#18. UM
Headquarters: New York
Employees: 985

One employee described UM as having “the resources of a big company with the attitude of a small one,” and that sentiment seems present throughout the workforce at this media-agency group.

Many staff members cite “the people” as one of the best parts of working at this company, where learning opportunities from fellow co-workers and a great leadership team are important.

“People are collaborative, supportive and genuinely care about fellow co-workers,” said one employee. The company has an open-office concept to encourage collaboration and communication as well as private mommy rooms, “Zen Dens” and an extended winter holiday.

Click here for Ad Age’s Best Places to Work 2014