Graf Wolfgang zu Castell-Castell

Nassauische Sparkasse provides banking services. The firm provides private and Internet banking, online, traveler's cheque, savings accounts and loan services. Nassauische Sparkasse was founded on January 22, 1840 and is headquartered in Wiesbaden, Germany.

Deutsche Leasing AG provides leasing services for small and medium-sized companies. It specializes in hardware and software; machinery and equipment; used machinery; vehicle; commercial vehicles; and real estate leasing. It also offers factoring, asset management, as well as information technology sales, vendor, and dealer stock financing. The company is headquartered in Bad Homburg vor der Höhe, Germany.

Horváth & Partner GmbH provides management consulting services. It specializes in corporate performance management and performance optimization. The company was founded in 1981 and is headquartered in Stuttgart, Germany.

Part of Horváth 4G Beteiligungs GmbH, Horváth AG is a management consultancy firm based in Stuttgart, Germany. The German company specializes in corporate management and transformation, with a focus on pricing strategy, new technologies, and holistic CRM consulting. The company helps companies advance strategically, exploit growth potential, establish effective structures and processes, and optimize target group approach and measures. The company also supports companies in the transformation of their finance area, with a focus on digitization, agile organizational forms, and holistic data models. Michael Kieninger has been the CEO of the company since 2004.

Sinus GmbH & Co. Beteiligungs KG provides management services. The private company is based in Taunusstein, Germany. The CEO of the German company is Markus Hankammer.

Deutsche Gesellschaft für privatärztliche Abrechnung dgpar is an innovative privatärztliche Verrechnungsstelle for Ärzte & Heilberufe. The company is based in Wiesbaden, Germany. With 20 years of experience, they specialize in Privatliquidation, Finanzierung, and Ausfallschutz. The CEOs of the German company are Helmut Karrer and Markus Wolf.