Article 28, paragraph 1 ISA provides that insurance undertakings must mandate an audit company to audit the financial statements. According to article 70 ISA and article 78 ISA, article 28 ISA shall be applied mutatis mutandis to insurance groups and insurance conglomerates that have been placed under Swiss insurance supervision exercised by the Federal Office of Private Insurance FOPI. Only audit companies and auditors may be mandated to conduct audits that have received special authorization from FOPI as an independent auditor respectively auditors in charge.