# 100 leading Advertising Services companies in the world

Tamtam tracks 7,500 Advertising Services companies worldwide. This list ranks the 100 largest by number of employees on LinkedIn, led by WPP, Publicis Groupe and VML. Their median headcount is 5,382. The most common headquarters are New York (24), London (19) and Paris (4).

This list features large advertising services companies from around the world. These firms specialize in creative transformation, digital business transformation, media solutions, and brand experience. They include WPP, a creative transformation company, and Publicis Groupe, which helps clients transform their marketing and digital businesses. Other notable companies are VML, a global creative agency, and dentsu, which helps brands predict future opportunities.

A significant number of these companies, such as WPP, Clinic, and Clear Channel Europe, are headquartered in London, indicating a concentration of major players in the advertising sector in the UK capital. New York also features prominently with companies like VML, WPP Media, and Omnicom Media.

🌍 World · 100 companies · Updated Nov 13, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [WPP](https://www.tamtam.ai/c/wpp) (wpp.com)<br>Creative transformation company uses creativity to build better futures for people, planet, clients, and communities | Advertising Services | 🇬🇧 London | 41,040 |  |
| 2 | [Publicis Groupe](https://www.tamtam.ai/c/publicis-groupe) (publicisgroupe.com)<br>Helps clients transform their marketing and digital businesses, providing expertise in communications, media, data, and technology across 100+ countries. | Advertising Services | 🇫🇷 Paris | 41,020 |  |
| 3 | [VML](https://www.tamtam.ai/c/vml) (vml.com)<br>Global creative agency combining brand experience, customer experience, and commerce with deep data and technology expertise for clients. | Advertising Services | 🇺🇸 New York | 34,192 |  |
| 4 | [WPP Media](https://www.tamtam.ai/c/wpp-media) (wppmedia.com)<br>Global media collective leveraging AI, platforms, people, and partners to create innovative solutions driving brand growth worldwide daily. | Advertising Services | 🇺🇸 New York | 28,457 |  |
| 5 | [Work From Home Jobs](https://www.tamtam.ai/c/work-from-home-jobs) (workfromhomejobs.me)<br>A platform for remote job seekers to discover various work from home job opportunities from different sources in one place | Advertising Services | 🇺🇸 Los Angeles | 19,671 |  |
| 6 | [dentsu](https://www.tamtam.ai/c/dentsu) (dentsu.com)<br>Helping brands predict future opportunities and create growth paths by connecting brand, content, commerce, and experience with creativity. | Advertising Services | 🇯🇵 Tokyo | 19,298 |  |
| 7 | [Clinic](https://www.tamtam.ai/c/clinic) (clinic.co.uk)<br>Independent creative agency crafting bold ideas to drive action and change, with a focus on people's experiences and problem-solving for brands | Advertising Services | 🇬🇧 London | 19,192 | 1983 |
| 8 | [JOB](https://www.tamtam.ai/c/job) (somosjob.ar)<br>A communication and services agency providing creative solutions to consumer goods marketing teams Expert team with offices in Argentina and Uruguay | Advertising Services | 🇦🇷 Buenos Aires | 15,492 | 1977 |
| 9 | [Clear Channel Europe](https://www.tamtam.ai/c/clear-channel-europe) (clearchanneleurope.com)<br>Leading outdoor media company across 14 markets, transforming advertising through data-driven innovations and infrastructure for brands and positive global impact. | Advertising Services | 🇬🇧 London | 15,206 |  |
| 10 | [work from anywhere](https://www.tamtam.ai/c/work-from-anywhere) (rjpjrblue.ws)<br>Online business coach and mentor specializing in affiliate marketing, with multiple online businesses including SFI and cryptocurrency mining companies Working with sister to achieve success | Advertising Services | 🇺🇸 Orlando | 13,925 | 2012 |
| 11 | [Omnicom Media](https://www.tamtam.ai/c/omnicom-media) (omnicommedia.com)<br>Designs growth ecosystems using Omni Intelligence Platform, connecting media agencies to deliver relevant consumer and client experiences globally. | Advertising Services | 🇺🇸 New York | 13,741 | 1998 |
