The merger of Omnicom Group Inc. and The Interpublic Group of Companies, Inc., two advertising and marketing heavyweights, is set to combine highly complementary marketing platform capabilities and talent. The $13.5 billion all stock acquisition will create the world’s largest advertising company, surpassing the current largest player WPP in size. The combined company will retain the Omnicom name and have a market valuation of around $30 billion.

In December 2024, Omnicom and Interpublic entered into a merger agreement. Upon completion of the merger, Interpublic will become a subsidiary of Omnicom. The merger is expected to close in the second half of 2025. Upon consummation of the merger, Interpublic shareholders will receive 0.344 new Omnicom shares for each Interpublic share owned. The current CEO of Omnicom, John Wren, will continue as CEO of the combined company.

Omnicom is the parent company is a number of top advertising agencies, including TBWA, BBDO, and DDB. Interpublic is the parent company of top advertising agencies such as McCann, FCB, and Weber Shandwick. Omnicom and Interpublic are behind many well-known advertising campaigns, including L’Oreal’s “Because I’m Worth It”, Apple’s “Think Different”, and Mastercard’s “Priceless” marketing campaigns.

Many synergies are expected from the merger of these two global marketing communications and brand advertising leaders. It is estimated that the transaction will generate $750 million of annual cost synergies. Moreover, the combined company is expected to generate more than $3 billion in annual free cash flow.

Since both Omnicom and Interpublic are U.S.-based companies, the majority of revenues are generated from the U.S. market. However, they have been working to build their international presence.

The merger has received antitrust approval from the U.S. Federal Trade Commission (FTC) and the U.K. Competition and Markets Authority. The FTC’s approval is conditioned upon the companies promising not to collude on boycotting advertisements based on political or ideological viewpoints.

The merger agreement provides that a termination fee must be paid in the event that the merger transaction does not close by a certain date. If the transaction fails to close as a result of a material breach by Omnicom, Omnicom will be required to pay Interpublic a $676 million termination fee. If the transaction fails to close as a result of a material breach by Interpublic, Interpublic will be required to pay Omnicom a $439 million termination fee. The closing of the merger is conditioned upon receiving approval from Omnicom’s stockholders.

Pursuant to the terms of the merger agreement, each party has agreed to certain restrictions on engaging in competing merger proposal discussions or negotiations. These non-solicitation obligations are customary in merger situations involving peer companies.

The merger comes at a time when advertising and media companies are facing stiff competition from artificial intelligence (AI) tools. Generative AI and large language models (LLMs) are expected to reshape how traditional advertising and marketing companies provide services to clients. Companies such as Omnicom and Interpublic have been trying to integrate AI technologies into their business to boost efficiency and make data-driven personalized recommendations.