction sites, and organisations responsible for lone workers, key personnel,…
Financial Health
HealthyHealthy · Hiring · 8% CAGR over 5y
Location
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- Classic Services (CSG)14759934
Financial sub-scores
Computed from 5 filingsProvides commercial security services including CCTV and alarm system installation, alarm receiving centre monitoring, manned guarding, mobile and K9 patrols, keyholding, and access control. Also…
Serves businesses and property owners/managers with vacant properties and operational sites, including facilities managers, building managers and compliance-led organisations across Sussex, Surrey…
Financial Health
StrongStrong · Growing, Hiring · 10% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides business security services including installation of CCTV, intruder alarms, access control and fire detection systems. Also supplies temporary site security such as rapid‑deployment CCTV…
Sells to B2B customers with premises or temporary sites to protect, including commercial property owners, facilities managers, construction site operators and organisations managing assets vulnerable…
Financial Health
StrongStrong
Location
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Computed from 5 filingsProvides private security services including manned guarding, K9 security and sniffer dog teams, mobile patrols, keyholding and alarm response, CCTV monitoring, and security for retail sites, events,…
Serves businesses, event organisers, construction sites, retailers and property owners needing private security support across Yorkshire, West Yorkshire and the wider UK.
Financial Health
HealthyHealthy · Hiring · 50% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides security, cleaning and facilities management services for commercial premises, including security guards, mobile patrols, key holding, vacant property protection, commercial CCTV systems,…
Serves UK businesses and commercial premises managers, including offices, medical facilities, vacant properties and event sites, with buyers responsible for premises, operations and facilities.
Financial Health
HealthyHealthy
Location
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Financial sub-scores
Computed from 4 filingsProvides manned guarding and security services including keyholding, alarm response, mobile patrols and lock-ups. Installs and monitors electronic security systems such as CCTV, intruder alarms,…
Serves businesses and organisations in Northampton and Northamptonshire needing site security, including commercial premises, transport firms, automotive businesses, professional services and event…
Financial Health
StableStable · -79% CAGR over 3y
Location
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Financial sub-scores
Computed from 3 filingsProvides security services including manned guarding, close protection, CCTV and alarm monitoring, key holding, and security for events, venues, retail, and hospitality. Also delivers SIA-related…
Serves businesses needing security services, including venues, stadia, festivals, hospitality and leisure operators, retailers and property sites, and sells training to new and experienced security…
Financial Health
StableStable · -62% CAGR over 2y
Location
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Computed from 4 filingsProvides security services for residential and commercial properties, including manned guarding, mobile patrols, keyholding and alarm response. Installs and monitors CCTV and intrusion detection…
Serves businesses, residential property clients and event organisers needing security services, including commercial sites, vacant properties and concierge-managed locations. Targets customers…
Financial Health
WeakWeak · -11% CAGR over 3y
Location
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Financial sub-scores
Computed from 3 filingsProvides fire safety and security services for commercial and institutional premises, including fire risk assessments, fire marshal training, fire door inspections, extinguisher servicing, emergency…
Serves local businesses and organisations needing fire safety and security support, including construction sites, commercial premises, caravan and holiday home operators, farms, healthcare providers,…
Financial Health
DistressedDistressed · -22% CAGR over 2y
Location
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Computed from 3 filingsProvides manned security services including security guards, mobile patrols, key holding and alarm response. Installs and monitors CCTV systems and access control, and conducts lock and unlock…
Serves businesses and private clients, including commercial premises managers, vacant property owners, site operators and households seeking security support across the Midlands and wider UK.
Financial Health
HealthyHealthy · Hiring · 53% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsProvides security services including manned guarding, mobile patrols, keyholding and alarm response for commercial and educational premises. Supplies SIA-licensed security personnel for site…
Serves businesses and education-sector organisations, especially universities, colleges and schools, across London, Hertfordshire, Berkshire, Buckinghamshire, Cambridgeshire, Bedfordshire and the…
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
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Computed from 3 filingsProvides private security services including SIA‑licensed security guards, manned guarding, event stewarding, door supervision, close protection, dog handling, and concierge security. Also offers…
Serves businesses, property managers and organisations in London across events, retail, car parks, construction sites, corporate offices, hotels, residential developments, schools and nightclubs.