| 12 | [BAR](https://www.tamtam.ai/c/bar) (civediamoalbar.com)<br>Custom websites for all types and sizes Whether sober, elegant, or quirky, they create unique sites tailored to match your personality | Advertising Services | 🇮🇹 Milan | 12,967 | 2019 |
| 13 | [EssenceMediacom](https://www.tamtam.ai/c/essencemediacom) (essencemediacom.com)<br>EssenceMediacom is a leading agency focused on delivering marketing breakthroughs for brands through integrated media solutions and continuous learning | Advertising Services | 🇬🇧 London | 12,000 | 2023 |
| 14 | [Fiverr and Upwork Freelancers (Buyers and Sellers)](https://www.tamtam.ai/c/fiverr-and-upwork-freelancers-buyers-and-sellers)<br>Provides social media management, Facebook and LinkedIn marketing, business lead generation, influencer promotion, digital skills endorsements, and online shop integration for global freelancers. | Advertising Services | 🇮🇳 Phalpadia | 11,661 | 2013 |
| 15 | [SHOP](https://www.tamtam.ai/c/shop) (searchfindorder.com)<br>Innovative marketplace offering a variety of trendy products including gadgets, electronics, home items, and automotive accessories for consumers seeking the latest trends | Advertising Services | 🇨🇦 Milton | 11,517 |  |
| 16 | [Epsilon](https://www.tamtam.ai/c/epsilon) (epsilon.com)<br>It provides data-driven marketing solutions, enabling brands to engage consumers effectively across various channels using advanced technology and analytics. | Advertising Services | 🇺🇸 Irving | 11,146 |  |
| 17 | [Publicis Media](https://www.tamtam.ai/c/publicis-media) (publicisgroupe.com)<br>A global media company within Publicis Groupe, employing data-driven solutions and platform-based technologies to deliver client value and drive growth internationally | Advertising Services | 🇬🇧 London | 11,033 |  |
| 18 | [Havas](https://www.tamtam.ai/c/havas) (havas.com)<br>Global communications network providing integrated, data-driven, AI-powered marketing and communication solutions through collaborative, innovative teams worldwide. | Advertising Services | 🇫🇷 Puteaux | 11,029 |  |
| 19 | [Stagwell](https://www.tamtam.ai/c/stagwell) (stagwellglobal.com)<br>A challenger holding company specializing in transforming marketing strategies and practices | Advertising Services | 🇺🇸 New York | 10,825 |  |
| 20 | [Ogilvy](https://www.tamtam.ai/c/ogilvy) (ogilvy.com)<br>A global creative agency, specializing in advertising, media, public relations, and consulting, known for crafting iconic, culture-changing ideas for clients worldwide | Advertising Services | 🇺🇸 New York | 10,731 |  |
| 21 | [TBWA\Worldwide](https://www.tamtam.ai/c/tbwa-worldwide) (tbwa.com)<br>Innovative creative collective using Disruption® methodology to build strong brands that defy convention and compete with culture globally | Advertising Services | 🇺🇸 New York | 10,386 |  |
| 22 | [Quad](https://www.tamtam.ai/c/quad) (quad.com)<br>Global marketing experience company streamlining marketing complexities with state-of-the-art technology and data-driven solutions for brands to make direct consumer connections | Advertising Services | 🇺🇸 Sussex | 10,261 | 1971 |
| 23 | [SEO](https://www.tamtam.ai/c/seo) (optimising.com.au)<br>A leading SEO agency with over 15 years of experience, offering in-house services for web development, PR, copywriting, and digital marketing | Advertising Services | 🇦🇺 Melbourne | 10,205 | 1999 |
| 24 | [Almacén](https://www.tamtam.ai/c/almacen) (elalmacen.tv)<br>An advertising agency founded in 2003, providing comprehensive communication services in traditional and digital media, BTL projects, and design for various brands | Advertising Services | 🇦🇷 Olivos | 9,273 | 2004 |
| 25 | [Other.™](https://www.tamtam.ai/c/other-toronto) (weareother.ca)<br>Specialized paid media and performance creative agency helping marketers optimize media spend, achieve targets, and outperform competition with proven methodologies and successful campaigns | Advertising Services | 🇨🇦 Toronto | 9,168 | 2015 |
| 26 | [GroupM](https://www.tamtam.ai/c/groupm) (wppmedia.com)<br>A global media investment group shaping the future of advertising to be more effective, with expertise in data, entertainment, and investment solutions | Advertising Services | 🇺🇸 New York | 9,156 | 2003 |
