IT Services Companies Using Google Tag Manager in the UK: 1,864 Active Firms (2026)
IT services providers running web tag management in the UK deliver managed infrastructure, support and digital operations while instrumenting sites for analytics.
For IT services providers, tag management sits between marketing operations, web development and sales attribution rather than inside core service delivery. Running this system usually points to a provider with enough direct-channel activity to care about campaign attribution, conversion events and remarketing governance, but not necessarily a large internal marketing department. The buying centre is typically split between commercial teams that want clearer pipeline measurement and technical teams that control release processes, security review and client-facing site performance. Engagements tend to be managed-service or project-led, with analytics configuration folded into broader digital operations.
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Across the UK, 1,864 actively trading IT services providers are detected running this tag-management system. Within the sector’s detected tag-manager mix, it sits first with a 99.6% share, compared with 0.9% for the nearest alternative, which suggests the category is effectively standardised around a common default choice. Reported headcount totals 6,823. Adoption is skewed towards London at 24.6% and the South East at 18.6%, with the North West at 10.0%, the South West at 8.8% and the West Midlands at 8.0%.
Tag deployment does not remove privacy and cookie obligations: it usually moves them closer to day-to-day web operations. IT services providers selling managed infrastructure, systems integration or outsourced support will often have clients that expect evidence of consent handling, clear ownership of scripts, and auditability over changes. Where tags touch personal data, cookies or behavioural measurement, buyers tend to ask who can publish changes and how those changes are reviewed. Public-sector and regulated commercial clients may also treat uncontrolled marketing scripts as a security and procurement issue, especially where an external agency can alter tags outside the change-control process used for core systems.
Adoption appears mature rather than speculative. For IT services providers, the next phase tends to sit in governance: cleaner consent flows, tighter control over who can publish tags, and better separation between marketing experimentation and security-managed web infrastructure. Smaller providers may keep relying on standard client-side deployment because it is familiar and cheap to maintain. Larger managed-service firms appear more likely to centralise ownership with web operations or revenue operations teams, especially where public-sector or regulated clients scrutinise data handling. Consolidation in adjacent marketing stacks may reduce separate tool sprawl, but tag governance is unlikely to disappear.
Adoption by company size
Adoption of Google Tag Manager rises with company size across the trading UK IT services companies in this cohort. 0.9% of the 119,548 companies with under 10 employees run Google Tag Manager (1,119 detected). 30.6% of the 2,157 companies with 10–50 employees run Google Tag Manager (661 detected). 45.3% of the 181 companies with over 50 employees run Google Tag Manager (82 detected). That is a 44.4% gap between the over 50 employees and under 10 employees bands.
1,864
Active firms
2026
99.6%
Of detected Tag managers share
UK IT services
7
Median headcount
Filed accounts
4,105
Verified contacts
Across this cohort
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Key facts
About 7% of the trading cohort reports turnover above £5M (134 of 1,864 firms) — the rest sits below that revenue band.
6% of the cohort was incorporated since 2022 (126 firms), so a sizeable share is in its first few filing cycles.
Within detectable tag managers in UK IT services, one system accounts for 99.6% (1,864) of the 1,871 companies with a detectable system; the next system is at 0.9% (17).
Registered-office concentration is highest in London at 24.6% (459), followed by South East 18.6% (347), North West 10.0% (187), South West 8.8% (164) and West Midlands 8.0% (150).
Co-detected web-stack signals skew towards content-management and network-security layers, at 65.3% (1,217) and 49.9% (931) respectively.
Adjacent service tags overlap with the cohort: cybersecurity appears on 27.4% (510), telecommunications on 14.4% (269), marketing agency on 11.8% (220) and AI & Machine Learning on 10.4% (193).
Tag manager market share among UK IT Services
Share of the 1,871 UK IT Services with a detectable system. As of June 2026.
What else do Google Tag Manager-running IT Services run?
Share of the 1,864 Google Tag Manager-running UK companies where each technology was also detected. As of June 2026.
Where Google Tag Manager IT Services 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.
7
Median headcount
£560.4K
Median UK turnover
7.2%
Above £5M turnover
126
Incorporated since 2022
4,105 verified decision-maker contacts
across these 1,864 companies, with emails available in Firmbase. Filter by role, seniority and stack.
