The advertising industry’s biggest deal in decades closed in New York’s own backyard. Omnicom Group completed its acquisition of crosstown rival The Interpublic Group of Companies on November 26, 2025, merging two of Madison Avenue’s storied holding companies into the largest marketing-and-advertising operation in the world.

The deal

Omnicom completed the all-stock transaction after receiving all necessary regulatory approvals and satisfying the remaining closing conditions, the company said. The combination, first announced in late 2024, had to clear antitrust reviews in the United States and the European Union before it could close — a process the deal cleared in November 2025.

The merged company carries pro forma combined revenue in excess of $25 billion and continues to trade on the New York Stock Exchange under the ticker OMC. Both Omnicom and Interpublic were headquartered in New York, and the combined company remains New York-based — consolidating two of the city’s marquee corporate advertising names under a single roof.

Leadership

John Wren remains chairman and chief executive of the combined company. Phil Angelastro stays on as executive vice president and chief financial officer. In a sign of the integration’s structure, former Interpublic chief executive Philippe Krakowsky and longtime Omnicom executive Daryl Simm were named co-presidents and chief operating officers.

The strategic logic

The merger reflects a broader scramble for scale across the advertising-holding sector, where legacy agency networks are racing to compete with tech platforms, data brokers and AI-driven ad tools that have eroded the traditional agency’s role. Bigger combined buying power, deeper first-party data and shared technology investment are the strategic arguments for consolidation.

Omnicom said it is doubling its total cost-synergy target to $1.5 billion, including roughly $900 million expected in 2026, as it consolidates overlapping back-office, technology and administrative functions. Those synergies typically come with headcount reductions, a sensitive point in an industry concentrated in New York, where the two companies’ agency brands employ thousands across Manhattan.

A New York story

For New York City, the deal is a rare consolidation of two homegrown corporate heavyweights rather than a relocation or takeover by an out-of-town buyer — the combined company keeps its center of gravity in the city that has anchored the American advertising business since the Mad Men era. Still, the integration’s cost targets and the secular pressures bearing down on agencies leave open questions about the long-term shape of New York’s advertising workforce.

Verification

Frequently Asked Questions

When did Omnicom complete the Interpublic acquisition?
Omnicom completed its acquisition of The Interpublic Group of Companies on November 26, 2025, after receiving all necessary regulatory approvals and satisfying the deal's closing conditions.
How big is the combined company?
The merged company has pro forma combined revenue in excess of $25 billion, making it the world's largest marketing and advertising holding company. It is headquartered in New York and trades on the NYSE under the ticker OMC.
Who leads the combined company?
John Wren remains chairman and chief executive. Phil Angelastro stays on as EVP and CFO, while former Interpublic CEO Philippe Krakowsky and Omnicom's Daryl Simm serve as co-presidents and chief operating officers.
What are the cost savings?
Omnicom said it is doubling its total cost-synergy target to $1.5 billion, including roughly $900 million expected to be realized in 2026, as the combined firm consolidates back-office, technology and overhead functions.