According to its Articles of Association, Posti Group Corporation has 1-3 auditors. The auditor must be an authorized public accountant or a firm of authorized public accountants certified by the Finnish Central Chamber of Commerce.

Posti Group Corporation's auditor is the authorized public accountancy firm PricewaterhouseCoopers Oy (PwC), with Authorized Public Accountant Mikko Nieminen as the principal auditor.