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 Ad-Tech Companies Struggle to Sell Themselves to Wall Street Newly Public Firms Take a Pounding in the Market as Investors Try to Suss Out What Differentiates Them By Tim Peterson, Published on July 22, 2013 1 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.