| # | Company | Employees |
|---|---|---|
| 1 | 41,040 | |
| 2 |
Clinicclinic.co.uk
Independent creative agency crafting bold ideas to drive action and change, with a focus on people's experiences and problem-solving for brands |
19,192 |
| 3 |
Clear Channel Europeclearchanneleurope.com
Leading outdoor media company across 14 markets, transforming advertising through data-driven innovations and infrastructure for brands and positive global impact. |
15,206 |
| 4 |
EssenceMediacomessencemediacom.com
EssenceMediacom is a leading agency focused on delivering marketing breakthroughs for brands through integrated media solutions and continuous learning |
12,000 |
| 5 |
Publicis Mediapublicisgroupe.com
A global media company within Publicis Groupe, employing data-driven solutions and platform-based technologies to deliver client value and drive growth internationally |
11,033 |
| 6 |
HH Globalhhglobal.com
Global leader in tech-enabled creative production and procurement, partnering with clients and suppliers worldwide to deliver impactful creative solutions. |
8,626 |
| 7 |
Wavemakerwavemakerglobal.com
Wavemaker specializes in Provocative Planning to drive growth by combining machine learning and human intelligence for better outcomes and consumer experiences #GrowFearless #PositiveProvocation |
7,200 |
| 8 |
Mindsharemindshareworld.com
A media services company that accelerates enduring and sustainable business growth for clients through data and behavioral science, connecting brands with consumers |
6,729 |
| 9 |
Insightsnospace.com
Global leader in marketing data and analytics, providing deep insights into consumer behavior to inspire growth for clients worldwide |
6,668 |
| 10 |
BOUTIQUEweareboutique.co.uk
A fiercely independent agency focused on delivering ambitious media, digital, PR, and social solutions for clients driven by growth and results |
5,825 |
| 11 |
PHDphdmedia.com
Global media agency network combining data, technology, and human expertise to create innovative campaigns and transform brand experiences worldwide. |
5,700 |
| 12 | 5,692 | |
| 13 |
Zenithzenithmedia.com
A global agency specializing in media, data, technology, commerce, and content to drive successful business outcomes for clients worldwide |
5,382 |
| 14 | 5,067 | |
| 15 |
Saatchi & Saatchisaatchi.com
Global communications and advertising network creating impactful creative ideas that build strong emotional connections between consumers and brands worldwide. |
4,737 |
| 16 |
MediaComessencemediacom.com
An innovative marketing agency within EssenceMediacom GroupM, specializing in creating breakthroughs for brands Follow @EssenceMediacom for more |
4,671 |
| 17 |
MECmecglobal.com
It is a global media agency formed by MEC and Maxus, focusing on innovative marketing and advertising solutions for clients. |
4,489 |
| 18 | 4,218 | |
| 19 |
OLIVER | The Brandtech Groupoliverinside.ai
Design and operate bespoke in-house agencies and ecosystems for brands, driving business growth and innovative marketing solutions globally. |
3,870 |
| 20 |
WPP Productionwppproduction.com
Global content production company integrating creative producers, AI, and virtual production to deliver innovative, fast, and scalable marketing content solutions. |
3,507 |
| 21 |
Hogarthwppproduction.com
Creative production company combining craft, insight, and technology to bring creative work to life across global locations. |
3,262 |
| 22 |
Mothermotherfamily.com
A globally respected, independent creative agency with offices worldwide, specializing in creating culturally impactful ideas for a diverse range of clients |
3,065 |
| 23 |
Advantage Smollanadvantagesmollan.com
Local experts providing consistent service and strong client relationships, leveraging global insights, innovation, and technology for growth. |
2,706 |
| 24 | 2,389 | |
| 25 | 2,373 | |
| 26 |
Iris Londoniris-worldwide.com
The Participation Agency helps brands grow using creativity, data-driven media, and people to create cultural moments and connect with audiences worldwide |
2,365 |
| 27 |
iProspectiprospect.com
Global digital-first media agency specializing in media strategy, digital expertise, and audience knowledge to drive performance-driven brand building for iconic brands worldwide |
2,325 |
| 28 |
Social Mediasocial-media.co.uk