| 27 | [TAXI](https://www.tamtam.ai/c/taxi) (vml.com)<br>Offers world-class brand, customer, and commerce capabilities as part of VML, with offices in Montréal and New York. | Advertising Services | 🇨🇦 Montreal | 9,150 |  |
| 28 | [IPG Mediabrands](https://www.tamtam.ai/c/ipg-mediabrands) (omnicommedia.com)<br>manages global marketing investments through full-service agencies and specialty units, serving diverse industries with media and marketing solutions | Advertising Services | 🇺🇸 New York | 8,776 |  |
| 29 | [HH Global](https://www.tamtam.ai/c/hh-global) (hhglobal.com)<br>Global leader in tech-enabled creative production and procurement, partnering with clients and suppliers worldwide to deliver impactful creative solutions. | Advertising Services | 🇬🇧 London | 8,626 |  |
| 30 | [Omnicom](https://www.tamtam.ai/c/omnicom-new-york) (omc.com)<br>Global marketing communications company offering integrated marketing services for 200+ brands worldwide, known for talent, creativity, and digital innovation | Advertising Services | 🇺🇸 New York | 8,062 |  |
| 31 | [DDB](https://www.tamtam.ai/c/ddb) (tbwa.com)<br>This company prioritizes people, product, and profit in that order, fostering diverse teams to create magic in their work | Advertising Services | 🇺🇸 New York | 7,459 | 1949 |
| 32 | [Wavemaker](https://www.tamtam.ai/c/wavemaker) (wavemakerglobal.com)<br>Wavemaker specializes in Provocative Planning to drive growth by combining machine learning and human intelligence for better outcomes and consumer experiences #GrowFearless #PositiveProvocation | Advertising Services | 🇬🇧 London | 7,200 |  |
| 33 | [Leo Burnett](https://www.tamtam.ai/c/leo-burnett) (leoburnett.com)<br>Global communications agency combining creativity, data, and technology to influence human behavior and drive client prosperity worldwide. | Advertising Services | 🇺🇸 Chicago | 6,825 |  |
| 34 | [SGK](https://www.tamtam.ai/c/sgk-des-plaines) (sgkinc.com)<br>Global packaging and brand experience company delivering solutions for brands to speak louder, scale faster, and grow stronger, with 6,500 employees worldwide | Advertising Services | 🇺🇸 Des Plaines | 6,821 |  |
| 35 | [Mindshare](https://www.tamtam.ai/c/mindshare) (mindshareworld.com)<br>A media services company that accelerates enduring and sustainable business growth for clients through data and behavioral science, connecting brands with consumers | Advertising Services | 🇬🇧 London | 6,729 |  |
| 36 | [Insights](https://www.tamtam.ai/c/insights-london) (nospace.com)<br>Global leader in marketing data and analytics, providing deep insights into consumer behavior to inspire growth for clients worldwide | Advertising Services | 🇬🇧 London | 6,668 |  |
| 37 | [MERCADO](https://www.tamtam.ai/c/mercado-3118461) (agenciamercado.com)<br>Creative agency specializing in relationship marketing strategies, digital tools, and metrics to help brand owners achieve key objectives | Advertising Services | 🇵🇹 Lisbon | 6,557 | 2013 |
| 38 | [Digital Marketing](https://www.tamtam.ai/c/digital-marketing)<br>The company specializes in digital marketing services, utilizing online platforms and technologies to promote products and services through various channels | Advertising Services | 🇺🇸 Las Vegas | 6,410 |  |
| 39 | [McCann](https://www.tamtam.ai/c/mccann-new-york) (mccann.com)<br>A global leader in creativity, strategy, and brand communication, uniting diverse practices across 100+ countries to help brands connect with consumers effectively | Advertising Services | 🇺🇸 New York | 6,335 |  |
| 40 | [JCDecaux](https://www.tamtam.ai/c/jcdecaux) (jcdecaux.com)<br>Global leader in outdoor advertising, specializing in street furniture, transport advertising, and billboard displays worldwide. | Advertising Services | 🇫🇷 Neuilly-sur-Seine | 6,312 | 1964 |
| 41 | [Havas Media Network](https://www.tamtam.ai/c/havas-media-network) (havasmedianetwork.com)<br>Global media networks providing programmatic buying, data consulting, performance marketing, and social media services to connect brands with target audiences. | Advertising Services | 🇺🇸 New York | 6,053 | 1978 |
