Marketing Agency Companies Using Google Tag Manager in the UK: 2,089 Active Firms (2026)
Marketing agencies running tag-management scripts coordinate campaign tracking, consent-aware analytics and conversion measurement for UK clients.
For marketing agencies, tag management sits between media buying, web development and analytics implementation, letting teams deploy campaign pixels, event tags and consent rules without a full release cycle for every client site. Adoption usually signals an agency with recurring performance-marketing work, access to client web properties and enough technical capability to govern changes rather than passing each tracking request to an external developer. Engagements are usually retainer-led campaign or analytics work for business clients, with the buying centre split between performance, analytics and web teams, and account managers translating client objectives into measurement plans and maintenance tickets.
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2,089 active UK marketing agencies are running the profiled tag-management technology. Reported headcount totals 3,737 employees, which points to an adoption base that includes many small agencies as well as employers with dedicated media, web and analytics teams. Within marketing-agency tag-manager detections, the profiled system accounts for 100.0% of the cohort, while another tag-management platform appears at 0.2%. The registered-region skew is London-heavy at 28.2%, followed by the South East at 16.2%, the North West at 10.0%, the South West at 9.8% and the East of England at 8.7%.
Agency campaigns do not sit under a sector licence, but tracking and optimisation work touches several UK regimes. The ICO governs data protection and PECR, so consent language, cookie behaviour and direct-marketing permissions matter before campaign performance can be interpreted. Ofcom can become relevant where communications networks are misused, while the CMA and trading standards cover unfair-trading issues. Advertising claims sit with the ASA and the CAP Code, including campaigns where the agency executes creative or media on a client's behalf. The practical market structure is therefore not licensing-led; it is a mix of client procurement checks, consent records, tag audits and evidence that campaign claims can be substantiated.
Adoption appears likely to remain tied to how agencies package measurement work rather than to the tag container itself. Agencies with recurring paid-media retainers tend to need tighter governance over consent changes, conversion events and client reporting, while smaller creative shops may keep implementation more ad hoc. Browser privacy changes and platform-side measurement limits should push more work into server-side routing, audit trails and periodic clean-up of older tags. The vendor landscape also appears prone to bundling, with analytics, consent-management and customer-data tools pulling adjacent tasks into the same workflow. For agencies, that favours maintenance capability and defensible measurement process over installation-only work.
Adoption by company size
Adoption of Google Tag Manager rises with company size across the trading UK marketing agency companies in this cohort. 2.4% of the 54,246 companies with under 10 employees run Google Tag Manager (1,295 detected). 38.5% of the 1,903 companies with 10–50 employees run Google Tag Manager (733 detected). 43.8% of the 146 companies with over 50 employees run Google Tag Manager (64 detected). That is a 41.4% gap between the over 50 employees and under 10 employees bands.
2,089
Active firms
2026
100%
Of detected Tag managers share
UK marketing agency
7
Median headcount
Filed accounts
4,219
Verified contacts
Across this cohort
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Key facts
About 4% of the trading cohort reports turnover above £5M (87 of 2,089 firms) — the rest sits below that revenue band.
5% of the cohort was incorporated since 2022 (114 firms), so a sizeable share is in its first few filing cycles.
Within marketing agencies with a detectable tag-management system, this tag manager accounts for 100.0% (2,089), while another system appears on 0.2% (4) of the 2,090-company category base.
The stack is website-led: 64.1% (1,339) also run a common content-management platform, 54.2% (1,133) use an edge/security layer and 39.6% (828) show web analytics.
London accounts for 28.2% (589) of marketing agencies running this tag manager, followed by the South East at 16.2% (339) and the North West at 10.0% (209).
UK ad spend reached £42.6 billion in 2024, up 10.4%, with online formats growing 13.2% and £4 in every £5 of budgets spent online.
Campaigns sit across ICO data-protection and PECR rules, ASA CAP Code requirements, Ofcom network-misuse powers, and CMA or trading-standards enforcement where unfair-trading rules apply.
Tag manager market share among UK Marketing Agency
Share of the 2,090 UK Marketing Agency with a detectable system. As of June 2026.
What else do Google Tag Manager-running Marketing Agency run?
Share of the 2,089 Google Tag Manager-running UK companies where each technology was also detected. As of June 2026.
Where Google Tag Manager Marketing Agency 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
£480.7K
Median UK turnover
4.2%
Above £5M turnover
114
Incorporated since 2022
4,219 verified decision-maker contacts
across these 2,089 companies, with emails available in Firmbase. Filter by role, seniority and stack.
Top UK Marketing Agency 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.
