The company consists of five major networks: FCB, IPG Mediabrands, McCann Worldgroup, MullenLowe Group and Marketing Specialists, as well as several independent specialty agencies in the areas of public relations, sports marketing, talent representation and healthcare.

[6] In January 1961, McCann was renamed Interpublic Group (IPG) and created the first marketing services management holding company with McCann-Erickson as a subsidiary.

[9] In 2001, IPG acquired True North Communications, the holding company for Foote Cone & Belding.

[10][11] In 2003, IPG agreed to pay $115 million to settle class action lawsuits brought by its shareholders.

The shareholders had sued Interpublic after accounting irregularities led to restatements of financial results, causing the company's stock to fall.

[13] On September 15, 2005, IPG announced plans to restate earnings for fiscal 2000 through 2004, due to problems in accounting for revenue, acquisitions and lease expenses.

[16] In April 2007, IPG announced it had agreed to buy Reprise Media, a search engine marketing firm.

Daryl Simm and the IPG CEO Philippe Krakowsky will be chief operating officers and co-presidents at Omnicom.