Results-driven online marketing agency specializing in SEO, SMM, PPC, and BRM solutions for clients in various industries Focus on monitoring, maximizing effectiveness, and brand image |
2,319 |
| 29 |
Jellyfishjellyfish.com
A marketing performance company specializing in navigating and connecting platforms to drive growth for global brands through tech, media, creativity, and data expertise |
2,259 |
| 30 |
Marketizonmarketizon.com
Innovative multi-channel marketing technologies leader dedicated to creating effective campaigns, transforming users into followers, and achieving business goals through digital marketing strategies |
2,123 |
| 31 |
Cubacuba-london.co.uk
Integrated marketing agency specializing in creating campaigns based on insights to drive sales for clients through advertising, direct, digital, film, branding, and repro services |
2,073 |
| 32 |
Young Professionalsyoung-professionals.uk
This company connects schools and colleges with companies to help place school leavers into apprenticeships and work experience programs with top brands |
2,029 |
| 33 |
MiQwearemiq.com
Programmatic media partnership leveraging agnostic buying platforms, audience intelligence, and TV data to deliver high-performance advertising campaigns for various brands and agencies. |
1,965 |
| 34 |
Omnicom Media UKomnicommediagroup.com
Connects diverse media agencies using a marketing orchestration system to provide relevant consumer experiences and inclusive environments through award winning strategic planning. |
1,963 |
| 35 |
We Are Socialwearesocial.com
A global creative agency specializing in social media, crafting ideas that resonate with online communities to reach targeted audiences effectively |
1,926 |
| 36 |
Librarylibrary-agency.com
A creative agency based in Brighton, specializing in working with food, drink, and lifestyle brands that are purpose-driven Certified B Corp |
1,842 |
| 37 |
GPL CONSULTING UK LTD
The company provides a wide range of consultancy services in management, defense, law enforcement, IT, along with web development, telecommunication, software solutions, and international trade |
1,679 |
| 38 | 1,593 | |
| 39 |
Kitchenkitchensoho.com
A team of creative individuals who develop brand-focused ideas in-house through research, planning, design, and more for impactful results |
1,559 |
| 40 |
APS Grouptheapsgroup.com
A global marketing and communications company founded in 1961, focusing on empowering brands through creativity, content creation, and production expertise |
1,479 |
| 41 |
Tour and Travelagency.org.uk
Discover top-rated tour operators and travel companies in the UK and USA through customer reviews to find the perfect one for your trip |
1,447 |
| 42 |
TCCwearetcc.co.uk
Creative agency specializing in branding and strategy since 1985, offering tailored solutions for brand challenges through identity, campaigns, and strategic thinking |
1,441 |
| 43 |
Yellsmartrecruiters.com
A leading UK provider of digital marketing services connecting businesses and customers with free and paid profiles, websites, and advertising solutions |
1,438 |
| 44 |
Paragon UKparagon.world
Providing data-driven, multichannel marketing, transactional communications, and automated workflows to digitize and enhance customer communication journeys securely and compliantly. |
1,411 |
| 45 |
Influencerinfluencer.com
Global agency delivering creator-first solutions through proprietary technology and platform partnerships to drive measurable brand impact, humanize businesses, and connect with audiences. |
1,346 |
| 46 |
adm Indiciaadm-indicia.com
Create and activate meaningful brand experiences that drive ROI by connecting with audiences throughout the customer journey effectively. |
1,334 |
| 47 |
M+C Saatchi Groupmcsaatchi.com
Global creative network combining creativity, data, and technology to build brands, solve business challenges, and create cultural impact. |
1,189 |
| 48 |
Anything is Possibleaip.media
An integrated, independent agency specializing in Media, Tech, and Creative services We offer transformative marketing solutions through close relationships with clients |
1,184 |
| 49 |
Design Bridge and Partnersdesignbridge.com
Creative company specializing in brand strategy, identity, communications, and management, serving iconic global brands and innovative startups worldwide. |
1,151 |
| 50 |
T&Ptandpgroup.com