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StrongStrong · Growing, Hiring · 8% CAGR over 4y
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Computed from 4 filingsProvides digital marketing services including search engine optimisation, pay‑per‑click advertising, paid social media campaigns, and conversion rate optimisation. Also offers digital marketing…
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HealthyHealthy · -7% CAGR over 3y
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HealthyHealthy · Hiring · 22% CAGR over 2y
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Computed from 5 filingsProvides digital marketing services including search engine optimisation, AI search strategy, pay‑per‑click advertising, content marketing, email automation, analytics, conversion rate optimisation,…
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HealthyHealthy · Hiring · 15% CAGR over 4y
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Computed from 5 filingsProvides brand strategy, creative design, and digital marketing services. Develops advertising campaigns, content, and visual assets, and builds websites and digital systems, alongside performance…
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HealthyHealthy · Hiring · 7% CAGR over 4y
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HealthyHealthy · Hiring · 38% CAGR over 1y
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Financial Health
StrongStrong · Growing, Hiring · 17% CAGR over 3y
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Financial Health
StrongStrong · Growing, Hiring · 30% CAGR over 4y
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Financial Health
StrongStrong · Growing, Hiring · 50% CAGR over 4y
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Financial Health
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Financial Health
StableStable · -66% CAGR over 4y
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Computed from 3 filingsProvides digital marketing services for retailers and brands, including paid search advertising, search engine optimisation, and affiliate marketing. Develops and operates ecommerce marketing…
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StrongStrong · Growing, Hiring · 8% CAGR over 2y
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StrongStrong · Growing, Hiring · 25% CAGR over 5y
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Financial Health
StableStable · 10% CAGR over 1y
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Computed from 5 filingsProvides digital marketing and design services including search engine optimisation, paid search and social media advertising, web development, ecommerce website design, branding, and conversion rate…
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Financial Health
StrongStrong · Growing, Hiring · 14% CAGR over 4y
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Computed from 5 filingsProvides digital marketing services including SEO, paid media, paid social, digital PR, content and outreach, and customer experience optimisation. Uses behavioural science insights to plan…
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Financial Health
HealthyHealthy · Hiring · 12% CAGR over 4y
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Computed from 5 filingsProvides media planning and buying across online and offline channels, including search engine optimisation, paid and organic search strategy, data analytics, and content strategy. Develops…
Serves brands and marketing teams, particularly in property and travel, including developers, shared ownership providers, airlines and other consumer-facing organisations.
Financial Health
HealthyHealthy · Hiring · 29% CAGR over 4y
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Computed from 5 filingsProvides media planning and media buying services for brands, developing advertising strategies, audience targeting and cross‑channel campaign plans. Uses data insights and performance measurement to…
Serves growth-focused brands and marketing teams, including organisations with commercial objectives that need media agency support, audience targeting and global campaign reach.
Financial Health
HealthyHealthy · Growing, Hiring · 2% CAGR over 5y
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Computed from 5 filingsProvides ecommerce consultancy and digital services including Shopify store development and migration, ecommerce marketing, SEO, CRM and email campaigns, branding, UX design, and custom web…
Serves high-growth UK retail and ecommerce brands, particularly Shopify and Shopify Plus merchants seeking support across online store growth, migration, marketing, branding and development.
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StrongStrong · Growing, Hiring · 18% CAGR over 4y
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Computed from 5 filingsProvides performance-focused digital marketing services using data analysis to plan and manage online advertising campaigns. Works with clients in live entertainment, sport, theatre, fashion and…
Serves B2B clients in live entertainment, sport, theatre, fashion, lifestyle and e-commerce, including brands, event organisers and venue or ticketing teams.
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HealthyHealthy · -48% CAGR over 4y
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Computed from 5 filingsProvides digital marketing services including search engine optimisation, pay‑per‑click advertising management, paid social and display advertising, content marketing, digital PR, social media…
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HealthyHealthy · -4% CAGR over 4y
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Computed from 3 filingsProvides performance marketing services for ecommerce brands, including paid social and paid search strategy, ad optimisation, creative analytics and content production. Uses an in-house AI platform…
Serves ecommerce and retail brands, especially fashion and consumer brands, including fast-growing US brands expanding into Europe and in-house marketing teams seeking paid social/search growth.
Financial Health
StrongStrong · -1% CAGR over 2y
Location
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Computed from 5 filingsProvides digital marketing and technology services, including digital strategy, UX design, web development, SEO, analytics, social media management and content creation. Uses customer and first‑party…
Serves marketing and digital teams at ambitious organisations in travel, hospitality, lifestyle, luxury, arts and culture, including brands, venues and property/living operators.
Financial Health
HealthyHealthy · -63% CAGR over 4y
Location
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Computed from 4 filingsProvides digital marketing services including search engine optimisation (SEO), paid media management, content marketing, digital PR, and website design and development. Also offers data analysis,…
Serves businesses seeking digital marketing support, including ecommerce, retail, insurance and IT services brands with website-led sales and marketing teams.
Financial Health
HealthyHealthy · Hiring · 5% CAGR over 3y
Location
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Showing 50 of 2,089 — +2,039 more with verified decision-maker contacts, live data, and CRM sync.
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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. marketing agency 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 marketing agency 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 marketing agency companies use Google Tag Manager?
What share of UK marketing agency companies run Google Tag Manager?
How is Google Tag Manager usage detected?
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