Omnicom Group completed its all-stock acquisition of The Interpublic Group of Companies (IPG) on November 26, 2025. The deal was announced in December 2024, and the companies said it created the largest advertising holding company by revenue.
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IPG shareholders received 0.344 Omnicom shares for each IPG share. Omnicom shareholders own about 60.6% of the combined company and IPG shareholders about 39.4%. The combined company trades as Omnicom on the New York Stock Exchange under the OMC ticker.
The deal was announced at about $13.5 billion. Because Omnicom’s share price fell, Campaign Asia reported the final value as $9 billion at closing. Reports vary on the figure, so check the company’s filings for the exact value.
Regulatory approvals
The US Federal Trade Commission closed its review with a consent order in June 2025. The European Commission cleared the deal on November 24, 2025, the last major approval.
What changed
Omnicom said the combined company had pro forma revenue of more than $25 billion. Reports said the company planned about $750 million in annual cost savings, and some agency brands were folded into others. Interpublic’s corporate entity was dissolved.
Editor’s note: an earlier version of this article reported the December 2024 talks as still in progress. It has been updated to report the completed deal.
Sources
- The Drum, Omnicom’s IPG takeover is finally complete (26 November 2025): https://www.thedrum.com/news/omnicom-s-ipg-takeover-is-finally-closed-what-do-we-know
- Storyboard18, Omnicom closes $13.5 billion IPG acquisition (27 November 2025): https://www.storyboard18.com/advertising/omnicom-closes-13-5-billion-ipg-acquisition-leadership-structure-to-be-unveiled-by-dec-1-84860.htm
- Campaign Asia, Omnicom-IPG merger nears completion: here’s the full timeline (November 2025): https://www.campaignasia.com/article/omnicomipg-merger-nears-completion-heres-the-full-timeline/506012
- Omnicom, PR Newswire release, Omnicom completes acquisition of Interpublic (26 November 2025): https://groundnews.lakegeneva.lib.wi.us/article/a-madison-avenue-makeover-omnicoms-9-billion-merger-with-ipg-is-complete_b16b6d