| 42 | [Salesland](https://www.tamtam.ai/c/salesland) (salesland.net)<br>A global sales specialist recruiting, training, and leading commercial teams across 13 countries, focusing on direct and indirect selling, marketing, and advertising | Advertising Services | 🇪🇸 Madrid | 5,854 | 2000 |
| 43 | [BOUTIQUE](https://www.tamtam.ai/c/boutique-leeds) (weareboutique.co.uk)<br>A fiercely independent agency focused on delivering ambitious media, digital, PR, and social solutions for clients driven by growth and results | Advertising Services | 🇬🇧 Leeds | 5,825 | 2012 |
| 44 | [Dentsu Creative](https://www.tamtam.ai/c/dentsu-creative) (dentsucreative.com)<br>Global creative agency network unlocking client growth. Uses transformative creativity for positive impact on people, business, and society. | Advertising Services | 🇺🇸 | 5,803 |  |
| 45 | [PHD](https://www.tamtam.ai/c/phd) (phdmedia.com)<br>Global media agency network combining data, technology, and human expertise to create innovative campaigns and transform brand experiences worldwide. | Advertising Services | 🇬🇧 Bankside | 5,700 | 1990 |
| 46 | [Omawo](https://www.tamtam.ai/c/omawo) (omawo.com)<br>Providing website owners quality websites, tips to increase online traffic and turnover, and insight into French affiliate marketing. | Advertising Services | 🇬🇧 Bath | 5,692 |  |
| 47 | [Starcom](https://www.tamtam.ai/c/starcom) (starcomww.com)<br>A global leader in communications planning and media, focused on putting people at the center to inspire and drive business forward through data and technology | Advertising Services | 🇺🇸 Chicago | 5,691 |  |
| 48 | [Otra](https://www.tamtam.ai/c/otra) (otra.in)<br>Connects advertisers with vehicle owners for moving ad spaces. Redefines vehicle advertising with metric attribution, traceability, and geotargeting. Provides vehicle owners secondary income. | Advertising Services | 🇮🇳 Bengaluru | 5,494 | 2017 |
| 49 | [Fiverr Freelancers (Buyer and Seller)](https://www.tamtam.ai/c/fiverr-freelancers-buyer-and-seller)<br>Professionals in social media management and marketing, offering expertise in growing and managing LinkedIn and Facebook pages, promotion, ad campaigns, and employee services | Advertising Services | 🇵🇰 Yazman | 5,409 | 2014 |
| 50 | [Zenith](https://www.tamtam.ai/c/zenith) (zenithmedia.com)<br>A global agency specializing in media, data, technology, commerce, and content to drive successful business outcomes for clients worldwide | Advertising Services | 🇬🇧 London | 5,382 |  |
| 51 | [niente](https://www.tamtam.ai/c/niente) (linkedin.com)<br>No information about company activities, services, or products available in the provided content to describe company operations. | Advertising Services | 🇮🇹 | 5,342 |  |
| 52 | [Residencia](https://www.tamtam.ai/c/residencia) (residencia.com.mx)<br>A multi-purpose agency creating digital experiences through various tools and technologies, including websites, online ads, viral campaigns, apps, videos, and interactive installations | Advertising Services | 🇲🇽 Mexico City | 5,301 | 2006 |
| 53 | [Foundry](https://www.tamtam.ai/c/foundry-san-francisco) (foundryco.com)<br>It focuses on media and martech, emphasizing relationships, consented data, and driving progress in diversity, inclusion, and tech accessibility. | Advertising Services | 🇺🇸 San Francisco | 5,292 |  |
| 54 | [Monks](https://www.tamtam.ai/c/monks) (monks.com)<br>Provides global marketing, technology services, AI-driven data science, and content production to help brands accelerate business and outpace competition. | Advertising Services | 🇬🇧 London | 5,067 | 2001 |
| 55 | [FIRMA](https://www.tamtam.ai/c/firma) (wearefirma.com)<br>A full-service Branding and Innovation agency creating successful brands by combining actionable insights, strategic thinking, and creative imagination | Advertising Services | 🇪🇸 Barcelona | 4,889 | 2006 |
| 56 | [Havas Creative Network](https://www.tamtam.ai/c/havas-creative-network) (havascreative.com)<br>Innovative global communications network offering custom solutions through a connected ecosystem of multidisciplinary teams, with access to entertainment and culture | Advertising Services | 🇺🇸 New York | 4,874 |  |
