1. WPP plc:
    • Market Cap: Approximately £12 billion (British Pounds)
    • Revenue: Over £12 billion (Fiscal Year 2020)
    • Description: One of the largest advertising and marketing services groups globally, providing various advertising and communication services.
    • Global Locations: Headquarters in London, UK, with operations worldwide.
  2. Omnicom Group Inc.:
    • Market Cap: Approximately $17 billion
    • Revenue: Over $12 billion (Fiscal Year 2020)
    • Description: A leading global advertising, marketing, and corporate communications company.
    • Global Locations: Headquarters in New York City, USA, with operations worldwide.
  3. Publicis Groupe SA:
    • Market Cap: Approximately €10 billion (Euros)
    • Revenue: Over €9.7 billion (Fiscal Year 2020)
    • Description: A major communications and advertising conglomerate, offering a wide range of advertising and marketing services.
    • Global Locations: Headquarters in Paris, France, with operations worldwide.
  4. Interpublic Group of Companies, Inc. (IPG):
    • Market Cap: Approximately $14 billion
    • Revenue: Over $9.6 billion (Fiscal Year 2020)
    • Description: A global advertising and marketing solutions provider with various subsidiary agencies.
    • Global Locations: Headquarters in New York City, USA, with operations worldwide.
  5. Dentsu Group Inc.:
    • Market Cap: Approximately ¥2.1 trillion (Japanese Yen)
    • Revenue: Over ¥900 billion (Fiscal Year 2020)
    • Description: A Japanese multinational advertising and communication company with a global presence.
    • Global Locations: Headquarters in Tokyo, Japan, with operations worldwide.
  6. Omnicom Media Group:
    • Description: A division of Omnicom Group that specializes in media planning and buying services for clients worldwide.
    • Global Locations: Operates in various countries, with its parent company headquartered in the USA.
  7. Havas Group:
    • Description: A global advertising and communications company providing creative, media, and digital marketing services.
    • Global Locations: Headquarters in Puteaux, France, with operations worldwide.
  8. MDC Partners Inc.:
    • Description: A marketing and communications network with various agencies specializing in different aspects of advertising and marketing.
    • Global Locations: Headquarters in New York City, USA, with operations worldwide.
  9. Hakuhodo DY Holdings Inc.:
    • Description: A Japanese advertising and marketing company with diverse services across media and communication.
    • Global Locations: Headquarters in Tokyo, Japan, with operations worldwide.
  10. Asatsu-DK Inc. (ADK):
    • Description: A Japanese advertising agency with a focus on creative and strategic advertising solutions.
    • Global Locations: Headquarters in Tokyo, Japan, with operations primarily in Asia.