Pentagram

"The world's largest independently owned design studio," Pentagram is owned and run equally by 25 partners - all of whom are leaders in the design industry. Their star-studded list of past and present partners includes names like Alan Fletcher, Bob Gill, Paula Scher and Michael Bierut.
Headquarters: London
Locations: Austin, Berlin, New York and San Francisco
Notable clients: Planned Parenthood, Rolls-Royce, Saks Fifth Avenue, Starbucks, The Guggenheim, United Airlines, Verizon, Walgreens, Warner Brothers, Windows.