| 57 | [V4 Company](https://www.tamtam.ai/c/v4-company) (forms.v4company.com)<br>An innovative marketing advisory firm specializing in optimizing sales online through the unique V4 Method, connecting results-driven individuals with businesses seeking growth | Advertising Services | 🇧🇷 Campinas | 4,867 | 2012 |
| 58 | [Digital Marketing](https://www.tamtam.ai/c/digital-marketing-san-diego) (dmnpco.com)<br>Providing digital marketing strategies, social media marketing, SEO, and advertising services to small businesses and start-ups Consulting for online marketing analysis | Advertising Services | 🇺🇸 San Diego | 4,841 | 2010 |
| 59 | [Omnicom Precision Marketing](https://www.tamtam.ai/c/omnicom-precision-marketing) (omcpmg.com)<br>Global digital marketing group leveraging data and CRM to create targeted customer experiences at scale through technology, strategy, data, and consulting services | Advertising Services | 🇺🇸 New York | 4,799 |  |
| 60 | [Saatchi & Saatchi](https://www.tamtam.ai/c/saatchi-and-saatchi) (saatchi.com)<br>Global communications and advertising network creating impactful creative ideas that build strong emotional connections between consumers and brands worldwide. | Advertising Services | 🇬🇧 London | 4,737 | 1970 |
| 61 | [DEPT®](https://www.tamtam.ai/c/dept) (dept.global)<br>A pioneering technology and marketing services company creating global digital experiences for top brands, committed to sustainability and innovation | Advertising Services | 🇳🇱 Amsterdam | 4,701 |  |
| 62 | [Business Bytes Pakistan](https://www.tamtam.ai/c/business-bytes-pakistan) (businessbytes.pk)<br>Providing up-to-date news and insights on Pakistan's business environment, fostering innovation and industry connection for professionals. | Advertising Services | 🇵🇰 Islamabad | 4,677 |  |
| 63 | [MediaCom](https://www.tamtam.ai/c/mediacom-london) (essencemediacom.com)<br>An innovative marketing agency within EssenceMediacom GroupM, specializing in creating breakthroughs for brands Follow @EssenceMediacom for more | Advertising Services | 🇬🇧 London | 4,671 |  |
| 64 | [INDIVIDUAL](https://www.tamtam.ai/c/individual-san-francisco) (iindividual.co)<br>A talent development and personal branding studio offering personalized platforms for individuals and teams to align vision, share stories, and grow | Advertising Services | 🇺🇸 San Francisco | 4,515 | 2019 |
| 65 | [MEC](https://www.tamtam.ai/c/mec-london) (mecglobal.com)<br>It is a global media agency formed by MEC and Maxus, focusing on innovative marketing and advertising solutions for clients. | Advertising Services | 🇬🇧 London | 4,489 | 2002 |
| 66 | [SPOTPROMO](https://www.tamtam.ai/c/spotpromo) (spotpromo.com.br)<br>Agency specializing in merchandising and promotions, focused on achieving results aligned with brand strategies through impeccable execution, innovative solutions, and ethical practices | Advertising Services | 🇧🇷 São Paulo | 4,269 | 2003 |
| 67 | [Harte Hanks](https://www.tamtam.ai/c/harte-hanks) (hartehanks.com)<br>A global customer experience company specializing in personalized marketing, customer care services, and fulfillment solutions to create enduring connections | Advertising Services | 🇺🇸 Chelmsford | 4,267 | 1923 |
| 68 | [MNC](https://www.tamtam.ai/c/mnc) (mnc.co.uk)<br>This media agency goes beyond media by combining creative solutions with tailored strategies to help startups scale and established brands maintain market leadership | Advertising Services | 🇬🇧 London | 4,218 | 1997 |
| 69 | [Vendedor](https://www.tamtam.ai/c/vendedor) (instagram.com)<br>A dynamic Egyptian marketing startup offering digital services, branding, event management, media production, and web development to drive business growth internationally | Advertising Services | 🇪🇬 Cairo | 4,206 | 2021 |
| 70 | [OMD](https://www.tamtam.ai/c/omd) (omd.com)<br>Global media network driving digital growth for prestigious brands through industry-leading capabilities, recognized as most awarded, best performing, and most effective agency network globally | Advertising Services | 🇺🇸 New York | 4,140 |  |
| 71 | [Ströer SE & Co. KGaA](https://www.tamtam.ai/c/stroer-se-and-co-kgaa) (stroeer.de)<br>Leading German media house, offering outdoor advertising, digital media, dialog marketing, e-commerce, and Data as a Service solutions, reaching millions of users. | Advertising Services | 🇩🇪 Cologne | 3,924 | 1990 |