Top UK IT Services using Google Tag Manager
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 4 filingsProvides subscription-based managed IT and cybersecurity services, including 24/7 helpdesk support, cloud and infrastructure management, incident detection and response, vulnerability scanning, and…
Serves B2B organisations globally, from fast-moving scale-ups to enterprises operating across multiple countries, particularly teams needing ongoing IT, cybersecurity, compliance and security testing…
Financial Health
StrongStrong · Growing, Hiring · 40% CAGR over 3y
Location
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Financial sub-scores
Computed from 5 filingsProvides managed IT and cloud services including public, private and hybrid cloud infrastructure, multicloud management across AWS, Azure and GCP, DevOps and Kubernetes support, IT infrastructure…
Serves businesses of all sizes needing managed cloud and IT infrastructure, including enterprises using AWS, Azure, Google Cloud or Alibaba Cloud, telecoms operators, ISPs, IPTV providers, and…
Financial Health
HealthyHealthy · Hiring · 5% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides managed cloud infrastructure and hosting services, including public and private cloud, object storage, backup, disaster recovery, cybersecurity monitoring, and network connectivity, helping…
Serves IT, security and infrastructure teams in businesses and public sector organisations, with industry focus on education, financial services, government and healthcare, plus technology partners.
Financial Health
HealthyHealthy · -63% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides managed IT services for businesses, including technical support, remote monitoring, cloud and Microsoft 365 migration, cybersecurity services, VoIP phone systems, data backup and recovery,…
Serves businesses in Hampshire, Dorset, Wiltshire and Sussex, including organisations needing outsourced IT support and those with in-house IT teams seeking technical collaboration.
Financial Health
StrongStrong · Hiring · 16% CAGR over 4y
Location
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Financial sub-scores
Computed from 4 filingsProvides managed IT services including cybersecurity, cloud and datacentre infrastructure, network connectivity, telephony, Microsoft consulting, and bespoke software development, with 24/7 support…
Serves UK businesses and public-sector organisations, including manufacturers, retailers, business parks, financial and legal firms, healthcare providers, hospitality and leisure operators,…
Financial Health
StrongStrong · Profitable, Growing, Hiring · 16% CAGR over 3y
Location
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Financial sub-scores
Computed from 4 filingsProvides IT consulting and technology solutions for enterprises, including digital transformation, cloud and hybrid work infrastructure, collaboration systems, enterprise networking, cybersecurity,…
Serves enterprise organisations, business leaders and technology teams seeking B2B IT partners for digital transformation, with emphasis on ESG and sustainability-conscious buyers in the UK.
Financial Health
StrongStrong · Growing, Hiring · 63% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides managed IT services, cybersecurity, cloud and AI solutions, and business software implementation. Offers process automation, data analytics, Microsoft 365 and Dynamics systems, intranet and…
Serves UK businesses and organisations seeking outsourced or co-managed IT, cyber security, cloud, AI, automation and Microsoft business application support, typically engaging IT, operations and…
Financial Health
HealthyHealthy · Hiring · 14% CAGR over 4y
Location
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Computed from 4 filingsProvides IT infrastructure and technology services including hybrid cloud and datacentre solutions, cybersecurity, networking, managed IT services, hardware and software supply, and professional…
Serves businesses and organisations with internal IT, operations and leadership teams responsible for cloud infrastructure, cybersecurity, networking, Microsoft environments, workplace technology,…
Financial Health
StrongStrong · 53% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsProvides managed IT and cyber security services including disaster recovery, managed backup, cloud infrastructure management, threat detection, penetration testing, and compliance advisory. Supports…
Serves businesses and organisations needing managed IT and cyber support, with sector focus on financial services, legal firms, private equity, restructuring, charities and not-for-profits, and…
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides automated managed IT services including service desk support, network and infrastructure management, cloud architecture, identity and access management, and security operations. Also…
Serves IT teams and business leaders in public and private sector organisations, including transport and logistics, retail, manufacturing, financial services and not-for-profit organisations.
