Mytilineos S A : Decisions of the Extraordinary General Meeting held on March 27th, 2024

MYTILINEOS S.A.

General Commercial Registry No. 757001000

Decisions of the Extraordinary General Meeting held on March 27th, 2024

MYTILINEOS S.A. (the "Company") announces that on Wednesday, March 27th, 2024 at 13.00, an Extraordinary General Meeting of shareholders of the Company was held at the registered offices of the Company. Shareholders representing 81,332,312 common registered shares and voting rights, i.e. 58.92% of the total 138,049,966 common registered shares participated (physically or remotely through teleconference or by way of exercising their voting right before the meeting)1.

The Extraordinary General Meeting discussed and took decisions on the sole item of the agenda and more specifically approved to renew the approval and terms for acquisition of own shares for an additional twenty-four (24) months period, with maximum number of Company shares to be acquired (including the shares that the Company has already acquired and holds) a total of up to 14,289,116 (142,891,161 Χ 10%). The new purchases, up to completion of 10% of the Company's paid up share capital, will be effected within a price range between €0.97 (minimum price) and €50 (maximum price) per share. The own shares that the Company holds at any given time (including the own shares that the Company has already acquired and holds) are intended for any purpose and use permitted by and in compliance with the law (including, indicatively but without limitation, reduction of share capital and cancellation, or/and distribution to personnel or/and members of the management of the Company or/and of any affiliated company). Furthermore, the board of directors was authorized to implement the aforementioned resolution.

The Company will announce and publish on its websitewww.mytilineos.com separate announcement with the detailed results of the voting per decision in accordance with article 133 par. 2 of the law 4548/2018.

1 It shall be noted that, pursuant to paragraph 1 of article 50 of Law 4548/2018, 4,841,195 own shares of the Company out of total 142,891,161 shares are not calculated both for the purposes of quorum and the voting process