Financial Health
StrongStrong · Hiring · 88% CAGR over 2y
Location
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Computed from 4 filingsProvides SIA‑licensed security services including manned guarding, door supervision, close protection, event and retail security, CCTV monitoring and key holding. Also delivers commercial, industrial…
Serves UK businesses, organisations and households, including corporate offices, retailers, hospitality venues, logistics sites, events and festivals, schools, healthcare settings, construction sites…
Financial Health
StrongStrong · Growing, Hiring · 34% CAGR over 3y
Location
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Computed from 5 filingsProvides facilities management services including security guarding, retail security, mobile patrols, gatehouse and concierge services, along with commercial cleaning, grounds maintenance, and…
Serves UK businesses of all sizes needing outsourced facilities support, including construction operators, retail outlets, corporate offices, business centres, distribution hubs and…
Financial Health
HealthyHealthy · -5% CAGR over 4y
Location
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Computed from 4 filingsProvides security services for commercial, residential and events, including manned guarding, door supervision, close protection, mobile patrols, key holding and alarm response. Also supplies…
Serves commercial and residential clients, event organisers, schools, retail sites, bars, hotels, charities, housing associations and private individuals, with customer examples focused on Essex.
Financial Health
StableStable · -78% CAGR over 3y
Location
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Computed from 5 filingsProvides security services for businesses and properties, including key holding, 24/7 alarm response, mobile patrols, lock and unlock services, and manned guarding. Installs and manages CCTV,…
Serves businesses, facilities managers and property owners across the North West of England, with some homeowner demand where premises, staff, assets or access need protection.
Financial Health
StableStable · -1% CAGR over 5y
Location
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Computed from 5 filingsProvides SIA-licensed security services including door supervisors for bars and nightclubs, security officers for buildings and car parks, event security staffing, key holding and alarm response, and…
Serves bars, nightclubs and other licensed venues, event organisers, retailers, corporate buildings, car parks, and commercial or residential premises needing outsourced security staff and response…
Financial Health
HealthyHealthy · Hiring · 16% CAGR over 4y
Location
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Computed from 5 filingsProvides security services including manned guarding, event and festival security, retail loss prevention, corporate and property security, close protection, CCTV systems and alarm monitoring, along…
Serves B2B clients including event and festival organisers, venues and stadia, hospitality and leisure operators, night-time economy businesses, retailers, corporate organisations and property…
Financial Health
HealthyHealthy · Hiring · 18% CAGR over 4y
Location
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Computed from 3 filingsDesigns, installs and maintains integrated security systems including perimeter and electrified fencing, intruder detection, CCTV surveillance, access control, and control room monitoring. Provides…
Serves public-sector and enterprise owners/operators of critical national infrastructure, defence estates, utilities, data centres and other high-security or space-constrained sites across the UK and…
Financial Health
StableStable · -89% CAGR over 2y
Location
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Computed from 5 filingsProvides commercial security and facilities services including security officers, CCTV monitoring, key holding and alarm response, concierge and front‑of‑house support, and office and commercial…
Serves businesses and organisations of all sizes across Liverpool and the North West with premises requiring outsourced security, front-of-house, keyholding, facilities and cleaning support.
Financial Health
HealthyHealthy · -8% CAGR over 4y
Location
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Computed from 5 filingsProvides recruitment and temporary staffing for industrial, warehouse, hospitality and driving roles, supplying pickers, packers, production staff, chefs and waiters. Also delivers security services…
Serves UK businesses needing temporary, contract or permanent staff, especially industrial, warehouse, hospitality and driving employers, plus events venues, offices, schools and hospitals requiring…
Financial Health
DistressedDistressed · -27% CAGR over 4y
Location
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Computed from 5 filingsDesigns and installs integrated security systems for commercial premises, including CCTV surveillance, access control, intruder alarms, perimeter protection, and fire and life safety systems.…
Serves small and large businesses across the UK and Ireland, including commercial, industrial and multi-site operators with premises security and life-safety requirements.
Financial Health
DistressedDistressed
Location
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- CSP07621006
Financial sub-scores
Computed from 5 filingsProvides event and venue operational services including car park design and management, traffic management on public highways, hostile vehicle mitigation barrier installation, safety stewarding and…
Serves B2B event and venue operators, including stadiums, arenas, heritage locations, major outdoor events and static sites, as well as organisers managing visitor, crew and public access operations.
