Decisions of the Extraordinary General Meeting held on August 29th, 2023

MYTILINEOS S.A.

General Commercial Registry No. 757001000

Decisions of the Extraordinary General Meeting held on August 29^th, 2023

MYTILINEOS S.A. (the “Company”) announces that on Tuesday, August 29^th, 2023 at 13.00, an Extraordinary General Meeting of shareholders of the Company was held at the registered offices of the Company. Shareholders representing 84,192,177 common registered shares and voting rights, i.e. 60.84% of the total 138,393,347 common registered shares participated (physically or remotely through teleconference or by way of exercising their voting right before the meeting)[1].

The General Meeting discussed and took the following decisions by majority on the items of the agenda:

• On the 1^st item of the agenda, the shareholders approved the supplement to the scope of the Company with new activities and the corresponding amendment of article 2 of the articles of association as presented for approval. Furthermore, the board of directors was authorized to implement this resolution.
• On the 2^nd item of the agenda, the shareholders approved the conversion of the Company from fixed-term to indefinite and the corresponding amendment of article 4 of the articles of association as presented for approval. Furthermore, the board of directors was authorized to implement this resolution.

The Company will announce and publish on its website www.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, 4,497,814 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