Financial Health
StrongStrong · Growing, Hiring · 3% CAGR over 4y
Location
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Computed from 2 filingsProvides Microsoft-focused IT consulting and managed services, including identity and access management, cybersecurity, cloud transformation, and endpoint management. Delivers security operations,…
Serves B2B organisations and institutions using Microsoft environments, including legal, retail, utilities, healthcare, manufacturing, higher education, financial services and professional services…
Financial Health
StrongStrong · Hiring · 96% CAGR over 1y
Location
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Computed from 5 filingsProvides outsourced IT services, cybersecurity, and cloud infrastructure solutions for alternative investment firms, including design and management of IT environments, public cloud migration on AWS…
Serves B2B clients in the alternative investment industry, including investment firms that need outsourced IT, cybersecurity and cloud support for sensitive data, compliance and investor-facing…
Financial Health
HealthyHealthy · Hiring · 37% CAGR over 4y
Location
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Financial sub-scores
Computed from 3 filingsProvides information technology consulting and outsourcing services, including cloud infrastructure management, data analytics, AI and machine learning solutions, application modernization, digital…
Serves B2B organisations in banking and financial services, insurance, manufacturing, retail and CPG, automotive, and life sciences, typically engaging technology, operations, data and digital…
Financial Health
StrongStrong · Hiring · 18% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsProvides IT consultancy and digital transformation services including software development, data and analytics solutions, cloud and platform implementation, cybersecurity, digital workplace…
Serves B2B clients, mainly large organisations and enterprises across 50 countries, including teams with complex IT, data, cloud, Microsoft 365, information management and managed service needs.
Financial Health
StrongStrong · Profitable, Growing, Hiring · 21% CAGR over 4y
Location
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Computed from 5 filingsProvides managed IT services including help desk support, network and data centre management, cybersecurity monitoring, firewall management, and cloud services. Also conducts penetration testing,…
Serves business owners and IT decision-makers across charity, financial services, hospitality, legal, healthcare, retail, manufacturing, education and public sector organisations.
Financial Health
StrongStrong · Growing, Hiring · 17% CAGR over 4y
Location
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Computed from 5 filingsProvides IT services including managed IT support, hybrid and cloud infrastructure, cybersecurity, disaster recovery, and managed print. Also supplies hardware maintenance and support for enterprise…
Serves SMBs and enterprise organisations, including IT teams in government and public sector bodies, hospitality, professional services, OEMs and other businesses operating across multiple countries.
Financial Health
StrongStrong · Hiring · 34% CAGR over 4y
Location
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Computed from 5 filingsProvides managed IT services including technical support, service desk, IT consultancy, infrastructure management, cloud solutions, cybersecurity, backup and disaster recovery, VoIP telephony, and…
Sells to organisations needing managed IT services, particularly schools, healthcare and social care providers, hospices, legal firms, and high-growth technology businesses. Serves business and…
Financial Health
StrongStrong · Growing, Hiring · 5% CAGR over 4y
Location
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Computed from 2 filingsProvides IT infrastructure and cloud services including hybrid cloud design and deployment, data centre consolidation, containerised data centres, cybersecurity, managed IT support, and multi‑vendor…
Serves UK commercial and public sector organisations, particularly IT leaders and in-house IT teams seeking hybrid cloud, data centre, cybersecurity and managed IT support.
Financial Health
HealthyHealthy · Profitable, Hiring · 20% CAGR over 1y
Location
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Financial sub-scores
Computed from 3 filingsProvides outsourced database and server managed services, including monitoring, administration and support for Oracle, SQL Server, MySQL and PostgreSQL systems. Also offers cloud migration, database…
Serves B2B and public sector organisations that rely on database, server and application infrastructure, including large corporates, growing SMEs, local authorities and higher education institutions,…
Financial Health
StrongStrong · -2% CAGR over 2y
Location
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Computed from 5 filingsProvides IT services and consulting including AI and machine learning development, cloud services, cybersecurity, networking, data analytics, DevOps, mobile app development, and digital…
Serves large enterprises and public-sector organisations seeking technology, managed IT and workforce services, with sector focus on banking, healthcare, manufacturing, media, retail, travel,…
Financial Health
StrongStrong · Growing, Hiring · 17% CAGR over 4y
Location
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Computed from 3 filingsProvides IT infrastructure and digital transformation services, including network design and management, collaboration and unified communications systems, and smart building technology integration…
Serves healthcare providers, education institutions and enterprise organisations across sectors and sizes, including NHS trusts and teams responsible for digital infrastructure, workplace technology…
Financial Health
StrongStrong · Profitable · 28% CAGR over 1y
Location
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Computed from 5 filingsProvides managed IT services and technical support for businesses, including fully managed support, device lifecycle management, specialist IT project delivery, and fractional IT services. Also…
Serves B2B organisations needing outsourced or supplementary IT expertise, targeting internal teams that require managed support, specialist project help, security guidance, and Microsoft cloud…
Financial Health
StrongStrong · Growing, Hiring · 30% CAGR over 4y
Location
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Computed from 5 filingsProvides IT services including managed IT support, cloud infrastructure design, cybersecurity, and business connectivity. Implements and supports Microsoft 365, Azure, Dynamics and Sage systems, and…
Serves businesses and charities, including construction, distribution, manufacturing, warehousing, retail, SaaS, commercial property and other service-sector organisations.
