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Top Advertising Companies in the UK

188 of 497 advertising companies ranked on evidence in the Q4 2026 edition.

We list 23 advertising companies in the UK. The order comes from what each firm publishes and what has been verified about it, never from payment — at the top right now: Hydrant, CRISP and KAT Marketing.

Before you shortlist, check

Campaigns they ran for businesses your size, with results you can verify
How media is bought, and whether they take commission or rebates on it
Who owns the creative, and for how long you can use it
The reporting you will get, and from whose systems

TrustList ranking

Q4 2026 edition

188 of 497 advertising companies ranked on evidence held on 9 October 2026: client reviews, vetting, awards and facts each business states on its own website, which we read and date. Nobody pays to be placed.

Positions are fixed for the quarter; the next edition is due in January 2027.

How this is ranked About this edition

All advertising companies 188 ranked SMEs 187 ranked

The SME ranking on this page lists 473 small and medium-sized agencies, and 101 of them earned a rank number. One business known to be large is left out, and the SME order does not reward age. See the SME ranking

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Also listed, not yet ranked. We hold nothing checkable on these yet that ranks them here: no client review, vetting, award, expert review, or fact stated on their own website (and on a place ranking, where they are based). They follow in order of their TrustList Score. How TrustList ranks · Get vetted, free
I Design Websites
Consumer Products & Services · Arts, Entertainment & Music · Information Technology · Also in Dundee
I Design Websites offers web development, design and hosting for businesses that want an online presence.
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On record: Based in Dundee, Scotland
i3MEDIA
Advertising & Marketing · Information Technology · Digital Marketing
i3MEDIA is a full-service web and marketing agency based in Peterborough.
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On record: Based in Peterborough, UK
ib3 Limited
Consumer Products & Services · Business Services · Information Technology
ib3 Limited is a design and marketing agency in Tonbridge, Kent. Its designers, web developers and digital specialists work on projects for new and existing clients.
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On record: Based in Tonbridge, Kent, UK
Icecream Digital
Consumer Products & Services · Advertising & Marketing · Business Services
Icecream Digital is a creative digital agency based in Manchester.
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On record: Based in Manchester, UK
ICM Creative Communications Limited
Supply Chain, Logistics, and Transport · Energy & Natural Resources · Hospitality & Leisure
ICM Creative Communications Limited is a graphic design agency in Leeds. Its stated mission is to make things happen for clients in the UK and abroad.
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On record: Based in Leeds, UK
Ideas Engine
Advertising · Production
Ideas Engine is a network of agencies and specialists, mainly based in London, that produces creative and digital work.
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On record: Based in London, England
Ident
Creative · Also in Wales
Ident Creative Ltd, known as Ident, is a multi-service studio in Liverpool that develops web application software.
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On record: Based in Liverpool, England
IfLooksCouldKill Ltd
Advertising & Marketing · Business Services · Information Technology · Also in Oxford and Scotland
IfLooksCouldKill Ltd is an independent, family-run branding and digital design studio in the heart of Edinburgh.
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On record: Based in Edinburgh, Scotland · Family-run
IGNIFI
Advertising & Marketing · Business Services · Information Technology
IGNIFI is a creative digital agency based in Sunderland, England, that works only in healthcare.
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On record: Based in Sunderland, UK
Ignition
Ignition is an independent creative advertising agency with offices in Los Angeles and London.
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On record: Based in Los Angeles, United States, with a second office in London, United Kingdom
ikon
Business Services · Real Estate · Creative · Also in London
ikon Boutique Branding & Creative Agency is a small London agency that works on brand strategy, identity, print and websites.
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On record: Based in London, UK · Boutique
Imperial Leisure
Consumer Products & Services · Arts, Entertainment & Music · Advertising & Marketing · Also in South East Asia and Asia
Imperial Leisure is a creative agency for social media, founded in London with offices in London and Singapore.
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On record: Based in London, UK, with a Singapore office
Improve Marketing
Suffolk marketing agency using a flexible network of specialists to deliver strategy, branding, advertising and digital campaigns across the UK
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On record: Based in Suffolk, England
Independent Events
Consumer Products & Services · Advertising & Marketing · Hospitality & Leisure · Also in Newcastle and Manchester
Independent Events is an experiential marketing agency that creates live, real-world brand experiences.
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On record: Based in offices in Manchester and Newcastle, UK
iNeedSocial
iNeedSocial is a digital marketing agency serving London and the surrounding areas.
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On record: Based in London, United Kingdom
Innovative Web Specialists-IWS
Innovative Web Specialists-IWS is a web design and development agency based in London. It builds websites for startups, large corporations, artists and individuals.
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On record: Based in London, United Kingdom
Insight Track Ltd
Insight Track Ltd is a market research and marketing consultancy based in Norwich, Norfolk.
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On record: Based in Norwich, Norfolk, United Kingdom
IM
Institution Marketing & Advertising
Web Design · Digital Marketing · Web Development
Institution Marketing & Advertising is a marketing agency that mixes traditional advertising thinking with data and technology.
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InSync Creative
InSync Creative is a design agency based in Hertfordshire, with offices in Welwyn and Cambridge.
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On record: Based in Welwyn, Hertfordshire, UK
Interactive Red
Consumer Products & Services · Hospitality & Leisure · Information Technology
Interactive Red is a digital agency in Kent, England, whose material appears under the Kayo Digital brand.
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On record: Based in near Sittingbourne, Kent, UK
Intermarketing Agency
Consumer Products & Services · Hospitality & Leisure · Social Media Marketing
Intermarketing Agency, known as IMA, is a creative agency that links brands with shoppers through advertising, media, packaging and in-store activity.
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On record: Based in United Kingdom, with staff in Leeds
iris worldwide
Social Media Marketing · Web Design · Digital Marketing
Iris is a global creative agency that calls itself an integrated micro-network.
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isobel Advertising
Creative · Gaming · Property
isobel Advertising is an independent London agency that mixes brand consultancy with creative campaign work.
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On record: Based in London
IT Pie
Creative · SEO · CRM
IT Pie is a web design and software development agency in Cardiff.
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On record: Based in Cardiff, Wales

