The Stagwell Group LLC is an marketing communications and investment advisory company. It was founded by Mark Penn, former Chief Insight Officer at Microsoft. They have invested in digital marketing services since the fall of 2015, particularly in advertising, research, data analytics, public relations. 
The firm raised $250 million in investment capital before they launched. It was reported that they may use it to leverage and make up to $750 million in acquisitions. 
In October 2015, the Stagwell Group made their first acquisition, buying SKD Knickerbocker (a public affairs consulting firm) for up to $75 million.  Later that year, they acquired the National Research Group, an entertainment research firm.