22 JUN 2021

Supplementary Announcement of dividend payment date of year 2020

MYTILINEOS S.A. (the “Company”), following relevant announcement of June 15th, 2021, announces that the Annual Regular General Meeting of the Shareholders of the Company, held on June 15th, 2021, resolved, among others, to distribute a dividend in the sum of 0.36 euros per share. The final dividend amount that will be paid out stands at 0.3779876510 euros per share, increased by the dividend corresponding to 6,799,895 own shares that will be held by the Company on June 24th, 2021 (ex-dividend date). The dividend is subject to a 5% withholding tax, in accordance with the applicable tax provisions (with the exception or differentiation of such withholding for shareholders falling under special provisions. Therefore, the net amount of dividend which will be paid to shareholders will be 0.3590882685 euros per share.

On June 24th, 2021 the Company’s shares will trade ex-dividend. The beneficiaries of the dividend are the shareholders registered in the records of the Dematerialised Securities System (DSS) on June 25th, 2021 (record date). Payment of the dividend will commence on July 1st, 2021.

Payment of the dividend shall be effected in accordance with the procedure stipulated in the Company’s relevant announcement of June 15th, 2021.

For additional clarifications or information, please contact the Company’s Investor Relations Department (Tel.: 210-6877300, fax 210-6877400).