| 72 | [Jakarta](https://www.tamtam.ai/c/jakarta) (media7.net)<br>A dedicated marketing agency in Jakarta, specializing in helping local businesses navigate digital marketing with simplified strategies and cost-effective solutions | Advertising Services | 🇮🇩 Jakarta | 3,921 |  |
| 73 | [Criteo](https://www.tamtam.ai/c/criteo) (bit.ly)<br>Provides a global commerce intelligence platform that drives performance for brands, agencies, retailers, and publishers using proprietary data and AI innovation. | Advertising Services | 🇫🇷 Paris | 3,918 |  |
| 74 | [Ximim](https://www.tamtam.ai/c/ximim) (ximim.com)<br>Award-winning international digital marketing services company providing solutions to help businesses grow and succeed online | Advertising Services | 🇺🇸 Eltopia | 3,894 | 2001 |
| 75 | [OLIVER \| The Brandtech Group](https://www.tamtam.ai/c/oliver-the-brandtech-group) (oliverinside.ai)<br>Design and operate bespoke in-house agencies and ecosystems for brands, driving business growth and innovative marketing solutions globally. | Advertising Services | 🇬🇧 London | 3,870 | 2009 |
| 76 | [dentsu Japan](https://www.tamtam.ai/c/dentsu-japan) (dentsu.co.jp)<br>A network of over 160 group companies in Japan offering services in advertising, business, customer experience, and digital transformations to support client growth | Advertising Services | 🇯🇵 Tokyo | 3,855 |  |
| 77 | [Publicis Re:Sources](https://www.tamtam.ai/c/publicis-re-sources) (publicisresources.com)<br>Provides technology solutions and business services including finance, accounting, legal, and procurement for agencies, enabling innovation and client transformation. | Advertising Services | 🇫🇷 Paris | 3,796 |  |
| 78 | [Google AdSense](https://www.tamtam.ai/c/google-adsense) (google.com)<br>A program that enables publishers to display targeted ads on their websites to generate revenue based on clicks or impressions | Advertising Services | 🇺🇸 Mountain View | 3,775 | 2003 |
| 79 | [Lamar Advertising Company](https://www.tamtam.ai/c/lamar-advertising-company) (lamar.com)<br>Offers various outdoor advertising formats, including billboards, transit, and airport displays, to help businesses reach broad audiences across the United States and Canada. | Advertising Services | 🇺🇸 Baton Rouge | 3,761 | 1902 |
| 80 | [Acxiom](https://www.tamtam.ai/c/acxiom) (acxiom.info)<br>Connected data and identity foundation unifying and preparing information for AI-driven marketing and decision-making through privacy-first ethics and global governance strategies. | Advertising Services | 🇺🇸 Conway | 3,607 | 1969 |
| 81 | [Government of Karnataka Project](https://www.tamtam.ai/c/government-of-karnataka-project) (digitalvaastu.com)<br>The company operates in Karnataka, India, providing governance and legislative services with a parliamentary system of government in place | Advertising Services | 🇮🇳 Bengaluru | 3,547 | 2015 |
| 82 | [WPP Production](https://www.tamtam.ai/c/wpp-production) (wppproduction.com)<br>Global content production company integrating creative producers, AI, and virtual production to deliver innovative, fast, and scalable marketing content solutions. | Advertising Services | 🇬🇧 London | 3,507 |  |
| 83 | [TikTok for Business](https://www.tamtam.ai/c/tiktok-for-business) (ads.tiktok.com)<br>A global platform offering creative solutions for brands to engage with the TikTok community through full-screen video formats | Advertising Services | 🇺🇸 New York | 3,414 |  |
| 84 | [Local Authority](https://www.tamtam.ai/c/local-authority) (localauthority.org)<br>A company providing a comprehensive local ranking report by analyzing Google My Business listings for agencies to improve local marketing campaigns | Advertising Services | 🇺🇸 St Petersburg | 3,413 |  |
| 85 | [Spark Foundry](https://www.tamtam.ai/c/spark-foundry) (sparkfoundryww.com)<br>A global media agency under Publicis Media, combining innovation with industry talent to deliver award-winning campaigns worldwide | Advertising Services | 🇺🇸 New York | 3,284 |  |