A full-service independent agency network partnering with WPP & GroupM, combining diverse talent to transform brand building with innovation & creativity |
1,114 |
| 51 | 1,098 | |
| 52 |
TLC Worldwidetlc-worldwide.com
This company has been offering free experiences to clients' customers for 30 years, connecting them with thousands of rewarding activities and services globally |
1,093 |
| 53 |
LOCALiQ_UKlocaliq.co.uk
Trusted local news provider offering digital marketing services to help businesses reach new customers, backed by extensive experience and data |
1,085 |
| 54 |
Creative Agency
A London-based Digital Marketing Agency offering services in Paid Search, SEO, Programmatic, Affiliate, and Social Media marketing for small to medium-sized businesses |
1,066 |
| 55 |
Uber Agencyuberagency.com
Creative advertising agency focused on brand development, offering communication services with a straightforward approach Recognized by industry publications and recommended agency |
1,022 |
| 56 |
1973 Ltd1973ltd.com
An experienced marketing agency specializing in email and automation, delivering bespoke solutions for companies of all sizes with certified experts |
1,008 |
| 57 |
Isobardentsucreative.com
Global creative agency focusing on strategy, innovation, product/experience, brand design, and communications/content Award-winning work for top clients in brand and experience design |
943 |
| 58 | 941 | |
| 59 |
Oxfordagency.org.uk
Innovative recruitment agency in Oxford helps individuals find and apply for the latest job opportunities to kickstart new careers |
938 |
| 60 |
dentsu Xdxglobal.com
An innovative agency blending creativity, media, and technology to create memorable experiences through problem-solving and collaboration, with a focus on people |
915 |
| 61 |
M+C Saatchi UKmcsaatchi.com
An independent creative agency specializing in simplifying complex categories and businesses through Brutal Simplicity of Thought |
904 |
| 62 |
Weichert
A real estate network offering services such as buying, selling, renting, and property management |
892 |
| 63 |
Sushithesushiagency.co.uk
Global digital marketing agency passionate about creative solutions for social media, websites, and more Experienced team serving diverse clients worldwide |
879 |
| 64 |
Marketing Campaigns
The company offers inspiration to marketers by showcasing the most creative campaigns worldwide |
878 |
| 65 | 872 | |
| 66 |
Instagram for my Business
A platform designed for businesses to promote their products and services through visual content, similar to Instagram but catered specifically for business uses |
785 |
| 67 |
adm Groupadmgroup.com
Creation and activation of meaningful brand experiences driving ROI by connecting with audiences throughout the customer journey effectively. |
777 |
| 68 |
The Millthemill.com
Expert creative partner providing visual effects, design, and end-to-end production for commercials, branded films, digital campaigns, and interactive experiences across various global media platforms. |
754 |
| 69 |
Incubetaincubeta.com
A global team of 800+ experts across 20 offices offering digital services to unlock business growth for clients like Google, Hyundai, and Netflix |
750 |
| 70 | 726 | |
| 71 |
Netpeaknetpeak.us
This performance marketing agency focuses on promoting businesses, attracting customers, and increasing sales through various services including SEO, PPC, and creative content |
715 |
| 72 | 705 | |
| 73 |
InnerWorkingshhglobal.com
Global marketing execution provider offering cost-effective solutions through technology, expertise, and innovation for physical marketing procurement and content development |
701 |
| 74 | 690 | |
| 75 |
Fiverr Gig Promotion USAfiverr.com
This company specializes in social media and digital marketing services, including Facebook and LinkedIn promotion, influencer marketing, and business lead generation |
671 |
| 76 |
Ebiquity plcebiquity.com
Global media experts providing evidence-based consultancy, analyzing massive advertising spends to improve return on investment and ensure responsible, effective digital governance. |
666 |
| 77 | 659 | |
| 78 |
Digitas UKdigitas.com
Creative data and technology services for B2C and B2B brands focused on end to end customer experience strategy and modern growth. |
655 |
| 79 |
BBH Globalbartleboglehegarty.com