Financial Health
StrongStrong · Growing, Hiring · 86% CAGR over 4y
Location
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Computed from 4 filingsProvides IT consultancy and managed services focused on Microsoft technologies. Designs, implements and supports cloud solutions including Microsoft 365, Azure and Power Platform, along with managed…
Serves businesses of all sizes seeking Microsoft cloud, security and managed IT support, including organisations adopting M365, Azure, Power Platform and Teams.
Financial Health
StrongStrong · Growing, Hiring · 10% CAGR over 4y
Location
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Computed from 5 filingsProvides managed IT services for businesses and education organisations, including IT support, cyber security, cloud solutions, IT consultancy, and VoIP telephony systems. Also assists with Cyber…
Serves businesses and educational organisations across the South East of England, including clients with workplace IT, cyber security, cloud and communications requirements, and public sector buyers…
Financial Health
StrongStrong · Growing, Hiring · 26% CAGR over 4y
Location
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Computed from 3 filingsProvides third‑party support and managed services for enterprise software including Oracle, SAP and VMware. Services include issue resolution, security updates, database and infrastructure health…
Serves B2B organisations of all sizes running Oracle, SAP and VMware enterprise software, targeting IT, ERP, database and infrastructure teams across mid-sized businesses and large global enterprises.
Financial Health
HealthyHealthy · Hiring · 20% CAGR over 2y
Location
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Computed from 5 filingsProvides IT consulting, systems implementation, outsourcing and managed support services, including ERP and CRM platforms, e‑commerce systems, cloud migration, data analytics, automation, and…
Serves enterprises and public sector organisations in retail, consumer goods, healthcare, life sciences, banking, financial services, insurance and telecoms seeking technology-led transformation.
Financial Health
StableStable · Hiring · 100% CAGR over 4y
Location
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Computed from 4 filingsProvides IT and digital technology services including application development, systems integration, application management, testing and support. Also delivers cloud, data analytics, AI, cybersecurity…
Serves large enterprises on a B2B basis, particularly major organisations in banking, capital markets, media, energy, healthcare, insurance, life sciences, manufacturing, retail, travel and…
Financial Health
StrongStrong · 38% CAGR over 2y
Location
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Computed from 5 filingsProvides IT infrastructure and support services for SAP environments, including cloud hosting, colocation, on‑premise systems and hardware‑as‑a‑service. Delivers SAP HANA server implementation,…
Serves businesses running SAP ERP or SAP Business One, especially IT and operations teams responsible for SAP HANA infrastructure, cloud hosting, colocation, data security and managed support across…
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 4y
Location
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Computed from 5 filingsProvides managed IT services including technical support, IT consultancy, cyber security, network infrastructure management and business software support. Works with organisations to maintain and…
Serves UK businesses needing managed IT support, with particular experience in legal firms, education organisations, sports clubs and other mid-sized to larger organisations with complex IT…
Financial Health
StrongStrong · -1% CAGR over 4y
Location
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Computed from 3 filingsProvides implementation, consultancy, support and private cloud hosting for Sage business software, including Sage Intacct, Sage 200 and Sage X3. Offers ERP deployment, system migration, and guidance…
Serves UK businesses using or evaluating Sage ERP and finance systems, including mid-market finance and operations teams, manufacturers, distributors, PE-backed companies, and organisations migrating…
Financial Health
StrongStrong · Hiring · 7% CAGR over 2y
Location
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Computed from 5 filingsProvides IT services including cloud computing, cybersecurity, enterprise networking, business connectivity, virtual desktop infrastructure and managed IT support. Also develops and delivers…
Serves businesses and organisations of all sizes across the UK and Europe, including teams responsible for IT, security, cloud infrastructure, connectivity and digital transformation.
