HQIB acquires stake in Ergosign Group HQIB acquires stake in Ergosign Group - Investment holding of the Harald Quandt family acquires majority stake in Ergosign Group, the market leader for user experience design in the German-speaking region - Both founders and Managing Shareholders, Dr. Marcus Plach and Prof. Dr. Dieter Wallach, remain Co-shareholders and Managing Directors - Strategic partnership will support growth and internationalization Bad Homburg / Saarbruecken, January 28, 2021. As of January 2021, Harald Quandt Industriebeteiligungen GmbH ("HQIB") has acquired a majority stake in Ergosign Group, the market-leading digital agency with focus on user experience design in the German-speaking region. The two founders, Dr. Marcus Plach and Prof. Dr. Dieter Wallach, remain co-shareholders and Managing Directors of the