The 10 Largest Advertising Agencies In The World

In 2026, the presence of advertising in our lives is more pronounced than ever. From social media feeds to billboards, streaming services, and even augmented reality experiences, ads are omnipresent. This saturation raises the question: who is behind the creation of these engaging advertisements? The answer lies predominantly with advertising agencies.

Advertising agencies are specialized firms that plan, create, and manage advertising and marketing strategies for a variety of clients—ranging from businesses and corporations to non-profits and individuals. As consumer preferences and technology evolve, so too does the landscape of advertising, and these agencies play a pivotal role in shaping market trends and strategies.

The advertising industry has demonstrated remarkable resilience and growth over the years, driven by both traditional media and the rapid expansion of digital platforms. In this article, we will explore the top ten advertising agencies dominating the global market.

About the 10 Largest Advertising Companies

1. WPP plc

   2025 Revenue: $19.2 billion
   Headquarters: London, UK

   WPP plc, headquartered in London, is the world’s largest advertising company and ranks first on our list. As a multinational holding company, it operates across communications, public relations, technology, commerce, and advertising.

   After overtaking Omnicom Group in 2008, WPP has maintained its title as the largest advertising group globally. The company is listed on the New York Stock Exchange and boasts a wide array of subsidiaries, including Ogilvy, Grey, and Mindshare.

   Founded in 1971, WPP employs over 130,000 people and offers services that encompass advertising, brand consulting, data insights, and production.

2. Omnicom Group

   2025 Revenue: $15.2 billion
   Headquarters: New York, USA

   Omnicom Group Inc. is the second-largest advertising company worldwide, well-known for its innovative approach to marketing and communications. Headquartered in New York City, it operates in over 100 countries.

   Founded in 1986, Omnicom oversees several prestigious networks, including BBDO and DDB, providing a broad range of services from digital marketing to public relations.

   The company employs over 80,000 people and continues to be a leader in creative advertising solutions.

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3. Publicis Groupe

   2025 Revenue: $14.0 billion
   Headquarters: Paris, France

   Publicis Groupe, the largest advertising company in France, holds the third position on our list. This multinational agency offers a wide array of services, including traditional and digital advertising.

   Founded in 1926, Publicis has made significant strides in the advertising landscape, operating in over 100 countries and employing thousands of professionals worldwide.

   The company is recognized for its innovative campaigns and commitment to redefining brand experiences.

4. The Interpublic Group of Companies

   Revenue: $11.5 billion
   Headquarters: New York, USA

   The Interpublic Group of Companies, Inc. (IPG) ranks fourth on our list. Founded in 1930, this New York-based agency has evolved significantly over the decades and now employs over 54,000 individuals.

   With a focus on strategic marketing and advertising, IPG encompasses several major networks, including McCann and FCB, and continues to innovate its approach to client services.

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5. Dentsu

   2025 Revenue: $9.0 billion
   Headquarters: Tokyo, Japan

   Dentsu is the largest advertising agency in Japan and ranks fifth on our list. Established in 1901, Dentsu has a long history in the advertising industry and operates in 145 countries.

   The agency provides a comprehensive suite of services, including digital marketing, media planning, and content creation.

   Dentsu continues to lead the way in integrating traditional advertising with innovative digital solutions.

6. Dentsu Aegis Network

   2025 Revenue: $8.0 billion
   Headquarters: London, UK

   Dentsu Aegis Network, a subsidiary of Dentsu, specializes in digital marketing and media services. Since its merger with Aegis in 2013, it has expanded its global footprint.

   The company operates with ten key divisions, focusing on communication strategy, media planning, and market research, and employs approximately 35,000 people globally.

7. Hakuhodo

   2025 Revenue: $7.1 billion
   Headquarters: Tokyo, Japan

   Hakuhodo is Japan’s oldest major advertising agency, founded in 1895. Despite being outside the “Big Five,” it ranks seventh on our list due to its significant contributions to advertising and public relations.

   The agency operates in 17 countries and has built a diverse portfolio of clients, emphasizing branding and consumer insights.

8. Havas

   2025 Revenue: $4.0 billion
   Headquarters: Paris, France

   Havas operates globally, focusing on creative solutions across its three main divisions: Havas Creative, Havas Media, and Havas Health. Founded in 1968, Havas is well-known for its innovative marketing strategies.

   The company has over 20,000 employees and collaborates with leading brands across various industries.

9. MDC Partners

   2025 Revenue: $1.50 billion
   Headquarters: New York, USA

   MDC Partners is a relatively newer player in the advertising space, founded in 1980. Operating with a unique partnership model, MDC emphasizes creative and digital marketing.

   The company employs about 5,600 people and continues to invest in creative firms while expanding its international presence.

10. Publicis Sapient

    2025 Revenue: $1.50 billion
    Headquarters: Massachusetts, USA

    Publicis Sapient, founded in 1990, specializes in digital transformation and marketing. It has become a global leader in helping brands navigate the complexities of the modern digital landscape.

    With over 20,000 employees, the agency remains committed to delivering innovative solutions to its clients.

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Advertising FAQ

1. Where are the largest advertising companies?

   The largest advertising companies are primarily located in the US, UK, France, and Japan. Our list reflects a concentration of agencies in major cities, where cultural trends and consumer insights converge.

2. How big is the advertising industry?

   The global advertising industry is valued at $766 billion. The U.S. accounts for approximately 34% of this market, significantly outpacing other regions.

   

3. What industries do the most advertising?

   The Retail industry is the largest spender on advertising, with $35.48 billion in 2021. Other leading sectors include Financial Services, Consumer Products, and Technology.

   

4. How many ads does a person see in a day?

   The average American encounters 6,000-10,000 ads daily. This number has increased significantly due to the rise of digital media and social platforms, highlighting the pervasive nature of advertising in modern life.

How We Ranked the Top 10

In ranking the top ten largest advertising agencies, we defined “largest” by annual revenue rather than employee count or subsidiary networks. This revenue-based approach offers a clearer picture of each agency’s market influence and success.

Data on revenue was sourced from reliable industry reports and financial analyses. Rankings are based on the most recent fiscal data available, ensuring an accurate representation of the current advertising landscape.

The companies listed are primarily extensive agency networks that manage a variety of smaller agencies and specialized firms.

Author

Lilly Chesser

Lilia Chesser is a professional copywriter and content writer based in Columbus, Ohio. She graduated from Denison University with a BA in communications.