Financial Health
StrongStrong · Growing, Hiring · 46% CAGR over 4y
Location
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Computed from 5 filingsProvides managed IT support and technology services for businesses, including network infrastructure management, cybersecurity, email security, internet connectivity, VoIP telephony, disaster…
Serves businesses and organisations across the South West and wider UK, particularly in legal, financial, leisure and tourism, healthcare, manufacturing, and food and drink sectors.
Financial Health
StrongStrong · Growing, Hiring · 16% CAGR over 4y
Location
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Computed from 5 filingsProvides managed technology services including IT support, managed print services, cybersecurity, cloud and digital transformation solutions, and unified communications. Supports and maintains…
Sells to businesses of all sizes needing managed IT, print, security, communications and digital transformation support, and also serves Scottish public sector organisations through…
Financial Health
StrongStrong · Growing, Hiring · 9% CAGR over 5y
Location
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Computed from 5 filingsProvides managed IT services, outsourced IT support and cybersecurity for businesses, including Microsoft 365 and cloud migration. Implements and supports ERP systems such as Microsoft Business…
Targets B2B organisations across the North and Midlands, including manufacturers, law firms, charities and accountancy practices, typically business leaders and operations/IT teams.
Financial Health
HealthyHealthy · Growing, Hiring · 5% CAGR over 4y
Location
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Computed from 5 filingsProvides managed IT services including technical support, cloud infrastructure management, cybersecurity, and IT strategy. Supports organisations with system monitoring, helpdesk services, and…
Serves modern businesses and organisations seeking managed IT, cloud and cybersecurity support, with emphasis on London and UK customers and additional clients in New Zealand and Australia.
Financial Health
HealthyHealthy · Growing · 1% CAGR over 5y
Location
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Computed from 3 filingsProvides IT consulting and engineering services including network and communications architecture, infrastructure design and implementation, data analytics platforms such as Splunk, automation, and…
Serves UK defence, government and wider public sector IT teams, plus private sector organisations operating in regulated environments that need specialist network, communications, data and…
Financial Health
HealthyHealthy · Hiring · 23% CAGR over 2y
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Computed from 3 filingsProvides managed IT support and cybersecurity services for businesses and schools, including help desk and on‑site support, network and infrastructure management, cloud and Microsoft services,…
Serves businesses across the UK and schools in Cornwall and Devon, targeting organisations that need outsourced IT support, cybersecurity and infrastructure services.
Financial Health
StrongStrong · Growing, Hiring · 24% CAGR over 2y
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Computed from 4 filingsProvides managed IT support and consultancy for businesses, including network and server management, Microsoft 365 services, cloud migration and hosting, cybersecurity services, backup and disaster…
Serves Manchester-area businesses, from SMEs to larger organisations, including accounting firms, law firms, professional services, insurance, financial institutions, retail, manufacturing,…
Financial Health
StrongStrong · Growing, Hiring · 9% CAGR over 3y
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Computed from 5 filingsProvides managed IT services for businesses, including helpdesk support, IT infrastructure maintenance, cybersecurity and risk management, cloud solutions, disaster recovery, and IT strategy…
Serves businesses and organisations across Northern Ireland and Ireland, targeting teams that need outsourced IT support, IT strategy, cyber security, cloud, continuity, and workplace collaboration…
Financial Health
StrongStrong · Growing, Hiring · 16% CAGR over 4y
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Computed from 5 filingsProvides consulting, implementation and managed support for Oracle Cloud and Oracle E‑Business Suite systems. Services include cloud infrastructure engineering, DevOps, test automation, process…
Targets B2B organisations that use Oracle Cloud, E-Business Suite or Oracle ERP systems, including enterprise IT, finance and operations teams responsible for Oracle investments and transformation…
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
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Computed from 4 filingsProvides digital transformation consulting, implementation and support for Microsoft business software including Dynamics 365, Business Central and NAV. Develops sector‑specific ERP extensions and…
Serves B2B organisations from SMEs to enterprises, especially in distribution, manufacturing, professional services and retail, targeting C-suite and operational leaders across finance, sales, IT, HR…
