The core activity of the company "Erwin Koller Wirtschaftsprüfung & Wirtschaftsberatung" is the provision of services in the field of auditing and business consulting, particularly for financial institutions, non-financial sector companies, as well as retail chains, processing industries, hospitality, travel organizations, and service companies. The specific activities include: Auditing and business consulting, Auditing of banks, securities dealers, and pension funds, Regulatory support and IKS for the establishment, mergers, reorganizations, etc. of banks/securities dealers and pension funds, Expert auditing activities at the Revision Supervisory Authority (RAB), Recognized audit manager at the VSV Association of Swiss Asset Managers. The company thus offers a comprehensive range of services in the field of auditing and business consulting, with a focus on financial institutions and companies from various industries.