Sustainability review Independent Practitioner’s Assurance Report To the Management of Outokumpu Oyj We have been engaged by the Management of Outokumpu Oyj (hereinafter also the Company) to perform a limited assurance engagement on selected sustainability disclosures for the reporting period 1 January to 31 December 2018, disclosed in Outokumpu Oyj's Sustainability Review 2018 and in Outokumpu Oyj's online sustainability tool.