A creative agency that believes in the power of difference to create impactful advertising and enhance the overall brand experience for global clients |
648 |
| 80 |
IMAima.global
IMA-HOME is a fully integrated agency with 400 specialists worldwide, creating brands for real people and partnering with top companies like adidas and Reebok |
645 |
| 81 |
Any Other Nameanyother.name
A London-based creative studio and brand consultancy, specializing in creating visual narratives for campaigns, identities, and experiences to influence culture |
642 |
| 82 |
CIM | The Chartered Institute of Marketingcim.co.uk
The company promotes and supports professional marketing, offering training courses and qualifications to help marketers thrive and uphold ethical practices worldwide |
636 |
| 83 | 625 | |
| 84 |
Miroma Groupmiromagroup.com
Global independent marketing business driving growth for disruptive brands through award-winning agencies and unique investment models for seed and Series A funding |
595 |
| 85 |
Currently looking for a new opportunitymikeleys.com
Specializing in growth marketing for start-ups in online, SaaS, and apps, with expertise in customer acquisition, retention, and monetization strategies |
587 |
| 86 | 584 | |
| 87 |
AMV BBDOamvbbdo.com
A creative agency with a strong track record of award-winning campaigns, driving competitive advantage for clients through the power of creativity |
581 |
| 88 |
MullenLowe Globalmullenloweglobal.com
Creative communications network with global offices, focused on innovation, adaptability, and helping brands grow through integrated marketing strategies. |
574 |
| 89 |
Landorlandor.com
A global leader in brand consulting and design, offering services such as strategy, design, research, innovation, and interactive media to top brands worldwide |
567 |
| 90 |
Manchesterdigitalmarketingconference.org
Organizes digital marketing conferences in Manchester, offering industry insights, networking opportunities, and expert speakers for professionals seeking to level up their skills |
561 |
| 91 |
BBH Londonbartleboglehegarty.com
This company believes in the power of difference to shape impactful advertising and creative brand experiences worldwide |
554 |
| 92 |
Select Model Managementselectmodel.com
A leading model and talent agency with global reach, founded in London in 1977 and known for scouting unique talent worldwide |
544 |
| 93 |
Student Beans (now Pion)wearepion.com
Connects verified students with global brands through secure verification technology, offering discounts and tools to support Gen Z consumer habits. |
543 |
| 94 | 530 | |
| 95 |
My Companygoogle.com
Specializing in innovative solutions for business challenges, leveraging cutting-edge technology to drive growth and efficiency in various industries |
523 |
| 96 |
Elementaryelementary-agency.com
An independent marketing and e-commerce agency specializing in leisure, entertainment, hospitality, travel, and tourism sectors, focusing on enhancing businesses' commercial strategies through tailored services |
516 |
| 97 |
Appco UKappcogroup.co.uk
Expert in field marketing and fundraising campaigns, delivering high-quality client acquisition services through innovative, people-driven approach, investing in staff development and sustainable growth |
505 |
| 98 |
TMWtmwunlimited.com
An integrated creative agency that creates ideas to move people, combining emotion, motivation, connectivity, and expertise for modern marketing success |
504 |
| 99 |
Greenparkgreenpark.digital
Creates omnichannel search and social content using AI tech to connect global brands with consumers through integrated digital performance content squads worldwide. |
498 |
| 100 |
DMSdmsukltd.com
A vibrant, talent-driven agency offering full-service creative digital solutions for global media and entertainment brands to create, manage, distribute, and evaluate content |
494 |
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Oct 10, 2026.
More company lists in the United Kingdom
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- Hospitality companies in the United Kingdom 999
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- Non-profit Organizations companies in the United Kingdom 490
- Staffing and Recruiting companies in the United Kingdom 464
- Technology, Information and Internet companies in the United Kingdom 440
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