Financial Health
WeakWeak · -16% CAGR over 4y
Location
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Computed from 3 filingsProvides security and visitor management services for events and organisations, including manned guarding, door supervision, crowd management and stewarding. Also supports event planning and…
Serves UK event organisers, public sector bodies, venues and businesses needing security, stewarding and visitor management, including corporate, state, sporting, charity, hospitality, construction,…
Financial Health
WeakWeak · -88% CAGR over 2y
Location
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- Clarion UK06984274
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Computed from 5 filingsProvides design, installation and maintenance of electronic security systems for commercial, industrial and public sector sites, including CCTV surveillance, access control systems, intruder alarms,…
Serves commercial, industrial and public sector organisations across Manchester, the North West and the UK, including schools, universities, hospitals, offices, data centres and warehouses.
Financial Health
StableStable · -10% CAGR over 4y
Location
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Computed from 3 filingsProvides commercial cleaning and facilities services for businesses, including contract cleaning, security services, janitorial supplies, washroom servicing, pest control, and bio‑misting…
Serves SMEs, large enterprises and institutions in Wales, Bristol and South West England, across healthcare, industrial, leisure, office, retail, and schools/education sectors.
Financial Health
WeakWeak · -5% CAGR over 2y
Location
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Computed from 5 filingsProvides security systems and monitoring services for construction and infrastructure sites, including CCTV surveillance, motion detection, sound and light alarms, access control, and monitoring…
Serves UK construction and infrastructure organisations, including construction managers, main contractors, large-scale project teams, and public sector partners responsible for sites such as…
Financial Health
StableStable · 0% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides security consultancy, risk assessment and project management for organisations operating in complex environments. Delivers close protection, security guarding, journey management, crisis…
Serves government bodies, corporate organisations, small businesses, and high-net-worth individuals needing security, project management, and specialist consultancy, especially in complex or hostile…
Financial Health
HealthyHealthy · Growing · 1% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides construction and aviation logistics support services, including building material movement, waste management, facility maintenance, access control, passenger assistance, crowd management,…
Serves B2B customers in aviation, construction, civil engineering and utility protection, including principal contractors, UK airports, airlines, first-tier suppliers and retail operators needing…
Financial Health
DistressedDistressed · -48% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides commercial cleaning and facilities support services, including window and high‑level cleaning, specialist internal and external building cleaning, decontamination, roof cleaning, grounds…
Serves UK commercial and institutional clients, including facilities and property management companies, offices, retailers, schools and healthcare organisations needing outsourced building support…
Financial Health
StableStable · 2% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsDesigns, installs and maintains commercial fire and security systems, including fire alarms, CCTV surveillance, access control, intruder and panic alarms, emergency lighting, fire extinguishers and…
Serves businesses of all sizes with commercial premises across the Midlands, London and the Home Counties, including organisations needing building safety and security systems for offices, sites and…
Financial Health
DistressedDistressed · 0% CAGR over 4y
Location
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How Site Kit usage is detected
Company data
Detected companies are joined to UK Companies House records and XBRL accounts data. 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.
Detection
Firmbase crawls the public website of actively-trading UK companies and fingerprints the technologies present: tracking scripts, embedded forms, chat widgets, CMS markers and similar signatures. A company is included in this list when one or more of the technology's signatures are found on its site; closely-related variants of the same product are grouped under one name. Detection covers what is visible on the public web — a company using the technology purely internally, with no website footprint, will not appear. Counts are therefore a conservative floor, not a ceiling. security companies are identified using Firmbase's semantic classification of company activity, built from filings, websites and registered SIC codes rather than SIC codes alone. The detected counts and share figures on this page are computed within that sector cohort, so "share" always means share of security companies with a detectable system — not of all UK companies.
Freshness
Websites are re-crawled on a rolling basis and the underlying company data is refreshed from Companies House continuously; filings appear within days of submission. The list and its statistics are regenerated when the detected cohort moves meaningfully. You can see the last-updated timestamp near the top of the page.
Site Kit is a trademark of its respective owner. Firmbase is not affiliated with, sponsored by, or endorsed by the trademark owner.
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Frequently asked questions
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