Financial Health
HealthyHealthy · -3% CAGR over 3y
Location
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Computed from 3 filingsProvides IT consultancy and managed services including implementation and support of SAP Business One and Microsoft Dynamics 365 Business Central ERP systems, cloud hosting, infrastructure…
Serves B2B organisations needing ERP, cloud and managed IT support, with emphasis on manufacturing, wholesale and distribution firms, plus businesses running mission-critical IBM Power or Microsoft…
Financial Health
HealthyHealthy · Profitable · -17% CAGR over 2y
Location
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Computed from 5 filingsProvides IT consulting and managed services including IT strategy, cloud consulting and migration, infrastructure upgrades, cybersecurity monitoring, disaster recovery, and cloud voice systems, as…
Serves UK businesses needing external IT support, cloud migration, infrastructure, communications and cyber security guidance, including organisations planning technology change or seeking ongoing…
Financial Health
HealthyHealthy · -8% CAGR over 4y
Location
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Computed from 5 filingsProvides information technology consultancy and managed services focused on data protection and cyber resilience, including backup and recovery solutions, cloud data protection, ransomware recovery…
Serves businesses and organisations with critical data, targeting IT, security and compliance teams that need backup, cyber recovery, cloud/SaaS protection and audit readiness.
Financial Health
StrongStrong · Growing, Hiring · 10% CAGR over 4y
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Computed from 5 filingsProvides managed IT services including technical support, network and cloud infrastructure management, cybersecurity, IT strategy consulting, business telephony, software development, and staff IT…
Serves businesses in Aberdeen and across Scotland that need outsourced IT support and managed technology services, including teams seeking help with infrastructure, cyber security, cloud,…
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 4y
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Computed from 5 filingsProvides SAP consulting and implementation services, including deployment and configuration of SAP software, migration to SAP S/4HANA, cloud adoption through RISE and GROW with SAP, and ongoing…
Sells to UK and Ireland organisations that are new to SAP or already use SAP, targeting business leaders and IT teams managing enterprise systems and digital transformation programmes.
Financial Health
HealthyHealthy · Hiring · 56% CAGR over 4y
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Computed from 5 filingsProvides outsourced IT support and software development services, including Proclaim case management development and support, web and .NET application development, network infrastructure management,…
Serves UK SMEs and large multi-site organisations needing outsourced IT, including legal businesses and teams using Proclaim case management systems.
Financial Health
StrongStrong · Growing, Hiring · 6% CAGR over 4y
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Financial sub-scores
Computed from 3 filingsProvides managed IT support and infrastructure services including network management, server installation and support, disaster recovery planning, and annual support contracts for businesses and…
Serves SMEs, schools and charities across North West England, including accountancy, construction, consulting, engineering, manufacturing, recruitment and legal firms needing ongoing business IT…
Financial Health
StrongStrong · Growing, Hiring · 8% CAGR over 2y
Location
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Computed from 5 filingsProvides managed IT services and cybersecurity for businesses, including IT helpdesk support, network infrastructure management, cloud hosting, Microsoft 365 support, disaster recovery, vulnerability…
Serves businesses needing outsourced IT and cyber security support, especially legal firms, accountancy practices, energy companies, warehouse and logistics operators, and estate agents in Doncaster,…
Financial Health
HealthyHealthy · Hiring · 20% CAGR over 4y
Location
Unlock all 1,864 leads
Showing 50 of 1,864 — +1,814 more with verified decision-maker contacts, live data, and CRM sync.
Unlock all 1,864 leads
Showing 50 of 1,864 — +1,814 more with verified decision-maker contacts, live data, and CRM sync.
How Google Tag Manager 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. IT services 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 IT services 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.
Google Tag Manager 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
How many UK IT services companies use Google Tag Manager?
What share of UK IT services companies run Google Tag Manager?
How is Google Tag Manager usage detected?
What size IT services companies use Google Tag Manager in the UK?
What do Google Tag Manager-running IT services companies also run?
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