GroupM is a U.S. based media investment group of the multinational Holding company WPP plc.

[3][4] GroupM's headquarters are located at 3 World Trade Center, in Lower Manhattan, and the company has subsidiaries in Asia, Australia, North America, and the Europe, Middle East and Africa (EMEA) region.

Businesses associated with GroupM include Essence Global, Mindshare, Wavemaker, as well as the defunct media agency Maxus.

[5][6] In 2015, GroupM began requiring all media partners to acquire anti-piracy certification from the Trustworthy Accountability Group.

[11] GroupM removed the classification in 2023, when Linda Yaccarino was named Twitter's chief executive officer (CEO) and the two companies collaborated on a brand safety project.

The company also partnered with Good-Loop to launch an initiative to reduce the environmental impact of advertising spending.

[17] The move "[set] a precedent" for the advertising industry, according to Digiday, and was an expansion of work by the company's team in the U.K., which maintained a list of approximately 6,000 domain names that were not MFAs.

[30] GroupM North America has approximately 6,000 employees and $17.6 billion in media investment billings in the U.S. and Canada, as of 2020–2022.