What are the big six marketing agencies?

The “Big Six” marketing agencies, as of early 2025, are:

  1. WPP
  2. Omnicom Group
  3. Publicis Groupe
  4. Dentsu
  5. Interpublic Group (IPG)
  6. Havas

These agencies dominate the global advertising and marketing landscape, offering comprehensive services across various industries and marketing channels14.However, it’s important to note that Omnicom’s acquisition of Interpublic Group (IPG) was announced in late 2024, which is set to change the landscape. Once this merger is completed, the “Big Six” will become the “Big Five”4:

  1. WPP
  2. Publicis Groupe
  3. Dentsu
  4. Havas
  5. The merged Omnicom-IPG entity

This consolidation is expected to have significant impacts on the industry, potentially leading to talent shifts and new opportunities for independent agencies34.