| 86 | [Hogarth](https://www.tamtam.ai/c/hogarth) (wppproduction.com)<br>Creative production company combining craft, insight, and technology to bring creative work to life across global locations. | Advertising Services | 🇬🇧 London | 3,262 | 2008 |
| 87 | [Publicis](https://www.tamtam.ai/c/publicis) (publicisna.com)<br>Full-service advertising agency, helping clients lead digital transformation. Global network, strategic, creative, and digital ideas for brand leadership and public consciousness. | Advertising Services | 🇺🇸 New York | 3,237 |  |
| 88 | [JK - Agency](https://www.tamtam.ai/c/jk-agency) (jkgroupe.com)<br>Strategic communication & engagement firm specializing in designing social experiences to create innovative ideas and build impactful projects | Advertising Services | 🇫🇷 Paris | 3,135 | 2012 |
| 89 | [MRM](https://www.tamtam.ai/c/mrm-new-york) (mrm.com)<br>Builds enduring brand relationships, grows customer lifetime value through CRM, CX, commerce, and MarTech, all backed by data and analytics. | Advertising Services | 🇺🇸 New York | 3,127 | 1982 |
| 90 | [SGS & Co](https://www.tamtam.ai/c/sgs-and-co) (sgsco.com)<br>Global brand impact group driving success for world class clients through innovation, design, production, and technology to shift brands to impact | Advertising Services | 🇺🇸 Louisville | 3,126 | 1946 |
| 91 | [Initiative](https://www.tamtam.ai/c/initiative) (initiative.com)<br>Initiative is a media agency that helps ambitious brands grow by creating Fame and Flow through strategic media planning and responsible practices | Advertising Services | 🇺🇸 New York | 3,126 | 1970 |
| 92 | [Horizon Media](https://www.tamtam.ai/c/horizon-media) (horizonmedia.com)<br>Provides innovative media planning and buying services, focusing on business outcomes, diversity, and a strong client-centric culture. | Advertising Services | 🇺🇸 New York | 3,105 | 1989 |
| 93 | [Cheil Worldwide](https://www.tamtam.ai/c/cheil-worldwide) (cheil.com)<br>A global agency specializing in performance-driven marketing, connecting creativity, data, tech, and retail to enhance business performance and consumer brand experience | Advertising Services | 🇰🇷 Seoul | 3,067 | 1973 |
| 94 | [Mother](https://www.tamtam.ai/c/mother) (motherfamily.com)<br>A globally respected, independent creative agency with offices worldwide, specializing in creating culturally impactful ideas for a diverse range of clients | Advertising Services | 🇬🇧 London | 3,065 | 1996 |
| 95 | [Spectrum Reach](https://www.tamtam.ai/c/spectrum-reach) (spectrumreach.com)<br>The company is a trusted media sales company with 3,000 employees in 100 offices across 36 states, providing advertising solutions to businesses | Advertising Services | 🇺🇸 New York | 3,055 |  |
| 96 | [تسويق الكتروني](https://www.tamtam.ai/c/company-dubai) (smartcodeit.com)<br>A professional team offering digital marketing services, website design and development, graphic design, video production, presentations, targeted marketing, and social media management | Advertising Services | 🇦🇪 Dubai | 3,053 |  |
| 97 | [KINESSO](https://www.tamtam.ai/c/kinesso) (acxiom.com)<br>Technology-driven performance marketing agency providing actionable growth through optimization, analytics, AI, and experimentation capabilities across data, social platforms, commerce, and curated marketplaces. | Advertising Services | 🇺🇸 New York | 2,987 |  |
| 98 | [Grey](https://www.tamtam.ai/c/grey) (grey.com)<br>Creative marketing agency delivering effective ideas and growth solutions for global brands through innovative advertising and business problem-solving strategies. | Advertising Services | 🇺🇸 New York | 2,957 | 1917 |
| 99 | [Mosaic North America](https://www.tamtam.ai/c/mosaic-north-america) (mosaic.com)<br>An integrated marketing agency in North America, creating connected brand experiences using data-led insights, expertise in various areas, and a 30-year history | Advertising Services | 🇨🇦 Toronto | 2,946 |  |
| 100 | [Solocal](https://www.tamtam.ai/c/solocal-boulogne-billancourt) (solocal.com)<br>Providing digital solutions to businesses in France through Search Local and Digital Marketing services, focusing on local content, personalized marketing, and growth acceleration | Advertising Services | 🇫🇷 Boulogne-Billancourt | 2,935 |  |