For vendors

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The order is earned on evidence: client reviews, vetting, awards and the facts a business states on its own website, which we read and date. Nobody can pay to move up. Add reviews or verified facts to your free profile to move up at the next edition; there are two ways to stand out now, and each one says what it is.

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A Sponsored card above the ranked list, up to three per ranking
Marked Sponsored, and it never changes the order
Booked by the month; cancel any time

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How is this ranking worked out?

The order comes from what each firm publishes and what has been verified about it, and never from payment:

Profile completeness: the details a buyer needs to judge a firm — what it does, who it serves, how it prices, who it has worked for
Earned trust: verification, awards and the other checks a firm has actually passed
Client reviews, where they exist: the rating is smoothed, so one five-star review cannot outrank a firm with a hundred good ones, and volume counts with diminishing returns

Client reviews are still rare across this catalogue, so on most lists today the order is set by the first two. A firm near the top is the best-documented and best-verified one we hold, which is not the same claim as the best one to hire. Use the list to build a shortlist, then check the firms yourself.

Sponsored listings are labelled and shown apart from this list. How rankings work

Only firms whose profile names the UK are counted here, so a firm that lists a town but no country is not yet included.

Where else can I look?

The same list elsewhere: India (92) · Canada (41) · Australia (28).

Every category in the UK: the UK country page.

Top B2B companies in the UK38 categories ranked, 2,075 companies

Same subject

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Every other way we rank advertising companies, by what they do and where they are.

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Everything here links back to the same verified catalogue. Pick your next stop.

Top Advertising Companies in the UK

I Design Websites

i3MEDIA

ib3 Limited

Icecream Digital

ICM Creative Communications Limited

Ideas Engine

Ident

IfLooksCouldKill Ltd

IGNIFI

Ignition

ikon

Imperial Leisure

Improve Marketing

Independent Events

iNeedSocial

Innovative Web Specialists-IWS

Insight Track Ltd

Institution Marketing & Advertising

InSync Creative

Interactive Red

Intermarketing Agency

iris worldwide

isobel Advertising

IT Pie

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How is this ranking worked out?

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