AdRoll

AdRoll is a firm that helps companies market themselves and which boasts 89% millennial employees. “The company has a humorous and quirky bent: Its values are expressed as ‘spirit animals,’ such as a jellyfish (transparency), beaver (industriousness) and orangutan (fun),” according to Great Place to Work. “Employees get their orangutan on through trivia nights, weekly dinners and roller discos.” Read the Great Place to Work review.