This time, we have chosen to delve deeper into the history of the five leading digital advertising agencies worldwide. Their accounts, campaigns, and specialists have contributed, in one way or another, to shaping the history of social networks and advertising across the globe.
Omnicom, which until recently was the third largest advertising agency in the world, completed in November 2025 the official acquisition of Interpublic Group (IPG), which was previously sixth on this list. The new company, which retains the Omnicom name and will be traded under the symbol OMC on the New York Stock Exchange, is now the largest advertising agency in the world. In doing so, it surpasses WPP in business volume, repeating its previous growth strategy, since Omnicom itself was also formed by the merger of two advertising agencies.
These were BBDO and DDB. Realizing the growing strength of their biggest competitor, WPP, they merged to create Omnicom in 1986 in New York City. At that time, they also integrated the agency TBWA, which has worked with highly renowned brands such as Nike, McDonald’s, Pfizer, and even Correos in Spain.
In 2021, they established the Communications Consultancy Network (CCN), formed by Omnicom Public Relations Group, which includes agencies such as FleishmanHillard, Ketchum, Marina Maher Communications, and Porter Novelli, among others. These are now joined by those previously belonging to Interpublic: FCB, IPG, Mediabrands, McCann Worldgroup, and MullenLowe Group.
In addition, DAS Group of Companies is a division of Omnicom and a global group of marketing services companies consisting of: Health Group, Precision Marketing Group, Commerce Group, and Advertising Collective.
Ver esta publicación en Instagram Una publicación compartida de Omnicom (@omnicom)
Una publicación compartida de Omnicom (@omnicom)
Interestingly, WPP did not begin as an advertising agency, but rather as a majority stake in a small British manufacturer of wire baskets and teapots called Wire and Plastic Products, which was acquired by Martin Sorrell. Years later, he renamed the company WPP and began building an international group of advertising and marketing services. WPP was founded in 1971 in London, United Kingdom.
Since its creation, it has been acquiring other major advertising companies in the sector to expand its operations, after having established its main headquarters in the United Kingdom. Today, it is made up of companies such as AKQA, BCW, CMI Media Group, Choreograph, Essence, FGS Global, GREY, GroupM, Hill+Knowlton Strategies, Hogarth, Kantar, Landor and Fitch, MediaCom, Mindshare, Ogilvy, Superunion, VMLY&R, Wavemaker, WPP Government & Public Sector Practice, Wunderman Thompson, and Xaxis.
Some of these agencies have crafted the best advertising campaigns of the year.
Until the merger of Omnicom and Interpublic, it had been considered the largest advertising company in the world, with approximately 114,000 employees distributed across 3,000 offices in more than 100 countries.
This is an agency that has witnessed the evolution of advertising over the decades. Its popularity intensified just three years after its founding in 1926, quickly securing a large client base, a success that was largely due to the fact that they were pioneers in the use of radio as an advertising medium.
After the Second World War, the advertising agency had to start almost from scratch, as it had been forced to cease operations. By 1957, it was the first French agency to expand internationally, and in the 1970s it became the largest in all of Europe.
Today, it stands as one of the most important agencies worldwide. Additionally, the advertising agency has an extensive portfolio of clients, including André Shoes, Banania, Max Factor, Monsavon, Rivoire et Carret, Maison du Blanc, Grosfillex, Renault, Whirlpool, SFR, L’Oréal, Boursin, and Nescafé. It has over 16,000 employees in 110 countries.
This company originated as a division of Arthur Andersen, dedicated to business and technology consulting, but in August 2000 the two parted ways and the company became known as Accenture. It was founded in 1950 in Dublin.
In this case, their strengths have been in the areas of consulting (management consulting), operations (business process outsourcing, IT, application development and maintenance), digital and technology (technological expertise), and strategy (action plan design, digital transformation, and corporate strategy).
The company has achieved several success stories, including cases involving Avianca, Radisson, and Seat. Today, they serve over 9,000 clients worldwide. However, it should be noted that Accenture does not solely focus on advertising; it is also engaged in other industries such as healthcare, energy, software, and more.
This Japanese company specializes in advertising and public relations at an international level and serves 11,000 clients in 145 countries. It was founded by Mitsunaga Hoshirō under the name Nihon Kōkoku, and later merged with Japan Telegraphic Communication to create advertising and communications operations. It was established in 1901.
In 1946, they acquired 16 companies in order to expand operations into Osaka, Nagoya, and Kyūshū. Subsequently, in 1955, the company’s name became Dentsū. In 2011, they formed a partnership with Facebook, and in 2018, they were selected to market the rights for the Copa América 2019 to be held in Brazil.
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