Advertising Big Deal Aftermath... Global Agency Stocks Lose 1.4 Trillion Won in One Day

Omnicom Group Inc., a leading advertising and marketing holding company, saw its shares plunge 5.09% on the New York Stock Exchange on the 11th, closing at $69.32. The one-day sell-off erased about $1.056 billion (roughly KRW 1.4 trillion) from its market capitalization, which now stands at approximately $21.8 billion (around KRW 28 trillion).

Since completing its $13.5 billion acquisition of Interpublic Group (IPG) in November 2025, Omnicom has formally launched a major PR-agency restructuring—integrating Porter Novelli into FleishmanHillard and folding Ketchum into Golin. Investors are now eyeing the full-year results due in February, which will test the impact of the IPG deal, anticipated integration synergies and the company’s AI strategy. One research firm forecasts earnings per share (EPS) of $2.65 and revenue of $4.51 billion, while consensus estimates place the average price target at about $92 and maintain a “hold” rating on the stock.

Headquartered in New York, Omnicom Group generates over $15 billion in annual revenue and, with the IPG acquisition, is on track to become the world’s largest marketing and sales organization—surpassing $25 billion in revenue. Leveraging its proprietary data and AI platform, Omni, the company is strengthening its integrated service offerings across media, commerce, precision marketing and public relations to capture a greater share of global brands’ advertising budgets.