You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract Grey Is Ad Age's 2014 Agency of the Year Shop's Client-Retention Rate Was 95%; Revenue Up 18.4%; Won 20 out of 22 Pitches By Jack Neff, Published on February 03, 2014 3 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Become a Member Already a member? Log in.