Nearly a year after announcing the deal , Omnicom has officially closed its $13.5 billion acquisition of Interpublic Group, creating the world’s largest advertising and marketing holding company by revenue and billings.

Under the all-stock agreement, Omnicom shareholders will own 60.6% of the combined company’s stock, and IPG shareholders 39.4%. Combined, the companies posted an estimated $26 billion in annual revenue in 2024.

John Wren will remain chairman and CEO of the company, while Phil Angelastro stays on as evp and CFO, and former IPG CEO Philippe Krakowsky and Daryl Simm will serve as co-presidents and COOs.

“This is a defining moment for our company and our industry,” said John Wren, Chairman and CEO of Omnicom, in a statement. “With the completion of the deal, Omnicom is set

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