## 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 Nov 13, 2026.

## More company lists in the world

- [The largest companies in the world](https://www.tamtam.ai/l/largest-companies-in-the-world) (415,089)
- [Multinational companies in the world](https://www.tamtam.ai/l/multinational-companies-in-the-world) (74,905)
- [Manufacturers in the world](https://www.tamtam.ai/l/manufacturers-in-the-world) (39,566)
- [Retail chains in the world](https://www.tamtam.ai/l/retail-chains-in-the-world) (35,498)
- [Companies with in-house R&D in the world](https://www.tamtam.ai/l/r-and-d-companies-in-the-world) (34,334)
- [Financial services firms in the world](https://www.tamtam.ai/l/financial-services-firms-in-the-world) (26,817)
- [Professional services firms in the world](https://www.tamtam.ai/l/professional-services-firms-in-the-world) (24,737)
- [Education providers in the world](https://www.tamtam.ai/l/education-companies-in-the-world) (23,937)
- [IT Services and IT Consulting companies in the world](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-in-the-world) (23,571)
- [Critical infrastructure operators in the world](https://www.tamtam.ai/l/critical-infrastructure-operators-in-the-world) (23,312)
- [SaaS companies in the world](https://www.tamtam.ai/l/saas-companies-in-the-world) (22,459)
- [IT services companies in the world](https://www.tamtam.ai/l/it-services-companies-in-the-world) (20,934)
- [Software Development companies in the world](https://www.tamtam.ai/l/software-development-companies-in-the-world) (20,534)
- [Hardware manufacturers in the world](https://www.tamtam.ai/l/hardware-companies-in-the-world) (20,150)
- [Financial Services companies in the world](https://www.tamtam.ai/l/financial-services-companies-in-the-world) (19,958)
- [Companies with a mobile app in the world](https://www.tamtam.ai/l/companies-with-mobile-app-in-the-world) (18,922)
- [Public sector organisations in the world](https://www.tamtam.ai/l/public-sector-organisations-in-the-world) (18,492)
- [Healthcare providers in the world](https://www.tamtam.ai/l/healthcare-providers-in-the-world) (16,037)
- [Consulting firms in the world](https://www.tamtam.ai/l/consulting-firms-in-the-world) (16,009)
- [Family-owned companies in the world](https://www.tamtam.ai/l/family-owned-companies-in-the-world) (14,667)
- [Distributors and wholesalers in the world](https://www.tamtam.ai/l/distributors-and-wholesalers-in-the-world) (13,470)
- [Hospitals and Health Care companies in the world](https://www.tamtam.ai/l/hospitals-and-health-care-companies-in-the-world) (12,916)
- [Corporate groups and holding companies in the world](https://www.tamtam.ai/l/holding-companies-in-the-world) (12,862)
- [E-commerce companies in the world](https://www.tamtam.ai/l/ecommerce-companies-in-the-world) (12,013)

## The same list elsewhere

- [Advertising Services companies in Europe](https://www.tamtam.ai/l/advertising-services-companies-in-europe) (4,447)
- [Advertising Services companies in France](https://www.tamtam.ai/l/advertising-services-companies-france) (2,358)
- [Advertising Services companies in North America](https://www.tamtam.ai/l/advertising-services-companies-in-north-america) (2,165)
- [Advertising Services companies in the United States](https://www.tamtam.ai/l/advertising-services-companies-united-states) (1,940)
- [Advertising Services companies in the United Kingdom](https://www.tamtam.ai/l/advertising-services-companies-united-kingdom) (952)
- [Advertising Services companies in Asia](https://www.tamtam.ai/l/advertising-services-companies-in-asia) (359)
- [Advertising Services companies in Latin America](https://www.tamtam.ai/l/advertising-services-companies-in-latin-america) (298)
- [Advertising Services companies in Belgium](https://www.tamtam.ai/l/advertising-services-companies-belgium) (222)
- [Advertising Services companies in India](https://www.tamtam.ai/l/advertising-services-companies-india) (211)
- [Advertising Services companies in Canada](https://www.tamtam.ai/l/advertising-services-companies-canada) (182)
- [Advertising Services companies in Germany](https://www.tamtam.ai/l/advertising-services-companies-germany) (178)
- [Advertising Services companies in Brazil](https://www.tamtam.ai/l/advertising-services-companies-brazil) (162)
- [Advertising Services companies in Switzerland](https://www.tamtam.ai/l/advertising-services-companies-switzerland) (154)
- [Advertising Services companies in Spain](https://www.tamtam.ai/l/advertising-services-companies-spain) (138)
- [Advertising Services companies in Africa](https://www.tamtam.ai/l/advertising-services-companies-in-africa) (114)
- [Advertising Services companies in the Netherlands](https://www.tamtam.ai/l/advertising-services-companies-netherlands) (105)
- [Advertising Services companies in Italy](https://www.tamtam.ai/l/advertising-services-companies-italy) (95)
- [Advertising Services companies in Australia](https://www.tamtam.ai/l/advertising-services-companies-australia) (76)
- [Advertising Services companies in the Middle East](https://www.tamtam.ai/l/advertising-services-companies-in-the-middle-east) (74)
- [Advertising Services companies in Poland](https://www.tamtam.ai/l/advertising-services-companies-poland) (48)
- [Advertising Services companies in Mexico](https://www.tamtam.ai/l/advertising-services-companies-mexico) (43)
- [Advertising Services companies in Turkey](https://www.tamtam.ai/l/advertising-services-companies-turkey) (35)
- [Advertising Services companies in Egypt](https://www.tamtam.ai/l/advertising-services-companies-egypt) (30)
- [Advertising Services companies in Indonesia](https://www.tamtam.ai/l/advertising-services-companies-indonesia) (29)

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Source: https://www.tamtam.ai/l/advertising-services-companies-in-the-world