(73)Directive 2006/43/EC requires Member States to have in place an investigations and sanctions regime for statutory auditors and audit firms carrying out statutory audits. That Directive also requires Member States to organise an effective system of public oversight, and to ensure that regulatory arrangements for public oversight systems permit effective cooperation at Union level in respect of Member States’ oversight activities. Such requirements should be extended to statutory auditors and audit firms that conduct assurance of sustainability reporting in order to ensure the consistency of the investigations, sanctions and oversight frameworks set up for the auditor’s work in the statutory audit and the assurance of sustainability reporting.